Merge branch 'compression-accept-encoding' into compression-interop

482 files changed, 8988 insertions, 3270 deletions

diff --git a/src/compiler/cpp_generator.cc b/src/compiler/cpp_generator.cc
index 75659947df..ea487bcd89 100644
--- a/src/compiler/cpp_generator.cc
+++ b/src/compiler/cpp_generator.cc
@@ -119,6 +119,7 @@ grpc::string GetHeaderIncludes(const grpc::protobuf::FileDescriptor *file,
       "#include <grpc++/async_unary_call.h>\n"
       "#include <grpc++/status.h>\n"
       "#include <grpc++/stream.h>\n"
+      "#include <grpc++/stub_options.h>\n"
       "\n"
       "namespace grpc {\n"
       "class CompletionQueue;\n"
@@ -574,8 +575,8 @@ void PrintHeaderService(grpc::protobuf::io::Printer *printer,
   printer->Print("};\n");
   printer->Print(
       "static std::unique_ptr<Stub> NewStub(const std::shared_ptr< "
-      "::grpc::ChannelInterface>& "
-      "channel);\n");
+      "::grpc::ChannelInterface>& channel, "
+      "const ::grpc::StubOptions& options = ::grpc::StubOptions());\n");
 
   printer->Print("\n");
 
@@ -966,7 +967,8 @@ void PrintSourceService(grpc::protobuf::io::Printer *printer,
   printer->Print(
       *vars,
       "std::unique_ptr< $ns$$Service$::Stub> $ns$$Service$::NewStub("
-      "const std::shared_ptr< ::grpc::ChannelInterface>& channel) {\n"
+      "const std::shared_ptr< ::grpc::ChannelInterface>& channel, "
+      "const ::grpc::StubOptions& options) {\n"
       "  std::unique_ptr< $ns$$Service$::Stub> stub(new "
       "$ns$$Service$::Stub(channel));\n"
       "  return stub;\n"
diff --git a/src/compiler/csharp_generator.cc b/src/compiler/csharp_generator.cc
index 64371047e0..9432bdda96 100644
--- a/src/compiler/csharp_generator.cc
+++ b/src/compiler/csharp_generator.cc
@@ -246,6 +246,8 @@ void GenerateStaticMethodField(Printer* out, const MethodDescriptor *method) {
   out->Indent();
   out->Print("$methodtype$,\n", "methodtype",
              GetCSharpMethodType(GetMethodType(method)));
+  out->Print("$servicenamefield$,\n", "servicenamefield",
+               GetServiceNameFieldName());
   out->Print("\"$methodname$\",\n", "methodname", method->name());
   out->Print("$requestmarshaller$,\n", "requestmarshaller",
              GetMarshallerFieldName(method->input_type()));
@@ -269,7 +271,14 @@ void GenerateClientInterface(Printer* out, const ServiceDescriptor *service) {
     if (method_type == METHODTYPE_NO_STREAMING) {
       // unary calls have an extra synchronous stub method
       out->Print(
-          "$response$ $methodname$($request$ request, Metadata headers = null, CancellationToken cancellationToken = default(CancellationToken));\n",
+          "$response$ $methodname$($request$ request, Metadata headers = null, DateTime? deadline = null, CancellationToken cancellationToken = default(CancellationToken));\n",
+          "methodname", method->name(), "request",
+          GetClassName(method->input_type()), "response",
+          GetClassName(method->output_type()));
+
+      // overload taking CallOptions as a param
+      out->Print(
+          "$response$ $methodname$($request$ request, CallOptions options);\n",
           "methodname", method->name(), "request",
           GetClassName(method->input_type()), "response",
           GetClassName(method->output_type()));
@@ -280,7 +289,14 @@ void GenerateClientInterface(Printer* out, const ServiceDescriptor *service) {
       method_name += "Async";  // prevent name clash with synchronous method.
     }
     out->Print(
-        "$returntype$ $methodname$($request_maybe$Metadata headers = null, CancellationToken cancellationToken = default(CancellationToken));\n",
+        "$returntype$ $methodname$($request_maybe$Metadata headers = null, DateTime? deadline = null, CancellationToken cancellationToken = default(CancellationToken));\n",
+        "methodname", method_name, "request_maybe",
+        GetMethodRequestParamMaybe(method), "returntype",
+        GetMethodReturnTypeClient(method));
+
+    // overload taking CallOptions as a param
+    out->Print(
+        "$returntype$ $methodname$($request_maybe$CallOptions options);\n",
         "methodname", method_name, "request_maybe",
         GetMethodRequestParamMaybe(method), "returntype",
         GetMethodReturnTypeClient(method));
@@ -298,11 +314,13 @@ void GenerateServerInterface(Printer* out, const ServiceDescriptor *service) {
   out->Indent();
   for (int i = 0; i < service->method_count(); i++) {
     const MethodDescriptor *method = service->method(i);
-    out->Print("$returntype$ $methodname$($request$$response_stream_maybe$, ServerCallContext context);\n",
-               "methodname", method->name(), "returntype",
-               GetMethodReturnTypeServer(method), "request",
-               GetMethodRequestParamServer(method), "response_stream_maybe",
-               GetMethodResponseStreamMaybe(method));
+    out->Print(
+        "$returntype$ $methodname$($request$$response_stream_maybe$, "
+        "ServerCallContext context);\n",
+        "methodname", method->name(), "returntype",
+        GetMethodReturnTypeServer(method), "request",
+        GetMethodRequestParamServer(method), "response_stream_maybe",
+        GetMethodResponseStreamMaybe(method));
   }
   out->Outdent();
   out->Print("}\n");
@@ -332,16 +350,29 @@ void GenerateClientStub(Printer* out, const ServiceDescriptor *service) {
     if (method_type == METHODTYPE_NO_STREAMING) {
       // unary calls have an extra synchronous stub method
       out->Print(
-          "public $response$ $methodname$($request$ request, Metadata headers = null, CancellationToken cancellationToken = default(CancellationToken))\n",
+          "public $response$ $methodname$($request$ request, Metadata headers = null, DateTime? deadline = null, CancellationToken cancellationToken = default(CancellationToken))\n",
           "methodname", method->name(), "request",
           GetClassName(method->input_type()), "response",
           GetClassName(method->output_type()));
       out->Print("{\n");
       out->Indent();
-      out->Print("var call = CreateCall($servicenamefield$, $methodfield$, headers);\n",
-                 "servicenamefield", GetServiceNameFieldName(), "methodfield",
-                 GetMethodFieldName(method));
-      out->Print("return Calls.BlockingUnaryCall(call, request, cancellationToken);\n");
+      out->Print("var call = CreateCall($methodfield$, new CallOptions(headers, deadline, cancellationToken));\n",
+                 "methodfield", GetMethodFieldName(method));
+      out->Print("return Calls.BlockingUnaryCall(call, request);\n");
+      out->Outdent();
+      out->Print("}\n");
+
+      // overload taking CallOptions as a param
+      out->Print(
+                "public $response$ $methodname$($request$ request, CallOptions options)\n",
+                "methodname", method->name(), "request",
+                GetClassName(method->input_type()), "response",
+                GetClassName(method->output_type()));
+      out->Print("{\n");
+      out->Indent();
+      out->Print("var call = CreateCall($methodfield$, options);\n",
+                 "methodfield", GetMethodFieldName(method));
+      out->Print("return Calls.BlockingUnaryCall(call, request);\n");
       out->Outdent();
       out->Print("}\n");
     }
@@ -351,32 +382,61 @@ void GenerateClientStub(Printer* out, const ServiceDescriptor *service) {
       method_name += "Async";  // prevent name clash with synchronous method.
     }
     out->Print(
-        "public $returntype$ $methodname$($request_maybe$Metadata headers = null, CancellationToken cancellationToken = default(CancellationToken))\n",
+        "public $returntype$ $methodname$($request_maybe$Metadata headers = null, DateTime? deadline = null, CancellationToken cancellationToken = default(CancellationToken))\n",
+        "methodname", method_name, "request_maybe",
+        GetMethodRequestParamMaybe(method), "returntype",
+        GetMethodReturnTypeClient(method));
+    out->Print("{\n");
+    out->Indent();
+    out->Print("var call = CreateCall($methodfield$, new CallOptions(headers, deadline, cancellationToken));\n",
+               "methodfield", GetMethodFieldName(method));
+    switch (GetMethodType(method)) {
+      case METHODTYPE_NO_STREAMING:
+        out->Print("return Calls.AsyncUnaryCall(call, request);\n");
+        break;
+      case METHODTYPE_CLIENT_STREAMING:
+        out->Print("return Calls.AsyncClientStreamingCall(call);\n");
+        break;
+      case METHODTYPE_SERVER_STREAMING:
+        out->Print(
+            "return Calls.AsyncServerStreamingCall(call, request);\n");
+        break;
+      case METHODTYPE_BIDI_STREAMING:
+        out->Print("return Calls.AsyncDuplexStreamingCall(call);\n");
+        break;
+      default:
+        GOOGLE_LOG(FATAL)<< "Can't get here.";
+    }
+    out->Outdent();
+    out->Print("}\n");
+
+    // overload taking CallOptions as a param
+    out->Print(
+        "public $returntype$ $methodname$($request_maybe$CallOptions options)\n",
         "methodname", method_name, "request_maybe",
         GetMethodRequestParamMaybe(method), "returntype",
         GetMethodReturnTypeClient(method));
     out->Print("{\n");
     out->Indent();
-    out->Print("var call = CreateCall($servicenamefield$, $methodfield$, headers);\n",
-               "servicenamefield", GetServiceNameFieldName(), "methodfield",
-               GetMethodFieldName(method));
+    out->Print("var call = CreateCall($methodfield$, options);\n",
+               "methodfield", GetMethodFieldName(method));
     switch (GetMethodType(method)) {
       case METHODTYPE_NO_STREAMING:
-        out->Print("return Calls.AsyncUnaryCall(call, request, cancellationToken);\n");
+        out->Print("return Calls.AsyncUnaryCall(call, request);\n");
         break;
       case METHODTYPE_CLIENT_STREAMING:
-        out->Print("return Calls.AsyncClientStreamingCall(call, cancellationToken);\n");
+        out->Print("return Calls.AsyncClientStreamingCall(call);\n");
         break;
       case METHODTYPE_SERVER_STREAMING:
         out->Print(
-            "return Calls.AsyncServerStreamingCall(call, request, cancellationToken);\n");
+            "return Calls.AsyncServerStreamingCall(call, request);\n");
         break;
       case METHODTYPE_BIDI_STREAMING:
-        out->Print("return Calls.AsyncDuplexStreamingCall(call, cancellationToken);\n");
+        out->Print("return Calls.AsyncDuplexStreamingCall(call);\n");
         break;
       default:
         GOOGLE_LOG(FATAL)<< "Can't get here.";
-      }
+    }
     out->Outdent();
     out->Print("}\n");
   }
diff --git a/src/compiler/generator_helpers.h b/src/compiler/generator_helpers.h
index 7bdaff1c9b..68b807b057 100644
--- a/src/compiler/generator_helpers.h
+++ b/src/compiler/generator_helpers.h
@@ -126,7 +126,13 @@ inline grpc::string LowerUnderscoreToUpperCamel(grpc::string str) {
 }
 
 inline grpc::string FileNameInUpperCamel(const grpc::protobuf::FileDescriptor *file) {
-  return LowerUnderscoreToUpperCamel(StripProto(file->name()));
+  std::vector<grpc::string> tokens = tokenize(StripProto(file->name()), "/");
+  grpc::string result = "";
+  for (unsigned int i = 0; i < tokens.size() - 1; i++) {
+    result += tokens[i] + "/";
+  }
+  result += LowerUnderscoreToUpperCamel(tokens.back());
+  return result;
 }
 
 enum MethodType {
diff --git a/src/compiler/python_generator.cc b/src/compiler/python_generator.cc
index 724b69c703..2982a89fad 100644
--- a/src/compiler/python_generator.cc
+++ b/src/compiler/python_generator.cc
@@ -249,7 +249,7 @@ bool GetModuleAndMessagePath(const Descriptor* type,
   do {
     message_path.push_back(path_elem_type);
     path_elem_type = path_elem_type->containing_type();
-  } while (path_elem_type != nullptr);
+  } while (path_elem_type); // implicit nullptr comparison; don't be explicit
   grpc::string file_name = type->file()->name();
   static const int proto_suffix_length = strlen(".proto");
   if (!(file_name.size() > static_cast<size_t>(proto_suffix_length) &&
diff --git a/src/core/census/grpc_context.c b/src/core/census/grpc_context.c
index 0ed63469b6..11f1eb3d5d 100644
--- a/src/core/census/grpc_context.c
+++ b/src/core/census/grpc_context.c
@@ -32,14 +32,15 @@
  */
 
 #include <grpc/census.h>
-#include "src/core/census/grpc_context.h"
+#include <grpc/grpc.h>
+#include "src/core/surface/call.h"
 
 static void grpc_census_context_destroy(void *context) {
   census_context_destroy((census_context *)context);
 }
 
 void grpc_census_call_set_context(grpc_call *call, census_context *context) {
-  if (!census_available()) {
+  if (census_enabled() == CENSUS_FEATURE_NONE) {
     return;
   }
   if (context == NULL) {
diff --git a/src/core/census/initialize.c b/src/core/census/initialize.c
index 8016520641..8d60f790eb 100644
--- a/src/core/census/initialize.c
+++ b/src/core/census/initialize.c
@@ -33,20 +33,25 @@
 
 #include <grpc/census.h>
 
-static int census_fns_enabled = CENSUS_NONE;
+static int features_enabled = CENSUS_FEATURE_NONE;
 
-int census_initialize(int functions) {
-  if (census_fns_enabled != CENSUS_NONE) {
+int census_initialize(int features) {
+  if (features_enabled != CENSUS_FEATURE_NONE) {
     return 1;
   }
-  if (functions != CENSUS_NONE) {
+  if (features != CENSUS_FEATURE_NONE) {
     return 1;
   } else {
-    census_fns_enabled = functions;
+    features_enabled = features;
     return 0;
   }
 }
 
-void census_shutdown() { census_fns_enabled = CENSUS_NONE; }
+void census_shutdown(void) { features_enabled = CENSUS_FEATURE_NONE; }
 
-int census_available() { return (census_fns_enabled != CENSUS_NONE); }
+int census_supported(void) {
+  /* TODO(aveitch): improve this as we implement features... */
+  return CENSUS_FEATURE_NONE;
+}
+
+int census_enabled(void) { return features_enabled; }
diff --git a/src/core/census/grpc_context.h b/src/core/census/record_stat.c
index 4637e7218e..3dd918618b 100644
--- a/src/core/census/grpc_context.h
+++ b/src/core/census/record_stat.c
@@ -31,27 +31,8 @@
  *
  */
 
-/* GRPC <--> CENSUS context interface */
-
-#ifndef CENSUS_GRPC_CONTEXT_H
-#define CENSUS_GRPC_CONTEXT_H
-
 #include <grpc/census.h>
-#include "src/core/surface/call.h"
-
-#ifdef __cplusplus
-extern "C" {
-#endif
-
-/* Set census context for the call; Must be called before first call to
-   grpc_call_start_batch(). */
-void grpc_census_call_set_context(grpc_call *call, census_context *context);
-
-/* Retrieve the calls current census context. */
-census_context *grpc_census_call_get_context(grpc_call *call);
-
-#ifdef __cplusplus
-}
-#endif
+#include "src/core/census/rpc_stat_id.h"
 
-#endif /* CENSUS_GRPC_CONTEXT_H */
+void census_record_stat(census_context *context, census_stat *stats,
+                        size_t nstats) {}
diff --git a/src/core/census/rpc_stat_id.h b/src/core/census/rpc_stat_id.h
new file mode 100644
index 0000000000..fc0aa6f43f
--- /dev/null
+++ b/src/core/census/rpc_stat_id.h
@@ -0,0 +1,46 @@
+/*
+ *
+ * Copyright 2015, Google Inc.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *
+ *     * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above
+ * copyright notice, this list of conditions and the following disclaimer
+ * in the documentation and/or other materials provided with the
+ * distribution.
+ *     * Neither the name of Google Inc. nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ */
+
+#ifndef CENSUS_RPC_STAT_ID_H
+#define CENSUS_RPC_STAT_ID_H
+
+/* Stats ID's used for RPC measurements. */
+#define CENSUS_INVALID_STAT_ID 0     /* ID 0 is always invalid */
+#define CENSUS_RPC_CLIENT_REQUESTS 1 /* Count of client requests sent. */
+#define CENSUS_RPC_SERVER_REQUESTS 2 /* Count of server requests sent. */
+#define CENSUS_RPC_CLIENT_ERRORS 3   /* Client error counts. */
+#define CENSUS_RPC_SERVER_ERRORS 4   /* Server error counts. */
+#define CENSUS_RPC_CLIENT_LATENCY 5  /* Client side request latency. */
+#define CENSUS_RPC_SERVER_LATENCY 6  /* Server side request latency. */
+
+#endif /* CENSUS_RPC_STAT_ID_H */
diff --git a/src/core/channel/channel_stack.c b/src/core/channel/channel_stack.c
index e38dcb58b7..cd7c182ef2 100644
--- a/src/core/channel/channel_stack.c
+++ b/src/core/channel/channel_stack.c
@@ -191,6 +191,11 @@ void grpc_call_next_op(grpc_call_element *elem, grpc_transport_stream_op *op) {
   next_elem->filter->start_transport_stream_op(next_elem, op);
 }
 
+char *grpc_call_next_get_peer(grpc_call_element *elem) {
+  grpc_call_element *next_elem = elem + 1;
+  return next_elem->filter->get_peer(next_elem);
+}
+
 void grpc_channel_next_op(grpc_channel_element *elem, grpc_transport_op *op) {
   grpc_channel_element *next_elem = elem + 1;
   next_elem->filter->start_transport_op(next_elem, op);
diff --git a/src/core/channel/channel_stack.h b/src/core/channel/channel_stack.h
index 785be8925b..4a608b956e 100644
--- a/src/core/channel/channel_stack.h
+++ b/src/core/channel/channel_stack.h
@@ -104,6 +104,9 @@ typedef struct {
      The filter does not need to do any chaining */
   void (*destroy_channel_elem)(grpc_channel_element *elem);
 
+  /* Implement grpc_call_get_peer() */
+  char *(*get_peer)(grpc_call_element *elem);
+
   /* The name of this filter */
   const char *name;
 } grpc_channel_filter;
@@ -173,6 +176,8 @@ void grpc_call_next_op(grpc_call_element *elem, grpc_transport_stream_op *op);
 /* Call the next operation (depending on call directionality) in a channel
    stack */
 void grpc_channel_next_op(grpc_channel_element *elem, grpc_transport_op *op);
+/* Pass through a request to get_peer to the next child element */
+char *grpc_call_next_get_peer(grpc_call_element *elem);
 
 /* Given the top element of a channel stack, get the channel stack itself */
 grpc_channel_stack *grpc_channel_stack_from_top_element(
diff --git a/src/core/channel/client_channel.c b/src/core/channel/client_channel.c
index c1aa580b2d..a293c93ec6 100644
--- a/src/core/channel/client_channel.c
+++ b/src/core/channel/client_channel.c
@@ -40,7 +40,6 @@
 #include "src/core/channel/connected_channel.h"
 #include "src/core/surface/channel.h"
 #include "src/core/iomgr/iomgr.h"
-#include "src/core/iomgr/pollset_set.h"
 #include "src/core/support/string.h"
 #include "src/core/transport/connectivity_state.h"
 #include <grpc/support/alloc.h>
@@ -57,6 +56,8 @@ typedef struct {
   grpc_mdctx *mdctx;
   /** resolver for this channel */
   grpc_resolver *resolver;
+  /** have we started resolving this channel */
+  int started_resolving;
   /** master channel - the grpc_channel instance that ultimately owns
       this channel_data via its channel stack.
       We occasionally use this to bump the refcount on the master channel
@@ -77,8 +78,22 @@ typedef struct {
   grpc_iomgr_closure on_config_changed;
   /** connectivity state being tracked */
   grpc_connectivity_state_tracker state_tracker;
+  /** when an lb_policy arrives, should we try to exit idle */
+  int exit_idle_when_lb_policy_arrives;
+  /** pollset_set of interested parties in a new connection */
+  grpc_pollset_set pollset_set;
 } channel_data;
 
+/** We create one watcher for each new lb_policy that is returned from a resolver,
+    to watch for state changes from the lb_policy. When a state change is seen, we
+    update the channel, and create a new watcher */
+typedef struct {
+  channel_data *chand;
+  grpc_iomgr_closure on_changed;
+  grpc_connectivity_state state;
+  grpc_lb_policy *lb_policy;
+} lb_policy_connectivity_watcher;
+
 typedef enum {
   CALL_CREATED,
   CALL_WAITING_FOR_SEND,
@@ -265,6 +280,26 @@ static grpc_iomgr_closure *merge_into_waiting_op(
   return consumed_op;
 }
 
+static char *cc_get_peer(grpc_call_element *elem) {
+  call_data *calld = elem->call_data;
+  channel_data *chand = elem->channel_data;
+  grpc_subchannel_call *subchannel_call;
+  char *result;
+
+  gpr_mu_lock(&calld->mu_state);
+  if (calld->state == CALL_ACTIVE) {
+    subchannel_call = calld->subchannel_call;
+    GRPC_SUBCHANNEL_CALL_REF(subchannel_call, "get_peer");
+    gpr_mu_unlock(&calld->mu_state);
+    result = grpc_subchannel_call_get_peer(subchannel_call);
+    GRPC_SUBCHANNEL_CALL_UNREF(subchannel_call, "get_peer");
+    return result;
+  } else {
+    gpr_mu_unlock(&calld->mu_state);
+    return grpc_channel_get_target(chand->master);
+  }
+}
+
 static void perform_transport_stream_op(grpc_call_element *elem,
                                         grpc_transport_stream_op *op,
                                         int continuation) {
@@ -365,6 +400,13 @@ static void perform_transport_stream_op(grpc_call_element *elem,
           } else if (chand->resolver != NULL) {
             calld->state = CALL_WAITING_FOR_CONFIG;
             add_to_lb_policy_wait_queue_locked_state_config(elem);
+            if (!chand->started_resolving && chand->resolver != NULL) {
+              GRPC_CHANNEL_INTERNAL_REF(chand->master, "resolver");
+              chand->started_resolving = 1;
+              grpc_resolver_next(chand->resolver,
+                                 &chand->incoming_configuration,
+                                 &chand->on_config_changed);
+            }
             gpr_mu_unlock(&chand->mu_config);
             gpr_mu_unlock(&calld->mu_state);
           } else {
@@ -388,16 +430,53 @@ static void cc_start_transport_stream_op(grpc_call_element *elem,
   perform_transport_stream_op(elem, op, 0);
 }
 
+static void watch_lb_policy(channel_data *chand, grpc_lb_policy *lb_policy, grpc_connectivity_state current_state);
+
+static void on_lb_policy_state_changed(void *arg, int iomgr_success) {
+  lb_policy_connectivity_watcher *w = arg;
+
+  gpr_mu_lock(&w->chand->mu_config);
+  /* check if the notification is for a stale policy */
+  if (w->lb_policy == w->chand->lb_policy) {
+    grpc_connectivity_state_set(&w->chand->state_tracker, w->state,
+                                "lb_changed");
+    if (w->state != GRPC_CHANNEL_FATAL_FAILURE) {
+      watch_lb_policy(w->chand, w->lb_policy, w->state);
+    }
+  }
+  gpr_mu_unlock(&w->chand->mu_config);
+
+  GRPC_CHANNEL_INTERNAL_UNREF(w->chand->master, "watch_lb_policy");
+  gpr_free(w);
+}
+
+static void watch_lb_policy(channel_data *chand, grpc_lb_policy *lb_policy, grpc_connectivity_state current_state) {
+  lb_policy_connectivity_watcher *w = gpr_malloc(sizeof(*w));
+  GRPC_CHANNEL_INTERNAL_REF(chand->master, "watch_lb_policy");
+
+  w->chand = chand;
+  grpc_iomgr_closure_init(&w->on_changed, on_lb_policy_state_changed, w);
+  w->state = current_state;
+  w->lb_policy = lb_policy;
+  grpc_lb_policy_notify_on_state_change(lb_policy, &w->state, &w->on_changed);
+}
+
 static void cc_on_config_changed(void *arg, int iomgr_success) {
   channel_data *chand = arg;
   grpc_lb_policy *lb_policy = NULL;
   grpc_lb_policy *old_lb_policy;
   grpc_resolver *old_resolver;
   grpc_iomgr_closure *wakeup_closures = NULL;
+  grpc_connectivity_state state = GRPC_CHANNEL_TRANSIENT_FAILURE;
+  int exit_idle = 0;
 
   if (chand->incoming_configuration != NULL) {
     lb_policy = grpc_client_config_get_lb_policy(chand->incoming_configuration);
-    GRPC_LB_POLICY_REF(lb_policy, "channel");
+    if (lb_policy != NULL) {
+      GRPC_LB_POLICY_REF(lb_policy, "channel");
+      GRPC_LB_POLICY_REF(lb_policy, "config_change");
+      state = grpc_lb_policy_check_connectivity(lb_policy);
+    }
 
     grpc_client_config_unref(chand->incoming_configuration);
   }
@@ -411,13 +490,12 @@ static void cc_on_config_changed(void *arg, int iomgr_success) {
     wakeup_closures = chand->waiting_for_config_closures;
     chand->waiting_for_config_closures = NULL;
   }
-  gpr_mu_unlock(&chand->mu_config);
-
-  if (old_lb_policy) {
-    GRPC_LB_POLICY_UNREF(old_lb_policy, "channel");
+  if (lb_policy != NULL && chand->exit_idle_when_lb_policy_arrives) {
+    GRPC_LB_POLICY_REF(lb_policy, "exit_idle");
+    exit_idle = 1;
+    chand->exit_idle_when_lb_policy_arrives = 0;
   }
 
-  gpr_mu_lock(&chand->mu_config);
   if (iomgr_success && chand->resolver) {
     grpc_resolver *resolver = chand->resolver;
     GRPC_RESOLVER_REF(resolver, "channel-next");
@@ -426,11 +504,16 @@ static void cc_on_config_changed(void *arg, int iomgr_success) {
     grpc_resolver_next(resolver, &chand->incoming_configuration,
                        &chand->on_config_changed);
     GRPC_RESOLVER_UNREF(resolver, "channel-next");
+    grpc_connectivity_state_set(&chand->state_tracker, state,
+                                "new_lb+resolver");
+    if (lb_policy != NULL) {
+      watch_lb_policy(chand, lb_policy, state);
+    }
   } else {
     old_resolver = chand->resolver;
     chand->resolver = NULL;
     grpc_connectivity_state_set(&chand->state_tracker,
-                                GRPC_CHANNEL_FATAL_FAILURE);
+                                GRPC_CHANNEL_FATAL_FAILURE, "resolver_gone");
     gpr_mu_unlock(&chand->mu_config);
     if (old_resolver != NULL) {
       grpc_resolver_shutdown(old_resolver);
@@ -438,12 +521,24 @@ static void cc_on_config_changed(void *arg, int iomgr_success) {
     }
   }
 
+  if (exit_idle) {
+    grpc_lb_policy_exit_idle(lb_policy);
+    GRPC_LB_POLICY_UNREF(lb_policy, "exit_idle");
+  }
+
+  if (old_lb_policy != NULL) {
+    GRPC_LB_POLICY_UNREF(old_lb_policy, "channel");
+  }
+
   while (wakeup_closures) {
     grpc_iomgr_closure *next = wakeup_closures->next;
-    grpc_iomgr_add_callback(wakeup_closures);
+    wakeup_closures->cb(wakeup_closures->cb_arg, 1);
     wakeup_closures = next;
   }
 
+  if (lb_policy != NULL) {
+    GRPC_LB_POLICY_UNREF(lb_policy, "config_change");
+  }
   GRPC_CHANNEL_INTERNAL_UNREF(chand->master, "resolver");
 }
 
@@ -467,20 +562,22 @@ static void cc_start_transport_op(grpc_channel_element *elem,
     op->connectivity_state = NULL;
   }
 
+  if (!is_empty(op, sizeof(*op))) {
+    lb_policy = chand->lb_policy;
+    if (lb_policy) {
+      GRPC_LB_POLICY_REF(lb_policy, "broadcast");
+    }
+  }
+
   if (op->disconnect && chand->resolver != NULL) {
     grpc_connectivity_state_set(&chand->state_tracker,
-                                GRPC_CHANNEL_FATAL_FAILURE);
+                                GRPC_CHANNEL_FATAL_FAILURE, "disconnect");
     destroy_resolver = chand->resolver;
     chand->resolver = NULL;
     if (chand->lb_policy != NULL) {
       grpc_lb_policy_shutdown(chand->lb_policy);
-    }
-  }
-
-  if (!is_empty(op, sizeof(*op))) {
-    lb_policy = chand->lb_policy;
-    if (lb_policy) {
-      GRPC_LB_POLICY_REF(lb_policy, "broadcast");
+      GRPC_LB_POLICY_UNREF(chand->lb_policy, "channel");
+      chand->lb_policy = NULL;
     }
   }
   gpr_mu_unlock(&chand->mu_config);
@@ -561,10 +658,11 @@ static void init_channel_elem(grpc_channel_element *elem, grpc_channel *master,
   gpr_mu_init(&chand->mu_config);
   chand->mdctx = metadata_context;
   chand->master = master;
+  grpc_pollset_set_init(&chand->pollset_set);
   grpc_iomgr_closure_init(&chand->on_config_changed, cc_on_config_changed,
                           chand);
 
-  grpc_connectivity_state_init(&chand->state_tracker, GRPC_CHANNEL_IDLE);
+  grpc_connectivity_state_init(&chand->state_tracker, GRPC_CHANNEL_IDLE, "client_channel");
 }
 
 /* Destructor for channel_data */
@@ -578,6 +676,8 @@ static void destroy_channel_elem(grpc_channel_element *elem) {
   if (chand->lb_policy != NULL) {
     GRPC_LB_POLICY_UNREF(chand->lb_policy, "channel");
   }
+  grpc_connectivity_state_destroy(&chand->state_tracker);
+  grpc_pollset_set_destroy(&chand->pollset_set);
   gpr_mu_destroy(&chand->mu_config);
 }
 
@@ -590,6 +690,7 @@ const grpc_channel_filter grpc_client_channel_filter = {
     sizeof(channel_data),
     init_channel_elem,
     destroy_channel_elem,
+    cc_get_peer,
     "client-channel",
 };
 
@@ -598,10 +699,66 @@ void grpc_client_channel_set_resolver(grpc_channel_stack *channel_stack,
   /* post construction initialization: set the transport setup pointer */
   grpc_channel_element *elem = grpc_channel_stack_last_element(channel_stack);
   channel_data *chand = elem->channel_data;
+  gpr_mu_lock(&chand->mu_config);
   GPR_ASSERT(!chand->resolver);
   chand->resolver = resolver;
-  GRPC_CHANNEL_INTERNAL_REF(chand->master, "resolver");
   GRPC_RESOLVER_REF(resolver, "channel");
-  grpc_resolver_next(resolver, &chand->incoming_configuration,
-                     &chand->on_config_changed);
+  if (chand->waiting_for_config_closures != NULL ||
+      chand->exit_idle_when_lb_policy_arrives) {
+    chand->started_resolving = 1;
+    GRPC_CHANNEL_INTERNAL_REF(chand->master, "resolver");
+    grpc_resolver_next(resolver, &chand->incoming_configuration,
+                       &chand->on_config_changed);
+  }
+  gpr_mu_unlock(&chand->mu_config);
+}
+
+grpc_connectivity_state grpc_client_channel_check_connectivity_state(
+    grpc_channel_element *elem, int try_to_connect) {
+  channel_data *chand = elem->channel_data;
+  grpc_connectivity_state out;
+  gpr_mu_lock(&chand->mu_config);
+  out = grpc_connectivity_state_check(&chand->state_tracker);
+  if (out == GRPC_CHANNEL_IDLE && try_to_connect) {
+    if (chand->lb_policy != NULL) {
+      grpc_lb_policy_exit_idle(chand->lb_policy);
+    } else {
+      chand->exit_idle_when_lb_policy_arrives = 1;
+      if (!chand->started_resolving && chand->resolver != NULL) {
+        GRPC_CHANNEL_INTERNAL_REF(chand->master, "resolver");
+        chand->started_resolving = 1;
+        grpc_resolver_next(chand->resolver, &chand->incoming_configuration,
+                           &chand->on_config_changed);
+      }
+    }
+  }
+  gpr_mu_unlock(&chand->mu_config);
+  return out;
+}
+
+void grpc_client_channel_watch_connectivity_state(
+    grpc_channel_element *elem, grpc_connectivity_state *state,
+    grpc_iomgr_closure *on_complete) {
+  channel_data *chand = elem->channel_data;
+  gpr_mu_lock(&chand->mu_config);
+  grpc_connectivity_state_notify_on_state_change(&chand->state_tracker, state,
+                                                 on_complete);
+  gpr_mu_unlock(&chand->mu_config);
+}
+
+grpc_pollset_set *grpc_client_channel_get_connecting_pollset_set(grpc_channel_element *elem) {
+  channel_data *chand = elem->channel_data;
+  return &chand->pollset_set;
+}
+
+void grpc_client_channel_add_interested_party(grpc_channel_element *elem,
+                                          grpc_pollset *pollset) {
+  channel_data *chand = elem->channel_data;
+  grpc_pollset_set_add_pollset(&chand->pollset_set, pollset);
+}
+
+void grpc_client_channel_del_interested_party(grpc_channel_element *elem,
+                                          grpc_pollset *pollset) {
+  channel_data *chand = elem->channel_data;
+  grpc_pollset_set_del_pollset(&chand->pollset_set, pollset);
 }
diff --git a/src/core/channel/client_channel.h b/src/core/channel/client_channel.h
index fd2be46145..cd81294eb3 100644
--- a/src/core/channel/client_channel.h
+++ b/src/core/channel/client_channel.h
@@ -52,4 +52,18 @@ extern const grpc_channel_filter grpc_client_channel_filter;
 void grpc_client_channel_set_resolver(grpc_channel_stack *channel_stack,
                                       grpc_resolver *resolver);
 
+grpc_connectivity_state grpc_client_channel_check_connectivity_state(
+    grpc_channel_element *elem, int try_to_connect);
+
+void grpc_client_channel_watch_connectivity_state(
+    grpc_channel_element *elem, grpc_connectivity_state *state,
+    grpc_iomgr_closure *on_complete);
+
+grpc_pollset_set *grpc_client_channel_get_connecting_pollset_set(grpc_channel_element *elem);
+
+void grpc_client_channel_add_interested_party(grpc_channel_element *channel,
+                                          grpc_pollset *pollset);
+void grpc_client_channel_del_interested_party(grpc_channel_element *channel,
+                                          grpc_pollset *pollset);
+
 #endif /* GRPC_INTERNAL_CORE_CHANNEL_CLIENT_CHANNEL_H */
diff --git a/src/core/channel/compress_filter.c b/src/core/channel/compress_filter.c
index 1bd20661d6..2fd4c8cae6 100644
--- a/src/core/channel/compress_filter.c
+++ b/src/core/channel/compress_filter.c
@@ -301,24 +301,24 @@ static void init_channel_elem(grpc_channel_element *elem, grpc_channel *master,
       grpc_channel_args_get_compression_algorithm(args);
 
   channeld->mdstr_request_compression_algorithm_key =
-      grpc_mdstr_from_string(mdctx, GRPC_COMPRESS_REQUEST_ALGORITHM_KEY);
+      grpc_mdstr_from_string(mdctx, GRPC_COMPRESS_REQUEST_ALGORITHM_KEY, 0);
 
   channeld->mdstr_outgoing_compression_algorithm_key =
-      grpc_mdstr_from_string(mdctx, "grpc-encoding");
+      grpc_mdstr_from_string(mdctx, "grpc-encoding", 0);
 
   channeld->mdstr_compression_capabilities_key =
-      grpc_mdstr_from_string(mdctx, "grpc-accept-encoding");
+      grpc_mdstr_from_string(mdctx, "grpc-accept-encoding", 0);
 
   for (algo_idx = 0; algo_idx < GRPC_COMPRESS_ALGORITHMS_COUNT; ++algo_idx) {
-    char *algorith_name;
-    GPR_ASSERT(grpc_compression_algorithm_name(algo_idx, &algorith_name) != 0);
+    char *algorithm_name;
+    GPR_ASSERT(grpc_compression_algorithm_name(algo_idx, &algorithm_name) != 0);
     channeld->mdelem_compression_algorithms[algo_idx] =
         grpc_mdelem_from_metadata_strings(
             mdctx,
             GRPC_MDSTR_REF(channeld->mdstr_outgoing_compression_algorithm_key),
-            grpc_mdstr_from_string(mdctx, algorith_name));
+            grpc_mdstr_from_string(mdctx, algorithm_name, 0));
     if (algo_idx > 0) {
-      supported_algorithms_names[algo_idx-1] = algorith_name;
+      supported_algorithms_names[algo_idx-1] = algorithm_name;
     }
   }
 
@@ -334,7 +334,7 @@ static void init_channel_elem(grpc_channel_element *elem, grpc_channel *master,
       grpc_mdelem_from_metadata_strings(
           mdctx,
           GRPC_MDSTR_REF(channeld->mdstr_compression_capabilities_key),
-          grpc_mdstr_from_string(mdctx, accept_encoding_str));
+          grpc_mdstr_from_string(mdctx, accept_encoding_str, 0));
   gpr_free(accept_encoding_str);
 
   GPR_ASSERT(!is_last);
@@ -364,4 +364,5 @@ const grpc_channel_filter grpc_compress_filter = {
     sizeof(channel_data),
     init_channel_elem,
     destroy_channel_elem,
+    grpc_call_next_get_peer,
     "compress"};
diff --git a/src/core/channel/connected_channel.c b/src/core/channel/connected_channel.c
index 34d07de519..b95ed06f2b 100644
--- a/src/core/channel/connected_channel.c
+++ b/src/core/channel/connected_channel.c
@@ -119,6 +119,11 @@ static void destroy_channel_elem(grpc_channel_element *elem) {
   grpc_transport_destroy(cd->transport);
 }
 
+static char *con_get_peer(grpc_call_element *elem) {
+  channel_data *chand = elem->channel_data;
+  return grpc_transport_get_peer(chand->transport);
+}
+
 const grpc_channel_filter grpc_connected_channel_filter = {
     con_start_transport_stream_op,
     con_start_transport_op,
@@ -128,6 +133,7 @@ const grpc_channel_filter grpc_connected_channel_filter = {
     sizeof(channel_data),
     init_channel_elem,
     destroy_channel_elem,
+    con_get_peer,
     "connected",
 };
 
diff --git a/src/core/channel/http_client_filter.c b/src/core/channel/http_client_filter.c
index 6e93103a6a..48c623d359 100644
--- a/src/core/channel/http_client_filter.c
+++ b/src/core/channel/http_client_filter.c
@@ -40,10 +40,12 @@
 typedef struct call_data {
   grpc_linked_mdelem method;
   grpc_linked_mdelem scheme;
+  grpc_linked_mdelem authority;
   grpc_linked_mdelem te_trailers;
   grpc_linked_mdelem content_type;
   grpc_linked_mdelem user_agent;
   int sent_initial_metadata;
+  int sent_authority;
 
   int got_initial_metadata;
   grpc_stream_op_buffer *recv_ops;
@@ -62,6 +64,7 @@ typedef struct channel_data {
   grpc_mdelem *scheme;
   grpc_mdelem *content_type;
   grpc_mdelem *status;
+  grpc_mdelem *default_authority;
   /** complete user agent mdelem */
   grpc_mdelem *user_agent;
 } channel_data;
@@ -100,6 +103,7 @@ static void hc_on_recv(void *user_data, int success) {
 
 static grpc_mdelem *client_strip_filter(void *user_data, grpc_mdelem *md) {
   grpc_call_element *elem = user_data;
+  call_data *calld = elem->call_data;
   channel_data *channeld = elem->channel_data;
   /* eat the things we'd like to set ourselves */
   if (md->key == channeld->method->key) return NULL;
@@ -107,6 +111,10 @@ static grpc_mdelem *client_strip_filter(void *user_data, grpc_mdelem *md) {
   if (md->key == channeld->te_trailers->key) return NULL;
   if (md->key == channeld->content_type->key) return NULL;
   if (md->key == channeld->user_agent->key) return NULL;
+  if (channeld->default_authority &&
+      channeld->default_authority->key == md->key) {
+    calld->sent_authority = 1;
+  }
   return md;
 }
 
@@ -130,6 +138,11 @@ static void hc_mutate_op(grpc_call_element *elem,
                                    GRPC_MDELEM_REF(channeld->method));
       grpc_metadata_batch_add_head(&op->data.metadata, &calld->scheme,
                                    GRPC_MDELEM_REF(channeld->scheme));
+      if (channeld->default_authority && !calld->sent_authority) {
+        grpc_metadata_batch_add_head(
+            &op->data.metadata, &calld->authority,
+            GRPC_MDELEM_REF(channeld->default_authority));
+      }
       grpc_metadata_batch_add_tail(&op->data.metadata, &calld->te_trailers,
                                    GRPC_MDELEM_REF(channeld->te_trailers));
       grpc_metadata_batch_add_tail(&op->data.metadata, &calld->content_type,
@@ -162,6 +175,7 @@ static void init_call_elem(grpc_call_element *elem,
   call_data *calld = elem->call_data;
   calld->sent_initial_metadata = 0;
   calld->got_initial_metadata = 0;
+  calld->sent_authority = 0;
   calld->on_done_recv = NULL;
   grpc_iomgr_closure_init(&calld->hc_on_recv, hc_on_recv, elem);
   if (initial_op) hc_mutate_op(elem, initial_op);
@@ -233,7 +247,7 @@ static grpc_mdstr *user_agent_from_args(grpc_mdctx *mdctx,
 
   tmp = gpr_strvec_flatten(&v, NULL);
   gpr_strvec_destroy(&v);
-  result = grpc_mdstr_from_string(mdctx, tmp);
+  result = grpc_mdstr_from_string(mdctx, tmp, 0);
   gpr_free(tmp);
 
   return result;
@@ -241,8 +255,10 @@ static grpc_mdstr *user_agent_from_args(grpc_mdctx *mdctx,
 
 /* Constructor for channel_data */
 static void init_channel_elem(grpc_channel_element *elem, grpc_channel *master,
-                              const grpc_channel_args *args, grpc_mdctx *mdctx,
-                              int is_first, int is_last) {
+                              const grpc_channel_args *channel_args,
+                              grpc_mdctx *mdctx, int is_first, int is_last) {
+  size_t i;
+
   /* grab pointers to our data from the channel element */
   channel_data *channeld = elem->channel_data;
 
@@ -251,17 +267,32 @@ static void init_channel_elem(grpc_channel_element *elem, grpc_channel *master,
      path */
   GPR_ASSERT(!is_last);
 
+  channeld->default_authority = NULL;
+  if (channel_args) {
+    for (i = 0; i < channel_args->num_args; i++) {
+      if (0 == strcmp(channel_args->args[i].key, GRPC_ARG_DEFAULT_AUTHORITY)) {
+        if (channel_args->args[i].type != GRPC_ARG_STRING) {
+          gpr_log(GPR_ERROR, "%s: must be an string",
+                  GRPC_ARG_DEFAULT_AUTHORITY);
+        } else {
+          channeld->default_authority = grpc_mdelem_from_strings(
+              mdctx, ":authority", channel_args->args[i].value.string);
+        }
+      }
+    }
+  }
+
   /* initialize members */
   channeld->te_trailers = grpc_mdelem_from_strings(mdctx, "te", "trailers");
   channeld->method = grpc_mdelem_from_strings(mdctx, ":method", "POST");
-  channeld->scheme =
-      grpc_mdelem_from_strings(mdctx, ":scheme", scheme_from_args(args));
+  channeld->scheme = grpc_mdelem_from_strings(mdctx, ":scheme",
+                                              scheme_from_args(channel_args));
   channeld->content_type =
       grpc_mdelem_from_strings(mdctx, "content-type", "application/grpc");
   channeld->status = grpc_mdelem_from_strings(mdctx, ":status", "200");
   channeld->user_agent = grpc_mdelem_from_metadata_strings(
-      mdctx, grpc_mdstr_from_string(mdctx, "user-agent"),
-      user_agent_from_args(mdctx, args));
+      mdctx, grpc_mdstr_from_string(mdctx, "user-agent", 0),
+      user_agent_from_args(mdctx, channel_args));
 }
 
 /* Destructor for channel data */
@@ -275,9 +306,13 @@ static void destroy_channel_elem(grpc_channel_element *elem) {
   GRPC_MDELEM_UNREF(channeld->content_type);
   GRPC_MDELEM_UNREF(channeld->status);
   GRPC_MDELEM_UNREF(channeld->user_agent);
+  if (channeld->default_authority) {
+    GRPC_MDELEM_UNREF(channeld->default_authority);
+  }
 }
 
 const grpc_channel_filter grpc_http_client_filter = {
     hc_start_transport_op, grpc_channel_next_op, sizeof(call_data),
     init_call_elem,        destroy_call_elem,    sizeof(channel_data),
-    init_channel_elem,     destroy_channel_elem, "http-client"};
+    init_channel_elem,     destroy_channel_elem, grpc_call_next_get_peer,
+    "http-client"};
diff --git a/src/core/channel/http_server_filter.c b/src/core/channel/http_server_filter.c
index a6cbb5a7f4..0955ae319a 100644
--- a/src/core/channel/http_server_filter.c
+++ b/src/core/channel/http_server_filter.c
@@ -44,6 +44,7 @@ typedef struct call_data {
   gpr_uint8 sent_status;
   gpr_uint8 seen_scheme;
   gpr_uint8 seen_te_trailers;
+  gpr_uint8 seen_authority;
   grpc_linked_mdelem status;
 
   grpc_stream_op_buffer *recv_ops;
@@ -125,6 +126,9 @@ static grpc_mdelem *server_filter(void *user_data, grpc_mdelem *md) {
     }
     calld->seen_path = 1;
     return md;
+  } else if (md->key == channeld->authority_key) {
+    calld->seen_authority = 1;
+    return md;
   } else if (md->key == channeld->host_key) {
     /* translate host to :authority since :authority may be
        omitted */
@@ -132,6 +136,7 @@ static grpc_mdelem *server_filter(void *user_data, grpc_mdelem *md) {
         channeld->mdctx, GRPC_MDSTR_REF(channeld->authority_key),
         GRPC_MDSTR_REF(md->value));
     GRPC_MDELEM_UNREF(md);
+    calld->seen_authority = 1;
     return authority;
   } else {
     return md;
@@ -154,12 +159,15 @@ static void hs_on_recv(void *user_data, int success) {
          (:method, :scheme, content-type, with :path and :authority covered
          at the channel level right now) */
       if (calld->seen_post && calld->seen_scheme && calld->seen_te_trailers &&
-          calld->seen_path) {
+          calld->seen_path && calld->seen_authority) {
         /* do nothing */
       } else {
         if (!calld->seen_path) {
           gpr_log(GPR_ERROR, "Missing :path header");
         }
+        if (!calld->seen_authority) {
+          gpr_log(GPR_ERROR, "Missing :authority header");
+        }
         if (!calld->seen_post) {
           gpr_log(GPR_ERROR, "Missing :method header");
         }
@@ -250,9 +258,9 @@ static void init_channel_elem(grpc_channel_element *elem, grpc_channel *master,
   channeld->http_scheme = grpc_mdelem_from_strings(mdctx, ":scheme", "http");
   channeld->https_scheme = grpc_mdelem_from_strings(mdctx, ":scheme", "https");
   channeld->grpc_scheme = grpc_mdelem_from_strings(mdctx, ":scheme", "grpc");
-  channeld->path_key = grpc_mdstr_from_string(mdctx, ":path");
-  channeld->authority_key = grpc_mdstr_from_string(mdctx, ":authority");
-  channeld->host_key = grpc_mdstr_from_string(mdctx, "host");
+  channeld->path_key = grpc_mdstr_from_string(mdctx, ":path", 0);
+  channeld->authority_key = grpc_mdstr_from_string(mdctx, ":authority", 0);
+  channeld->host_key = grpc_mdstr_from_string(mdctx, "host", 0);
   channeld->content_type =
       grpc_mdelem_from_strings(mdctx, "content-type", "application/grpc");
 
@@ -280,4 +288,5 @@ static void destroy_channel_elem(grpc_channel_element *elem) {
 const grpc_channel_filter grpc_http_server_filter = {
     hs_start_transport_op, grpc_channel_next_op, sizeof(call_data),
     init_call_elem,        destroy_call_elem,    sizeof(channel_data),
-    init_channel_elem,     destroy_channel_elem, "http-server"};
+    init_channel_elem,     destroy_channel_elem, grpc_call_next_get_peer,
+    "http-server"};
diff --git a/src/core/channel/noop_filter.c b/src/core/channel/noop_filter.c
index 5117723617..d631885aaf 100644
--- a/src/core/channel/noop_filter.c
+++ b/src/core/channel/noop_filter.c
@@ -127,4 +127,5 @@ const grpc_channel_filter grpc_no_op_filter = {noop_start_transport_stream_op,
                                                sizeof(channel_data),
                                                init_channel_elem,
                                                destroy_channel_elem,
+                                               grpc_call_next_get_peer,
                                                "no-op"};
diff --git a/src/core/client_config/README.md b/src/core/client_config/README.md
index d0700cfb13..fff7a5af5b 100644
--- a/src/core/client_config/README.md
+++ b/src/core/client_config/README.md
@@ -60,3 +60,7 @@ unix:path        - the unix scheme is used to create and connect to unix domain
                    sockets - the authority must be empty, and the path
                    represents the absolute or relative path to the desired
                    socket
+
+ipv4:host:port   - a pre-resolved ipv4 dotted decimal address/port combination
+
+ipv6:[host]:port - a pre-resolved ipv6 address/port combination
diff --git a/src/core/client_config/lb_policies/pick_first.c b/src/core/client_config/lb_policies/pick_first.c
index 73da624aff..5ae2e0ea52 100644
--- a/src/core/client_config/lb_policies/pick_first.c
+++ b/src/core/client_config/lb_policies/pick_first.c
@@ -62,6 +62,8 @@ typedef struct {
   grpc_subchannel *selected;
   /** have we started picking? */
   int started_picking;
+  /** are we shut down? */
+  int shutdown;
   /** which subchannel are we watching? */
   size_t checking_subchannel;
   /** what is the connectivity of that channel? */
@@ -73,12 +75,30 @@ typedef struct {
   grpc_connectivity_state_tracker state_tracker;
 } pick_first_lb_policy;
 
+static void del_interested_parties_locked(pick_first_lb_policy *p) {
+  pending_pick *pp;
+  for (pp = p->pending_picks; pp; pp = pp->next) {
+    grpc_subchannel_del_interested_party(p->subchannels[p->checking_subchannel],
+                                         pp->pollset);
+  }
+}
+
+static void add_interested_parties_locked(pick_first_lb_policy *p) {
+  pending_pick *pp;
+  for (pp = p->pending_picks; pp; pp = pp->next) {
+    grpc_subchannel_add_interested_party(p->subchannels[p->checking_subchannel],
+                                         pp->pollset);
+  }
+}
+
 void pf_destroy(grpc_lb_policy *pol) {
   pick_first_lb_policy *p = (pick_first_lb_policy *)pol;
   size_t i;
+  del_interested_parties_locked(p);
   for (i = 0; i < p->num_subchannels; i++) {
     GRPC_SUBCHANNEL_UNREF(p->subchannels[i], "pick_first");
   }
+  grpc_connectivity_state_destroy(&p->state_tracker);
   gpr_free(p->subchannels);
   gpr_mu_destroy(&p->mu);
   gpr_free(p);
@@ -88,12 +108,35 @@ void pf_shutdown(grpc_lb_policy *pol) {
   pick_first_lb_policy *p = (pick_first_lb_policy *)pol;
   pending_pick *pp;
   gpr_mu_lock(&p->mu);
+  del_interested_parties_locked(p);
+  p->shutdown = 1;
   while ((pp = p->pending_picks)) {
     p->pending_picks = pp->next;
     *pp->target = NULL;
     grpc_iomgr_add_delayed_callback(pp->on_complete, 0);
     gpr_free(pp);
   }
+  grpc_connectivity_state_set(&p->state_tracker, GRPC_CHANNEL_FATAL_FAILURE,
+                              "shutdown");
+  gpr_mu_unlock(&p->mu);
+}
+
+static void start_picking(pick_first_lb_policy *p) {
+  p->started_picking = 1;
+  p->checking_subchannel = 0;
+  p->checking_connectivity = GRPC_CHANNEL_IDLE;
+  GRPC_LB_POLICY_REF(&p->base, "pick_first_connectivity");
+  grpc_subchannel_notify_on_state_change(p->subchannels[p->checking_subchannel],
+                                         &p->checking_connectivity,
+                                         &p->connectivity_changed);
+}
+
+void pf_exit_idle(grpc_lb_policy *pol) {
+  pick_first_lb_policy *p = (pick_first_lb_policy *)pol;
+  gpr_mu_lock(&p->mu);
+  if (!p->started_picking) {
+    start_picking(p);
+  }
   gpr_mu_unlock(&p->mu);
 }
 
@@ -109,13 +152,7 @@ void pf_pick(grpc_lb_policy *pol, grpc_pollset *pollset,
     on_complete->cb(on_complete->cb_arg, 1);
   } else {
     if (!p->started_picking) {
-      p->started_picking = 1;
-      p->checking_subchannel = 0;
-      p->checking_connectivity = GRPC_CHANNEL_IDLE;
-      GRPC_LB_POLICY_REF(pol, "pick_first_connectivity");
-      grpc_subchannel_notify_on_state_change(
-          p->subchannels[p->checking_subchannel], &p->checking_connectivity,
-          &p->connectivity_changed);
+      start_picking(p);
     }
     grpc_subchannel_add_interested_party(p->subchannels[p->checking_subchannel],
                                          pollset);
@@ -129,77 +166,97 @@ void pf_pick(grpc_lb_policy *pol, grpc_pollset *pollset,
   }
 }
 
-static void del_interested_parties_locked(pick_first_lb_policy *p) {
-  pending_pick *pp;
-  for (pp = p->pending_picks; pp; pp = pp->next) {
-    grpc_subchannel_del_interested_party(p->subchannels[p->checking_subchannel],
-                                         pp->pollset);
-  }
-}
-
-static void add_interested_parties_locked(pick_first_lb_policy *p) {
-  pending_pick *pp;
-  for (pp = p->pending_picks; pp; pp = pp->next) {
-    grpc_subchannel_add_interested_party(p->subchannels[p->checking_subchannel],
-                                         pp->pollset);
-  }
-}
-
 static void pf_connectivity_changed(void *arg, int iomgr_success) {
   pick_first_lb_policy *p = arg;
   pending_pick *pp;
   int unref = 0;
 
   gpr_mu_lock(&p->mu);
-loop:
-  switch (p->checking_connectivity) {
-    case GRPC_CHANNEL_READY:
-      p->selected = p->subchannels[p->checking_subchannel];
-      while ((pp = p->pending_picks)) {
-        p->pending_picks = pp->next;
-        *pp->target = p->selected;
-        grpc_subchannel_del_interested_party(p->selected, pp->pollset);
-        grpc_iomgr_add_delayed_callback(pp->on_complete, 1);
-        gpr_free(pp);
-      }
-      unref = 1;
-      break;
-    case GRPC_CHANNEL_TRANSIENT_FAILURE:
-      del_interested_parties_locked(p);
-      p->checking_subchannel =
-          (p->checking_subchannel + 1) % p->num_subchannels;
-      p->checking_connectivity = grpc_subchannel_check_connectivity(
-          p->subchannels[p->checking_subchannel]);
-      add_interested_parties_locked(p);
-      goto loop;
-    case GRPC_CHANNEL_CONNECTING:
-    case GRPC_CHANNEL_IDLE:
+
+  if (p->shutdown) {
+    unref = 1;
+  } else if (p->selected != NULL) {
+    grpc_connectivity_state_set(&p->state_tracker, p->checking_connectivity,
+                                "selected_changed");
+    if (p->checking_connectivity != GRPC_CHANNEL_FATAL_FAILURE) {
       grpc_subchannel_notify_on_state_change(
-          p->subchannels[p->checking_subchannel], &p->checking_connectivity,
-          &p->connectivity_changed);
-      break;
-    case GRPC_CHANNEL_FATAL_FAILURE:
-      del_interested_parties_locked(p);
-      GPR_SWAP(grpc_subchannel *, p->subchannels[p->checking_subchannel],
-               p->subchannels[p->num_subchannels - 1]);
-      p->num_subchannels--;
-      GRPC_SUBCHANNEL_UNREF(p->subchannels[p->num_subchannels], "pick_first");
-      if (p->num_subchannels == 0) {
+          p->selected, &p->checking_connectivity, &p->connectivity_changed);
+    } else {
+      unref = 1;
+    }
+  } else {
+  loop:
+    switch (p->checking_connectivity) {
+      case GRPC_CHANNEL_READY:
+        grpc_connectivity_state_set(&p->state_tracker, GRPC_CHANNEL_READY,
+                                    "connecting_ready");
+        p->selected = p->subchannels[p->checking_subchannel];
         while ((pp = p->pending_picks)) {
           p->pending_picks = pp->next;
-          *pp->target = NULL;
+          *pp->target = p->selected;
+          grpc_subchannel_del_interested_party(p->selected, pp->pollset);
           grpc_iomgr_add_delayed_callback(pp->on_complete, 1);
           gpr_free(pp);
         }
-        unref = 1;
-      } else {
-        p->checking_subchannel %= p->num_subchannels;
+        grpc_subchannel_notify_on_state_change(
+            p->selected, &p->checking_connectivity, &p->connectivity_changed);
+        break;
+      case GRPC_CHANNEL_TRANSIENT_FAILURE:
+        grpc_connectivity_state_set(&p->state_tracker,
+                                    GRPC_CHANNEL_TRANSIENT_FAILURE,
+                                    "connecting_transient_failure");
+        del_interested_parties_locked(p);
+        p->checking_subchannel =
+            (p->checking_subchannel + 1) % p->num_subchannels;
         p->checking_connectivity = grpc_subchannel_check_connectivity(
             p->subchannels[p->checking_subchannel]);
         add_interested_parties_locked(p);
-        goto loop;
-      }
+        if (p->checking_connectivity == GRPC_CHANNEL_TRANSIENT_FAILURE) {
+          grpc_subchannel_notify_on_state_change(
+              p->subchannels[p->checking_subchannel], &p->checking_connectivity,
+              &p->connectivity_changed);
+        } else {
+          goto loop;
+        }
+        break;
+      case GRPC_CHANNEL_CONNECTING:
+      case GRPC_CHANNEL_IDLE:
+        grpc_connectivity_state_set(&p->state_tracker, p->checking_connectivity,
+                                    "connecting_changed");
+        grpc_subchannel_notify_on_state_change(
+            p->subchannels[p->checking_subchannel], &p->checking_connectivity,
+            &p->connectivity_changed);
+        break;
+      case GRPC_CHANNEL_FATAL_FAILURE:
+        del_interested_parties_locked(p);
+        GPR_SWAP(grpc_subchannel *, p->subchannels[p->checking_subchannel],
+                 p->subchannels[p->num_subchannels - 1]);
+        p->num_subchannels--;
+        GRPC_SUBCHANNEL_UNREF(p->subchannels[p->num_subchannels], "pick_first");
+        if (p->num_subchannels == 0) {
+          grpc_connectivity_state_set(&p->state_tracker,
+                                      GRPC_CHANNEL_FATAL_FAILURE,
+                                      "no_more_channels");
+          while ((pp = p->pending_picks)) {
+            p->pending_picks = pp->next;
+            *pp->target = NULL;
+            grpc_iomgr_add_delayed_callback(pp->on_complete, 1);
+            gpr_free(pp);
+          }
+          unref = 1;
+        } else {
+          grpc_connectivity_state_set(&p->state_tracker,
+                                      GRPC_CHANNEL_TRANSIENT_FAILURE,
+                                      "subchannel_failed");
+          p->checking_subchannel %= p->num_subchannels;
+          p->checking_connectivity = grpc_subchannel_check_connectivity(
+              p->subchannels[p->checking_subchannel]);
+          add_interested_parties_locked(p);
+          goto loop;
+        }
+    }
   }
+
   gpr_mu_unlock(&p->mu);
 
   if (unref) {
@@ -249,8 +306,13 @@ static void pf_notify_on_state_change(grpc_lb_policy *pol,
 }
 
 static const grpc_lb_policy_vtable pick_first_lb_policy_vtable = {
-    pf_destroy,   pf_shutdown,           pf_pick,
-    pf_broadcast, pf_check_connectivity, pf_notify_on_state_change};
+    pf_destroy,
+    pf_shutdown,
+    pf_pick,
+    pf_exit_idle,
+    pf_broadcast,
+    pf_check_connectivity,
+    pf_notify_on_state_change};
 
 grpc_lb_policy *grpc_create_pick_first_lb_policy(grpc_subchannel **subchannels,
                                                  size_t num_subchannels) {
@@ -260,6 +322,8 @@ grpc_lb_policy *grpc_create_pick_first_lb_policy(grpc_subchannel **subchannels,
   grpc_lb_policy_init(&p->base, &pick_first_lb_policy_vtable);
   p->subchannels = gpr_malloc(sizeof(grpc_subchannel *) * num_subchannels);
   p->num_subchannels = num_subchannels;
+  grpc_connectivity_state_init(&p->state_tracker, GRPC_CHANNEL_IDLE,
+                               "pick_first");
   memcpy(p->subchannels, subchannels,
          sizeof(grpc_subchannel *) * num_subchannels);
   grpc_iomgr_closure_init(&p->connectivity_changed, pf_connectivity_changed, p);
diff --git a/src/core/client_config/lb_policy.c b/src/core/client_config/lb_policy.c
index 6d1c788742..90ec44432f 100644
--- a/src/core/client_config/lb_policy.c
+++ b/src/core/client_config/lb_policy.c
@@ -77,3 +77,18 @@ void grpc_lb_policy_pick(grpc_lb_policy *policy, grpc_pollset *pollset,
 void grpc_lb_policy_broadcast(grpc_lb_policy *policy, grpc_transport_op *op) {
   policy->vtable->broadcast(policy, op);
 }
+
+void grpc_lb_policy_exit_idle(grpc_lb_policy *policy) {
+  policy->vtable->exit_idle(policy);
+}
+
+void grpc_lb_policy_notify_on_state_change(grpc_lb_policy *policy,
+                                           grpc_connectivity_state *state,
+                                           grpc_iomgr_closure *closure) {
+  policy->vtable->notify_on_state_change(policy, state, closure);
+}
+
+grpc_connectivity_state grpc_lb_policy_check_connectivity(
+    grpc_lb_policy *policy) {
+  return policy->vtable->check_connectivity(policy);
+}
diff --git a/src/core/client_config/lb_policy.h b/src/core/client_config/lb_policy.h
index a468f761cc..3f7ca8f28d 100644
--- a/src/core/client_config/lb_policy.h
+++ b/src/core/client_config/lb_policy.h
@@ -59,6 +59,9 @@ struct grpc_lb_policy_vtable {
                grpc_metadata_batch *initial_metadata, grpc_subchannel **target,
                grpc_iomgr_closure *on_complete);
 
+  /** try to enter a READY connectivity state */
+  void (*exit_idle)(grpc_lb_policy *policy);
+
   /** broadcast a transport op to all subchannels */
   void (*broadcast)(grpc_lb_policy *policy, grpc_transport_op *op);
 
@@ -106,4 +109,13 @@ void grpc_lb_policy_pick(grpc_lb_policy *policy, grpc_pollset *pollset,
 
 void grpc_lb_policy_broadcast(grpc_lb_policy *policy, grpc_transport_op *op);
 
+void grpc_lb_policy_exit_idle(grpc_lb_policy *policy);
+
+void grpc_lb_policy_notify_on_state_change(grpc_lb_policy *policy,
+                                           grpc_connectivity_state *state,
+                                           grpc_iomgr_closure *closure);
+
+grpc_connectivity_state grpc_lb_policy_check_connectivity(
+    grpc_lb_policy *policy);
+
 #endif /* GRPC_INTERNAL_CORE_CONFIG_LB_POLICY_H */
diff --git a/src/core/client_config/resolvers/dns_resolver.c b/src/core/client_config/resolvers/dns_resolver.c
index ac401bc4d3..827b1a2be5 100644
--- a/src/core/client_config/resolvers/dns_resolver.c
+++ b/src/core/client_config/resolvers/dns_resolver.c
@@ -36,9 +36,11 @@
 #include <string.h>
 
 #include <grpc/support/alloc.h>
+#include <grpc/support/host_port.h>
 #include <grpc/support/string_util.h>
 
 #include "src/core/client_config/lb_policies/pick_first.h"
+#include "src/core/client_config/subchannel_factory_decorators/add_channel_arg.h"
 #include "src/core/iomgr/resolve_address.h"
 #include "src/core/support/string.h"
 
@@ -201,6 +203,9 @@ static grpc_resolver *dns_create(
     grpc_subchannel_factory *subchannel_factory) {
   dns_resolver *r;
   const char *path = uri->path;
+  grpc_arg default_host_arg;
+  char *host;
+  char *port;
 
   if (0 != strcmp(uri->authority, "")) {
     gpr_log(GPR_ERROR, "authority based uri's not supported");
@@ -209,6 +214,16 @@ static grpc_resolver *dns_create(
 
   if (path[0] == '/') ++path;
 
+  gpr_split_host_port(path, &host, &port);
+
+  default_host_arg.type = GRPC_ARG_STRING;
+  default_host_arg.key = GRPC_ARG_DEFAULT_AUTHORITY;
+  default_host_arg.value.string = host;
+  subchannel_factory = grpc_subchannel_factory_add_channel_arg(subchannel_factory, &default_host_arg);
+
+  gpr_free(host);
+  gpr_free(port);
+
   r = gpr_malloc(sizeof(dns_resolver));
   memset(r, 0, sizeof(*r));
   gpr_ref_init(&r->refs, 1);
@@ -218,7 +233,6 @@ static grpc_resolver *dns_create(
   r->default_port = gpr_strdup(default_port);
   r->subchannel_factory = subchannel_factory;
   r->lb_policy_factory = lb_policy_factory;
-  grpc_subchannel_factory_ref(subchannel_factory);
   return &r->base;
 }
 
diff --git a/src/core/client_config/resolvers/sockaddr_resolver.c b/src/core/client_config/resolvers/sockaddr_resolver.c
new file mode 100644
index 0000000000..74584e7e2c
--- /dev/null
+++ b/src/core/client_config/resolvers/sockaddr_resolver.c
@@ -0,0 +1,299 @@
+/*
+ *
+ * Copyright 2015, Google Inc.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *
+ *     * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above
+ * copyright notice, this list of conditions and the following disclaimer
+ * in the documentation and/or other materials provided with the
+ * distribution.
+ *     * Neither the name of Google Inc. nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ */
+
+#include <grpc/support/port_platform.h>
+
+#include "src/core/client_config/resolvers/sockaddr_resolver.h"
+
+#include <stdio.h>
+#include <string.h>
+#ifdef GPR_POSIX_SOCKET
+#include <sys/un.h>
+#endif
+
+#include <grpc/support/alloc.h>
+#include <grpc/support/host_port.h>
+#include <grpc/support/string_util.h>
+
+#include "src/core/client_config/lb_policies/pick_first.h"
+#include "src/core/iomgr/resolve_address.h"
+#include "src/core/support/string.h"
+
+typedef struct {
+  /** base class: must be first */
+  grpc_resolver base;
+  /** refcount */
+  gpr_refcount refs;
+  /** subchannel factory */
+  grpc_subchannel_factory *subchannel_factory;
+  /** load balancing policy factory */
+  grpc_lb_policy *(*lb_policy_factory)(grpc_subchannel **subchannels,
+                                       size_t num_subchannels);
+
+  /** the address that we've 'resolved' */
+  struct sockaddr_storage addr;
+  int addr_len;
+
+  /** mutex guarding the rest of the state */
+  gpr_mu mu;
+  /** have we published? */
+  int published;
+  /** pending next completion, or NULL */
+  grpc_iomgr_closure *next_completion;
+  /** target config address for next completion */
+  grpc_client_config **target_config;
+} sockaddr_resolver;
+
+static void sockaddr_destroy(grpc_resolver *r);
+
+static void sockaddr_maybe_finish_next_locked(sockaddr_resolver *r);
+
+static void sockaddr_shutdown(grpc_resolver *r);
+static void sockaddr_channel_saw_error(grpc_resolver *r,
+                                       struct sockaddr *failing_address,
+                                       int failing_address_len);
+static void sockaddr_next(grpc_resolver *r, grpc_client_config **target_config,
+                          grpc_iomgr_closure *on_complete);
+
+static const grpc_resolver_vtable sockaddr_resolver_vtable = {
+    sockaddr_destroy, sockaddr_shutdown, sockaddr_channel_saw_error,
+    sockaddr_next};
+
+static void sockaddr_shutdown(grpc_resolver *resolver) {
+  sockaddr_resolver *r = (sockaddr_resolver *)resolver;
+  gpr_mu_lock(&r->mu);
+  if (r->next_completion != NULL) {
+    *r->target_config = NULL;
+    /* TODO(ctiller): add delayed callback */
+    grpc_iomgr_add_callback(r->next_completion);
+    r->next_completion = NULL;
+  }
+  gpr_mu_unlock(&r->mu);
+}
+
+static void sockaddr_channel_saw_error(grpc_resolver *resolver,
+                                       struct sockaddr *sa, int len) {}
+
+static void sockaddr_next(grpc_resolver *resolver,
+                          grpc_client_config **target_config,
+                          grpc_iomgr_closure *on_complete) {
+  sockaddr_resolver *r = (sockaddr_resolver *)resolver;
+  gpr_mu_lock(&r->mu);
+  GPR_ASSERT(!r->next_completion);
+  r->next_completion = on_complete;
+  r->target_config = target_config;
+  sockaddr_maybe_finish_next_locked(r);
+  gpr_mu_unlock(&r->mu);
+}
+
+static void sockaddr_maybe_finish_next_locked(sockaddr_resolver *r) {
+  grpc_client_config *cfg;
+  grpc_lb_policy *lb_policy;
+  grpc_subchannel *subchannel;
+  grpc_subchannel_args args;
+
+  if (r->next_completion != NULL && !r->published) {
+    cfg = grpc_client_config_create();
+    memset(&args, 0, sizeof(args));
+    args.addr = (struct sockaddr *)&r->addr;
+    args.addr_len = r->addr_len;
+    subchannel =
+        grpc_subchannel_factory_create_subchannel(r->subchannel_factory, &args);
+    lb_policy = r->lb_policy_factory(&subchannel, 1);
+    grpc_client_config_set_lb_policy(cfg, lb_policy);
+    GRPC_LB_POLICY_UNREF(lb_policy, "unix");
+    r->published = 1;
+    *r->target_config = cfg;
+    grpc_iomgr_add_callback(r->next_completion);
+    r->next_completion = NULL;
+  }
+}
+
+static void sockaddr_destroy(grpc_resolver *gr) {
+  sockaddr_resolver *r = (sockaddr_resolver *)gr;
+  gpr_mu_destroy(&r->mu);
+  grpc_subchannel_factory_unref(r->subchannel_factory);
+  gpr_free(r);
+}
+
+#ifdef GPR_POSIX_SOCKET
+static int parse_unix(grpc_uri *uri, struct sockaddr_storage *addr, int *len) {
+  struct sockaddr_un *un = (struct sockaddr_un *)addr;
+
+  un->sun_family = AF_UNIX;
+  strcpy(un->sun_path, uri->path);
+  *len = strlen(un->sun_path) + sizeof(un->sun_family) + 1;
+
+  return 1;
+}
+#endif
+
+static int parse_ipv4(grpc_uri *uri, struct sockaddr_storage *addr, int *len) {
+  const char *host_port = uri->path;
+  char *host;
+  char *port;
+  int port_num;
+  int result = 0;
+  struct sockaddr_in *in = (struct sockaddr_in *)addr;
+
+  if (*host_port == '/') ++host_port;
+  if (!gpr_split_host_port(host_port, &host, &port)) {
+    return 0;
+  }
+
+  memset(in, 0, sizeof(*in));
+  *len = sizeof(*in);
+  in->sin_family = AF_INET;
+  if (inet_pton(AF_INET, host, &in->sin_addr) == 0) {
+    gpr_log(GPR_ERROR, "invalid ipv4 address: '%s'", host);
+    goto done;
+  }
+
+  if (port != NULL) {
+    if (sscanf(port, "%d", &port_num) != 1 || port_num < 0 ||
+        port_num > 65535) {
+      gpr_log(GPR_ERROR, "invalid ipv4 port: '%s'", port);
+      goto done;
+    }
+    in->sin_port = htons(port_num);
+  } else {
+    gpr_log(GPR_ERROR, "no port given for ipv4 scheme");
+    goto done;
+  }
+
+  result = 1;
+done:
+  gpr_free(host);
+  gpr_free(port);
+  return result;
+}
+
+static int parse_ipv6(grpc_uri *uri, struct sockaddr_storage *addr, int *len) {
+  const char *host_port = uri->path;
+  char *host;
+  char *port;
+  int port_num;
+  int result = 0;
+  struct sockaddr_in6 *in6 = (struct sockaddr_in6 *)addr;
+
+  if (*host_port == '/') ++host_port;
+  if (!gpr_split_host_port(host_port, &host, &port)) {
+    return 0;
+  }
+
+  memset(in6, 0, sizeof(*in6));
+  *len = sizeof(*in6);
+  in6->sin6_family = AF_INET6;
+  if (inet_pton(AF_INET6, host, &in6->sin6_addr) == 0) {
+    gpr_log(GPR_ERROR, "invalid ipv6 address: '%s'", host);
+    goto done;
+  }
+
+  if (port != NULL) {
+    if (sscanf(port, "%d", &port_num) != 1 || port_num < 0 ||
+        port_num > 65535) {
+      gpr_log(GPR_ERROR, "invalid ipv6 port: '%s'", port);
+      goto done;
+    }
+    in6->sin6_port = htons(port_num);
+  } else {
+    gpr_log(GPR_ERROR, "no port given for ipv6 scheme");
+    goto done;
+  }
+
+  result = 1;
+done:
+  gpr_free(host);
+  gpr_free(port);
+  return result;
+}
+
+static grpc_resolver *sockaddr_create(
+    grpc_uri *uri,
+    grpc_lb_policy *(*lb_policy_factory)(grpc_subchannel **subchannels,
+                                         size_t num_subchannels),
+    grpc_subchannel_factory *subchannel_factory,
+    int parse(grpc_uri *uri, struct sockaddr_storage *dst, int *len)) {
+  sockaddr_resolver *r;
+
+  if (0 != strcmp(uri->authority, "")) {
+    gpr_log(GPR_ERROR, "authority based uri's not supported");
+    return NULL;
+  }
+
+  r = gpr_malloc(sizeof(sockaddr_resolver));
+  memset(r, 0, sizeof(*r));
+  if (!parse(uri, &r->addr, &r->addr_len)) {
+    gpr_free(r);
+    return NULL;
+  }
+
+  gpr_ref_init(&r->refs, 1);
+  gpr_mu_init(&r->mu);
+  grpc_resolver_init(&r->base, &sockaddr_resolver_vtable);
+  r->subchannel_factory = subchannel_factory;
+  r->lb_policy_factory = lb_policy_factory;
+
+  grpc_subchannel_factory_ref(subchannel_factory);
+  return &r->base;
+}
+
+/*
+ * FACTORY
+ */
+
+static void sockaddr_factory_ref(grpc_resolver_factory *factory) {}
+
+static void sockaddr_factory_unref(grpc_resolver_factory *factory) {}
+
+#define DECL_FACTORY(name)                                            \
+  static grpc_resolver *name##_factory_create_resolver(               \
+      grpc_resolver_factory *factory, grpc_uri *uri,                  \
+      grpc_subchannel_factory *subchannel_factory) {                  \
+    return sockaddr_create(uri, grpc_create_pick_first_lb_policy,     \
+                           subchannel_factory, parse_##name);         \
+  }                                                                   \
+  static const grpc_resolver_factory_vtable name##_factory_vtable = { \
+      sockaddr_factory_ref, sockaddr_factory_unref,                   \
+      name##_factory_create_resolver};                                \
+  static grpc_resolver_factory name##_resolver_factory = {            \
+      &name##_factory_vtable};                                        \
+  grpc_resolver_factory *grpc_##name##_resolver_factory_create() {    \
+    return &name##_resolver_factory;                                  \
+  }
+
+#ifdef GPR_POSIX_SOCKET
+DECL_FACTORY(unix)
+#endif
+DECL_FACTORY(ipv4)
+DECL_FACTORY(ipv6)
diff --git a/src/core/client_config/resolvers/unix_resolver_posix.h b/src/core/client_config/resolvers/sockaddr_resolver.h
index 57ace59e21..1b7a18f9c2 100644
--- a/src/core/client_config/resolvers/unix_resolver_posix.h
+++ b/src/core/client_config/resolvers/sockaddr_resolver.h
@@ -38,7 +38,13 @@
 
 #include "src/core/client_config/resolver_factory.h"
 
+grpc_resolver_factory *grpc_ipv4_resolver_factory_create(void);
+
+grpc_resolver_factory *grpc_ipv6_resolver_factory_create(void);
+
+#ifdef GPR_POSIX_SOCKET
 /** Create a unix resolver factory */
 grpc_resolver_factory *grpc_unix_resolver_factory_create(void);
+#endif
 
 #endif /* GRPC_INTERNAL_CORE_CLIENT_CONFIG_RESOLVERS_UNIX_RESOLVER_H */
diff --git a/src/core/client_config/resolvers/unix_resolver_posix.c b/src/core/client_config/resolvers/unix_resolver_posix.c
deleted file mode 100644
index be515d2689..0000000000
--- a/src/core/client_config/resolvers/unix_resolver_posix.c
+++ /dev/null
@@ -1,195 +0,0 @@
-/*
- *
- * Copyright 2015, Google Inc.
- * All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions are
- * met:
- *
- *     * Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- *     * Redistributions in binary form must reproduce the above
- * copyright notice, this list of conditions and the following disclaimer
- * in the documentation and/or other materials provided with the
- * distribution.
- *     * Neither the name of Google Inc. nor the names of its
- * contributors may be used to endorse or promote products derived from
- * this software without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
- * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
- * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
- * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
- * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
- * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
- * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
- * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
- * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
- * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
- * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
- *
- */
-
-#include <grpc/support/port_platform.h>
-#ifdef GPR_POSIX_SOCKET
-
-#include "src/core/client_config/resolvers/unix_resolver_posix.h"
-
-#include <string.h>
-#include <sys/un.h>
-
-#include <grpc/support/alloc.h>
-#include <grpc/support/string_util.h>
-
-#include "src/core/client_config/lb_policies/pick_first.h"
-#include "src/core/iomgr/resolve_address.h"
-#include "src/core/support/string.h"
-
-typedef struct {
-  /** base class: must be first */
-  grpc_resolver base;
-  /** refcount */
-  gpr_refcount refs;
-  /** subchannel factory */
-  grpc_subchannel_factory *subchannel_factory;
-  /** load balancing policy factory */
-  grpc_lb_policy *(*lb_policy_factory)(grpc_subchannel **subchannels,
-                                       size_t num_subchannels);
-
-  /** the address that we've 'resolved' */
-  struct sockaddr_un addr;
-  int addr_len;
-
-  /** mutex guarding the rest of the state */
-  gpr_mu mu;
-  /** have we published? */
-  int published;
-  /** pending next completion, or NULL */
-  grpc_iomgr_closure *next_completion;
-  /** target config address for next completion */
-  grpc_client_config **target_config;
-} unix_resolver;
-
-static void unix_destroy(grpc_resolver *r);
-
-static void unix_maybe_finish_next_locked(unix_resolver *r);
-
-static void unix_shutdown(grpc_resolver *r);
-static void unix_channel_saw_error(grpc_resolver *r,
-                                   struct sockaddr *failing_address,
-                                   int failing_address_len);
-static void unix_next(grpc_resolver *r, grpc_client_config **target_config,
-                      grpc_iomgr_closure *on_complete);
-
-static const grpc_resolver_vtable unix_resolver_vtable = {
-    unix_destroy, unix_shutdown, unix_channel_saw_error, unix_next};
-
-static void unix_shutdown(grpc_resolver *resolver) {
-  unix_resolver *r = (unix_resolver *)resolver;
-  gpr_mu_lock(&r->mu);
-  if (r->next_completion != NULL) {
-    *r->target_config = NULL;
-    /* TODO(ctiller): add delayed callback */
-    grpc_iomgr_add_callback(r->next_completion);
-    r->next_completion = NULL;
-  }
-  gpr_mu_unlock(&r->mu);
-}
-
-static void unix_channel_saw_error(grpc_resolver *resolver, struct sockaddr *sa,
-                                   int len) {}
-
-static void unix_next(grpc_resolver *resolver,
-                      grpc_client_config **target_config,
-                      grpc_iomgr_closure *on_complete) {
-  unix_resolver *r = (unix_resolver *)resolver;
-  gpr_mu_lock(&r->mu);
-  GPR_ASSERT(!r->next_completion);
-  r->next_completion = on_complete;
-  r->target_config = target_config;
-  unix_maybe_finish_next_locked(r);
-  gpr_mu_unlock(&r->mu);
-}
-
-static void unix_maybe_finish_next_locked(unix_resolver *r) {
-  grpc_client_config *cfg;
-  grpc_lb_policy *lb_policy;
-  grpc_subchannel *subchannel;
-  grpc_subchannel_args args;
-
-  if (r->next_completion != NULL && !r->published) {
-    cfg = grpc_client_config_create();
-    memset(&args, 0, sizeof(args));
-    args.addr = (struct sockaddr *)&r->addr;
-    args.addr_len = r->addr_len;
-    subchannel =
-        grpc_subchannel_factory_create_subchannel(r->subchannel_factory, &args);
-    lb_policy = r->lb_policy_factory(&subchannel, 1);
-    grpc_client_config_set_lb_policy(cfg, lb_policy);
-    GRPC_LB_POLICY_UNREF(lb_policy, "unix");
-    r->published = 1;
-    *r->target_config = cfg;
-    grpc_iomgr_add_callback(r->next_completion);
-    r->next_completion = NULL;
-  }
-}
-
-static void unix_destroy(grpc_resolver *gr) {
-  unix_resolver *r = (unix_resolver *)gr;
-  gpr_mu_destroy(&r->mu);
-  grpc_subchannel_factory_unref(r->subchannel_factory);
-  gpr_free(r);
-}
-
-static grpc_resolver *unix_create(
-    grpc_uri *uri,
-    grpc_lb_policy *(*lb_policy_factory)(grpc_subchannel **subchannels,
-                                         size_t num_subchannels),
-    grpc_subchannel_factory *subchannel_factory) {
-  unix_resolver *r;
-
-  if (0 != strcmp(uri->authority, "")) {
-    gpr_log(GPR_ERROR, "authority based uri's not supported");
-    return NULL;
-  }
-
-  r = gpr_malloc(sizeof(unix_resolver));
-  memset(r, 0, sizeof(*r));
-  gpr_ref_init(&r->refs, 1);
-  gpr_mu_init(&r->mu);
-  grpc_resolver_init(&r->base, &unix_resolver_vtable);
-  r->subchannel_factory = subchannel_factory;
-  r->lb_policy_factory = lb_policy_factory;
-
-  r->addr.sun_family = AF_UNIX;
-  strcpy(r->addr.sun_path, uri->path);
-  r->addr_len = strlen(r->addr.sun_path) + sizeof(r->addr.sun_family) + 1;
-
-  grpc_subchannel_factory_ref(subchannel_factory);
-  return &r->base;
-}
-
-/*
- * FACTORY
- */
-
-static void unix_factory_ref(grpc_resolver_factory *factory) {}
-
-static void unix_factory_unref(grpc_resolver_factory *factory) {}
-
-static grpc_resolver *unix_factory_create_resolver(
-    grpc_resolver_factory *factory, grpc_uri *uri,
-    grpc_subchannel_factory *subchannel_factory) {
-  return unix_create(uri, grpc_create_pick_first_lb_policy, subchannel_factory);
-}
-
-static const grpc_resolver_factory_vtable unix_factory_vtable = {
-    unix_factory_ref, unix_factory_unref, unix_factory_create_resolver};
-static grpc_resolver_factory unix_resolver_factory = {&unix_factory_vtable};
-
-grpc_resolver_factory *grpc_unix_resolver_factory_create() {
-  return &unix_resolver_factory;
-}
-
-#endif
diff --git a/src/core/client_config/subchannel.c b/src/core/client_config/subchannel.c
index 487f5afb35..ca52c75beb 100644
--- a/src/core/client_config/subchannel.c
+++ b/src/core/client_config/subchannel.c
@@ -38,9 +38,17 @@
 #include <grpc/support/alloc.h>
 
 #include "src/core/channel/channel_args.h"
+#include "src/core/channel/client_channel.h"
 #include "src/core/channel/connected_channel.h"
 #include "src/core/iomgr/alarm.h"
 #include "src/core/transport/connectivity_state.h"
+#include "src/core/surface/channel.h"
+
+#define GRPC_SUBCHANNEL_MIN_CONNECT_TIMEOUT_SECONDS 20
+#define GRPC_SUBCHANNEL_INITIAL_CONNECT_BACKOFF_SECONDS 1
+#define GRPC_SUBCHANNEL_RECONNECT_BACKOFF_MULTIPLIER 1.6
+#define GRPC_SUBCHANNEL_RECONNECT_MAX_BACKOFF_SECONDS 120
+#define GRPC_SUBCHANNEL_RECONNECT_JITTER 0.2
 
 typedef struct {
   /* all fields protected by subchannel->mu */
@@ -94,8 +102,10 @@ struct grpc_subchannel {
   grpc_iomgr_closure connected;
 
   /** pollset_set tracking who's interested in a connection
-      being setup */
-  grpc_pollset_set pollset_set;
+      being setup - owned by the master channel (in particular the
+     client_channel
+      filter there-in) */
+  grpc_pollset_set *pollset_set;
 
   /** mutex protecting remaining elements */
   gpr_mu mu;
@@ -121,6 +131,8 @@ struct grpc_subchannel {
   int have_alarm;
   /** our alarm */
   grpc_alarm alarm;
+  /** current random value */
+  gpr_uint32 random;
 };
 
 struct grpc_subchannel_call {
@@ -132,7 +144,8 @@ struct grpc_subchannel_call {
 #define CHANNEL_STACK_FROM_CONNECTION(con) ((grpc_channel_stack *)((con) + 1))
 
 static grpc_subchannel_call *create_call(connection *con);
-static void connectivity_state_changed_locked(grpc_subchannel *c);
+static void connectivity_state_changed_locked(grpc_subchannel *c,
+                                              const char *reason);
 static grpc_connectivity_state compute_connectivity_locked(grpc_subchannel *c);
 static gpr_timespec compute_connect_deadline(grpc_subchannel *c);
 static void subchannel_connected(void *subchannel, int iomgr_success);
@@ -244,7 +257,6 @@ static void subchannel_destroy(grpc_subchannel *c) {
   grpc_channel_args_destroy(c->args);
   gpr_free(c->addr);
   grpc_mdctx_unref(c->mdctx);
-  grpc_pollset_set_destroy(&c->pollset_set);
   grpc_connectivity_state_destroy(&c->state_tracker);
   grpc_connector_unref(c->connector);
   gpr_free(c);
@@ -252,17 +264,23 @@ static void subchannel_destroy(grpc_subchannel *c) {
 
 void grpc_subchannel_add_interested_party(grpc_subchannel *c,
                                           grpc_pollset *pollset) {
-  grpc_pollset_set_add_pollset(&c->pollset_set, pollset);
+  grpc_pollset_set_add_pollset(c->pollset_set, pollset);
 }
 
 void grpc_subchannel_del_interested_party(grpc_subchannel *c,
                                           grpc_pollset *pollset) {
-  grpc_pollset_set_del_pollset(&c->pollset_set, pollset);
+  grpc_pollset_set_del_pollset(c->pollset_set, pollset);
+}
+
+static gpr_uint32 random_seed() {
+  return (gpr_uint32)(gpr_time_to_millis(gpr_now(GPR_CLOCK_MONOTONIC)));
 }
 
 grpc_subchannel *grpc_subchannel_create(grpc_connector *connector,
                                         grpc_subchannel_args *args) {
   grpc_subchannel *c = gpr_malloc(sizeof(*c));
+  grpc_channel_element *parent_elem = grpc_channel_stack_last_element(
+      grpc_channel_get_channel_stack(args->master));
   memset(c, 0, sizeof(*c));
   c->refs = 1;
   c->connector = connector;
@@ -277,10 +295,12 @@ grpc_subchannel *grpc_subchannel_create(grpc_connector *connector,
   c->args = grpc_channel_args_copy(args->args);
   c->mdctx = args->mdctx;
   c->master = args->master;
+  c->pollset_set = grpc_client_channel_get_connecting_pollset_set(parent_elem);
+  c->random = random_seed();
   grpc_mdctx_ref(c->mdctx);
-  grpc_pollset_set_init(&c->pollset_set);
   grpc_iomgr_closure_init(&c->connected, subchannel_connected, c);
-  grpc_connectivity_state_init(&c->state_tracker, GRPC_CHANNEL_IDLE);
+  grpc_connectivity_state_init(&c->state_tracker, GRPC_CHANNEL_IDLE,
+                               "subchannel");
   gpr_mu_init(&c->mu);
   return c;
 }
@@ -288,7 +308,7 @@ grpc_subchannel *grpc_subchannel_create(grpc_connector *connector,
 static void continue_connect(grpc_subchannel *c) {
   grpc_connect_in_args args;
 
-  args.interested_parties = &c->pollset_set;
+  args.interested_parties = c->pollset_set;
   args.addr = c->addr;
   args.addr_len = c->addr_len;
   args.deadline = compute_connect_deadline(c);
@@ -300,15 +320,16 @@ static void continue_connect(grpc_subchannel *c) {
 }
 
 static void start_connect(grpc_subchannel *c) {
-  gpr_timespec now = gpr_now(GPR_CLOCK_MONOTONIC);
-  c->next_attempt = now;
-  c->backoff_delta = gpr_time_from_seconds(1, GPR_TIMESPAN);
-
+  c->backoff_delta = gpr_time_from_seconds(
+      GRPC_SUBCHANNEL_INITIAL_CONNECT_BACKOFF_SECONDS, GPR_TIMESPAN);
+  c->next_attempt =
+      gpr_time_add(gpr_now(GPR_CLOCK_MONOTONIC), c->backoff_delta);
   continue_connect(c);
 }
 
 static void continue_creating_call(void *arg, int iomgr_success) {
   waiting_for_connect *w4c = arg;
+  grpc_subchannel_del_interested_party(w4c->subchannel, w4c->pollset);
   grpc_subchannel_create_call(w4c->subchannel, w4c->pollset, w4c->target,
                               w4c->notify);
   GRPC_SUBCHANNEL_UNREF(w4c->subchannel, "waiting_for_connect");
@@ -341,9 +362,10 @@ void grpc_subchannel_create_call(grpc_subchannel *c, grpc_pollset *pollset,
     grpc_subchannel_add_interested_party(c, pollset);
     if (!c->connecting) {
       c->connecting = 1;
-      connectivity_state_changed_locked(c);
+      connectivity_state_changed_locked(c, "create_call");
       /* released by connection */
       SUBCHANNEL_REF_LOCKED(c, "connecting");
+      GRPC_CHANNEL_INTERNAL_REF(c->master, "connecting");
       gpr_mu_unlock(&c->mu);
 
       start_connect(c);
@@ -372,7 +394,8 @@ void grpc_subchannel_notify_on_state_change(grpc_subchannel *c,
     c->connecting = 1;
     /* released by connection */
     SUBCHANNEL_REF_LOCKED(c, "connecting");
-    connectivity_state_changed_locked(c);
+    GRPC_CHANNEL_INTERNAL_REF(c->master, "connecting");
+    connectivity_state_changed_locked(c, "state_change");
   }
   gpr_mu_unlock(&c->mu);
   if (do_connect) {
@@ -388,7 +411,7 @@ void grpc_subchannel_process_transport_op(grpc_subchannel *c,
   gpr_mu_lock(&c->mu);
   if (op->disconnect) {
     c->disconnected = 1;
-    connectivity_state_changed_locked(c);
+    connectivity_state_changed_locked(c, "disconnect");
     if (c->have_alarm) {
       cancel_alarm = 1;
     }
@@ -456,13 +479,15 @@ static void on_state_changed(void *p, int iomgr_success) {
         destroy_connection = sw->subchannel->active;
       }
       sw->subchannel->active = NULL;
-      grpc_connectivity_state_set(&c->state_tracker,
-                                  GRPC_CHANNEL_TRANSIENT_FAILURE);
+      grpc_connectivity_state_set(
+          &c->state_tracker, c->disconnected ? GRPC_CHANNEL_FATAL_FAILURE
+                                             : GRPC_CHANNEL_TRANSIENT_FAILURE,
+          "connection_failed");
       break;
   }
 
 done:
-  connectivity_state_changed_locked(c);
+  connectivity_state_changed_locked(c, "transport_state_changed");
   destroy = SUBCHANNEL_UNREF_LOCKED(c, "state_watcher");
   gpr_free(sw);
   gpr_mu_unlock(mu);
@@ -519,6 +544,8 @@ static void publish_transport(grpc_subchannel *c) {
     gpr_free(sw);
     gpr_free(filters);
     grpc_channel_stack_destroy(stk);
+    GRPC_CHANNEL_INTERNAL_UNREF(c->master, "connecting");
+    GRPC_SUBCHANNEL_UNREF(c, "connecting");
     return;
   }
 
@@ -536,14 +563,16 @@ static void publish_transport(grpc_subchannel *c) {
   memset(&op, 0, sizeof(op));
   op.connectivity_state = &sw->connectivity_state;
   op.on_connectivity_state_change = &sw->closure;
+  op.bind_pollset_set = c->pollset_set;
   SUBCHANNEL_REF_LOCKED(c, "state_watcher");
+  GRPC_CHANNEL_INTERNAL_UNREF(c->master, "connecting");
   GPR_ASSERT(!SUBCHANNEL_UNREF_LOCKED(c, "connecting"));
   elem =
       grpc_channel_stack_element(CHANNEL_STACK_FROM_CONNECTION(c->active), 0);
   elem->filter->start_transport_op(elem, &op);
 
   /* signal completion */
-  connectivity_state_changed_locked(c);
+  connectivity_state_changed_locked(c, "connected");
   while ((w4c = c->waiting)) {
     c->waiting = w4c->next;
     grpc_iomgr_add_callback(&w4c->continuation);
@@ -558,6 +587,35 @@ static void publish_transport(grpc_subchannel *c) {
   }
 }
 
+/* Generate a random number between 0 and 1. */
+static double generate_uniform_random_number(grpc_subchannel *c) {
+  c->random = (1103515245 * c->random + 12345) % ((gpr_uint32)1 << 31);
+  return c->random / (double)((gpr_uint32)1 << 31);
+}
+
+/* Update backoff_delta and next_attempt in subchannel */
+static void update_reconnect_parameters(grpc_subchannel *c) {
+  gpr_int32 backoff_delta_millis, jitter;
+  gpr_int32 max_backoff_millis =
+      GRPC_SUBCHANNEL_RECONNECT_MAX_BACKOFF_SECONDS * 1000;
+  double jitter_range;
+  backoff_delta_millis =
+      (gpr_int32)(gpr_time_to_millis(c->backoff_delta) *
+                  GRPC_SUBCHANNEL_RECONNECT_BACKOFF_MULTIPLIER);
+  if (backoff_delta_millis > max_backoff_millis) {
+    backoff_delta_millis = max_backoff_millis;
+  }
+  c->backoff_delta = gpr_time_from_millis(backoff_delta_millis, GPR_TIMESPAN);
+  c->next_attempt =
+      gpr_time_add(gpr_now(GPR_CLOCK_MONOTONIC), c->backoff_delta);
+
+  jitter_range = GRPC_SUBCHANNEL_RECONNECT_JITTER * backoff_delta_millis;
+  jitter =
+      (gpr_int32)((2 * generate_uniform_random_number(c) - 1) * jitter_range);
+  c->next_attempt =
+      gpr_time_add(c->next_attempt, gpr_time_from_millis(jitter, GPR_TIMESPAN));
+}
+
 static void on_alarm(void *arg, int iomgr_success) {
   grpc_subchannel *c = arg;
   gpr_mu_lock(&c->mu);
@@ -565,11 +623,13 @@ static void on_alarm(void *arg, int iomgr_success) {
   if (c->disconnected) {
     iomgr_success = 0;
   }
-  connectivity_state_changed_locked(c);
+  connectivity_state_changed_locked(c, "alarm");
   gpr_mu_unlock(&c->mu);
   if (iomgr_success) {
+    update_reconnect_parameters(c);
     continue_connect(c);
   } else {
+    GRPC_CHANNEL_INTERNAL_UNREF(c->master, "connecting");
     GRPC_SUBCHANNEL_UNREF(c, "connecting");
   }
 }
@@ -579,19 +639,25 @@ static void subchannel_connected(void *arg, int iomgr_success) {
   if (c->connecting_result.transport != NULL) {
     publish_transport(c);
   } else {
+    gpr_timespec now = gpr_now(GPR_CLOCK_MONOTONIC);
     gpr_mu_lock(&c->mu);
-    connectivity_state_changed_locked(c);
     GPR_ASSERT(!c->have_alarm);
     c->have_alarm = 1;
-    c->next_attempt = gpr_time_add(c->next_attempt, c->backoff_delta);
-    c->backoff_delta = gpr_time_add(c->backoff_delta, c->backoff_delta);
-    grpc_alarm_init(&c->alarm, c->next_attempt, on_alarm, c, gpr_now(GPR_CLOCK_MONOTONIC));
+    connectivity_state_changed_locked(c, "connect_failed");
+    grpc_alarm_init(&c->alarm, c->next_attempt, on_alarm, c, now);
     gpr_mu_unlock(&c->mu);
   }
 }
 
 static gpr_timespec compute_connect_deadline(grpc_subchannel *c) {
-  return gpr_time_add(c->next_attempt, c->backoff_delta);
+  gpr_timespec current_deadline =
+      gpr_time_add(c->next_attempt, c->backoff_delta);
+  gpr_timespec min_deadline = gpr_time_add(
+      gpr_now(GPR_CLOCK_MONOTONIC),
+      gpr_time_from_seconds(GRPC_SUBCHANNEL_MIN_CONNECT_TIMEOUT_SECONDS,
+                            GPR_TIMESPAN));
+  return gpr_time_cmp(current_deadline, min_deadline) > 0 ? current_deadline
+                                                          : min_deadline;
 }
 
 static grpc_connectivity_state compute_connectivity_locked(grpc_subchannel *c) {
@@ -610,9 +676,10 @@ static grpc_connectivity_state compute_connectivity_locked(grpc_subchannel *c) {
   return GRPC_CHANNEL_IDLE;
 }
 
-static void connectivity_state_changed_locked(grpc_subchannel *c) {
+static void connectivity_state_changed_locked(grpc_subchannel *c,
+                                              const char *reason) {
   grpc_connectivity_state current = compute_connectivity_locked(c);
-  grpc_connectivity_state_set(&c->state_tracker, current);
+  grpc_connectivity_state_set(&c->state_tracker, current, reason);
 }
 
 /*
@@ -640,6 +707,12 @@ void grpc_subchannel_call_unref(
   }
 }
 
+char *grpc_subchannel_call_get_peer(grpc_subchannel_call *call) {
+  grpc_call_stack *call_stack = SUBCHANNEL_CALL_TO_CALL_STACK(call);
+  grpc_call_element *top_elem = grpc_call_stack_element(call_stack, 0);
+  return top_elem->filter->get_peer(top_elem);
+}
+
 void grpc_subchannel_call_process_op(grpc_subchannel_call *call,
                                      grpc_transport_stream_op *op) {
   grpc_call_stack *call_stack = SUBCHANNEL_CALL_TO_CALL_STACK(call);
diff --git a/src/core/client_config/subchannel.h b/src/core/client_config/subchannel.h
index a23a623277..d1cd33b2af 100644
--- a/src/core/client_config/subchannel.h
+++ b/src/core/client_config/subchannel.h
@@ -100,6 +100,9 @@ void grpc_subchannel_del_interested_party(grpc_subchannel *channel,
 void grpc_subchannel_call_process_op(grpc_subchannel_call *subchannel_call,
                                      grpc_transport_stream_op *op);
 
+/** continue querying for peer */
+char *grpc_subchannel_call_get_peer(grpc_subchannel_call *subchannel_call);
+
 struct grpc_subchannel_args {
   /** Channel filters for this channel - wrapped factories will likely
       want to mutate this */
diff --git a/src/core/client_config/subchannel_factory_decorators/add_channel_arg.c b/src/core/client_config/subchannel_factory_decorators/add_channel_arg.c
new file mode 100644
index 0000000000..7dc6d99ebe
--- /dev/null
+++ b/src/core/client_config/subchannel_factory_decorators/add_channel_arg.c
@@ -0,0 +1,43 @@
+/*
+ *
+ * Copyright 2015, Google Inc.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *
+ *     * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above
+ * copyright notice, this list of conditions and the following disclaimer
+ * in the documentation and/or other materials provided with the
+ * distribution.
+ *     * Neither the name of Google Inc. nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ */
+
+#include "src/core/client_config/subchannel_factory_decorators/add_channel_arg.h"
+#include "src/core/client_config/subchannel_factory_decorators/merge_channel_args.h"
+
+grpc_subchannel_factory *grpc_subchannel_factory_add_channel_arg(
+		grpc_subchannel_factory *input, const grpc_arg *arg) {
+	grpc_channel_args args;
+	args.num_args = 1;
+	args.args = (grpc_arg *)arg;
+	return grpc_subchannel_factory_merge_channel_args(input, &args);
+}
diff --git a/src/core/client_config/subchannel_factory_decorators/add_channel_arg.h b/src/core/client_config/subchannel_factory_decorators/add_channel_arg.h
new file mode 100644
index 0000000000..1937623374
--- /dev/null
+++ b/src/core/client_config/subchannel_factory_decorators/add_channel_arg.h
@@ -0,0 +1,45 @@
+/*
+ *
+ * Copyright 2015, Google Inc.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *
+ *     * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above
+ * copyright notice, this list of conditions and the following disclaimer
+ * in the documentation and/or other materials provided with the
+ * distribution.
+ *     * Neither the name of Google Inc. nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ */
+
+#ifndef GRPC_INTERNAL_CORE_CLIENT_CONFIG_SUBCHANNEL_FACTORY_DECORATORS_ADD_CHANNEL_ARG_H
+#define GRPC_INTERNAL_CORE_CLIENT_CONFIG_SUBCHANNEL_FACTORY_DECORATORS_ADD_CHANNEL_ARG_H
+
+#include "src/core/client_config/subchannel_factory.h"
+
+/** Takes a subchannel factory, returns a new one that mutates incoming
+    channel_args by adding a new argument; ownership of input, arg is retained
+    by the caller. */
+grpc_subchannel_factory *grpc_subchannel_factory_add_channel_arg(
+		grpc_subchannel_factory *input, const grpc_arg *arg);
+
+#endif /* GRPC_INTERNAL_CORE_CLIENT_CONFIG_SUBCHANNEL_FACTORY_DECORATORS_ADD_CHANNEL_ARG_H */
diff --git a/src/core/client_config/subchannel_factory_decorators/merge_channel_args.c b/src/core/client_config/subchannel_factory_decorators/merge_channel_args.c
new file mode 100644
index 0000000000..7e028857ac
--- /dev/null
+++ b/src/core/client_config/subchannel_factory_decorators/merge_channel_args.c
@@ -0,0 +1,84 @@
+/*
+ *
+ * Copyright 2015, Google Inc.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *
+ *     * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above
+ * copyright notice, this list of conditions and the following disclaimer
+ * in the documentation and/or other materials provided with the
+ * distribution.
+ *     * Neither the name of Google Inc. nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ */
+
+#include "src/core/client_config/subchannel_factory_decorators/merge_channel_args.h"
+#include <grpc/support/alloc.h>
+#include "src/core/channel/channel_args.h"
+
+typedef struct {
+  grpc_subchannel_factory base;
+  gpr_refcount refs;
+  grpc_subchannel_factory *wrapped;
+  grpc_channel_args *merge_args;
+} merge_args_factory;
+
+static void merge_args_factory_ref(grpc_subchannel_factory *scf) {
+  merge_args_factory *f = (merge_args_factory *)scf;
+  gpr_ref(&f->refs);
+}
+
+static void merge_args_factory_unref(grpc_subchannel_factory *scf) {
+  merge_args_factory *f = (merge_args_factory *)scf;
+  if (gpr_unref(&f->refs)) {
+  	grpc_subchannel_factory_unref(f->wrapped);
+    grpc_channel_args_destroy(f->merge_args);
+    gpr_free(f);
+  }
+}
+
+static grpc_subchannel *merge_args_factory_create_subchannel(
+    grpc_subchannel_factory *scf, grpc_subchannel_args *args) {
+  merge_args_factory *f = (merge_args_factory *)scf;
+  grpc_channel_args *final_args =
+      grpc_channel_args_merge(args->args, f->merge_args);
+  grpc_subchannel *s;
+  args->args = final_args;
+  s = grpc_subchannel_factory_create_subchannel(f->wrapped, args);
+  grpc_channel_args_destroy(final_args);
+  return s;
+}
+
+static const grpc_subchannel_factory_vtable merge_args_factory_vtable = {
+    merge_args_factory_ref, merge_args_factory_unref,
+    merge_args_factory_create_subchannel};
+
+grpc_subchannel_factory *grpc_subchannel_factory_merge_channel_args(
+		grpc_subchannel_factory *input, const grpc_channel_args *args) {
+  merge_args_factory *f = gpr_malloc(sizeof(*f));
+  f->base.vtable = &merge_args_factory_vtable;
+  gpr_ref_init(&f->refs, 1);
+  grpc_subchannel_factory_ref(input);
+  f->wrapped = input;
+  f->merge_args = grpc_channel_args_copy(args);
+  return &f->base;
+}
diff --git a/src/core/client_config/subchannel_factory_decorators/merge_channel_args.h b/src/core/client_config/subchannel_factory_decorators/merge_channel_args.h
new file mode 100644
index 0000000000..73a03b752f
--- /dev/null
+++ b/src/core/client_config/subchannel_factory_decorators/merge_channel_args.h
@@ -0,0 +1,45 @@
+/*
+ *
+ * Copyright 2015, Google Inc.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *
+ *     * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above
+ * copyright notice, this list of conditions and the following disclaimer
+ * in the documentation and/or other materials provided with the
+ * distribution.
+ *     * Neither the name of Google Inc. nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ */
+
+#ifndef GRPC_INTERNAL_CORE_CLIENT_CONFIG_SUBCHANNEL_FACTORY_DECORATORS_MERGE_CHANNEL_ARGS_H
+#define GRPC_INTERNAL_CORE_CLIENT_CONFIG_SUBCHANNEL_FACTORY_DECORATORS_MERGE_CHANNEL_ARGS_H
+
+#include "src/core/client_config/subchannel_factory.h"
+
+/** Takes a subchannel factory, returns a new one that mutates incoming
+    channel_args by adding a new argument; ownership of input, args is retained
+    by the caller. */
+grpc_subchannel_factory *grpc_subchannel_factory_merge_channel_args(
+		grpc_subchannel_factory *input, const grpc_channel_args *args);
+
+#endif /* GRPC_INTERNAL_CORE_CLIENT_CONFIG_SUBCHANNEL_FACTORY_DECORATORS_MERGE_CHANNEL_ARGS_H */
diff --git a/src/core/httpcli/httpcli.c b/src/core/httpcli/httpcli.c
index 65997d5f44..9012070e8e 100644
--- a/src/core/httpcli/httpcli.c
+++ b/src/core/httpcli/httpcli.c
@@ -40,9 +40,7 @@
 #include "src/core/iomgr/resolve_address.h"
 #include "src/core/iomgr/tcp_client.h"
 #include "src/core/httpcli/format_request.h"
-#include "src/core/httpcli/httpcli_security_connector.h"
 #include "src/core/httpcli/parser.h"
-#include "src/core/security/secure_transport_setup.h"
 #include "src/core/support/string.h"
 #include <grpc/support/alloc.h>
 #include <grpc/support/log.h>
@@ -57,7 +55,7 @@ typedef struct {
   char *host;
   gpr_timespec deadline;
   int have_read_byte;
-  int use_ssl;
+  const grpc_httpcli_handshaker *handshaker;
   grpc_httpcli_response_cb on_response;
   void *user_data;
   grpc_httpcli_context *context;
@@ -68,6 +66,16 @@ typedef struct {
 static grpc_httpcli_get_override g_get_override = NULL;
 static grpc_httpcli_post_override g_post_override = NULL;
 
+static void plaintext_handshake(void *arg, grpc_endpoint *endpoint,
+                                const char *host,
+                                void (*on_done)(void *arg,
+                                                grpc_endpoint *endpoint)) {
+  on_done(arg, endpoint);
+}
+
+const grpc_httpcli_handshaker grpc_httpcli_plaintext = {"http",
+                                                        plaintext_handshake};
+
 void grpc_httpcli_context_init(grpc_httpcli_context *context) {
   grpc_pollset_set_init(&context->pollset_set);
 }
@@ -163,18 +171,16 @@ static void start_write(internal_request *req) {
   }
 }
 
-static void on_secure_transport_setup_done(void *rp,
-                                           grpc_security_status status,
-                                           grpc_endpoint *wrapped_endpoint,
-                                           grpc_endpoint *secure_endpoint) {
-  internal_request *req = rp;
-  if (status != GRPC_SECURITY_OK) {
-    gpr_log(GPR_ERROR, "Secure transport setup failed with error %d.", status);
-    finish(req, 0);
-  } else {
-    req->ep = secure_endpoint;
-    start_write(req);
+static void on_handshake_done(void *arg, grpc_endpoint *ep) {
+  internal_request *req = arg;
+
+  if (!ep) {
+    next_address(req);
+    return;
   }
+
+  req->ep = ep;
+  start_write(req);
 }
 
 static void on_connected(void *arg, grpc_endpoint *tcp) {
@@ -184,25 +190,7 @@ static void on_connected(void *arg, grpc_endpoint *tcp) {
     next_address(req);
     return;
   }
-  req->ep = tcp;
-  if (req->use_ssl) {
-    grpc_channel_security_connector *sc = NULL;
-    const unsigned char *pem_root_certs = NULL;
-    size_t pem_root_certs_size = grpc_get_default_ssl_roots(&pem_root_certs);
-    if (pem_root_certs == NULL || pem_root_certs_size == 0) {
-      gpr_log(GPR_ERROR, "Could not get default pem root certs.");
-      finish(req, 0);
-      return;
-    }
-    GPR_ASSERT(grpc_httpcli_ssl_channel_security_connector_create(
-                   pem_root_certs, pem_root_certs_size, req->host, &sc) ==
-               GRPC_SECURITY_OK);
-    grpc_setup_secure_transport(&sc->base, tcp, on_secure_transport_setup_done,
-                                req);
-    GRPC_SECURITY_CONNECTOR_UNREF(&sc->base, "httpcli");
-  } else {
-    start_write(req);
-  }
+  req->handshaker->handshake(req, tcp, req->host, on_handshake_done);
 }
 
 static void next_address(internal_request *req) {
@@ -245,18 +233,17 @@ void grpc_httpcli_get(grpc_httpcli_context *context, grpc_pollset *pollset,
   req->on_response = on_response;
   req->user_data = user_data;
   req->deadline = deadline;
-  req->use_ssl = request->use_ssl;
+  req->handshaker =
+      request->handshaker ? request->handshaker : &grpc_httpcli_plaintext;
   req->context = context;
   req->pollset = pollset;
   gpr_asprintf(&name, "HTTP:GET:%s:%s", request->host, request->path);
   grpc_iomgr_register_object(&req->iomgr_obj, name);
   gpr_free(name);
-  if (req->use_ssl) {
-    req->host = gpr_strdup(request->host);
-  }
+  req->host = gpr_strdup(request->host);
 
   grpc_pollset_set_add_pollset(&req->context->pollset_set, req->pollset);
-  grpc_resolve_address(request->host, req->use_ssl ? "https" : "http",
+  grpc_resolve_address(request->host, req->handshaker->default_port,
                        on_resolved, req);
 }
 
@@ -279,18 +266,17 @@ void grpc_httpcli_post(grpc_httpcli_context *context, grpc_pollset *pollset,
   req->on_response = on_response;
   req->user_data = user_data;
   req->deadline = deadline;
-  req->use_ssl = request->use_ssl;
+  req->handshaker =
+      request->handshaker ? request->handshaker : &grpc_httpcli_plaintext;
   req->context = context;
   req->pollset = pollset;
   gpr_asprintf(&name, "HTTP:GET:%s:%s", request->host, request->path);
   grpc_iomgr_register_object(&req->iomgr_obj, name);
   gpr_free(name);
-  if (req->use_ssl) {
-    req->host = gpr_strdup(request->host);
-  }
+  req->host = gpr_strdup(request->host);
 
   grpc_pollset_set_add_pollset(&req->context->pollset_set, req->pollset);
-  grpc_resolve_address(request->host, req->use_ssl ? "https" : "http",
+  grpc_resolve_address(request->host, req->handshaker->default_port,
                        on_resolved, req);
 }
 
diff --git a/src/core/httpcli/httpcli.h b/src/core/httpcli/httpcli.h
index ab98178f8a..c45966714c 100644
--- a/src/core/httpcli/httpcli.h
+++ b/src/core/httpcli/httpcli.h
@@ -38,6 +38,7 @@
 
 #include <grpc/support/time.h>
 
+#include "src/core/iomgr/endpoint.h"
 #include "src/core/iomgr/pollset_set.h"
 
 /* User agent this library reports */
@@ -58,6 +59,15 @@ typedef struct grpc_httpcli_context {
   grpc_pollset_set pollset_set;
 } grpc_httpcli_context;
 
+typedef struct {
+  const char *default_port;
+  void (*handshake)(void *arg, grpc_endpoint *endpoint, const char *host,
+                    void (*on_done)(void *arg, grpc_endpoint *endpoint));
+} grpc_httpcli_handshaker;
+
+extern const grpc_httpcli_handshaker grpc_httpcli_plaintext;
+extern const grpc_httpcli_handshaker grpc_httpcli_ssl;
+
 /* A request */
 typedef struct grpc_httpcli_request {
   /* The host name to connect to */
@@ -69,8 +79,8 @@ typedef struct grpc_httpcli_request {
        Host, Connection, User-Agent */
   size_t hdr_count;
   grpc_httpcli_header *hdrs;
-  /* whether to use ssl for the request */
-  int use_ssl;
+  /* handshaker to use ssl for the request */
+  const grpc_httpcli_handshaker *handshaker;
 } grpc_httpcli_request;
 
 /* A response */
diff --git a/src/core/httpcli/httpcli_security_connector.c b/src/core/httpcli/httpcli_security_connector.c
index ce0d3d5a70..7887f9d530 100644
--- a/src/core/httpcli/httpcli_security_connector.c
+++ b/src/core/httpcli/httpcli_security_connector.c
@@ -31,7 +31,7 @@
  *
  */
 
-#include "src/core/httpcli/httpcli_security_connector.h"
+#include "src/core/httpcli/httpcli.h"
 
 #include <string.h>
 
@@ -96,7 +96,7 @@ static grpc_security_status httpcli_ssl_check_peer(grpc_security_connector *sc,
 static grpc_security_connector_vtable httpcli_ssl_vtable = {
     httpcli_ssl_destroy, httpcli_ssl_create_handshaker, httpcli_ssl_check_peer};
 
-grpc_security_status grpc_httpcli_ssl_channel_security_connector_create(
+static grpc_security_status httpcli_ssl_channel_security_connector_create(
     const unsigned char *pem_root_certs, size_t pem_root_certs_size,
     const char *secure_peer_name, grpc_channel_security_connector **sc) {
   tsi_result result = TSI_OK;
@@ -130,3 +130,48 @@ grpc_security_status grpc_httpcli_ssl_channel_security_connector_create(
   *sc = &c->base;
   return GRPC_SECURITY_OK;
 }
+
+/* handshaker */
+
+typedef struct {
+  void (*func)(void *arg, grpc_endpoint *endpoint);
+  void *arg;
+} on_done_closure;
+
+static void on_secure_transport_setup_done(void *rp,
+                                           grpc_security_status status,
+                                           grpc_endpoint *wrapped_endpoint,
+                                           grpc_endpoint *secure_endpoint) {
+  on_done_closure *c = rp;
+  if (status != GRPC_SECURITY_OK) {
+    gpr_log(GPR_ERROR, "Secure transport setup failed with error %d.", status);
+    c->func(c->arg, NULL);
+  } else {
+    c->func(c->arg, secure_endpoint);
+  }
+  gpr_free(c);
+}
+
+static void ssl_handshake(void *arg, grpc_endpoint *tcp, const char *host,
+                          void (*on_done)(void *arg, grpc_endpoint *endpoint)) {
+  grpc_channel_security_connector *sc = NULL;
+  const unsigned char *pem_root_certs = NULL;
+  on_done_closure *c = gpr_malloc(sizeof(*c));
+  size_t pem_root_certs_size = grpc_get_default_ssl_roots(&pem_root_certs);
+  if (pem_root_certs == NULL || pem_root_certs_size == 0) {
+    gpr_log(GPR_ERROR, "Could not get default pem root certs.");
+    on_done(arg, NULL);
+    gpr_free(c);
+    return;
+  }
+  c->func = on_done;
+  c->arg = arg;
+  GPR_ASSERT(httpcli_ssl_channel_security_connector_create(
+                 pem_root_certs, pem_root_certs_size, host, &sc) ==
+             GRPC_SECURITY_OK);
+  grpc_setup_secure_transport(&sc->base, tcp, on_secure_transport_setup_done,
+                              c);
+  GRPC_SECURITY_CONNECTOR_UNREF(&sc->base, "httpcli");
+}
+
+const grpc_httpcli_handshaker grpc_httpcli_ssl = {"https", ssl_handshake};
diff --git a/src/core/iomgr/alarm.c b/src/core/iomgr/alarm.c
index 931f746f75..68d33b9cf6 100644
--- a/src/core/iomgr/alarm.c
+++ b/src/core/iomgr/alarm.c
@@ -361,7 +361,9 @@ static int run_some_expired_alarms(gpr_mu *drop_mu, gpr_timespec now,
 
 int grpc_alarm_check(gpr_mu *drop_mu, gpr_timespec now, gpr_timespec *next) {
   GPR_ASSERT(now.clock_type == g_clock_type);
-  return run_some_expired_alarms(drop_mu, now, next, 1);
+  return run_some_expired_alarms(
+      drop_mu, now, next, 
+      gpr_time_cmp(now, gpr_inf_future(now.clock_type)) != 0);
 }
 
 gpr_timespec grpc_alarm_list_next_timeout(void) {
diff --git a/src/core/iomgr/endpoint.c b/src/core/iomgr/endpoint.c
index 96487958a7..744fe7656c 100644
--- a/src/core/iomgr/endpoint.c
+++ b/src/core/iomgr/endpoint.c
@@ -50,6 +50,14 @@ void grpc_endpoint_add_to_pollset(grpc_endpoint *ep, grpc_pollset *pollset) {
   ep->vtable->add_to_pollset(ep, pollset);
 }
 
+void grpc_endpoint_add_to_pollset_set(grpc_endpoint *ep, grpc_pollset_set *pollset_set) {
+  ep->vtable->add_to_pollset_set(ep, pollset_set);
+}
+
 void grpc_endpoint_shutdown(grpc_endpoint *ep) { ep->vtable->shutdown(ep); }
 
 void grpc_endpoint_destroy(grpc_endpoint *ep) { ep->vtable->destroy(ep); }
+
+char *grpc_endpoint_get_peer(grpc_endpoint *ep) {
+  return ep->vtable->get_peer(ep);
+}
diff --git a/src/core/iomgr/endpoint.h b/src/core/iomgr/endpoint.h
index 881e851800..a2216925f9 100644
--- a/src/core/iomgr/endpoint.h
+++ b/src/core/iomgr/endpoint.h
@@ -35,6 +35,7 @@
 #define GRPC_INTERNAL_CORE_IOMGR_ENDPOINT_H
 
 #include "src/core/iomgr/pollset.h"
+#include "src/core/iomgr/pollset_set.h"
 #include <grpc/support/slice.h>
 #include <grpc/support/time.h>
 
@@ -70,14 +71,18 @@ struct grpc_endpoint_vtable {
                                       size_t nslices, grpc_endpoint_write_cb cb,
                                       void *user_data);
   void (*add_to_pollset)(grpc_endpoint *ep, grpc_pollset *pollset);
+  void (*add_to_pollset_set)(grpc_endpoint *ep, grpc_pollset_set *pollset);
   void (*shutdown)(grpc_endpoint *ep);
   void (*destroy)(grpc_endpoint *ep);
+  char *(*get_peer)(grpc_endpoint *ep);
 };
 
 /* When data is available on the connection, calls the callback with slices. */
 void grpc_endpoint_notify_on_read(grpc_endpoint *ep, grpc_endpoint_read_cb cb,
                                   void *user_data);
 
+char *grpc_endpoint_get_peer(grpc_endpoint *ep);
+
 /* Write slices out to the socket.
 
    If the connection is ready for more data after the end of the call, it
@@ -98,6 +103,7 @@ void grpc_endpoint_destroy(grpc_endpoint *ep);
 /* Add an endpoint to a pollset, so that when the pollset is polled, events from
    this endpoint are considered */
 void grpc_endpoint_add_to_pollset(grpc_endpoint *ep, grpc_pollset *pollset);
+void grpc_endpoint_add_to_pollset_set(grpc_endpoint *ep, grpc_pollset_set *pollset_set);
 
 struct grpc_endpoint {
   const grpc_endpoint_vtable *vtable;
diff --git a/src/core/iomgr/endpoint_pair_posix.c b/src/core/iomgr/endpoint_pair_posix.c
index fa2d2555d6..deae9c6875 100644
--- a/src/core/iomgr/endpoint_pair_posix.c
+++ b/src/core/iomgr/endpoint_pair_posix.c
@@ -66,12 +66,12 @@ grpc_endpoint_pair grpc_iomgr_create_endpoint_pair(const char *name,
   create_sockets(sv);
 
   gpr_asprintf(&final_name, "%s:client", name);
-  p.client =
-      grpc_tcp_create(grpc_fd_create(sv[1], final_name), read_slice_size);
+  p.client = grpc_tcp_create(grpc_fd_create(sv[1], final_name), read_slice_size,
+                             "socketpair-server");
   gpr_free(final_name);
   gpr_asprintf(&final_name, "%s:server", name);
-  p.server =
-      grpc_tcp_create(grpc_fd_create(sv[0], final_name), read_slice_size);
+  p.server = grpc_tcp_create(grpc_fd_create(sv[0], final_name), read_slice_size,
+                             "socketpair-client");
   gpr_free(final_name);
   return p;
 }
diff --git a/src/core/iomgr/endpoint_pair_windows.c b/src/core/iomgr/endpoint_pair_windows.c
index c6790b2937..e8295df8b3 100644
--- a/src/core/iomgr/endpoint_pair_windows.c
+++ b/src/core/iomgr/endpoint_pair_windows.c
@@ -81,8 +81,10 @@ grpc_endpoint_pair grpc_iomgr_create_endpoint_pair(const char *name, size_t read
   SOCKET sv[2];
   grpc_endpoint_pair p;
   create_sockets(sv);
-  p.client = grpc_tcp_create(grpc_winsocket_create(sv[1], "endpoint:client"));
-  p.server = grpc_tcp_create(grpc_winsocket_create(sv[0], "endpoint:server"));
+  p.client = grpc_tcp_create(grpc_winsocket_create(sv[1], "endpoint:client"),
+                             "endpoint:server");
+  p.server = grpc_tcp_create(grpc_winsocket_create(sv[0], "endpoint:server"),
+                             "endpoint:client");
   return p;
 }
 
diff --git a/src/core/iomgr/fd_posix.c b/src/core/iomgr/fd_posix.c
index 6ad377ce1c..2d08a77a70 100644
--- a/src/core/iomgr/fd_posix.c
+++ b/src/core/iomgr/fd_posix.c
@@ -102,6 +102,7 @@ static grpc_fd *alloc_fd(int fd) {
   r->freelist_next = NULL;
   r->read_watcher = r->write_watcher = NULL;
   r->on_done_closure = NULL;
+  r->closed = 0;
   return r;
 }
 
@@ -167,13 +168,19 @@ int grpc_fd_is_orphaned(grpc_fd *fd) {
   return (gpr_atm_acq_load(&fd->refst) & 1) == 0;
 }
 
+static void pollset_kick_locked(grpc_pollset *pollset) {
+  gpr_mu_lock(GRPC_POLLSET_MU(pollset));
+  grpc_pollset_kick(pollset, NULL);
+  gpr_mu_unlock(GRPC_POLLSET_MU(pollset));
+}
+
 static void maybe_wake_one_watcher_locked(grpc_fd *fd) {
   if (fd->inactive_watcher_root.next != &fd->inactive_watcher_root) {
-    grpc_pollset_force_kick(fd->inactive_watcher_root.next->pollset);
+    pollset_kick_locked(fd->inactive_watcher_root.next->pollset);
   } else if (fd->read_watcher) {
-    grpc_pollset_force_kick(fd->read_watcher->pollset);
+    pollset_kick_locked(fd->read_watcher->pollset);
   } else if (fd->write_watcher) {
-    grpc_pollset_force_kick(fd->write_watcher->pollset);
+    pollset_kick_locked(fd->write_watcher->pollset);
   }
 }
 
@@ -187,13 +194,13 @@ static void wake_all_watchers_locked(grpc_fd *fd) {
   grpc_fd_watcher *watcher;
   for (watcher = fd->inactive_watcher_root.next;
        watcher != &fd->inactive_watcher_root; watcher = watcher->next) {
-    grpc_pollset_force_kick(watcher->pollset);
+    pollset_kick_locked(watcher->pollset);
   }
   if (fd->read_watcher) {
-    grpc_pollset_force_kick(fd->read_watcher->pollset);
+    pollset_kick_locked(fd->read_watcher->pollset);
   }
   if (fd->write_watcher && fd->write_watcher != fd->read_watcher) {
-    grpc_pollset_force_kick(fd->write_watcher->pollset);
+    pollset_kick_locked(fd->write_watcher->pollset);
   }
 }
 
@@ -209,6 +216,8 @@ void grpc_fd_orphan(grpc_fd *fd, grpc_iomgr_closure *on_done,
   REF_BY(fd, 1, reason); /* remove active status, but keep referenced */
   gpr_mu_lock(&fd->watcher_mu);
   if (!has_watchers(fd)) {
+    GPR_ASSERT(!fd->closed);
+    fd->closed = 1;
     close(fd->fd);
     if (fd->on_done_closure) {
       grpc_iomgr_add_callback(fd->on_done_closure);
@@ -373,13 +382,15 @@ gpr_uint32 grpc_fd_begin_poll(grpc_fd *fd, grpc_pollset *pollset,
     return 0;
   }
   /* if there is nobody polling for read, but we need to, then start doing so */
-  if (read_mask && !fd->read_watcher && gpr_atm_acq_load(&fd->readst) > READY) {
+  if (read_mask && !fd->read_watcher &&
+      (gpr_uintptr)gpr_atm_acq_load(&fd->readst) > READY) {
     fd->read_watcher = watcher;
     mask |= read_mask;
   }
   /* if there is nobody polling for write, but we need to, then start doing so
    */
-  if (write_mask && !fd->write_watcher && gpr_atm_acq_load(&fd->writest) > READY) {
+  if (write_mask && !fd->write_watcher &&
+      (gpr_uintptr)gpr_atm_acq_load(&fd->writest) > READY) {
     fd->write_watcher = watcher;
     mask |= write_mask;
   }
@@ -426,7 +437,8 @@ void grpc_fd_end_poll(grpc_fd_watcher *watcher, int got_read, int got_write) {
   if (kick) {
     maybe_wake_one_watcher_locked(fd);
   }
-  if (grpc_fd_is_orphaned(fd) && !has_watchers(fd)) {
+  if (grpc_fd_is_orphaned(fd) && !has_watchers(fd) && !fd->closed) {
+    fd->closed = 1;
     close(fd->fd);
     if (fd->on_done_closure != NULL) {
       grpc_iomgr_add_callback(fd->on_done_closure);
diff --git a/src/core/iomgr/fd_posix.h b/src/core/iomgr/fd_posix.h
index 94d0019fa4..835e9b339a 100644
--- a/src/core/iomgr/fd_posix.h
+++ b/src/core/iomgr/fd_posix.h
@@ -60,6 +60,7 @@ struct grpc_fd {
 
   gpr_mu set_state_mu;
   gpr_atm shutdown;
+  int closed;
 
   /* The watcher list.
 
@@ -108,7 +109,8 @@ grpc_fd *grpc_fd_create(int fd, const char *name);
    on_done is called when the underlying file descriptor is definitely close()d.
    If on_done is NULL, no callback will be made.
    Requires: *fd initialized; no outstanding notify_on_read or
-   notify_on_write. */
+   notify_on_write.
+   MUST NOT be called with a pollset lock taken */
 void grpc_fd_orphan(grpc_fd *fd, grpc_iomgr_closure *on_done,
                     const char *reason);
 
@@ -121,11 +123,13 @@ void grpc_fd_orphan(grpc_fd *fd, grpc_iomgr_closure *on_done,
    i.e. a combination of read_mask and write_mask determined by the fd's current
    interest in said events.
    Polling strategies that do not need to alter their behavior depending on the
-   fd's current interest (such as epoll) do not need to call this function. */
+   fd's current interest (such as epoll) do not need to call this function.
+   MUST NOT be called with a pollset lock taken */
 gpr_uint32 grpc_fd_begin_poll(grpc_fd *fd, grpc_pollset *pollset,
                               gpr_uint32 read_mask, gpr_uint32 write_mask,
                               grpc_fd_watcher *rec);
-/* Complete polling previously started with grpc_fd_begin_poll */
+/* Complete polling previously started with grpc_fd_begin_poll
+   MUST NOT be called with a pollset lock taken */
 void grpc_fd_end_poll(grpc_fd_watcher *rec, int got_read, int got_write);
 
 /* Return 1 if this fd is orphaned, 0 otherwise */
diff --git a/src/core/iomgr/iomgr.c b/src/core/iomgr/iomgr.c
index a18c176b30..fdc9adf4af 100644
--- a/src/core/iomgr/iomgr.c
+++ b/src/core/iomgr/iomgr.c
@@ -88,6 +88,7 @@ void grpc_kick_poller(void) {
 
 void grpc_iomgr_init(void) {
   gpr_thd_id id;
+  g_shutdown = 0;
   gpr_mu_init(&g_mu);
   gpr_cv_init(&g_rcv);
   grpc_alarm_list_init(gpr_now(GPR_CLOCK_MONOTONIC));
@@ -146,7 +147,6 @@ void grpc_iomgr_shutdown(void) {
       continue;
     }
     if (grpc_alarm_check(&g_mu, gpr_inf_future(GPR_CLOCK_MONOTONIC), NULL)) {
-      gpr_log(GPR_DEBUG, "got late alarm");
       continue;
     }
     if (g_root_object.next != &g_root_object) {
diff --git a/src/core/iomgr/pollset.h b/src/core/iomgr/pollset.h
index c40188b3c9..c474e4dbf1 100644
--- a/src/core/iomgr/pollset.h
+++ b/src/core/iomgr/pollset.h
@@ -37,6 +37,8 @@
 #include <grpc/support/port_platform.h>
 #include <grpc/support/time.h>
 
+#define GRPC_POLLSET_KICK_BROADCAST ((grpc_pollset_worker *)1)
+
 /* A grpc_pollset is a set of file descriptors that a higher level item is
    interested in. For example:
     - a server will typically keep a pollset containing all connected channels,
@@ -63,13 +65,24 @@ void grpc_pollset_destroy(grpc_pollset *pollset);
    descriptors.
    Requires GRPC_POLLSET_MU(pollset) locked.
    May unlock GRPC_POLLSET_MU(pollset) during its execution.
-   
+
+   worker is a (platform-specific) handle that can be used to wake up
+   from grpc_pollset_work before any events are received and before the timeout
+   has expired. It is both initialized and destroyed by grpc_pollset_work.
+   Initialization of worker is guaranteed to occur BEFORE the
+   GRPC_POLLSET_MU(pollset) is released for the first time by
+   grpc_pollset_work, and it is guaranteed that GRPC_POLLSET_MU(pollset) will
+   not be released by grpc_pollset_work AFTER worker has been destroyed.
+
    Returns true if some work has been done, and false if the deadline
-   got attained. */
-int grpc_pollset_work(grpc_pollset *pollset, gpr_timespec deadline);
+   expired. */
+int grpc_pollset_work(grpc_pollset *pollset, grpc_pollset_worker *worker,
+                      gpr_timespec deadline);
 
 /* Break one polling thread out of polling work for this pollset.
-   Requires GRPC_POLLSET_MU(pollset) locked. */
-void grpc_pollset_kick(grpc_pollset *pollset);
+   If specific_worker is GRPC_POLLSET_KICK_BROADCAST, kick ALL the workers.
+   Otherwise, if specific_worker is non-NULL, then kick that worker. */
+void grpc_pollset_kick(grpc_pollset *pollset,
+                       grpc_pollset_worker *specific_worker);
 
 #endif /* GRPC_INTERNAL_CORE_IOMGR_POLLSET_H */
diff --git a/src/core/iomgr/pollset_kick_posix.c b/src/core/iomgr/pollset_kick_posix.c
deleted file mode 100644
index 51021784f2..0000000000
--- a/src/core/iomgr/pollset_kick_posix.c
+++ /dev/null
@@ -1,168 +0,0 @@
-/*
- *
- * Copyright 2015, Google Inc.
- * All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions are
- * met:
- *
- *     * Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- *     * Redistributions in binary form must reproduce the above
- * copyright notice, this list of conditions and the following disclaimer
- * in the documentation and/or other materials provided with the
- * distribution.
- *     * Neither the name of Google Inc. nor the names of its
- * contributors may be used to endorse or promote products derived from
- * this software without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
- * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
- * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
- * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
- * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
- * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
- * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
- * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
- * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
- * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
- * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
- *
- */
-
-#include <grpc/support/port_platform.h>
-
-#ifdef GPR_POSIX_SOCKET
-#include "src/core/iomgr/pollset_kick_posix.h"
-
-#include <errno.h>
-#include <string.h>
-#include <unistd.h>
-
-#include "src/core/iomgr/socket_utils_posix.h"
-#include "src/core/iomgr/wakeup_fd_posix.h"
-#include <grpc/support/alloc.h>
-#include <grpc/support/log.h>
-
-/* This implementation is based on a freelist of wakeup fds, with extra logic to
- * handle kicks while there is no attached fd. */
-
-/* TODO(klempner): Autosize this, and consider providing a way to disable the
- * cap entirely on systems with large fd limits */
-#define GRPC_MAX_CACHED_WFDS 50
-
-static grpc_kick_fd_info *fd_freelist = NULL;
-static int fd_freelist_count = 0;
-static gpr_mu fd_freelist_mu;
-
-static grpc_kick_fd_info *allocate_wfd(void) {
-  grpc_kick_fd_info *info = NULL;
-  gpr_mu_lock(&fd_freelist_mu);
-  if (fd_freelist != NULL) {
-    info = fd_freelist;
-    fd_freelist = fd_freelist->next;
-    --fd_freelist_count;
-  }
-  gpr_mu_unlock(&fd_freelist_mu);
-  if (info == NULL) {
-    info = gpr_malloc(sizeof(*info));
-    grpc_wakeup_fd_create(&info->wakeup_fd);
-    info->next = NULL;
-  }
-  return info;
-}
-
-static void destroy_wfd(grpc_kick_fd_info *wfd) {
-  grpc_wakeup_fd_destroy(&wfd->wakeup_fd);
-  gpr_free(wfd);
-}
-
-static void free_wfd(grpc_kick_fd_info *fd_info) {
-  gpr_mu_lock(&fd_freelist_mu);
-  if (fd_freelist_count < GRPC_MAX_CACHED_WFDS) {
-    fd_info->next = fd_freelist;
-    fd_freelist = fd_info;
-    fd_freelist_count++;
-    fd_info = NULL;
-  }
-  gpr_mu_unlock(&fd_freelist_mu);
-
-  if (fd_info) {
-    destroy_wfd(fd_info);
-  }
-}
-
-void grpc_pollset_kick_init(grpc_pollset_kick_state *kick_state) {
-  gpr_mu_init(&kick_state->mu);
-  kick_state->kicked = 0;
-  kick_state->fd_list.next = kick_state->fd_list.prev = &kick_state->fd_list;
-}
-
-void grpc_pollset_kick_destroy(grpc_pollset_kick_state *kick_state) {
-  gpr_mu_destroy(&kick_state->mu);
-  GPR_ASSERT(kick_state->fd_list.next == &kick_state->fd_list);
-}
-
-grpc_kick_fd_info *grpc_pollset_kick_pre_poll(
-    grpc_pollset_kick_state *kick_state) {
-  grpc_kick_fd_info *fd_info;
-  gpr_mu_lock(&kick_state->mu);
-  if (kick_state->kicked) {
-    kick_state->kicked = 0;
-    gpr_mu_unlock(&kick_state->mu);
-    return NULL;
-  }
-  fd_info = allocate_wfd();
-  fd_info->next = &kick_state->fd_list;
-  fd_info->prev = fd_info->next->prev;
-  fd_info->next->prev = fd_info->prev->next = fd_info;
-  gpr_mu_unlock(&kick_state->mu);
-  return fd_info;
-}
-
-void grpc_pollset_kick_consume(grpc_pollset_kick_state *kick_state,
-                               grpc_kick_fd_info *fd_info) {
-  grpc_wakeup_fd_consume_wakeup(&fd_info->wakeup_fd);
-}
-
-void grpc_pollset_kick_post_poll(grpc_pollset_kick_state *kick_state,
-                                 grpc_kick_fd_info *fd_info) {
-  gpr_mu_lock(&kick_state->mu);
-  fd_info->next->prev = fd_info->prev;
-  fd_info->prev->next = fd_info->next;
-  free_wfd(fd_info);
-  gpr_mu_unlock(&kick_state->mu);
-}
-
-void grpc_pollset_kick_kick(grpc_pollset_kick_state *kick_state) {
-  gpr_mu_lock(&kick_state->mu);
-  if (kick_state->fd_list.next != &kick_state->fd_list) {
-    grpc_wakeup_fd_wakeup(&kick_state->fd_list.next->wakeup_fd);
-  } else {
-    kick_state->kicked = 1;
-  }
-  gpr_mu_unlock(&kick_state->mu);
-}
-
-void grpc_pollset_kick_global_init_fallback_fd(void) {
-  gpr_mu_init(&fd_freelist_mu);
-  grpc_wakeup_fd_global_init_force_fallback();
-}
-
-void grpc_pollset_kick_global_init(void) {
-  gpr_mu_init(&fd_freelist_mu);
-  grpc_wakeup_fd_global_init();
-}
-
-void grpc_pollset_kick_global_destroy(void) {
-  while (fd_freelist != NULL) {
-    grpc_kick_fd_info *current = fd_freelist;
-    fd_freelist = fd_freelist->next;
-    destroy_wfd(current);
-  }
-  grpc_wakeup_fd_global_destroy();
-  gpr_mu_destroy(&fd_freelist_mu);
-}
-
-#endif /* GPR_POSIX_SOCKET */
diff --git a/src/core/iomgr/pollset_kick_posix.h b/src/core/iomgr/pollset_kick_posix.h
deleted file mode 100644
index 77e32a8d51..0000000000
--- a/src/core/iomgr/pollset_kick_posix.h
+++ /dev/null
@@ -1,93 +0,0 @@
-/*
- *
- * Copyright 2015, Google Inc.
- * All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions are
- * met:
- *
- *     * Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- *     * Redistributions in binary form must reproduce the above
- * copyright notice, this list of conditions and the following disclaimer
- * in the documentation and/or other materials provided with the
- * distribution.
- *     * Neither the name of Google Inc. nor the names of its
- * contributors may be used to endorse or promote products derived from
- * this software without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
- * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
- * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
- * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
- * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
- * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
- * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
- * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
- * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
- * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
- * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
- *
- */
-
-#ifndef GRPC_INTERNAL_CORE_IOMGR_POLLSET_KICK_POSIX_H
-#define GRPC_INTERNAL_CORE_IOMGR_POLLSET_KICK_POSIX_H
-
-#include "src/core/iomgr/wakeup_fd_posix.h"
-#include <grpc/support/sync.h>
-
-/* pollset kicking allows breaking a thread out of polling work for
-   a given pollset.
-   writing a byte to a pipe is used as a posix-ly portable base
-   mechanism, and eventfds are utilized on Linux for better performance. */
-
-typedef struct grpc_kick_fd_info {
-  grpc_wakeup_fd_info wakeup_fd;
-  /* used for polling list and free list */
-  struct grpc_kick_fd_info *next;
-  /* only used when polling */
-  struct grpc_kick_fd_info *prev;
-} grpc_kick_fd_info;
-
-typedef struct grpc_pollset_kick_state {
-  gpr_mu mu;
-  int kicked;
-  struct grpc_kick_fd_info fd_list;
-} grpc_pollset_kick_state;
-
-#define GRPC_POLLSET_KICK_GET_FD(kick_fd_info) \
-  GRPC_WAKEUP_FD_GET_READ_FD(&(kick_fd_info)->wakeup_fd)
-
-/* This is an abstraction around the typical pipe mechanism for waking up a
-   thread sitting in a poll() style call. */
-
-void grpc_pollset_kick_global_init(void);
-void grpc_pollset_kick_global_destroy(void);
-
-void grpc_pollset_kick_init(grpc_pollset_kick_state *kick_state);
-void grpc_pollset_kick_destroy(grpc_pollset_kick_state *kick_state);
-
-/* Guarantees a pure posix implementation rather than a specialized one, if
- * applicable. Intended for testing. */
-void grpc_pollset_kick_global_init_fallback_fd(void);
-
-/* Must be called before entering poll(). If return value is NULL, this consumed
-   an existing kick. Otherwise the return value is an FD to add to the poll set.
- */
-grpc_kick_fd_info *grpc_pollset_kick_pre_poll(
-    grpc_pollset_kick_state *kick_state);
-
-/* Consume an existing kick. Must be called after poll returns that the fd was
-   readable, and before calling kick_post_poll. */
-void grpc_pollset_kick_consume(grpc_pollset_kick_state *kick_state,
-                               grpc_kick_fd_info *fd_info);
-
-/* Must be called after pre_poll, and after consume if applicable */
-void grpc_pollset_kick_post_poll(grpc_pollset_kick_state *kick_state,
-                                 grpc_kick_fd_info *fd_info);
-
-/* Actually kick */
-void grpc_pollset_kick_kick(grpc_pollset_kick_state *kick_state);
-
-#endif /* GRPC_INTERNAL_CORE_IOMGR_POLLSET_KICK_POSIX_H */
diff --git a/src/core/iomgr/pollset_multipoller_with_epoll.c b/src/core/iomgr/pollset_multipoller_with_epoll.c
index d697b59e4c..1320c64579 100644
--- a/src/core/iomgr/pollset_multipoller_with_epoll.c
+++ b/src/core/iomgr/pollset_multipoller_with_epoll.c
@@ -36,6 +36,7 @@
 #ifdef GPR_LINUX_MULTIPOLL_WITH_EPOLL
 
 #include <errno.h>
+#include <poll.h>
 #include <string.h>
 #include <sys/epoll.h>
 #include <unistd.h>
@@ -44,23 +45,28 @@
 #include <grpc/support/alloc.h>
 #include <grpc/support/log.h>
 
+typedef struct wakeup_fd_hdl {
+  grpc_wakeup_fd wakeup_fd;
+  struct wakeup_fd_hdl *next;
+} wakeup_fd_hdl;
+
+typedef struct {
+  grpc_pollset *pollset;
+  grpc_fd *fd;
+  grpc_iomgr_closure closure;
+} delayed_add;
+
 typedef struct {
   int epoll_fd;
-  grpc_wakeup_fd_info wakeup_fd;
+  wakeup_fd_hdl *free_wakeup_fds;
 } pollset_hdr;
 
-static void multipoll_with_epoll_pollset_add_fd(grpc_pollset *pollset,
-                                                grpc_fd *fd,
-                                                int and_unlock_pollset) {
+static void finally_add_fd(grpc_pollset *pollset, grpc_fd *fd) {
   pollset_hdr *h = pollset->data.ptr;
   struct epoll_event ev;
   int err;
   grpc_fd_watcher watcher;
 
-  if (and_unlock_pollset) {
-    gpr_mu_unlock(&pollset->mu);
-  }
-
   /* We pretend to be polling whilst adding an fd to keep the fd from being
      closed during the add. This may result in a spurious wakeup being assigned
      to this pollset whilst adding, but that should be benign. */
@@ -80,6 +86,52 @@ static void multipoll_with_epoll_pollset_add_fd(grpc_pollset *pollset,
   grpc_fd_end_poll(&watcher, 0, 0);
 }
 
+static void perform_delayed_add(void *arg, int iomgr_status) {
+  delayed_add *da = arg;
+  int do_shutdown_cb = 0;
+
+  if (!grpc_fd_is_orphaned(da->fd)) {
+    finally_add_fd(da->pollset, da->fd);
+  }
+
+  gpr_mu_lock(&da->pollset->mu);
+  da->pollset->in_flight_cbs--;
+  if (da->pollset->shutting_down) {
+    /* We don't care about this pollset anymore. */
+    if (da->pollset->in_flight_cbs == 0 && !da->pollset->called_shutdown) {
+      GPR_ASSERT(!grpc_pollset_has_workers(da->pollset));
+      da->pollset->called_shutdown = 1;
+      do_shutdown_cb = 1;
+    }
+  }
+  gpr_mu_unlock(&da->pollset->mu);
+
+  GRPC_FD_UNREF(da->fd, "delayed_add");
+
+  if (do_shutdown_cb) {
+    da->pollset->shutdown_done_cb(da->pollset->shutdown_done_arg);
+  }
+
+  gpr_free(da);
+}
+
+static void multipoll_with_epoll_pollset_add_fd(grpc_pollset *pollset,
+                                                grpc_fd *fd,
+                                                int and_unlock_pollset) {
+  if (and_unlock_pollset) {
+    gpr_mu_unlock(&pollset->mu);
+    finally_add_fd(pollset, fd);
+  } else {
+    delayed_add *da = gpr_malloc(sizeof(*da));
+    da->pollset = pollset;
+    da->fd = fd;
+    GRPC_FD_REF(fd, "delayed_add");
+    grpc_iomgr_closure_init(&da->closure, perform_delayed_add, da);
+    pollset->in_flight_cbs++;
+    grpc_iomgr_add_callback(&da->closure);
+  }
+}
+
 static void multipoll_with_epoll_pollset_del_fd(grpc_pollset *pollset,
                                                 grpc_fd *fd,
                                                 int and_unlock_pollset) {
@@ -103,12 +155,14 @@ static void multipoll_with_epoll_pollset_del_fd(grpc_pollset *pollset,
 #define GRPC_EPOLL_MAX_EVENTS 1000
 
 static void multipoll_with_epoll_pollset_maybe_work(
-    grpc_pollset *pollset, gpr_timespec deadline, gpr_timespec now,
-    int allow_synchronous_callback) {
+    grpc_pollset *pollset, grpc_pollset_worker *worker, gpr_timespec deadline,
+    gpr_timespec now, int allow_synchronous_callback) {
   struct epoll_event ep_ev[GRPC_EPOLL_MAX_EVENTS];
   int ep_rv;
+  int poll_rv;
   pollset_hdr *h = pollset->data.ptr;
   int timeout_ms;
+  struct pollfd pfds[2];
 
   /* If you want to ignore epoll's ability to sanely handle parallel pollers,
    * for a more apples-to-apples performance comparison with poll, add a
@@ -116,43 +170,58 @@ static void multipoll_with_epoll_pollset_maybe_work(
    * here.
    */
 
-  pollset->counter += 1;
   gpr_mu_unlock(&pollset->mu);
 
   timeout_ms = grpc_poll_deadline_to_millis_timeout(deadline, now);
 
-  do {
-    ep_rv = epoll_wait(h->epoll_fd, ep_ev, GRPC_EPOLL_MAX_EVENTS, timeout_ms);
-    if (ep_rv < 0) {
-      if (errno != EINTR) {
-        gpr_log(GPR_ERROR, "epoll_wait() failed: %s", strerror(errno));
-      }
-    } else {
-      int i;
-      for (i = 0; i < ep_rv; ++i) {
-        if (ep_ev[i].data.ptr == 0) {
-          grpc_wakeup_fd_consume_wakeup(&h->wakeup_fd);
-        } else {
-          grpc_fd *fd = ep_ev[i].data.ptr;
-          /* TODO(klempner): We might want to consider making err and pri
-           * separate events */
-          int cancel = ep_ev[i].events & (EPOLLERR | EPOLLHUP);
-          int read = ep_ev[i].events & (EPOLLIN | EPOLLPRI);
-          int write = ep_ev[i].events & EPOLLOUT;
-          if (read || cancel) {
-            grpc_fd_become_readable(fd, allow_synchronous_callback);
+  pfds[0].fd = GRPC_WAKEUP_FD_GET_READ_FD(&worker->wakeup_fd);
+  pfds[0].events = POLLIN;
+  pfds[0].revents = 0;
+  pfds[1].fd = h->epoll_fd;
+  pfds[1].events = POLLIN;
+  pfds[1].revents = 0;
+
+  poll_rv = poll(pfds, 2, timeout_ms);
+
+  if (poll_rv < 0) {
+    if (errno != EINTR) {
+      gpr_log(GPR_ERROR, "poll() failed: %s", strerror(errno));
+    }
+  } else if (poll_rv == 0) {
+    /* do nothing */
+  } else {
+    if (pfds[0].revents) {
+      grpc_wakeup_fd_consume_wakeup(&worker->wakeup_fd);
+    }
+    if (pfds[1].revents) {
+      do {
+        ep_rv = epoll_wait(h->epoll_fd, ep_ev, GRPC_EPOLL_MAX_EVENTS, 0);
+        if (ep_rv < 0) {
+          if (errno != EINTR) {
+            gpr_log(GPR_ERROR, "epoll_wait() failed: %s", strerror(errno));
           }
-          if (write || cancel) {
-            grpc_fd_become_writable(fd, allow_synchronous_callback);
+        } else {
+          int i;
+          for (i = 0; i < ep_rv; ++i) {
+            grpc_fd *fd = ep_ev[i].data.ptr;
+            /* TODO(klempner): We might want to consider making err and pri
+             * separate events */
+            int cancel = ep_ev[i].events & (EPOLLERR | EPOLLHUP);
+            int read = ep_ev[i].events & (EPOLLIN | EPOLLPRI);
+            int write = ep_ev[i].events & EPOLLOUT;
+            if (read || cancel) {
+              grpc_fd_become_readable(fd, allow_synchronous_callback);
+            }
+            if (write || cancel) {
+              grpc_fd_become_writable(fd, allow_synchronous_callback);
+            }
           }
         }
-      }
+      } while (ep_rv == GRPC_EPOLL_MAX_EVENTS);
     }
-    timeout_ms = 0;
-  } while (ep_rv == GRPC_EPOLL_MAX_EVENTS);
+  }
 
   gpr_mu_lock(&pollset->mu);
-  pollset->counter -= 1;
 }
 
 static void multipoll_with_epoll_pollset_finish_shutdown(
@@ -160,21 +229,14 @@ static void multipoll_with_epoll_pollset_finish_shutdown(
 
 static void multipoll_with_epoll_pollset_destroy(grpc_pollset *pollset) {
   pollset_hdr *h = pollset->data.ptr;
-  grpc_wakeup_fd_destroy(&h->wakeup_fd);
   close(h->epoll_fd);
   gpr_free(h);
 }
 
-static void epoll_kick(grpc_pollset *pollset) {
-  pollset_hdr *h = pollset->data.ptr;
-  grpc_wakeup_fd_wakeup(&h->wakeup_fd);
-}
-
 static const grpc_pollset_vtable multipoll_with_epoll_pollset = {
     multipoll_with_epoll_pollset_add_fd,
     multipoll_with_epoll_pollset_del_fd,
     multipoll_with_epoll_pollset_maybe_work,
-    epoll_kick,
     multipoll_with_epoll_pollset_finish_shutdown,
     multipoll_with_epoll_pollset_destroy};
 
@@ -182,8 +244,6 @@ static void epoll_become_multipoller(grpc_pollset *pollset, grpc_fd **fds,
                                      size_t nfds) {
   size_t i;
   pollset_hdr *h = gpr_malloc(sizeof(pollset_hdr));
-  struct epoll_event ev;
-  int err;
 
   pollset->vtable = &multipoll_with_epoll_pollset;
   pollset->data.ptr = h;
@@ -196,16 +256,6 @@ static void epoll_become_multipoller(grpc_pollset *pollset, grpc_fd **fds,
   for (i = 0; i < nfds; i++) {
     multipoll_with_epoll_pollset_add_fd(pollset, fds[i], 0);
   }
-
-  grpc_wakeup_fd_create(&h->wakeup_fd);
-  ev.events = EPOLLIN;
-  ev.data.ptr = 0;
-  err = epoll_ctl(h->epoll_fd, EPOLL_CTL_ADD,
-                  GRPC_WAKEUP_FD_GET_READ_FD(&h->wakeup_fd), &ev);
-  if (err < 0) {
-    gpr_log(GPR_ERROR, "Wakeup fd epoll_ctl failed: %s", strerror(errno));
-    abort();
-  }
 }
 
 grpc_platform_become_multipoller_type grpc_platform_become_multipoller =
diff --git a/src/core/iomgr/pollset_multipoller_with_poll_posix.c b/src/core/iomgr/pollset_multipoller_with_poll_posix.c
index 0084e83953..b5b2d7534d 100644
--- a/src/core/iomgr/pollset_multipoller_with_poll_posix.c
+++ b/src/core/iomgr/pollset_multipoller_with_poll_posix.c
@@ -53,12 +53,6 @@ typedef struct {
   size_t fd_count;
   size_t fd_capacity;
   grpc_fd **fds;
-  /* fds being polled by the current poller: parallel arrays of pollfd, and
-     a grpc_fd_watcher */
-  size_t pfd_count;
-  size_t pfd_capacity;
-  grpc_fd_watcher *watchers;
-  struct pollfd *pfds;
   /* fds that have been removed from the pollset explicitly */
   size_t del_count;
   size_t del_capacity;
@@ -102,80 +96,60 @@ static void multipoll_with_poll_pollset_del_fd(grpc_pollset *pollset,
   }
 }
 
-static void end_polling(grpc_pollset *pollset) {
-  size_t i;
-  pollset_hdr *h;
-  h = pollset->data.ptr;
-  for (i = 1; i < h->pfd_count; i++) {
-    grpc_fd_end_poll(&h->watchers[i], h->pfds[i].revents & POLLIN,
-                     h->pfds[i].revents & POLLOUT);
-  }
-}
-
 static void multipoll_with_poll_pollset_maybe_work(
-    grpc_pollset *pollset, gpr_timespec deadline, gpr_timespec now,
-    int allow_synchronous_callback) {
+    grpc_pollset *pollset, grpc_pollset_worker *worker, gpr_timespec deadline,
+    gpr_timespec now, int allow_synchronous_callback) {
   int timeout;
   int r;
-  size_t i, np, nf, nd;
+  size_t i, j, pfd_count, fd_count;
   pollset_hdr *h;
-  grpc_kick_fd_info *kfd;
+  /* TODO(ctiller): inline some elements to avoid an allocation */
+  grpc_fd_watcher *watchers;
+  struct pollfd *pfds;
 
   h = pollset->data.ptr;
   timeout = grpc_poll_deadline_to_millis_timeout(deadline, now);
-  if (h->pfd_capacity < h->fd_count + 1) {
-    h->pfd_capacity = GPR_MAX(h->pfd_capacity * 3 / 2, h->fd_count + 1);
-    gpr_free(h->pfds);
-    gpr_free(h->watchers);
-    h->pfds = gpr_malloc(sizeof(struct pollfd) * h->pfd_capacity);
-    h->watchers = gpr_malloc(sizeof(grpc_fd_watcher) * h->pfd_capacity);
-  }
-  nf = 0;
-  np = 1;
-  kfd = grpc_pollset_kick_pre_poll(&pollset->kick_state);
-  if (kfd == NULL) {
-    /* Already kicked */
-    return;
-  }
-  h->pfds[0].fd = GRPC_POLLSET_KICK_GET_FD(kfd);
-  h->pfds[0].events = POLLIN;
-  h->pfds[0].revents = POLLOUT;
+  /* TODO(ctiller): perform just one malloc here if we exceed the inline case */
+  pfds = gpr_malloc(sizeof(*pfds) * (h->fd_count + 1));
+  watchers = gpr_malloc(sizeof(*watchers) * (h->fd_count + 1));
+  fd_count = 0;
+  pfd_count = 1;
+  pfds[0].fd = GRPC_WAKEUP_FD_GET_READ_FD(&worker->wakeup_fd);
+  pfds[0].events = POLLIN;
+  pfds[0].revents = POLLOUT;
   for (i = 0; i < h->fd_count; i++) {
     int remove = grpc_fd_is_orphaned(h->fds[i]);
-    for (nd = 0; nd < h->del_count; nd++) {
-      if (h->fds[i] == h->dels[nd]) remove = 1;
+    for (j = 0; !remove && j < h->del_count; j++) {
+      if (h->fds[i] == h->dels[j]) remove = 1;
     }
     if (remove) {
       GRPC_FD_UNREF(h->fds[i], "multipoller");
     } else {
-      h->fds[nf++] = h->fds[i];
-      h->watchers[np].fd = h->fds[i];
-      h->pfds[np].fd = h->fds[i]->fd;
-      h->pfds[np].revents = 0;
-      np++;
+      h->fds[fd_count++] = h->fds[i];
+      watchers[pfd_count].fd = h->fds[i];
+      pfds[pfd_count].fd = h->fds[i]->fd;
+      pfds[pfd_count].revents = 0;
+      pfd_count++;
     }
   }
-  h->pfd_count = np;
-  h->fd_count = nf;
-  for (nd = 0; nd < h->del_count; nd++) {
-    GRPC_FD_UNREF(h->dels[nd], "multipoller_del");
+  for (j = 0; j < h->del_count; j++) {
+    GRPC_FD_UNREF(h->dels[j], "multipoller_del");
   }
   h->del_count = 0;
-  if (h->pfd_count == 0) {
-    end_polling(pollset);
-    return;
-  }
-  pollset->counter++;
+  h->fd_count = fd_count;
   gpr_mu_unlock(&pollset->mu);
 
-  for (i = 1; i < np; i++) {
-    h->pfds[i].events = grpc_fd_begin_poll(h->watchers[i].fd, pollset, POLLIN,
-                                           POLLOUT, &h->watchers[i]);
+  for (i = 1; i < pfd_count; i++) {
+    pfds[i].events = grpc_fd_begin_poll(watchers[i].fd, pollset, POLLIN,
+                                        POLLOUT, &watchers[i]);
   }
 
-  r = poll(h->pfds, h->pfd_count, timeout);
+  r = poll(pfds, pfd_count, timeout);
 
-  end_polling(pollset);
+  for (i = 1; i < pfd_count; i++) {
+    grpc_fd_end_poll(&watchers[i], pfds[i].revents & POLLIN,
+                     pfds[i].revents & POLLOUT);
+  }
 
   if (r < 0) {
     if (errno != EINTR) {
@@ -184,35 +158,31 @@ static void multipoll_with_poll_pollset_maybe_work(
   } else if (r == 0) {
     /* do nothing */
   } else {
-    if (h->pfds[0].revents & POLLIN) {
-      grpc_pollset_kick_consume(&pollset->kick_state, kfd);
+    if (pfds[0].revents & POLLIN) {
+      grpc_wakeup_fd_consume_wakeup(&worker->wakeup_fd);
     }
-    for (i = 1; i < np; i++) {
-      if (h->watchers[i].fd == NULL) {
+    for (i = 1; i < pfd_count; i++) {
+      if (watchers[i].fd == NULL) {
         continue;
       }
-      if (h->pfds[i].revents & (POLLIN | POLLHUP | POLLERR)) {
-        grpc_fd_become_readable(h->watchers[i].fd, allow_synchronous_callback);
+      if (pfds[i].revents & (POLLIN | POLLHUP | POLLERR)) {
+        grpc_fd_become_readable(watchers[i].fd, allow_synchronous_callback);
       }
-      if (h->pfds[i].revents & (POLLOUT | POLLHUP | POLLERR)) {
-        grpc_fd_become_writable(h->watchers[i].fd, allow_synchronous_callback);
+      if (pfds[i].revents & (POLLOUT | POLLHUP | POLLERR)) {
+        grpc_fd_become_writable(watchers[i].fd, allow_synchronous_callback);
       }
     }
   }
-  grpc_pollset_kick_post_poll(&pollset->kick_state, kfd);
 
-  gpr_mu_lock(&pollset->mu);
-  pollset->counter--;
-}
+  gpr_free(pfds);
+  gpr_free(watchers);
 
-static void multipoll_with_poll_pollset_kick(grpc_pollset *p) {
-  grpc_pollset_force_kick(p);
+  gpr_mu_lock(&pollset->mu);
 }
 
 static void multipoll_with_poll_pollset_finish_shutdown(grpc_pollset *pollset) {
   size_t i;
   pollset_hdr *h = pollset->data.ptr;
-  GPR_ASSERT(pollset->counter == 0);
   for (i = 0; i < h->fd_count; i++) {
     GRPC_FD_UNREF(h->fds[i], "multipoller");
   }
@@ -226,8 +196,6 @@ static void multipoll_with_poll_pollset_finish_shutdown(grpc_pollset *pollset) {
 static void multipoll_with_poll_pollset_destroy(grpc_pollset *pollset) {
   pollset_hdr *h = pollset->data.ptr;
   multipoll_with_poll_pollset_finish_shutdown(pollset);
-  gpr_free(h->pfds);
-  gpr_free(h->watchers);
   gpr_free(h->fds);
   gpr_free(h->dels);
   gpr_free(h);
@@ -237,7 +205,6 @@ static const grpc_pollset_vtable multipoll_with_poll_pollset = {
     multipoll_with_poll_pollset_add_fd,
     multipoll_with_poll_pollset_del_fd,
     multipoll_with_poll_pollset_maybe_work,
-    multipoll_with_poll_pollset_kick,
     multipoll_with_poll_pollset_finish_shutdown,
     multipoll_with_poll_pollset_destroy};
 
@@ -250,10 +217,6 @@ void grpc_poll_become_multipoller(grpc_pollset *pollset, grpc_fd **fds,
   h->fd_count = nfds;
   h->fd_capacity = nfds;
   h->fds = gpr_malloc(nfds * sizeof(grpc_fd *));
-  h->pfd_count = 0;
-  h->pfd_capacity = 0;
-  h->pfds = NULL;
-  h->watchers = NULL;
   h->del_count = 0;
   h->del_capacity = 0;
   h->dels = NULL;
diff --git a/src/core/iomgr/pollset_posix.c b/src/core/iomgr/pollset_posix.c
index c8646af615..d3a9193af1 100644
--- a/src/core/iomgr/pollset_posix.c
+++ b/src/core/iomgr/pollset_posix.c
@@ -55,22 +55,60 @@
 #include <grpc/support/useful.h>
 
 GPR_TLS_DECL(g_current_thread_poller);
+GPR_TLS_DECL(g_current_thread_worker);
 
-void grpc_pollset_kick(grpc_pollset *p) {
-  if (gpr_tls_get(&g_current_thread_poller) != (gpr_intptr)p && p->counter) {
-    p->vtable->kick(p);
-  }
+static void remove_worker(grpc_pollset *p, grpc_pollset_worker *worker) {
+  worker->prev->next = worker->next;
+  worker->next->prev = worker->prev;
+}
+
+int grpc_pollset_has_workers(grpc_pollset *p) {
+  return p->root_worker.next != &p->root_worker;
 }
 
-void grpc_pollset_force_kick(grpc_pollset *p) {
-  if (gpr_tls_get(&g_current_thread_poller) != (gpr_intptr)p) {
-    grpc_pollset_kick_kick(&p->kick_state);
+static grpc_pollset_worker *pop_front_worker(grpc_pollset *p) {
+  if (grpc_pollset_has_workers(p)) {
+    grpc_pollset_worker *w = p->root_worker.next;
+    remove_worker(p, w);
+    return w;
+  } else {
+    return NULL;
   }
 }
 
-static void kick_using_pollset_kick(grpc_pollset *p) {
-  if (gpr_tls_get(&g_current_thread_poller) != (gpr_intptr)p) {
-    grpc_pollset_kick_kick(&p->kick_state);
+static void push_back_worker(grpc_pollset *p, grpc_pollset_worker *worker) {
+  worker->next = &p->root_worker;
+  worker->prev = worker->next->prev;
+  worker->prev->next = worker->next->prev = worker;
+}
+
+static void push_front_worker(grpc_pollset *p, grpc_pollset_worker *worker) {
+  worker->prev = &p->root_worker;
+  worker->next = worker->prev->next;
+  worker->prev->next = worker->next->prev = worker;
+}
+
+void grpc_pollset_kick(grpc_pollset *p, grpc_pollset_worker *specific_worker) {
+  if (specific_worker != NULL) {
+    if (specific_worker == GRPC_POLLSET_KICK_BROADCAST) {
+      for (specific_worker = p->root_worker.next;
+           specific_worker != &p->root_worker;
+           specific_worker = specific_worker->next) {
+        grpc_wakeup_fd_wakeup(&specific_worker->wakeup_fd);
+      }
+      p->kicked_without_pollers = 1;
+    } else if (gpr_tls_get(&g_current_thread_worker) !=
+               (gpr_intptr)specific_worker) {
+      grpc_wakeup_fd_wakeup(&specific_worker->wakeup_fd);
+    }
+  } else if (gpr_tls_get(&g_current_thread_poller) != (gpr_intptr)p) {
+    specific_worker = pop_front_worker(p);
+    if (specific_worker != NULL) {
+      push_back_worker(p, specific_worker);
+      grpc_wakeup_fd_wakeup(&specific_worker->wakeup_fd);
+    } else {
+      p->kicked_without_pollers = 1;
+    }
   }
 }
 
@@ -78,16 +116,12 @@ static void kick_using_pollset_kick(grpc_pollset *p) {
 
 void grpc_pollset_global_init(void) {
   gpr_tls_init(&g_current_thread_poller);
-
-  /* Initialize kick fd state */
-  grpc_pollset_kick_global_init();
+  grpc_wakeup_fd_global_init();
 }
 
 void grpc_pollset_global_shutdown(void) {
-  /* destroy the kick pipes */
-  grpc_pollset_kick_global_destroy();
-
   gpr_tls_destroy(&g_current_thread_poller);
+  grpc_wakeup_fd_global_destroy();
 }
 
 /* main interface */
@@ -96,7 +130,7 @@ static void become_basic_pollset(grpc_pollset *pollset, grpc_fd *fd_or_null);
 
 void grpc_pollset_init(grpc_pollset *pollset) {
   gpr_mu_init(&pollset->mu);
-  grpc_pollset_kick_init(&pollset->kick_state);
+  pollset->root_worker.next = pollset->root_worker.prev = &pollset->root_worker;
   pollset->in_flight_cbs = 0;
   pollset->shutting_down = 0;
   pollset->called_shutdown = 0;
@@ -134,27 +168,44 @@ static void finish_shutdown(grpc_pollset *pollset) {
   pollset->shutdown_done_cb(pollset->shutdown_done_arg);
 }
 
-int grpc_pollset_work(grpc_pollset *pollset, gpr_timespec deadline) {
+int grpc_pollset_work(grpc_pollset *pollset, grpc_pollset_worker *worker,
+                      gpr_timespec deadline) {
   /* pollset->mu already held */
   gpr_timespec now = gpr_now(GPR_CLOCK_MONOTONIC);
+  int added_worker = 0;
   if (gpr_time_cmp(now, deadline) > 0) {
     return 0;
   }
+  /* this must happen before we (potentially) drop pollset->mu */
+  worker->next = worker->prev = NULL;
+  /* TODO(ctiller): pool these */
+  grpc_wakeup_fd_init(&worker->wakeup_fd);
   if (grpc_maybe_call_delayed_callbacks(&pollset->mu, 1)) {
-    return 1;
+    goto done;
   }
   if (grpc_alarm_check(&pollset->mu, now, &deadline)) {
-    return 1;
+    goto done;
   }
   if (pollset->shutting_down) {
-    return 1;
+    goto done;
+  }
+  if (!pollset->kicked_without_pollers) {
+    push_front_worker(pollset, worker);
+    added_worker = 1;
+    gpr_tls_set(&g_current_thread_poller, (gpr_intptr)pollset);
+    pollset->vtable->maybe_work(pollset, worker, deadline, now, 1);
+    gpr_tls_set(&g_current_thread_poller, 0);
+  } else {
+    pollset->kicked_without_pollers = 0;
+  }
+done:
+  grpc_wakeup_fd_destroy(&worker->wakeup_fd);
+  if (added_worker) {
+    remove_worker(pollset, worker);
   }
-  gpr_tls_set(&g_current_thread_poller, (gpr_intptr)pollset);
-  pollset->vtable->maybe_work(pollset, deadline, now, 1);
-  gpr_tls_set(&g_current_thread_poller, 0);
   if (pollset->shutting_down) {
-    if (pollset->counter > 0) {
-      grpc_pollset_kick(pollset);
+    if (grpc_pollset_has_workers(pollset)) {
+      grpc_pollset_kick(pollset, NULL);
     } else if (!pollset->called_shutdown && pollset->in_flight_cbs == 0) {
       pollset->called_shutdown = 1;
       gpr_mu_unlock(&pollset->mu);
@@ -177,15 +228,13 @@ void grpc_pollset_shutdown(grpc_pollset *pollset,
   GPR_ASSERT(!pollset->shutting_down);
   pollset->shutting_down = 1;
   if (!pollset->called_shutdown && pollset->in_flight_cbs == 0 &&
-      pollset->counter == 0) {
+      !grpc_pollset_has_workers(pollset)) {
     pollset->called_shutdown = 1;
     call_shutdown = 1;
   }
   pollset->shutdown_done_cb = shutdown_done;
   pollset->shutdown_done_arg = shutdown_done_arg;
-  if (pollset->counter > 0) {
-    grpc_pollset_kick(pollset);
-  }
+  grpc_pollset_kick(pollset, GRPC_POLLSET_KICK_BROADCAST);
   gpr_mu_unlock(&pollset->mu);
 
   if (call_shutdown) {
@@ -196,8 +245,8 @@ void grpc_pollset_shutdown(grpc_pollset *pollset,
 void grpc_pollset_destroy(grpc_pollset *pollset) {
   GPR_ASSERT(pollset->shutting_down);
   GPR_ASSERT(pollset->in_flight_cbs == 0);
+  GPR_ASSERT(!grpc_pollset_has_workers(pollset));
   pollset->vtable->destroy(pollset);
-  grpc_pollset_kick_destroy(&pollset->kick_state);
   gpr_mu_destroy(&pollset->mu);
 }
 
@@ -248,8 +297,8 @@ static void basic_do_promote(void *args, int success) {
 
   gpr_mu_lock(&pollset->mu);
   /* First we need to ensure that nobody is polling concurrently */
-  if (pollset->counter != 0) {
-    grpc_pollset_kick(pollset);
+  if (grpc_pollset_has_workers(pollset)) {
+    grpc_pollset_kick(pollset, GRPC_POLLSET_KICK_BROADCAST);
     grpc_iomgr_add_callback(&up_args->promotion_closure);
     gpr_mu_unlock(&pollset->mu);
     return;
@@ -264,7 +313,8 @@ static void basic_do_promote(void *args, int success) {
   pollset->in_flight_cbs--;
   if (pollset->shutting_down) {
     /* We don't care about this pollset anymore. */
-    if (pollset->in_flight_cbs == 0 && pollset->counter == 0 && !pollset->called_shutdown) {
+    if (pollset->in_flight_cbs == 0 && !pollset->called_shutdown) {
+      GPR_ASSERT(!grpc_pollset_has_workers(pollset));
       pollset->called_shutdown = 1;
       do_shutdown_cb = 1;
     }
@@ -307,7 +357,7 @@ static void basic_pollset_add_fd(grpc_pollset *pollset, grpc_fd *fd,
   GPR_ASSERT(fd);
   if (fd == pollset->data.ptr) goto exit;
 
-  if (!pollset->counter) {
+  if (!grpc_pollset_has_workers(pollset)) {
     /* Fast path -- no in flight cbs */
     /* TODO(klempner): Comment this out and fix any test failures or establish
      * they are due to timing issues */
@@ -343,7 +393,7 @@ static void basic_pollset_add_fd(grpc_pollset *pollset, grpc_fd *fd,
   up_args->promotion_closure.cb_arg = up_args;
   grpc_iomgr_add_callback(&up_args->promotion_closure);
 
-  grpc_pollset_kick(pollset);
+  grpc_pollset_kick(pollset, GRPC_POLLSET_KICK_BROADCAST);
 
 exit:
   if (and_unlock_pollset) {
@@ -365,12 +415,12 @@ static void basic_pollset_del_fd(grpc_pollset *pollset, grpc_fd *fd,
 }
 
 static void basic_pollset_maybe_work(grpc_pollset *pollset,
+                                     grpc_pollset_worker *worker,
                                      gpr_timespec deadline, gpr_timespec now,
                                      int allow_synchronous_callback) {
   struct pollfd pfd[2];
   grpc_fd *fd;
   grpc_fd_watcher fd_watcher;
-  grpc_kick_fd_info *kfd;
   int timeout;
   int r;
   int nfds;
@@ -387,16 +437,10 @@ static void basic_pollset_maybe_work(grpc_pollset *pollset,
     fd = pollset->data.ptr = NULL;
   }
   timeout = grpc_poll_deadline_to_millis_timeout(deadline, now);
-  kfd = grpc_pollset_kick_pre_poll(&pollset->kick_state);
-  if (kfd == NULL) {
-    /* Already kicked */
-    return;
-  }
-  pfd[0].fd = GRPC_POLLSET_KICK_GET_FD(kfd);
+  pfd[0].fd = GRPC_WAKEUP_FD_GET_READ_FD(&worker->wakeup_fd);
   pfd[0].events = POLLIN;
   pfd[0].revents = 0;
   nfds = 1;
-  pollset->counter++;
   if (fd) {
     pfd[1].fd = fd->fd;
     pfd[1].revents = 0;
@@ -428,7 +472,7 @@ static void basic_pollset_maybe_work(grpc_pollset *pollset,
     /* do nothing */
   } else {
     if (pfd[0].revents & POLLIN) {
-      grpc_pollset_kick_consume(&pollset->kick_state, kfd);
+      grpc_wakeup_fd_consume_wakeup(&worker->wakeup_fd);
     }
     if (nfds > 1) {
       if (pfd[1].revents & (POLLIN | POLLHUP | POLLERR)) {
@@ -440,14 +484,10 @@ static void basic_pollset_maybe_work(grpc_pollset *pollset,
     }
   }
 
-  grpc_pollset_kick_post_poll(&pollset->kick_state, kfd);
-
   gpr_mu_lock(&pollset->mu);
-  pollset->counter--;
 }
 
 static void basic_pollset_destroy(grpc_pollset *pollset) {
-  GPR_ASSERT(pollset->counter == 0);
   if (pollset->data.ptr != NULL) {
     GRPC_FD_UNREF(pollset->data.ptr, "basicpoll");
     pollset->data.ptr = NULL;
@@ -455,14 +495,13 @@ static void basic_pollset_destroy(grpc_pollset *pollset) {
 }
 
 static const grpc_pollset_vtable basic_pollset = {
-    basic_pollset_add_fd,    basic_pollset_del_fd,  basic_pollset_maybe_work,
-    kick_using_pollset_kick, basic_pollset_destroy, basic_pollset_destroy};
+    basic_pollset_add_fd, basic_pollset_del_fd, basic_pollset_maybe_work,
+    basic_pollset_destroy, basic_pollset_destroy};
 
 static void become_basic_pollset(grpc_pollset *pollset, grpc_fd *fd_or_null) {
   pollset->vtable = &basic_pollset;
-  pollset->counter = 0;
   pollset->data.ptr = fd_or_null;
-  if (fd_or_null) {
+  if (fd_or_null != NULL) {
     GRPC_FD_REF(fd_or_null, "basicpoll");
   }
 }
diff --git a/src/core/iomgr/pollset_posix.h b/src/core/iomgr/pollset_posix.h
index 37de1276d1..1c1b736193 100644
--- a/src/core/iomgr/pollset_posix.h
+++ b/src/core/iomgr/pollset_posix.h
@@ -35,8 +35,7 @@
 #define GRPC_INTERNAL_CORE_IOMGR_POLLSET_POSIX_H
 
 #include <grpc/support/sync.h>
-
-#include "src/core/iomgr/pollset_kick_posix.h"
+#include "src/core/iomgr/wakeup_fd_posix.h"
 
 typedef struct grpc_pollset_vtable grpc_pollset_vtable;
 
@@ -45,6 +44,12 @@ typedef struct grpc_pollset_vtable grpc_pollset_vtable;
    use the struct tag */
 struct grpc_fd;
 
+typedef struct grpc_pollset_worker {
+  grpc_wakeup_fd wakeup_fd;
+  struct grpc_pollset_worker *next;
+  struct grpc_pollset_worker *prev;
+} grpc_pollset_worker;
+
 typedef struct grpc_pollset {
   /* pollsets under posix can mutate representation as fds are added and
      removed.
@@ -52,11 +57,11 @@ typedef struct grpc_pollset {
      few fds, and an epoll() based implementation for many fds */
   const grpc_pollset_vtable *vtable;
   gpr_mu mu;
-  grpc_pollset_kick_state kick_state;
-  int counter;
+  grpc_pollset_worker root_worker;
   int in_flight_cbs;
   int shutting_down;
   int called_shutdown;
+  int kicked_without_pollers;
   void (*shutdown_done_cb)(void *arg);
   void *shutdown_done_arg;
   union {
@@ -70,9 +75,9 @@ struct grpc_pollset_vtable {
                  int and_unlock_pollset);
   void (*del_fd)(grpc_pollset *pollset, struct grpc_fd *fd,
                  int and_unlock_pollset);
-  void (*maybe_work)(grpc_pollset *pollset, gpr_timespec deadline,
-                     gpr_timespec now, int allow_synchronous_callback);
-  void (*kick)(grpc_pollset *pollset);
+  void (*maybe_work)(grpc_pollset *pollset, grpc_pollset_worker *worker,
+                     gpr_timespec deadline, gpr_timespec now,
+                     int allow_synchronous_callback);
   void (*finish_shutdown)(grpc_pollset *pollset);
   void (*destroy)(grpc_pollset *pollset);
 };
@@ -85,22 +90,16 @@ void grpc_pollset_add_fd(grpc_pollset *pollset, struct grpc_fd *fd);
    poll after an fd is orphaned) */
 void grpc_pollset_del_fd(grpc_pollset *pollset, struct grpc_fd *fd);
 
-/* Force any current pollers to break polling: it's the callers responsibility
-   to ensure that the pollset indeed needs to be kicked - no verification that
-   the pollset is actually performing polling work is done. At worst this will
-   result in spurious wakeups if performed at the wrong moment.
-   Does not touch pollset->mu. */
-void grpc_pollset_force_kick(grpc_pollset *pollset);
 /* Returns the fd to listen on for kicks */
 int grpc_kick_read_fd(grpc_pollset *p);
 /* Call after polling has been kicked to leave the kicked state */
 void grpc_kick_drain(grpc_pollset *p);
 
 /* Convert a timespec to milliseconds:
-   - very small or negative poll times are clamped to zero to do a 
+   - very small or negative poll times are clamped to zero to do a
      non-blocking poll (which becomes spin polling)
    - other small values are rounded up to one millisecond
-   - longer than a millisecond polls are rounded up to the next nearest 
+   - longer than a millisecond polls are rounded up to the next nearest
      millisecond to avoid spinning
    - infinite timeouts are converted to -1 */
 int grpc_poll_deadline_to_millis_timeout(gpr_timespec deadline, gpr_timespec now);
@@ -114,4 +113,8 @@ extern grpc_platform_become_multipoller_type grpc_platform_become_multipoller;
 void grpc_poll_become_multipoller(grpc_pollset *pollset, struct grpc_fd **fds,
                                   size_t fd_count);
 
+/* Return 1 if the pollset has active threads in grpc_pollset_work (pollset must
+ * be locked) */
+int grpc_pollset_has_workers(grpc_pollset *pollset);
+
 #endif /* GRPC_INTERNAL_CORE_IOMGR_POLLSET_POSIX_H */
diff --git a/src/core/iomgr/pollset_set_posix.c b/src/core/iomgr/pollset_set_posix.c
index 5ff7df1dcd..2076ac70ef 100644
--- a/src/core/iomgr/pollset_set_posix.c
+++ b/src/core/iomgr/pollset_set_posix.c
@@ -60,7 +60,7 @@ void grpc_pollset_set_destroy(grpc_pollset_set *pollset_set) {
 
 void grpc_pollset_set_add_pollset(grpc_pollset_set *pollset_set,
                                   grpc_pollset *pollset) {
-  size_t i;
+  size_t i, j;
   gpr_mu_lock(&pollset_set->mu);
   if (pollset_set->pollset_count == pollset_set->pollset_capacity) {
     pollset_set->pollset_capacity =
@@ -70,9 +70,15 @@ void grpc_pollset_set_add_pollset(grpc_pollset_set *pollset_set,
                                                sizeof(*pollset_set->pollsets));
   }
   pollset_set->pollsets[pollset_set->pollset_count++] = pollset;
-  for (i = 0; i < pollset_set->fd_count; i++) {
-    grpc_pollset_add_fd(pollset, pollset_set->fds[i]);
+  for (i = 0, j = 0; i < pollset_set->fd_count; i++) {
+    if (grpc_fd_is_orphaned(pollset_set->fds[i])) {
+      GRPC_FD_UNREF(pollset_set->fds[i], "pollset");
+    } else {
+      grpc_pollset_add_fd(pollset, pollset_set->fds[i]);
+      pollset_set->fds[j++] = pollset_set->fds[i];
+    }
   }
+  pollset_set->fd_count = j;
   gpr_mu_unlock(&pollset_set->mu);
 }
 
diff --git a/src/core/iomgr/pollset_windows.c b/src/core/iomgr/pollset_windows.c
index a9c4739c7c..22dc5891c3 100644
--- a/src/core/iomgr/pollset_windows.c
+++ b/src/core/iomgr/pollset_windows.c
@@ -42,6 +42,38 @@
 #include "src/core/iomgr/pollset.h"
 #include "src/core/iomgr/pollset_windows.h"
 
+static void remove_worker(grpc_pollset *p, grpc_pollset_worker *worker) {
+  worker->prev->next = worker->next;
+  worker->next->prev = worker->prev;
+}
+
+static int has_workers(grpc_pollset *p) {
+  return p->root_worker.next != &p->root_worker;
+}
+
+static grpc_pollset_worker *pop_front_worker(grpc_pollset *p) {
+  if (has_workers(p)) {
+    grpc_pollset_worker *w = p->root_worker.next;
+    remove_worker(p, w);
+    return w;
+  }
+  else {
+    return NULL;
+  }
+}
+
+static void push_back_worker(grpc_pollset *p, grpc_pollset_worker *worker) {
+  worker->next = &p->root_worker;
+  worker->prev = worker->next->prev;
+  worker->prev->next = worker->next->prev = worker;
+}
+
+static void push_front_worker(grpc_pollset *p, grpc_pollset_worker *worker) {
+  worker->prev = &p->root_worker;
+  worker->next = worker->prev->next;
+  worker->prev->next = worker->next->prev = worker;
+}
+
 /* There isn't really any such thing as a pollset under Windows, due to the
    nature of the IO completion ports. We're still going to provide a minimal
    set of features for the sake of the rest of grpc. But grpc_pollset_work
@@ -50,7 +82,8 @@
 void grpc_pollset_init(grpc_pollset *pollset) {
   memset(pollset, 0, sizeof(*pollset));
   gpr_mu_init(&pollset->mu);
-  gpr_cv_init(&pollset->cv);
+  pollset->root_worker.next = pollset->root_worker.prev = &pollset->root_worker;
+  pollset->kicked_without_pollers = 0;
 }
 
 void grpc_pollset_shutdown(grpc_pollset *pollset,
@@ -58,34 +91,66 @@ void grpc_pollset_shutdown(grpc_pollset *pollset,
                            void *shutdown_done_arg) {
   gpr_mu_lock(&pollset->mu);
   pollset->shutting_down = 1;
-  gpr_cv_broadcast(&pollset->cv);
+  grpc_pollset_kick(pollset, GRPC_POLLSET_KICK_BROADCAST);
   gpr_mu_unlock(&pollset->mu);
   shutdown_done(shutdown_done_arg);
 }
 
 void grpc_pollset_destroy(grpc_pollset *pollset) {
   gpr_mu_destroy(&pollset->mu);
-  gpr_cv_destroy(&pollset->cv);
 }
 
-int grpc_pollset_work(grpc_pollset *pollset, gpr_timespec deadline) {
+int grpc_pollset_work(grpc_pollset *pollset, grpc_pollset_worker *worker, gpr_timespec deadline) {
   gpr_timespec now;
+  int added_worker = 0;
   now = gpr_now(GPR_CLOCK_MONOTONIC);
   if (gpr_time_cmp(now, deadline) > 0) {
     return 0 /* GPR_FALSE */;
   }
+  worker->next = worker->prev = NULL;
+  gpr_cv_init(&worker->cv);
   if (grpc_maybe_call_delayed_callbacks(&pollset->mu, 1 /* GPR_TRUE */)) {
-    return 1 /* GPR_TRUE */;
+    goto done;
   }
   if (grpc_alarm_check(&pollset->mu, now, &deadline)) {
-    return 1 /* GPR_TRUE */;
+    goto done;
   }
-  if (!pollset->shutting_down) {
-    gpr_cv_wait(&pollset->cv, &pollset->mu, deadline);
+  if (!pollset->kicked_without_pollers && !pollset->shutting_down) {
+    push_front_worker(pollset, worker);
+    added_worker = 1;
+    gpr_cv_wait(&worker->cv, &pollset->mu, deadline);
+  } else {
+    pollset->kicked_without_pollers = 0;
+  }
+done:
+  gpr_cv_destroy(&worker->cv);
+  if (added_worker) {
+    remove_worker(pollset, worker);
   }
   return 1 /* GPR_TRUE */;
 }
 
-void grpc_pollset_kick(grpc_pollset *p) { gpr_cv_signal(&p->cv); }
+void grpc_pollset_kick(grpc_pollset *p, grpc_pollset_worker *specific_worker) {
+  if (specific_worker != NULL) {
+    if (specific_worker == GRPC_POLLSET_KICK_BROADCAST) {
+      for (specific_worker = p->root_worker.next;
+        specific_worker != &p->root_worker;
+        specific_worker = specific_worker->next) {
+        gpr_cv_signal(&specific_worker->cv);
+      }
+      p->kicked_without_pollers = 1;
+    } else {
+      gpr_cv_signal(&specific_worker->cv);
+    }
+  } else {
+    specific_worker = pop_front_worker(p);
+    if (specific_worker != NULL) {
+      push_back_worker(p, specific_worker);
+      gpr_cv_signal(&specific_worker->cv);
+    } else {
+      p->kicked_without_pollers = 1;
+    }
+  }
+}
 
 #endif /* GPR_WINSOCK_SOCKET */
diff --git a/src/core/iomgr/pollset_windows.h b/src/core/iomgr/pollset_windows.h
index c9b8d3f374..4efa5a1717 100644
--- a/src/core/iomgr/pollset_windows.h
+++ b/src/core/iomgr/pollset_windows.h
@@ -40,12 +40,20 @@
 
 /* There isn't really any such thing as a pollset under Windows, due to the
    nature of the IO completion ports. A Windows "pollset" is merely a mutex
-   and a condition variable, used to synchronize with the IOCP. */
+   used to synchronize with the IOCP, and workers are condition variables
+   used to block threads until work is ready. */
+
+typedef struct grpc_pollset_worker {
+  gpr_cv cv;
+  struct grpc_pollset_worker *next;
+  struct grpc_pollset_worker *prev;
+} grpc_pollset_worker;
 
 typedef struct grpc_pollset {
   gpr_mu mu;
-  gpr_cv cv;
   int shutting_down;
+  int kicked_without_pollers;
+  grpc_pollset_worker root_worker;
 } grpc_pollset;
 
 #define GRPC_POLLSET_MU(pollset) (&(pollset)->mu)
diff --git a/src/core/iomgr/sockaddr_utils.c b/src/core/iomgr/sockaddr_utils.c
index e91b94f8c8..65ec1f94ac 100644
--- a/src/core/iomgr/sockaddr_utils.c
+++ b/src/core/iomgr/sockaddr_utils.c
@@ -36,12 +36,18 @@
 #include <errno.h>
 #include <string.h>
 
-#include "src/core/support/string.h"
+#ifdef GPR_POSIX_SOCKET
+#include <sys/un.h>
+#endif
+
+#include <grpc/support/alloc.h>
 #include <grpc/support/host_port.h>
 #include <grpc/support/log.h>
 #include <grpc/support/port_platform.h>
 #include <grpc/support/string_util.h>
 
+#include "src/core/support/string.h"
+
 static const gpr_uint8 kV4MappedPrefix[] = {0, 0, 0, 0, 0,    0,
                                             0, 0, 0, 0, 0xff, 0xff};
 
@@ -161,6 +167,36 @@ int grpc_sockaddr_to_string(char **out, const struct sockaddr *addr,
   return ret;
 }
 
+char *grpc_sockaddr_to_uri(const struct sockaddr *addr) {
+  char *temp;
+  char *result;
+  struct sockaddr_in addr_normalized;
+
+  if (grpc_sockaddr_is_v4mapped(addr, &addr_normalized)) {
+    addr = (const struct sockaddr *)&addr_normalized;
+  }
+
+  switch (addr->sa_family) {
+    case AF_INET:
+      grpc_sockaddr_to_string(&temp, addr, 0);
+      gpr_asprintf(&result, "ipv4:%s", temp);
+      gpr_free(temp);
+      return result;
+    case AF_INET6:
+      grpc_sockaddr_to_string(&temp, addr, 0);
+      gpr_asprintf(&result, "ipv6:%s", temp);
+      gpr_free(temp);
+      return result;
+#ifdef GPR_POSIX_SOCKET
+    case AF_UNIX:
+      gpr_asprintf(&result, "unix:%s", ((struct sockaddr_un *)addr)->sun_path);
+      return result;
+#endif
+  }
+
+  return NULL;
+}
+
 int grpc_sockaddr_get_port(const struct sockaddr *addr) {
   switch (addr->sa_family) {
     case AF_INET:
diff --git a/src/core/iomgr/sockaddr_utils.h b/src/core/iomgr/sockaddr_utils.h
index bdfb83479b..99f1ed54da 100644
--- a/src/core/iomgr/sockaddr_utils.h
+++ b/src/core/iomgr/sockaddr_utils.h
@@ -84,4 +84,6 @@ int grpc_sockaddr_set_port(const struct sockaddr *addr, int port);
 int grpc_sockaddr_to_string(char **out, const struct sockaddr *addr,
                             int normalize);
 
+char *grpc_sockaddr_to_uri(const struct sockaddr *addr);
+
 #endif  /* GRPC_INTERNAL_CORE_IOMGR_SOCKADDR_UTILS_H */
diff --git a/src/core/iomgr/tcp_client_posix.c b/src/core/iomgr/tcp_client_posix.c
index 41d8b169e0..9572ce5980 100644
--- a/src/core/iomgr/tcp_client_posix.c
+++ b/src/core/iomgr/tcp_client_posix.c
@@ -64,6 +64,7 @@ typedef struct {
   int refs;
   grpc_iomgr_closure write_closure;
   grpc_pollset_set *interested_parties;
+  char *addr_str;
 } async_connect;
 
 static int prepare_socket(const struct sockaddr *addr, int fd) {
@@ -88,17 +89,18 @@ error:
   return 0;
 }
 
-static void on_alarm(void *acp, int success) {
+static void tc_on_alarm(void *acp, int success) {
   int done;
   async_connect *ac = acp;
   gpr_mu_lock(&ac->mu);
-  if (ac->fd != NULL && success) {
+  if (ac->fd != NULL) {
     grpc_fd_shutdown(ac->fd);
   }
   done = (--ac->refs == 0);
   gpr_mu_unlock(&ac->mu);
   if (done) {
     gpr_mu_destroy(&ac->mu);
+    gpr_free(ac->addr_str);
     gpr_free(ac);
   }
 }
@@ -108,11 +110,17 @@ static void on_writable(void *acp, int success) {
   int so_error = 0;
   socklen_t so_error_size;
   int err;
-  int fd = ac->fd->fd;
   int done;
   grpc_endpoint *ep = NULL;
   void (*cb)(void *arg, grpc_endpoint *tcp) = ac->cb;
   void *cb_arg = ac->cb_arg;
+  grpc_fd *fd;
+
+  gpr_mu_lock(&ac->mu);
+  GPR_ASSERT(ac->fd);
+  fd = ac->fd;
+  ac->fd = NULL;
+  gpr_mu_unlock(&ac->mu);
 
   grpc_alarm_cancel(&ac->alarm);
 
@@ -120,7 +128,7 @@ static void on_writable(void *acp, int success) {
   if (success) {
     do {
       so_error_size = sizeof(so_error);
-      err = getsockopt(fd, SOL_SOCKET, SO_ERROR, &so_error, &so_error_size);
+      err = getsockopt(fd->fd, SOL_SOCKET, SO_ERROR, &so_error, &so_error_size);
     } while (err < 0 && errno == EINTR);
     if (err < 0) {
       gpr_log(GPR_ERROR, "getsockopt(ERROR): %s", strerror(errno));
@@ -143,7 +151,7 @@ static void on_writable(void *acp, int success) {
            don't do that! */
         gpr_log(GPR_ERROR, "kernel out of buffers");
         gpr_mu_unlock(&ac->mu);
-        grpc_fd_notify_on_write(ac->fd, &ac->write_closure);
+        grpc_fd_notify_on_write(fd, &ac->write_closure);
         return;
       } else {
         switch (so_error) {
@@ -157,8 +165,9 @@ static void on_writable(void *acp, int success) {
         goto finish;
       }
     } else {
-      grpc_pollset_set_del_fd(ac->interested_parties, ac->fd);
-      ep = grpc_tcp_create(ac->fd, GRPC_TCP_DEFAULT_READ_SLICE_SIZE);
+      grpc_pollset_set_del_fd(ac->interested_parties, fd);
+      ep = grpc_tcp_create(fd, GRPC_TCP_DEFAULT_READ_SLICE_SIZE, ac->addr_str);
+      fd = NULL;
       goto finish;
     }
   } else {
@@ -169,16 +178,16 @@ static void on_writable(void *acp, int success) {
   abort();
 
 finish:
-  if (ep == NULL) {
-    grpc_pollset_set_del_fd(ac->interested_parties, ac->fd);
-    grpc_fd_orphan(ac->fd, NULL, "tcp_client_orphan");
-  } else {
-    ac->fd = NULL;
+  if (fd != NULL) {
+    grpc_pollset_set_del_fd(ac->interested_parties, fd);
+    grpc_fd_orphan(fd, NULL, "tcp_client_orphan");
+    fd = NULL;
   }
   done = (--ac->refs == 0);
   gpr_mu_unlock(&ac->mu);
   if (done) {
     gpr_mu_destroy(&ac->mu);
+    gpr_free(ac->addr_str);
     gpr_free(ac);
   }
   cb(cb_arg, ep);
@@ -223,13 +232,13 @@ void grpc_tcp_client_connect(void (*cb)(void *arg, grpc_endpoint *ep),
     err = connect(fd, addr, addr_len);
   } while (err < 0 && errno == EINTR);
 
-  grpc_sockaddr_to_string(&addr_str, addr, 1);
+  addr_str = grpc_sockaddr_to_uri(addr);
   gpr_asprintf(&name, "tcp-client:%s", addr_str);
 
   fdobj = grpc_fd_create(fd, name);
 
   if (err >= 0) {
-    cb(arg, grpc_tcp_create(fdobj, GRPC_TCP_DEFAULT_READ_SLICE_SIZE));
+    cb(arg, grpc_tcp_create(fdobj, GRPC_TCP_DEFAULT_READ_SLICE_SIZE, addr_str));
     goto done;
   }
 
@@ -247,6 +256,8 @@ void grpc_tcp_client_connect(void (*cb)(void *arg, grpc_endpoint *ep),
   ac->cb_arg = arg;
   ac->fd = fdobj;
   ac->interested_parties = interested_parties;
+  ac->addr_str = addr_str;
+  addr_str = NULL;
   gpr_mu_init(&ac->mu);
   ac->refs = 2;
   ac->write_closure.cb = on_writable;
@@ -254,7 +265,7 @@ void grpc_tcp_client_connect(void (*cb)(void *arg, grpc_endpoint *ep),
 
   gpr_mu_lock(&ac->mu);
   grpc_alarm_init(&ac->alarm, gpr_convert_clock_type(deadline, GPR_CLOCK_MONOTONIC), 
-                  on_alarm, ac, gpr_now(GPR_CLOCK_MONOTONIC));
+                  tc_on_alarm, ac, gpr_now(GPR_CLOCK_MONOTONIC));
   grpc_fd_notify_on_write(ac->fd, &ac->write_closure);
   gpr_mu_unlock(&ac->mu);
 
diff --git a/src/core/iomgr/tcp_client_windows.c b/src/core/iomgr/tcp_client_windows.c
index 39fd43130b..79a58fe2af 100644
--- a/src/core/iomgr/tcp_client_windows.c
+++ b/src/core/iomgr/tcp_client_windows.c
@@ -58,6 +58,7 @@ typedef struct {
   grpc_winsocket *socket;
   gpr_timespec deadline;
   grpc_alarm alarm;
+  char *addr_name;
   int refs;
   int aborted;
 } async_connect;
@@ -67,6 +68,7 @@ static void async_connect_cleanup(async_connect *ac) {
   gpr_mu_unlock(&ac->mu);
   if (done) {
     gpr_mu_destroy(&ac->mu);
+    gpr_free(ac->addr_name);
     gpr_free(ac);
   }
 }
@@ -107,7 +109,7 @@ static void on_connect(void *acp, int from_iocp) {
       gpr_log(GPR_ERROR, "on_connect error: %s", utf8_message);
       gpr_free(utf8_message);
     } else if (!aborted) {
-      ep = grpc_tcp_create(ac->socket);
+      ep = grpc_tcp_create(ac->socket, ac->addr_name);
     }
   } else {
     gpr_log(GPR_ERROR, "on_connect is shutting down");
@@ -213,6 +215,7 @@ void grpc_tcp_client_connect(void (*cb)(void *arg, grpc_endpoint *tcp),
   ac->socket = socket;
   gpr_mu_init(&ac->mu);
   ac->refs = 2;
+  ac->addr_name = grpc_sockaddr_to_uri(addr);
   ac->aborted = 0;
 
   grpc_alarm_init(&ac->alarm, deadline, on_alarm, ac,
diff --git a/src/core/iomgr/tcp_posix.c b/src/core/iomgr/tcp_posix.c
index b6d6efc9fb..24fee0596f 100644
--- a/src/core/iomgr/tcp_posix.c
+++ b/src/core/iomgr/tcp_posix.c
@@ -44,15 +44,17 @@
 #include <sys/socket.h>
 #include <unistd.h>
 
-#include "src/core/support/string.h"
-#include "src/core/debug/trace.h"
-#include "src/core/profiling/timers.h"
 #include <grpc/support/alloc.h>
 #include <grpc/support/log.h>
 #include <grpc/support/slice.h>
+#include <grpc/support/string_util.h>
 #include <grpc/support/sync.h>
 #include <grpc/support/time.h>
 
+#include "src/core/support/string.h"
+#include "src/core/debug/trace.h"
+#include "src/core/profiling/timers.h"
+
 #ifdef GPR_HAVE_MSG_NOSIGNAL
 #define SENDMSG_FLAGS MSG_NOSIGNAL
 #else
@@ -282,6 +284,8 @@ typedef struct {
   grpc_iomgr_closure write_closure;
 
   grpc_iomgr_closure handle_read_closure;
+
+  char *peer_string;
 } grpc_tcp;
 
 static void grpc_tcp_handle_read(void *arg /* grpc_tcp */, int success);
@@ -296,6 +300,7 @@ static void grpc_tcp_unref(grpc_tcp *tcp) {
   int refcount_zero = gpr_unref(&tcp->refcount);
   if (refcount_zero) {
     grpc_fd_orphan(tcp->em_fd, NULL, "tcp_unref_orphan");
+    gpr_free(tcp->peer_string);
     gpr_free(tcp);
   }
 }
@@ -314,7 +319,7 @@ static void call_read_cb(grpc_tcp *tcp, gpr_slice *slices, size_t nslices,
     gpr_log(GPR_DEBUG, "read: status=%d", status);
     for (i = 0; i < nslices; i++) {
       char *dump = gpr_dump_slice(slices[i], GPR_DUMP_HEX | GPR_DUMP_ASCII);
-      gpr_log(GPR_DEBUG, "READ: %s", dump);
+      gpr_log(GPR_DEBUG, "READ %p: %s", tcp, dump);
       gpr_free(dump);
     }
   }
@@ -443,7 +448,7 @@ static void grpc_tcp_notify_on_read(grpc_endpoint *ep, grpc_endpoint_read_cb cb,
     grpc_fd_notify_on_read(tcp->em_fd, &tcp->read_closure);
   } else {
     tcp->handle_read_closure.cb_arg = tcp;
-    grpc_iomgr_add_callback(&tcp->handle_read_closure);
+    grpc_iomgr_add_delayed_callback(&tcp->handle_read_closure, 1);
   }
 }
 
@@ -567,13 +572,27 @@ static void grpc_tcp_add_to_pollset(grpc_endpoint *ep, grpc_pollset *pollset) {
   grpc_pollset_add_fd(pollset, tcp->em_fd);
 }
 
+static void grpc_tcp_add_to_pollset_set(grpc_endpoint *ep, grpc_pollset_set *pollset_set) {
+  grpc_tcp *tcp = (grpc_tcp *)ep;
+  grpc_pollset_set_add_fd(pollset_set, tcp->em_fd);
+}
+
+static char *grpc_tcp_get_peer(grpc_endpoint *ep) {
+  grpc_tcp *tcp = (grpc_tcp *)ep;
+  return gpr_strdup(tcp->peer_string);
+}
+
 static const grpc_endpoint_vtable vtable = {
-    grpc_tcp_notify_on_read, grpc_tcp_write, grpc_tcp_add_to_pollset,
-    grpc_tcp_shutdown, grpc_tcp_destroy};
+    grpc_tcp_notify_on_read, grpc_tcp_write,
+    grpc_tcp_add_to_pollset, grpc_tcp_add_to_pollset_set,
+    grpc_tcp_shutdown,       grpc_tcp_destroy,
+    grpc_tcp_get_peer};
 
-grpc_endpoint *grpc_tcp_create(grpc_fd *em_fd, size_t slice_size) {
+grpc_endpoint *grpc_tcp_create(grpc_fd *em_fd, size_t slice_size,
+                               const char *peer_string) {
   grpc_tcp *tcp = (grpc_tcp *)gpr_malloc(sizeof(grpc_tcp));
   tcp->base.vtable = &vtable;
+  tcp->peer_string = gpr_strdup(peer_string);
   tcp->fd = em_fd->fd;
   tcp->read_cb = NULL;
   tcp->write_cb = NULL;
diff --git a/src/core/iomgr/tcp_posix.h b/src/core/iomgr/tcp_posix.h
index 44279d5a26..d752feaeea 100644
--- a/src/core/iomgr/tcp_posix.h
+++ b/src/core/iomgr/tcp_posix.h
@@ -53,6 +53,7 @@ extern int grpc_tcp_trace;
 
 /* Create a tcp endpoint given a file desciptor and a read slice size.
    Takes ownership of fd. */
-grpc_endpoint *grpc_tcp_create(grpc_fd *fd, size_t read_slice_size);
+grpc_endpoint *grpc_tcp_create(grpc_fd *fd, size_t read_slice_size,
+                               const char *peer_string);
 
 #endif  /* GRPC_INTERNAL_CORE_IOMGR_TCP_POSIX_H */
diff --git a/src/core/iomgr/tcp_server_posix.c b/src/core/iomgr/tcp_server_posix.c
index 5854031c9b..6399aaadb9 100644
--- a/src/core/iomgr/tcp_server_posix.c
+++ b/src/core/iomgr/tcp_server_posix.c
@@ -142,6 +142,7 @@ grpc_tcp_server *grpc_tcp_server_create(void) {
 
 static void finish_shutdown(grpc_tcp_server *s) {
   s->shutdown_complete(s->shutdown_complete_arg);
+  s->shutdown_complete = NULL;
 
   gpr_mu_destroy(&s->mu);
 
@@ -157,6 +158,7 @@ static void destroyed_port(void *server, int success) {
     gpr_mu_unlock(&s->mu);
     finish_shutdown(s);
   } else {
+    GPR_ASSERT(s->destroyed_ports < s->nports);
     gpr_mu_unlock(&s->mu);
   }
 }
@@ -332,7 +334,7 @@ static void on_read(void *arg, int success) {
 
     grpc_set_socket_no_sigpipe_if_possible(fd);
 
-    grpc_sockaddr_to_string(&addr_str, (struct sockaddr *)&addr, 1);
+    addr_str = grpc_sockaddr_to_uri((struct sockaddr *)&addr);
     gpr_asprintf(&name, "tcp-server-connection:%s", addr_str);
 
     fdobj = grpc_fd_create(fd, name);
@@ -342,8 +344,9 @@ static void on_read(void *arg, int success) {
     for (i = 0; i < sp->server->pollset_count; i++) {
       grpc_pollset_add_fd(sp->server->pollsets[i], fdobj);
     }
-    sp->server->cb(sp->server->cb_arg,
-                   grpc_tcp_create(fdobj, GRPC_TCP_DEFAULT_READ_SLICE_SIZE));
+    sp->server->cb(
+        sp->server->cb_arg,
+        grpc_tcp_create(fdobj, GRPC_TCP_DEFAULT_READ_SLICE_SIZE, addr_str));
 
     gpr_free(name);
     gpr_free(addr_str);
diff --git a/src/core/iomgr/tcp_server_windows.c b/src/core/iomgr/tcp_server_windows.c
index 187009b2c8..0adbe9507c 100644
--- a/src/core/iomgr/tcp_server_windows.c
+++ b/src/core/iomgr/tcp_server_windows.c
@@ -79,6 +79,8 @@ struct grpc_tcp_server {
 
   /* active port count: how many ports are actually still listening */
   int active_ports;
+  /* number of iomgr callbacks that have been explicitly scheduled during shutdown */
+  int iomgr_callbacks_pending;
 
   /* all listening ports */
   server_port *ports;
@@ -93,6 +95,7 @@ grpc_tcp_server *grpc_tcp_server_create(void) {
   gpr_mu_init(&s->mu);
   gpr_cv_init(&s->cv);
   s->active_ports = 0;
+  s->iomgr_callbacks_pending = 0;
   s->cb = NULL;
   s->cb_arg = NULL;
   s->ports = gpr_malloc(sizeof(server_port) * INIT_PORT_CAP);
@@ -112,10 +115,10 @@ void grpc_tcp_server_destroy(grpc_tcp_server *s,
   for (i = 0; i < s->nports; i++) {
     server_port *sp = &s->ports[i];
     sp->shutting_down = 1;
-    grpc_winsocket_shutdown(sp->socket);
+    s->iomgr_callbacks_pending += grpc_winsocket_shutdown(sp->socket);
   }
   /* This happens asynchronously. Wait while that happens. */
-  while (s->active_ports) {
+  while (s->active_ports || s->iomgr_callbacks_pending) {
     gpr_cv_wait(&s->cv, &s->mu, gpr_inf_future(GPR_CLOCK_REALTIME));
   }
   gpr_mu_unlock(&s->mu);
@@ -183,6 +186,17 @@ error:
   return -1;
 }
 
+static void decrement_active_ports_and_notify(server_port *sp) {
+  sp->shutting_down = 0;
+  sp->socket->read_info.outstanding = 0;
+  gpr_mu_lock(&sp->server->mu);
+  GPR_ASSERT(sp->server->active_ports > 0);
+  if (0 == --sp->server->active_ports) {
+    gpr_cv_broadcast(&sp->server->cv);
+  }
+  gpr_mu_unlock(&sp->server->mu);
+}
+
 /* start_accept will reference that for the IOCP notification request. */
 static void on_accept(void *arg, int from_iocp);
 
@@ -231,6 +245,15 @@ static void start_accept(server_port *port) {
   return;
 
 failure:
+  if (port->shutting_down) {
+    /* We are abandoning the listener port, take that into account to prevent
+       occasional hangs on shutdown. The hang happens when sp->shutting_down
+       change is not seen by on_accept and we proceed to trying new accept,
+       but we fail there because the listening port has been closed in the
+       meantime. */
+    decrement_active_ports_and_notify(port);
+    return;
+  }
   utf8_message = gpr_format_message(WSAGetLastError());
   gpr_log(GPR_ERROR, message, utf8_message);
   gpr_free(utf8_message);
@@ -243,14 +266,27 @@ static void on_accept(void *arg, int from_iocp) {
   SOCKET sock = sp->new_socket;
   grpc_winsocket_callback_info *info = &sp->socket->read_info;
   grpc_endpoint *ep = NULL;
+  struct sockaddr_storage peer_name;
+  char *peer_name_string;
+  char *fd_name;
+  int peer_name_len = sizeof(peer_name);
   DWORD transfered_bytes;
   DWORD flags;
   BOOL wsa_success;
+  int err;
 
   /* The general mechanism for shutting down is to queue abortion calls. While
      this is necessary in the read/write case, it's useless for the accept
-     case. Let's do nothing. */
-  if (!from_iocp) return;
+     case. We only need to adjust the pending callback count */
+  if (!from_iocp) {
+    gpr_mu_lock(&sp->server->mu);
+    GPR_ASSERT(sp->server->iomgr_callbacks_pending > 0);
+    if (0 == --sp->server->iomgr_callbacks_pending) {
+      gpr_cv_broadcast(&sp->server->cv);
+    }
+    gpr_mu_unlock(&sp->server->mu);
+    return;
+  }
 
   /* The IOCP notified us of a completed operation. Let's grab the results,
       and act accordingly. */
@@ -259,15 +295,9 @@ static void on_accept(void *arg, int from_iocp) {
                                             &transfered_bytes, FALSE, &flags);
   if (!wsa_success) {
     if (sp->shutting_down) {
-      /* During the shutdown case, we ARE expecting an error. So that's swell,
+      /* During the shutdown case, we ARE expecting an error. So that's well,
          and we can wake up the shutdown thread. */
-      sp->shutting_down = 0;
-      sp->socket->read_info.outstanding = 0;
-      gpr_mu_lock(&sp->server->mu);
-      if (0 == --sp->server->active_ports) {
-        gpr_cv_broadcast(&sp->server->cv);
-      }
-      gpr_mu_unlock(&sp->server->mu);
+      decrement_active_ports_and_notify(sp);
       return;
     } else {
       char *utf8_message = gpr_format_message(WSAGetLastError());
@@ -277,8 +307,28 @@ static void on_accept(void *arg, int from_iocp) {
     }
   } else {
     if (!sp->shutting_down) {
-      /* TODO(ctiller): add sockaddr address to label */
-      ep = grpc_tcp_create(grpc_winsocket_create(sock, "server"));
+      peer_name_string = NULL;
+      err = setsockopt(sock, SOL_SOCKET, SO_UPDATE_ACCEPT_CONTEXT,
+                       (char *)&sp->socket->socket,
+                       sizeof(sp->socket->socket));
+      if (err) {
+        char *utf8_message = gpr_format_message(WSAGetLastError());
+        gpr_log(GPR_ERROR, "setsockopt error: %s", utf8_message);
+        gpr_free(utf8_message);
+      }
+      err = getpeername(sock, (struct sockaddr*)&peer_name, &peer_name_len);
+      if (!err) {
+        peer_name_string = grpc_sockaddr_to_uri((struct sockaddr*)&peer_name);
+      } else {
+        char *utf8_message = gpr_format_message(WSAGetLastError());
+        gpr_log(GPR_ERROR, "getpeername error: %s", utf8_message);
+        gpr_free(utf8_message);
+      }
+      gpr_asprintf(&fd_name, "tcp_server:%s", peer_name_string);
+      ep = grpc_tcp_create(grpc_winsocket_create(sock, fd_name),
+                           peer_name_string);
+      gpr_free(fd_name);
+      gpr_free(peer_name_string);
     }
   }
 
diff --git a/src/core/iomgr/tcp_windows.c b/src/core/iomgr/tcp_windows.c
index 1bf81a73e0..89aa741470 100644
--- a/src/core/iomgr/tcp_windows.c
+++ b/src/core/iomgr/tcp_windows.c
@@ -96,6 +96,8 @@ typedef struct grpc_tcp {
      to protect ourselves when requesting a shutdown. */
   gpr_mu mu;
   int shutting_down;
+
+  char *peer_string;
 } grpc_tcp;
 
 static void tcp_ref(grpc_tcp *tcp) {
@@ -107,6 +109,7 @@ static void tcp_unref(grpc_tcp *tcp) {
     gpr_slice_buffer_destroy(&tcp->write_slices);
     grpc_winsocket_orphan(tcp->socket);
     gpr_mu_destroy(&tcp->mu);
+    gpr_free(tcp->peer_string);
     gpr_free(tcp);
   }
 }
@@ -365,8 +368,17 @@ static grpc_endpoint_write_status win_write(grpc_endpoint *ep,
   return GRPC_ENDPOINT_WRITE_PENDING;
 }
 
-static void win_add_to_pollset(grpc_endpoint *ep, grpc_pollset *pollset) {
-  grpc_tcp *tcp = (grpc_tcp *) ep;
+static void win_add_to_pollset(grpc_endpoint *ep, grpc_pollset *ps) {
+  grpc_tcp *tcp;
+  (void) ps;
+  tcp = (grpc_tcp *) ep;
+  grpc_iocp_add_socket(tcp->socket);
+}
+
+static void win_add_to_pollset_set(grpc_endpoint *ep, grpc_pollset_set *pss) {
+  grpc_tcp *tcp;
+  (void) pss;
+  tcp = (grpc_tcp *) ep;
   grpc_iocp_add_socket(tcp->socket);
 }
 
@@ -393,11 +405,17 @@ static void win_destroy(grpc_endpoint *ep) {
   tcp_unref(tcp);
 }
 
-static grpc_endpoint_vtable vtable = {
-  win_notify_on_read, win_write, win_add_to_pollset, win_shutdown, win_destroy
-};
+static char *win_get_peer(grpc_endpoint *ep) {
+  grpc_tcp *tcp = (grpc_tcp *)ep;
+  return gpr_strdup(tcp->peer_string);
+}
+
+static grpc_endpoint_vtable vtable = {win_notify_on_read, win_write,
+                                      win_add_to_pollset, win_add_to_pollset_set,
+                                      win_shutdown,       win_destroy,
+                                      win_get_peer};
 
-grpc_endpoint *grpc_tcp_create(grpc_winsocket *socket) {
+grpc_endpoint *grpc_tcp_create(grpc_winsocket *socket, char *peer_string) {
   grpc_tcp *tcp = (grpc_tcp *) gpr_malloc(sizeof(grpc_tcp));
   memset(tcp, 0, sizeof(grpc_tcp));
   tcp->base.vtable = &vtable;
@@ -405,6 +423,7 @@ grpc_endpoint *grpc_tcp_create(grpc_winsocket *socket) {
   gpr_mu_init(&tcp->mu);
   gpr_slice_buffer_init(&tcp->write_slices);
   gpr_ref_init(&tcp->refcount, 1);
+  tcp->peer_string = gpr_strdup(peer_string);
   return &tcp->base;
 }
 
diff --git a/src/core/iomgr/tcp_windows.h b/src/core/iomgr/tcp_windows.h
index 4cbc12c53a..7e301db250 100644
--- a/src/core/iomgr/tcp_windows.h
+++ b/src/core/iomgr/tcp_windows.h
@@ -50,7 +50,7 @@
 /* Create a tcp endpoint given a winsock handle.
  * Takes ownership of the handle.
  */
-grpc_endpoint *grpc_tcp_create(grpc_winsocket *socket);
+grpc_endpoint *grpc_tcp_create(grpc_winsocket *socket, char *peer_string);
 
 int grpc_tcp_prepare_socket(SOCKET sock);
 
diff --git a/src/core/iomgr/wakeup_fd_eventfd.c b/src/core/iomgr/wakeup_fd_eventfd.c
index 99c32bb9db..52912235f8 100644
--- a/src/core/iomgr/wakeup_fd_eventfd.c
+++ b/src/core/iomgr/wakeup_fd_eventfd.c
@@ -42,7 +42,7 @@
 #include "src/core/iomgr/wakeup_fd_posix.h"
 #include <grpc/support/log.h>
 
-static void eventfd_create(grpc_wakeup_fd_info *fd_info) {
+static void eventfd_create(grpc_wakeup_fd *fd_info) {
   int efd = eventfd(0, EFD_NONBLOCK | EFD_CLOEXEC);
   /* TODO(klempner): Handle failure more gracefully */
   GPR_ASSERT(efd >= 0);
@@ -50,7 +50,7 @@ static void eventfd_create(grpc_wakeup_fd_info *fd_info) {
   fd_info->write_fd = -1;
 }
 
-static void eventfd_consume(grpc_wakeup_fd_info *fd_info) {
+static void eventfd_consume(grpc_wakeup_fd *fd_info) {
   eventfd_t value;
   int err;
   do {
@@ -58,14 +58,14 @@ static void eventfd_consume(grpc_wakeup_fd_info *fd_info) {
   } while (err < 0 && errno == EINTR);
 }
 
-static void eventfd_wakeup(grpc_wakeup_fd_info *fd_info) {
+static void eventfd_wakeup(grpc_wakeup_fd *fd_info) {
   int err;
   do {
     err = eventfd_write(fd_info->read_fd, 1);
   } while (err < 0 && errno == EINTR);
 }
 
-static void eventfd_destroy(grpc_wakeup_fd_info *fd_info) {
+static void eventfd_destroy(grpc_wakeup_fd *fd_info) {
   close(fd_info->read_fd);
 }
 
diff --git a/src/core/iomgr/wakeup_fd_pipe.c b/src/core/iomgr/wakeup_fd_pipe.c
index f895478990..9fc4ee2388 100644
--- a/src/core/iomgr/wakeup_fd_pipe.c
+++ b/src/core/iomgr/wakeup_fd_pipe.c
@@ -44,7 +44,7 @@
 #include "src/core/iomgr/socket_utils_posix.h"
 #include <grpc/support/log.h>
 
-static void pipe_create(grpc_wakeup_fd_info *fd_info) {
+static void pipe_init(grpc_wakeup_fd *fd_info) {
   int pipefd[2];
   /* TODO(klempner): Make this nonfatal */
   GPR_ASSERT(0 == pipe(pipefd));
@@ -54,7 +54,7 @@ static void pipe_create(grpc_wakeup_fd_info *fd_info) {
   fd_info->write_fd = pipefd[1];
 }
 
-static void pipe_consume(grpc_wakeup_fd_info *fd_info) {
+static void pipe_consume(grpc_wakeup_fd *fd_info) {
   char buf[128];
   int r;
 
@@ -74,13 +74,13 @@ static void pipe_consume(grpc_wakeup_fd_info *fd_info) {
   }
 }
 
-static void pipe_wakeup(grpc_wakeup_fd_info *fd_info) {
+static void pipe_wakeup(grpc_wakeup_fd *fd_info) {
   char c = 0;
   while (write(fd_info->write_fd, &c, 1) != 1 && errno == EINTR)
     ;
 }
 
-static void pipe_destroy(grpc_wakeup_fd_info *fd_info) {
+static void pipe_destroy(grpc_wakeup_fd *fd_info) {
   close(fd_info->read_fd);
   close(fd_info->write_fd);
 }
@@ -91,7 +91,7 @@ static int pipe_check_availability(void) {
 }
 
 const grpc_wakeup_fd_vtable grpc_pipe_wakeup_fd_vtable = {
-  pipe_create, pipe_consume, pipe_wakeup, pipe_destroy, pipe_check_availability
-};
+    pipe_init, pipe_consume, pipe_wakeup, pipe_destroy,
+    pipe_check_availability};
 
 #endif  /* GPR_POSIX_WAKUP_FD */
diff --git a/src/core/iomgr/wakeup_fd_posix.c b/src/core/iomgr/wakeup_fd_posix.c
index d3cc3ec570..e48f5223fa 100644
--- a/src/core/iomgr/wakeup_fd_posix.c
+++ b/src/core/iomgr/wakeup_fd_posix.c
@@ -57,19 +57,19 @@ void grpc_wakeup_fd_global_destroy(void) {
   wakeup_fd_vtable = NULL;
 }
 
-void grpc_wakeup_fd_create(grpc_wakeup_fd_info *fd_info) {
-  wakeup_fd_vtable->create(fd_info);
+void grpc_wakeup_fd_init(grpc_wakeup_fd *fd_info) {
+  wakeup_fd_vtable->init(fd_info);
 }
 
-void grpc_wakeup_fd_consume_wakeup(grpc_wakeup_fd_info *fd_info) {
+void grpc_wakeup_fd_consume_wakeup(grpc_wakeup_fd *fd_info) {
   wakeup_fd_vtable->consume(fd_info);
 }
 
-void grpc_wakeup_fd_wakeup(grpc_wakeup_fd_info *fd_info) {
+void grpc_wakeup_fd_wakeup(grpc_wakeup_fd *fd_info) {
   wakeup_fd_vtable->wakeup(fd_info);
 }
 
-void grpc_wakeup_fd_destroy(grpc_wakeup_fd_info *fd_info) {
+void grpc_wakeup_fd_destroy(grpc_wakeup_fd *fd_info) {
   wakeup_fd_vtable->destroy(fd_info);
 }
 
diff --git a/src/core/iomgr/wakeup_fd_posix.h b/src/core/iomgr/wakeup_fd_posix.h
index 1b0ff70c7f..a4da4df51f 100644
--- a/src/core/iomgr/wakeup_fd_posix.h
+++ b/src/core/iomgr/wakeup_fd_posix.h
@@ -69,28 +69,28 @@ void grpc_wakeup_fd_global_destroy(void);
  * purposes only.*/
 void grpc_wakeup_fd_global_init_force_fallback(void);
 
-typedef struct grpc_wakeup_fd_info grpc_wakeup_fd_info;
+typedef struct grpc_wakeup_fd grpc_wakeup_fd;
 
 typedef struct grpc_wakeup_fd_vtable {
-  void (*create)(grpc_wakeup_fd_info *fd_info);
-  void (*consume)(grpc_wakeup_fd_info *fd_info);
-  void (*wakeup)(grpc_wakeup_fd_info *fd_info);
-  void (*destroy)(grpc_wakeup_fd_info *fd_info);
+  void (*init)(grpc_wakeup_fd *fd_info);
+  void (*consume)(grpc_wakeup_fd *fd_info);
+  void (*wakeup)(grpc_wakeup_fd *fd_info);
+  void (*destroy)(grpc_wakeup_fd *fd_info);
   /* Must be called before calling any other functions */
   int (*check_availability)(void);
 } grpc_wakeup_fd_vtable;
 
-struct grpc_wakeup_fd_info {
+struct grpc_wakeup_fd {
   int read_fd;
   int write_fd;
 };
 
 #define GRPC_WAKEUP_FD_GET_READ_FD(fd_info) ((fd_info)->read_fd)
 
-void grpc_wakeup_fd_create(grpc_wakeup_fd_info *fd_info);
-void grpc_wakeup_fd_consume_wakeup(grpc_wakeup_fd_info *fd_info);
-void grpc_wakeup_fd_wakeup(grpc_wakeup_fd_info *fd_info);
-void grpc_wakeup_fd_destroy(grpc_wakeup_fd_info *fd_info);
+void grpc_wakeup_fd_init(grpc_wakeup_fd *fd_info);
+void grpc_wakeup_fd_consume_wakeup(grpc_wakeup_fd *fd_info);
+void grpc_wakeup_fd_wakeup(grpc_wakeup_fd *fd_info);
+void grpc_wakeup_fd_destroy(grpc_wakeup_fd *fd_info);
 
 /* Defined in some specialized implementation's .c file, or by
  * wakeup_fd_nospecial.c if no such implementation exists. */
diff --git a/src/core/security/client_auth_filter.c b/src/core/security/client_auth_filter.c
index 9e49a807f1..0e699874bc 100644
--- a/src/core/security/client_auth_filter.c
+++ b/src/core/security/client_auth_filter.c
@@ -77,10 +77,9 @@ typedef struct {
 
 static void bubble_up_error(grpc_call_element *elem, const char *error_msg) {
   call_data *calld = elem->call_data;
-  channel_data *chand = elem->channel_data;
-  grpc_transport_stream_op_add_cancellation(
-      &calld->op, GRPC_STATUS_UNAUTHENTICATED,
-      grpc_mdstr_from_string(chand->md_ctx, error_msg));
+  gpr_log(GPR_ERROR, "Client side authentication failure: %s", error_msg);
+  grpc_transport_stream_op_add_cancellation(&calld->op,
+                                            GRPC_STATUS_UNAUTHENTICATED);
   grpc_call_next_op(elem, &calld->op);
 }
 
@@ -316,10 +315,10 @@ static void init_channel_elem(grpc_channel_element *elem, grpc_channel *master,
       (grpc_channel_security_connector *)GRPC_SECURITY_CONNECTOR_REF(
           sc, "client_auth_filter");
   chand->md_ctx = metadata_context;
-  chand->authority_string = grpc_mdstr_from_string(chand->md_ctx, ":authority");
-  chand->path_string = grpc_mdstr_from_string(chand->md_ctx, ":path");
-  chand->error_msg_key = grpc_mdstr_from_string(chand->md_ctx, "grpc-message");
-  chand->status_key = grpc_mdstr_from_string(chand->md_ctx, "grpc-status");
+  chand->authority_string = grpc_mdstr_from_string(chand->md_ctx, ":authority", 0);
+  chand->path_string = grpc_mdstr_from_string(chand->md_ctx, ":path", 0);
+  chand->error_msg_key = grpc_mdstr_from_string(chand->md_ctx, "grpc-message", 0);
+  chand->status_key = grpc_mdstr_from_string(chand->md_ctx, "grpc-status", 0);
 }
 
 /* Destructor for channel data */
@@ -344,6 +343,8 @@ static void destroy_channel_elem(grpc_channel_element *elem) {
 }
 
 const grpc_channel_filter grpc_client_auth_filter = {
-    auth_start_transport_op, grpc_channel_next_op, sizeof(call_data),
-    init_call_elem,          destroy_call_elem,    sizeof(channel_data),
-    init_channel_elem,       destroy_channel_elem, "client-auth"};
+    auth_start_transport_op, grpc_channel_next_op,
+    sizeof(call_data),       init_call_elem,
+    destroy_call_elem,       sizeof(channel_data),
+    init_channel_elem,       destroy_channel_elem,
+    grpc_call_next_get_peer, "client-auth"};
diff --git a/src/core/security/credentials.c b/src/core/security/credentials.c
index fb59fa4b0e..6421ce673d 100644
--- a/src/core/security/credentials.c
+++ b/src/core/security/credentials.c
@@ -149,6 +149,12 @@ grpc_security_status grpc_server_credentials_create_security_connector(
   return creds->vtable->create_security_connector(creds, sc);
 }
 
+void grpc_server_credentials_set_auth_metadata_processor(
+    grpc_server_credentials *creds, grpc_auth_metadata_processor processor) {
+  if (creds == NULL) return;
+  creds->processor = processor;
+}
+
 /* -- Ssl credentials. -- */
 
 static void ssl_destroy(grpc_credentials *creds) {
@@ -259,8 +265,10 @@ static void ssl_build_config(const char *pem_root_certs,
 
 static void ssl_build_server_config(
     const char *pem_root_certs, grpc_ssl_pem_key_cert_pair *pem_key_cert_pairs,
-    size_t num_key_cert_pairs, grpc_ssl_server_config *config) {
+    size_t num_key_cert_pairs, int force_client_auth,
+    grpc_ssl_server_config *config) {
   size_t i;
+  config->force_client_auth = force_client_auth;
   if (pem_root_certs != NULL) {
     ssl_copy_key_material(pem_root_certs, &config->pem_root_certs,
                           &config->pem_root_certs_size);
@@ -302,20 +310,20 @@ grpc_credentials *grpc_ssl_credentials_create(
 
 grpc_server_credentials *grpc_ssl_server_credentials_create(
     const char *pem_root_certs, grpc_ssl_pem_key_cert_pair *pem_key_cert_pairs,
-    size_t num_key_cert_pairs) {
+    size_t num_key_cert_pairs, int force_client_auth) {
   grpc_ssl_server_credentials *c =
       gpr_malloc(sizeof(grpc_ssl_server_credentials));
   memset(c, 0, sizeof(grpc_ssl_server_credentials));
   c->base.type = GRPC_CREDENTIALS_TYPE_SSL;
   c->base.vtable = &ssl_server_vtable;
   ssl_build_server_config(pem_root_certs, pem_key_cert_pairs,
-                          num_key_cert_pairs, &c->config);
+                          num_key_cert_pairs, force_client_auth, &c->config);
   return &c->base;
 }
 
 /* -- Jwt credentials -- */
 
-static void jwt_reset_cache(grpc_jwt_credentials *c) {
+static void jwt_reset_cache(grpc_service_account_jwt_access_credentials *c) {
   if (c->cached.jwt_md != NULL) {
     grpc_credentials_md_store_unref(c->cached.jwt_md);
     c->cached.jwt_md = NULL;
@@ -328,7 +336,8 @@ static void jwt_reset_cache(grpc_jwt_credentials *c) {
 }
 
 static void jwt_destroy(grpc_credentials *creds) {
-  grpc_jwt_credentials *c = (grpc_jwt_credentials *)creds;
+  grpc_service_account_jwt_access_credentials *c =
+      (grpc_service_account_jwt_access_credentials *)creds;
   grpc_auth_json_key_destruct(&c->key);
   jwt_reset_cache(c);
   gpr_mu_destroy(&c->cache_mu);
@@ -346,7 +355,8 @@ static void jwt_get_request_metadata(grpc_credentials *creds,
                                      const char *service_url,
                                      grpc_credentials_metadata_cb cb,
                                      void *user_data) {
-  grpc_jwt_credentials *c = (grpc_jwt_credentials *)creds;
+  grpc_service_account_jwt_access_credentials *c =
+      (grpc_service_account_jwt_access_credentials *)creds;
   gpr_timespec refresh_threshold = gpr_time_from_seconds(
       GRPC_SECURE_TOKEN_REFRESH_THRESHOLD_SECS, GPR_TIMESPAN);
 
@@ -399,15 +409,16 @@ static grpc_credentials_vtable jwt_vtable = {
     jwt_destroy, jwt_has_request_metadata, jwt_has_request_metadata_only,
     jwt_get_request_metadata, NULL};
 
-grpc_credentials *grpc_jwt_credentials_create_from_auth_json_key(
+grpc_credentials *
+grpc_service_account_jwt_access_credentials_create_from_auth_json_key(
     grpc_auth_json_key key, gpr_timespec token_lifetime) {
-  grpc_jwt_credentials *c;
+  grpc_service_account_jwt_access_credentials *c;
   if (!grpc_auth_json_key_is_valid(&key)) {
     gpr_log(GPR_ERROR, "Invalid input for jwt credentials creation");
     return NULL;
   }
-  c = gpr_malloc(sizeof(grpc_jwt_credentials));
-  memset(c, 0, sizeof(grpc_jwt_credentials));
+  c = gpr_malloc(sizeof(grpc_service_account_jwt_access_credentials));
+  memset(c, 0, sizeof(grpc_service_account_jwt_access_credentials));
   c->base.type = GRPC_CREDENTIALS_TYPE_JWT;
   gpr_ref_init(&c->base.refcount, 1);
   c->base.vtable = &jwt_vtable;
@@ -418,9 +429,9 @@ grpc_credentials *grpc_jwt_credentials_create_from_auth_json_key(
   return &c->base;
 }
 
-grpc_credentials *grpc_jwt_credentials_create(const char *json_key,
-                                              gpr_timespec token_lifetime) {
-  return grpc_jwt_credentials_create_from_auth_json_key(
+grpc_credentials *grpc_service_account_jwt_access_credentials_create(
+    const char *json_key, gpr_timespec token_lifetime) {
+  return grpc_service_account_jwt_access_credentials_create_from_auth_json_key(
       grpc_auth_json_key_create_from_string(json_key), token_lifetime);
 }
 
@@ -674,7 +685,7 @@ static void service_account_fetch_oauth2(
   request.path = GRPC_GOOGLE_OAUTH2_SERVICE_TOKEN_PATH;
   request.hdr_count = 1;
   request.hdrs = &header;
-  request.use_ssl = 1;
+  request.handshaker = &grpc_httpcli_ssl;
   grpc_httpcli_post(httpcli_context, pollset, &request, body, strlen(body),
                     deadline, response_cb, metadata_req);
   gpr_free(body);
@@ -733,7 +744,7 @@ static void refresh_token_fetch_oauth2(
   request.path = GRPC_GOOGLE_OAUTH2_SERVICE_TOKEN_PATH;
   request.hdr_count = 1;
   request.hdrs = &header;
-  request.use_ssl = 1;
+  request.handshaker = &grpc_httpcli_ssl;
   grpc_httpcli_post(httpcli_context, pollset, &request, body, strlen(body),
                     deadline, response_cb, metadata_req);
   gpr_free(body);
@@ -760,19 +771,19 @@ grpc_credentials *grpc_refresh_token_credentials_create(
       grpc_auth_refresh_token_create_from_string(json_refresh_token));
 }
 
-/* -- Fake Oauth2 credentials. -- */
+/* -- Metadata-only credentials. -- */
 
-static void fake_oauth2_destroy(grpc_credentials *creds) {
-  grpc_fake_oauth2_credentials *c = (grpc_fake_oauth2_credentials *)creds;
-  grpc_credentials_md_store_unref(c->access_token_md);
+static void md_only_test_destroy(grpc_credentials *creds) {
+  grpc_md_only_test_credentials *c = (grpc_md_only_test_credentials *)creds;
+  grpc_credentials_md_store_unref(c->md_store);
   gpr_free(c);
 }
 
-static int fake_oauth2_has_request_metadata(const grpc_credentials *creds) {
+static int md_only_test_has_request_metadata(const grpc_credentials *creds) {
   return 1;
 }
 
-static int fake_oauth2_has_request_metadata_only(
+static int md_only_test_has_request_metadata_only(
     const grpc_credentials *creds) {
   return 1;
 }
@@ -780,19 +791,19 @@ static int fake_oauth2_has_request_metadata_only(
 void on_simulated_token_fetch_done(void *user_data, int success) {
   grpc_credentials_metadata_request *r =
       (grpc_credentials_metadata_request *)user_data;
-  grpc_fake_oauth2_credentials *c = (grpc_fake_oauth2_credentials *)r->creds;
+  grpc_md_only_test_credentials *c = (grpc_md_only_test_credentials *)r->creds;
   GPR_ASSERT(success);
-  r->cb(r->user_data, c->access_token_md->entries,
-        c->access_token_md->num_entries, GRPC_CREDENTIALS_OK);
+  r->cb(r->user_data, c->md_store->entries,
+        c->md_store->num_entries, GRPC_CREDENTIALS_OK);
   grpc_credentials_metadata_request_destroy(r);
 }
 
-static void fake_oauth2_get_request_metadata(grpc_credentials *creds,
+static void md_only_test_get_request_metadata(grpc_credentials *creds,
                                              grpc_pollset *pollset,
                                              const char *service_url,
                                              grpc_credentials_metadata_cb cb,
                                              void *user_data) {
-  grpc_fake_oauth2_credentials *c = (grpc_fake_oauth2_credentials *)creds;
+  grpc_md_only_test_credentials *c = (grpc_md_only_test_credentials *)creds;
 
   if (c->is_async) {
     grpc_credentials_metadata_request *cb_arg =
@@ -801,26 +812,26 @@ static void fake_oauth2_get_request_metadata(grpc_credentials *creds,
                             on_simulated_token_fetch_done, cb_arg);
     grpc_iomgr_add_callback(cb_arg->on_simulated_token_fetch_done_closure);
   } else {
-    cb(user_data, c->access_token_md->entries, 1, GRPC_CREDENTIALS_OK);
+    cb(user_data, c->md_store->entries, 1, GRPC_CREDENTIALS_OK);
   }
 }
 
-static grpc_credentials_vtable fake_oauth2_vtable = {
-    fake_oauth2_destroy, fake_oauth2_has_request_metadata,
-    fake_oauth2_has_request_metadata_only, fake_oauth2_get_request_metadata,
+static grpc_credentials_vtable md_only_test_vtable = {
+    md_only_test_destroy, md_only_test_has_request_metadata,
+    md_only_test_has_request_metadata_only, md_only_test_get_request_metadata,
     NULL};
 
-grpc_credentials *grpc_fake_oauth2_credentials_create(
-    const char *token_md_value, int is_async) {
-  grpc_fake_oauth2_credentials *c =
-      gpr_malloc(sizeof(grpc_fake_oauth2_credentials));
-  memset(c, 0, sizeof(grpc_fake_oauth2_credentials));
+grpc_credentials *grpc_md_only_test_credentials_create(const char *md_key,
+                                                       const char *md_value,
+                                                       int is_async) {
+  grpc_md_only_test_credentials *c =
+      gpr_malloc(sizeof(grpc_md_only_test_credentials));
+  memset(c, 0, sizeof(grpc_md_only_test_credentials));
   c->base.type = GRPC_CREDENTIALS_TYPE_OAUTH2;
-  c->base.vtable = &fake_oauth2_vtable;
+  c->base.vtable = &md_only_test_vtable;
   gpr_ref_init(&c->base.refcount, 1);
-  c->access_token_md = grpc_credentials_md_store_create(1);
-  grpc_credentials_md_store_add_cstrings(
-      c->access_token_md, GRPC_AUTHORIZATION_METADATA_KEY, token_md_value);
+  c->md_store = grpc_credentials_md_store_create(1);
+  grpc_credentials_md_store_add_cstrings(c->md_store, md_key, md_value);
   c->is_async = is_async;
   return &c->base;
 }
diff --git a/src/core/security/credentials.h b/src/core/security/credentials.h
index d988901cf7..04736525dc 100644
--- a/src/core/security/credentials.h
+++ b/src/core/security/credentials.h
@@ -52,6 +52,8 @@ typedef enum {
   GRPC_CREDENTIALS_ERROR
 } grpc_credentials_status;
 
+#define GRPC_FAKE_TRANSPORT_SECURITY_TYPE "fake"
+
 #define GRPC_CREDENTIALS_TYPE_SSL "Ssl"
 #define GRPC_CREDENTIALS_TYPE_OAUTH2 "Oauth2"
 #define GRPC_CREDENTIALS_TYPE_JWT "Jwt"
@@ -112,6 +114,12 @@ void grpc_credentials_md_store_unref(grpc_credentials_md_store *store);
 
 /* --- grpc_credentials. --- */
 
+/* Creates a fake transport security credentials object for testing. */
+grpc_credentials *grpc_fake_transport_security_credentials_create(void);
+/* Creates a fake server transport security credentials object for testing. */
+grpc_server_credentials *grpc_fake_transport_security_server_credentials_create(
+    void);
+
 /* It is the caller's responsibility to gpr_free the result if not NULL. */
 char *grpc_get_well_known_google_credentials_file_path(void);
 
@@ -182,13 +190,15 @@ grpc_oauth2_token_fetcher_credentials_parse_server_response(
     grpc_credentials_md_store **token_md, gpr_timespec *token_lifetime);
 void grpc_flush_cached_google_default_credentials(void);
 
-/* Simulates an oauth2 token fetch with the specified value for testing. */
-grpc_credentials *grpc_fake_oauth2_credentials_create(
-    const char *token_md_value, int is_async);
+/* Metadata-only credentials with the specified key and value where
+   asynchronicity can be simulated for testing. */
+grpc_credentials *grpc_md_only_test_credentials_create(
+    const char *md_key, const char *md_value, int is_async);
 
 /* Private constructor for jwt credentials from an already parsed json key.
    Takes ownership of the key. */
-grpc_credentials *grpc_jwt_credentials_create_from_auth_json_key(
+grpc_credentials *
+grpc_service_account_jwt_access_credentials_create_from_auth_json_key(
     grpc_auth_json_key key, gpr_timespec token_lifetime);
 
 /* Private constructor for refresh token credentials from an already parsed
@@ -207,6 +217,7 @@ typedef struct {
 struct grpc_server_credentials {
   const grpc_server_credentials_vtable *vtable;
   const char *type;
+  grpc_auth_metadata_processor processor;
 };
 
 grpc_security_status grpc_server_credentials_create_security_connector(
@@ -240,7 +251,7 @@ typedef struct {
 
   grpc_auth_json_key key;
   gpr_timespec jwt_lifetime;
-} grpc_jwt_credentials;
+} grpc_service_account_jwt_access_credentials;
 
 /* -- Oauth2TokenFetcher credentials --
 
@@ -288,13 +299,13 @@ typedef struct {
   grpc_credentials_md_store *access_token_md;
 } grpc_access_token_credentials;
 
-/* -- Fake Oauth2 credentials. -- */
+/* --  Metadata-only Test credentials. -- */
 
 typedef struct {
   grpc_credentials base;
-  grpc_credentials_md_store *access_token_md;
+  grpc_credentials_md_store *md_store;
   int is_async;
-} grpc_fake_oauth2_credentials;
+} grpc_md_only_test_credentials;
 
 /* -- IAM credentials. -- */
 
diff --git a/src/core/security/google_default_credentials.c b/src/core/security/google_default_credentials.c
index 833484310f..f368819597 100644
--- a/src/core/security/google_default_credentials.c
+++ b/src/core/security/google_default_credentials.c
@@ -80,7 +80,7 @@ static void on_compute_engine_detection_http_response(
   }
   gpr_mu_lock(GRPC_POLLSET_MU(&detector->pollset));
   detector->is_done = 1;
-  grpc_pollset_kick(&detector->pollset);
+  grpc_pollset_kick(&detector->pollset, NULL);
   gpr_mu_unlock(GRPC_POLLSET_MU(&detector->pollset));
 }
 
@@ -112,7 +112,9 @@ static int is_stack_running_on_compute_engine(void) {
      called once for the lifetime of the process by the default credentials. */
   gpr_mu_lock(GRPC_POLLSET_MU(&detector.pollset));
   while (!detector.is_done) {
-    grpc_pollset_work(&detector.pollset, gpr_inf_future(GPR_CLOCK_REALTIME));
+    grpc_pollset_worker worker;
+    grpc_pollset_work(&detector.pollset, &worker,
+                      gpr_inf_future(GPR_CLOCK_REALTIME));
   }
   gpr_mu_unlock(GRPC_POLLSET_MU(&detector.pollset));
 
@@ -140,8 +142,9 @@ static grpc_credentials *create_default_creds_from_path(char *creds_path) {
   /* First, try an auth json key. */
   key = grpc_auth_json_key_create_from_json(json);
   if (grpc_auth_json_key_is_valid(&key)) {
-    result = grpc_jwt_credentials_create_from_auth_json_key(
-        key, grpc_max_auth_token_lifetime);
+    result =
+        grpc_service_account_jwt_access_credentials_create_from_auth_json_key(
+            key, grpc_max_auth_token_lifetime);
     goto end;
   }
 
diff --git a/src/core/security/jwt_verifier.c b/src/core/security/jwt_verifier.c
index 1276693da7..38ad134a6a 100644
--- a/src/core/security/jwt_verifier.c
+++ b/src/core/security/jwt_verifier.c
@@ -628,7 +628,7 @@ static void on_openid_config_retrieved(void *user_data,
     goto error;
   }
   jwks_uri += 8;
-  req.use_ssl = 1;
+  req.handshaker = &grpc_httpcli_ssl;
   req.host = gpr_strdup(jwks_uri);
   req.path = strchr(jwks_uri, '/');
   if (req.path == NULL) {
@@ -685,7 +685,7 @@ static void retrieve_key_and_verify(verifier_cb_ctx *ctx) {
   const char *iss;
   grpc_httpcli_request req;
   memset(&req, 0, sizeof(grpc_httpcli_request));
-  req.use_ssl = 1;
+  req.handshaker = &grpc_httpcli_ssl;
 
   GPR_ASSERT(ctx != NULL && ctx->header != NULL && ctx->claims != NULL);
   iss = ctx->claims->iss;
diff --git a/src/core/security/secure_endpoint.c b/src/core/security/secure_endpoint.c
index 3548198046..95fbf71f3d 100644
--- a/src/core/security/secure_endpoint.c
+++ b/src/core/security/secure_endpoint.c
@@ -331,9 +331,22 @@ static void endpoint_add_to_pollset(grpc_endpoint *secure_ep,
   grpc_endpoint_add_to_pollset(ep->wrapped_ep, pollset);
 }
 
+static void endpoint_add_to_pollset_set(grpc_endpoint *secure_ep,
+                                    grpc_pollset_set *pollset_set) {
+  secure_endpoint *ep = (secure_endpoint *)secure_ep;
+  grpc_endpoint_add_to_pollset_set(ep->wrapped_ep, pollset_set);
+}
+
+static char *endpoint_get_peer(grpc_endpoint *secure_ep) {
+  secure_endpoint *ep = (secure_endpoint *)secure_ep;
+  return grpc_endpoint_get_peer(ep->wrapped_ep);
+}
+
 static const grpc_endpoint_vtable vtable = {
-    endpoint_notify_on_read, endpoint_write, endpoint_add_to_pollset,
-    endpoint_shutdown, endpoint_unref};
+    endpoint_notify_on_read, endpoint_write,
+    endpoint_add_to_pollset, endpoint_add_to_pollset_set,
+    endpoint_shutdown,       endpoint_unref,
+    endpoint_get_peer};
 
 grpc_endpoint *grpc_secure_endpoint_create(
     struct tsi_frame_protector *protector, grpc_endpoint *transport,
diff --git a/src/core/security/security_connector.c b/src/core/security/security_connector.c
index f6e423eb27..a354536dcd 100644
--- a/src/core/security/security_connector.c
+++ b/src/core/security/security_connector.c
@@ -263,9 +263,9 @@ static grpc_security_status fake_check_peer(grpc_security_connector *sc,
     goto end;
   }
   GRPC_AUTH_CONTEXT_UNREF(sc->auth_context, "connector");
-  sc->auth_context = grpc_auth_context_create(NULL, 1);
-  sc->auth_context->properties[0] = grpc_auth_property_init_from_cstring(
-      GRPC_TRANSPORT_SECURITY_TYPE_PROPERTY_NAME,
+  sc->auth_context = grpc_auth_context_create(NULL);
+  grpc_auth_context_add_cstring_property(
+      sc->auth_context, GRPC_TRANSPORT_SECURITY_TYPE_PROPERTY_NAME,
       GRPC_FAKE_TRANSPORT_SECURITY_TYPE);
 
 end:
@@ -409,31 +409,35 @@ static int ssl_host_matches_name(const tsi_peer *peer, const char *peer_name) {
 grpc_auth_context *tsi_ssl_peer_to_auth_context(const tsi_peer *peer) {
   size_t i;
   grpc_auth_context *ctx = NULL;
+  const char *peer_identity_property_name = NULL;
 
   /* The caller has checked the certificate type property. */
   GPR_ASSERT(peer->property_count >= 1);
-  ctx = grpc_auth_context_create(NULL, peer->property_count);
-  ctx->properties[0] = grpc_auth_property_init_from_cstring(
-      GRPC_TRANSPORT_SECURITY_TYPE_PROPERTY_NAME,
+  ctx = grpc_auth_context_create(NULL);
+  grpc_auth_context_add_cstring_property(
+      ctx, GRPC_TRANSPORT_SECURITY_TYPE_PROPERTY_NAME,
       GRPC_SSL_TRANSPORT_SECURITY_TYPE);
-  ctx->property_count = 1;
   for (i = 0; i < peer->property_count; i++) {
     const tsi_peer_property *prop = &peer->properties[i];
     if (prop->name == NULL) continue;
     if (strcmp(prop->name, TSI_X509_SUBJECT_COMMON_NAME_PEER_PROPERTY) == 0) {
       /* If there is no subject alt name, have the CN as the identity. */
-      if (ctx->peer_identity_property_name == NULL) {
-        ctx->peer_identity_property_name = GRPC_X509_CN_PROPERTY_NAME;
+      if (peer_identity_property_name == NULL) {
+        peer_identity_property_name = GRPC_X509_CN_PROPERTY_NAME;
       }
-      ctx->properties[ctx->property_count++] = grpc_auth_property_init(
-          GRPC_X509_CN_PROPERTY_NAME, prop->value.data, prop->value.length);
+      grpc_auth_context_add_property(ctx, GRPC_X509_CN_PROPERTY_NAME,
+                                     prop->value.data, prop->value.length);
     } else if (strcmp(prop->name,
                       TSI_X509_SUBJECT_ALTERNATIVE_NAME_PEER_PROPERTY) == 0) {
-      ctx->peer_identity_property_name = GRPC_X509_SAN_PROPERTY_NAME;
-      ctx->properties[ctx->property_count++] = grpc_auth_property_init(
-          GRPC_X509_SAN_PROPERTY_NAME, prop->value.data, prop->value.length);
+      peer_identity_property_name = GRPC_X509_SAN_PROPERTY_NAME;
+      grpc_auth_context_add_property(ctx, GRPC_X509_SAN_PROPERTY_NAME,
+                                     prop->value.data, prop->value.length);
     }
   }
+  if (peer_identity_property_name != NULL) {
+    GPR_ASSERT(grpc_auth_context_set_peer_identity_property_name(
+                   ctx, peer_identity_property_name) == 1);
+  }
   return ctx;
 }
 
@@ -653,9 +657,10 @@ grpc_security_status grpc_ssl_server_security_connector_create(
       config->pem_private_keys_sizes,
       (const unsigned char **)config->pem_cert_chains,
       config->pem_cert_chains_sizes, config->num_key_cert_pairs,
-      config->pem_root_certs, config->pem_root_certs_size, ssl_cipher_suites(),
-      alpn_protocol_strings, alpn_protocol_string_lengths,
-      (uint16_t)num_alpn_protocols, &c->handshaker_factory);
+      config->pem_root_certs, config->pem_root_certs_size,
+      config->force_client_auth, ssl_cipher_suites(), alpn_protocol_strings,
+      alpn_protocol_string_lengths, (uint16_t)num_alpn_protocols,
+      &c->handshaker_factory);
   if (result != TSI_OK) {
     gpr_log(GPR_ERROR, "Handshaker factory creation failed with %s.",
             tsi_result_to_string(result));
diff --git a/src/core/security/security_connector.h b/src/core/security/security_connector.h
index a4c723f026..2c9aa1c5a4 100644
--- a/src/core/security/security_connector.h
+++ b/src/core/security/security_connector.h
@@ -201,6 +201,7 @@ typedef struct {
   size_t num_key_cert_pairs;
   unsigned char *pem_root_certs;
   size_t pem_root_certs_size;
+  int force_client_auth;
 } grpc_ssl_server_config;
 
 /* Creates an SSL server_security_connector.
diff --git a/src/core/security/security_context.c b/src/core/security/security_context.c
index 8ce7876bd8..1ef0fc9255 100644
--- a/src/core/security/security_context.c
+++ b/src/core/security/security_context.c
@@ -42,6 +42,19 @@
 #include <grpc/support/log.h>
 #include <grpc/support/string_util.h>
 
+/* --- grpc_process_auth_metadata_func --- */
+
+static grpc_auth_metadata_processor server_processor = {NULL, NULL};
+
+grpc_auth_metadata_processor grpc_server_get_auth_metadata_processor(void) {
+  return server_processor;
+}
+
+void grpc_server_register_auth_metadata_processor(
+    grpc_auth_metadata_processor processor) {
+  server_processor = processor;
+}
+
 /* --- grpc_call --- */
 
 grpc_call_error grpc_call_set_credentials(grpc_call *call,
@@ -120,15 +133,15 @@ void grpc_server_security_context_destroy(void *ctx) {
 
 static grpc_auth_property_iterator empty_iterator = {NULL, 0, NULL};
 
-grpc_auth_context *grpc_auth_context_create(grpc_auth_context *chained,
-                                            size_t property_count) {
+grpc_auth_context *grpc_auth_context_create(grpc_auth_context *chained) {
   grpc_auth_context *ctx = gpr_malloc(sizeof(grpc_auth_context));
   memset(ctx, 0, sizeof(grpc_auth_context));
-  ctx->properties = gpr_malloc(property_count * sizeof(grpc_auth_property));
-  memset(ctx->properties, 0, property_count * sizeof(grpc_auth_property));
-  ctx->property_count = property_count;
   gpr_ref_init(&ctx->refcount, 1);
-  if (chained != NULL) ctx->chained = GRPC_AUTH_CONTEXT_REF(chained, "chained");
+  if (chained != NULL) {
+    ctx->chained = GRPC_AUTH_CONTEXT_REF(chained, "chained");
+    ctx->peer_identity_property_name =
+        ctx->chained->peer_identity_property_name;
+  }
   return ctx;
 }
 
@@ -162,11 +175,11 @@ void grpc_auth_context_unref(grpc_auth_context *ctx) {
   if (gpr_unref(&ctx->refcount)) {
     size_t i;
     GRPC_AUTH_CONTEXT_UNREF(ctx->chained, "chained");
-    if (ctx->properties != NULL) {
-      for (i = 0; i < ctx->property_count; i++) {
-        grpc_auth_property_reset(&ctx->properties[i]);
+    if (ctx->properties.array != NULL) {
+      for (i = 0; i < ctx->properties.count; i++) {
+        grpc_auth_property_reset(&ctx->properties.array[i]);
       }
-      gpr_free(ctx->properties);
+      gpr_free(ctx->properties.array);
     }
     gpr_free(ctx);
   }
@@ -177,6 +190,20 @@ const char *grpc_auth_context_peer_identity_property_name(
   return ctx->peer_identity_property_name;
 }
 
+int grpc_auth_context_set_peer_identity_property_name(grpc_auth_context *ctx,
+                                                      const char *name) {
+  grpc_auth_property_iterator it =
+      grpc_auth_context_find_properties_by_name(ctx, name);
+  const grpc_auth_property *prop = grpc_auth_property_iterator_next(&it);
+  if (prop == NULL) {
+    gpr_log(GPR_ERROR, "Property name %s not found in auth context.",
+            name != NULL ? name : "NULL");
+    return 0;
+  }
+  ctx->peer_identity_property_name = prop->name;
+  return 1;
+}
+
 int grpc_auth_context_peer_is_authenticated(
     const grpc_auth_context *ctx) {
   return ctx->peer_identity_property_name == NULL ? 0 : 1;
@@ -193,16 +220,16 @@ grpc_auth_property_iterator grpc_auth_context_property_iterator(
 const grpc_auth_property *grpc_auth_property_iterator_next(
     grpc_auth_property_iterator *it) {
   if (it == NULL || it->ctx == NULL) return NULL;
-  while (it->index == it->ctx->property_count) {
+  while (it->index == it->ctx->properties.count) {
     if (it->ctx->chained == NULL) return NULL;
     it->ctx = it->ctx->chained;
     it->index = 0;
   }
   if (it->name == NULL) {
-    return &it->ctx->properties[it->index++];
+    return &it->ctx->properties.array[it->index++];
   } else {
-    while (it->index < it->ctx->property_count) {
-      const grpc_auth_property *prop = &it->ctx->properties[it->index++];
+    while (it->index < it->ctx->properties.count) {
+      const grpc_auth_property *prop = &it->ctx->properties.array[it->index++];
       GPR_ASSERT(prop->name != NULL);
       if (strcmp(it->name, prop->name) == 0) {
         return prop;
@@ -229,24 +256,37 @@ grpc_auth_property_iterator grpc_auth_context_peer_identity(
       ctx, ctx->peer_identity_property_name);
 }
 
-grpc_auth_property grpc_auth_property_init_from_cstring(const char *name,
-                                                        const char *value) {
-  grpc_auth_property prop;
-  prop.name = gpr_strdup(name);
-  prop.value = gpr_strdup(value);
-  prop.value_length = strlen(value);
-  return prop;
+static void ensure_auth_context_capacity(grpc_auth_context *ctx) {
+  if (ctx->properties.count == ctx->properties.capacity) {
+    ctx->properties.capacity =
+        GPR_MAX(ctx->properties.capacity + 8, ctx->properties.capacity * 2);
+    ctx->properties.array =
+        gpr_realloc(ctx->properties.array,
+                    ctx->properties.capacity * sizeof(grpc_auth_property));
+  }
 }
 
-grpc_auth_property grpc_auth_property_init(const char *name, const char *value,
-                                           size_t value_length) {
-  grpc_auth_property prop;
-  prop.name = gpr_strdup(name);
-  prop.value = gpr_malloc(value_length + 1);
-  memcpy(prop.value, value, value_length);
-  prop.value[value_length] = '\0';
-  prop.value_length = value_length;
-  return prop;
+void grpc_auth_context_add_property(grpc_auth_context *ctx, const char *name,
+                                    const char *value, size_t value_length) {
+  grpc_auth_property *prop;
+  ensure_auth_context_capacity(ctx);
+  prop = &ctx->properties.array[ctx->properties.count++];
+  prop->name = gpr_strdup(name);
+  prop->value = gpr_malloc(value_length + 1);
+  memcpy(prop->value, value, value_length);
+  prop->value[value_length] = '\0';
+  prop->value_length = value_length;
+}
+
+void grpc_auth_context_add_cstring_property(grpc_auth_context *ctx,
+                                            const char *name,
+                                            const char *value) {
+  grpc_auth_property *prop;
+  ensure_auth_context_capacity(ctx);
+  prop = &ctx->properties.array[ctx->properties.count++];
+  prop->name = gpr_strdup(name);
+  prop->value = gpr_strdup(value);
+  prop->value_length = strlen(value);
 }
 
 void grpc_auth_property_reset(grpc_auth_property *property) {
@@ -255,3 +295,35 @@ void grpc_auth_property_reset(grpc_auth_property *property) {
   memset(property, 0, sizeof(grpc_auth_property));
 }
 
+grpc_arg grpc_auth_metadata_processor_to_arg(grpc_auth_metadata_processor *p) {
+  grpc_arg arg;
+  memset(&arg, 0, sizeof(grpc_arg));
+  arg.type = GRPC_ARG_POINTER;
+  arg.key = GRPC_AUTH_METADATA_PROCESSOR_ARG;
+  arg.value.pointer.p = p;
+  return arg;
+}
+
+grpc_auth_metadata_processor *grpc_auth_metadata_processor_from_arg(
+    const grpc_arg *arg) {
+  if (strcmp(arg->key, GRPC_AUTH_METADATA_PROCESSOR_ARG) != 0) return NULL;
+  if (arg->type != GRPC_ARG_POINTER) {
+    gpr_log(GPR_ERROR, "Invalid type %d for arg %s", arg->type,
+            GRPC_AUTH_METADATA_PROCESSOR_ARG);
+    return NULL;
+  }
+  return arg->value.pointer.p;
+}
+
+grpc_auth_metadata_processor *grpc_find_auth_metadata_processor_in_args(
+    const grpc_channel_args *args) {
+  size_t i;
+  if (args == NULL) return NULL;
+  for (i = 0; i < args->num_args; i++) {
+    grpc_auth_metadata_processor *p =
+        grpc_auth_metadata_processor_from_arg(&args->args[i]);
+    if (p != NULL) return p;
+  }
+  return NULL;
+}
+
diff --git a/src/core/security/security_context.h b/src/core/security/security_context.h
index 76a45910bb..7fcd438cf6 100644
--- a/src/core/security/security_context.h
+++ b/src/core/security/security_context.h
@@ -34,29 +34,31 @@
 #ifndef GRPC_INTERNAL_CORE_SECURITY_SECURITY_CONTEXT_H
 #define GRPC_INTERNAL_CORE_SECURITY_SECURITY_CONTEXT_H
 
+#include "src/core/iomgr/pollset.h"
 #include "src/core/security/credentials.h"
 
-#ifdef __cplusplus
-extern "C" {
-#endif
-
 /* --- grpc_auth_context ---
 
    High level authentication context object. Can optionally be chained. */
 
 /* Property names are always NULL terminated. */
 
+typedef struct {
+  grpc_auth_property *array;
+  size_t count;
+  size_t capacity;
+} grpc_auth_property_array;
+
 struct grpc_auth_context {
   struct grpc_auth_context *chained;
-  grpc_auth_property *properties;
-  size_t property_count;
+  grpc_auth_property_array properties;
   gpr_refcount refcount;
   const char *peer_identity_property_name;
+  grpc_pollset *pollset;
 };
 
-/* Constructor. */
-grpc_auth_context *grpc_auth_context_create(grpc_auth_context *chained,
-                                            size_t property_count);
+/* Creation. */
+grpc_auth_context *grpc_auth_context_create(grpc_auth_context *chained);
 
 /* Refcounting. */
 #ifdef GRPC_AUTH_CONTEXT_REFCOUNT_DEBUG
@@ -76,12 +78,6 @@ grpc_auth_context *grpc_auth_context_ref(grpc_auth_context *policy);
 void grpc_auth_context_unref(grpc_auth_context *policy);
 #endif
 
-grpc_auth_property grpc_auth_property_init_from_cstring(const char *name,
-                                                        const char *value);
-
-grpc_auth_property grpc_auth_property_init(const char *name, const char *value,
-                                           size_t value_length);
-
 void grpc_auth_property_reset(grpc_auth_property *property);
 
 /* --- grpc_client_security_context ---
@@ -107,9 +103,14 @@ typedef struct {
 grpc_server_security_context *grpc_server_security_context_create(void);
 void grpc_server_security_context_destroy(void *ctx);
 
-#ifdef __cplusplus
-}
-#endif
+/* --- Auth metadata processing. --- */
+#define GRPC_AUTH_METADATA_PROCESSOR_ARG "grpc.auth_metadata_processor"
+
+grpc_arg grpc_auth_metadata_processor_to_arg(grpc_auth_metadata_processor *p);
+grpc_auth_metadata_processor *grpc_auth_metadata_processor_from_arg(
+    const grpc_arg *arg);
+grpc_auth_metadata_processor *grpc_find_auth_metadata_processor_in_args(
+    const grpc_channel_args *args);
 
 #endif  /* GRPC_INTERNAL_CORE_SECURITY_SECURITY_CONTEXT_H */
 
diff --git a/src/core/security/server_auth_filter.c b/src/core/security/server_auth_filter.c
index 10eef6d237..2fc689caec 100644
--- a/src/core/security/server_auth_filter.c
+++ b/src/core/security/server_auth_filter.c
@@ -31,20 +31,140 @@
  *
  */
 
+#include <string.h>
+
 #include "src/core/security/auth_filters.h"
 #include "src/core/security/security_connector.h"
 #include "src/core/security/security_context.h"
 
+#include <grpc/support/alloc.h>
 #include <grpc/support/log.h>
 
 typedef struct call_data {
-  int unused; /* C89 requires at least one struct element */
+  gpr_uint8 got_client_metadata;
+  grpc_stream_op_buffer *recv_ops;
+  /* Closure to call when finished with the auth_on_recv hook. */
+  grpc_iomgr_closure *on_done_recv;
+  /* Receive closures are chained: we inject this closure as the on_done_recv
+     up-call on transport_op, and remember to call our on_done_recv member after
+     handling it. */
+  grpc_iomgr_closure auth_on_recv;
+  grpc_transport_stream_op transport_op;
+  const grpc_metadata *consumed_md;
+  size_t num_consumed_md;
+  grpc_stream_op *md_op;
+  grpc_auth_context *auth_context;
 } call_data;
 
 typedef struct channel_data {
   grpc_security_connector *security_connector;
+  grpc_auth_metadata_processor processor;
+  grpc_mdctx *mdctx;
 } channel_data;
 
+static grpc_metadata_array metadata_batch_to_md_array(
+    const grpc_metadata_batch *batch) {
+  grpc_linked_mdelem *l;
+  grpc_metadata_array result;
+  grpc_metadata_array_init(&result);
+  for (l = batch->list.head; l != NULL; l = l->next) {
+    grpc_metadata *usr_md = NULL;
+    grpc_mdelem *md = l->md;
+    grpc_mdstr *key = md->key;
+    grpc_mdstr *value = md->value;
+    if (result.count == result.capacity) {
+      result.capacity = GPR_MAX(result.capacity + 8, result.capacity * 2);
+      result.metadata =
+          gpr_realloc(result.metadata, result.capacity * sizeof(grpc_metadata));
+    }
+    usr_md = &result.metadata[result.count++];
+    usr_md->key = grpc_mdstr_as_c_string(key);
+    usr_md->value = grpc_mdstr_as_c_string(value);
+    usr_md->value_length = GPR_SLICE_LENGTH(value->slice);
+  }
+  return result;
+}
+
+static grpc_mdelem *remove_consumed_md(void *user_data, grpc_mdelem *md) {
+  grpc_call_element *elem = user_data;
+  call_data *calld = elem->call_data;
+  size_t i;
+  for (i = 0; i < calld->num_consumed_md; i++) {
+    /* Maybe we could do a pointer comparison but we do not have any guarantee
+       that the metadata processor used the same pointers for consumed_md in the
+       callback. */
+    if (memcmp(GPR_SLICE_START_PTR(md->key->slice), calld->consumed_md[i].key,
+               GPR_SLICE_LENGTH(md->key->slice)) == 0 &&
+        memcmp(GPR_SLICE_START_PTR(md->value->slice),
+               calld->consumed_md[i].value,
+               GPR_SLICE_LENGTH(md->value->slice)) == 0) {
+      return NULL; /* Delete. */
+    }
+  }
+  return md;
+}
+
+static void on_md_processing_done(void *user_data,
+                                  const grpc_metadata *consumed_md,
+                                  size_t num_consumed_md, int success) {
+  grpc_call_element *elem = user_data;
+  call_data *calld = elem->call_data;
+
+  if (success) {
+    calld->consumed_md = consumed_md;
+    calld->num_consumed_md = num_consumed_md;
+    grpc_metadata_batch_filter(&calld->md_op->data.metadata, remove_consumed_md,
+                               elem);
+    calld->on_done_recv->cb(calld->on_done_recv->cb_arg, success);
+  } else {
+    gpr_slice message = gpr_slice_from_copied_string(
+        "Authentication metadata processing failed.");
+    grpc_sopb_reset(calld->recv_ops);
+    grpc_transport_stream_op_add_close(&calld->transport_op,
+                                       GRPC_STATUS_UNAUTHENTICATED, &message);
+    grpc_call_next_op(elem, &calld->transport_op);
+  }
+}
+
+static void auth_on_recv(void *user_data, int success) {
+  grpc_call_element *elem = user_data;
+  call_data *calld = elem->call_data;
+  channel_data *chand = elem->channel_data;
+  if (success) {
+    size_t i;
+    size_t nops = calld->recv_ops->nops;
+    grpc_stream_op *ops = calld->recv_ops->ops;
+    for (i = 0; i < nops; i++) {
+      grpc_metadata_array md_array;
+      grpc_stream_op *op = &ops[i];
+      if (op->type != GRPC_OP_METADATA || calld->got_client_metadata) continue;
+      calld->got_client_metadata = 1;
+      if (chand->processor.process == NULL) continue;
+      calld->md_op = op;
+      md_array = metadata_batch_to_md_array(&op->data.metadata);
+      chand->processor.process(chand->processor.state, calld->auth_context,
+                               md_array.metadata, md_array.count,
+                               on_md_processing_done, elem);
+      grpc_metadata_array_destroy(&md_array);
+      return;
+    }
+  }
+  calld->on_done_recv->cb(calld->on_done_recv->cb_arg, success);
+}
+
+static void set_recv_ops_md_callbacks(grpc_call_element *elem,
+                                      grpc_transport_stream_op *op) {
+  call_data *calld = elem->call_data;
+
+  if (op->recv_ops && !calld->got_client_metadata) {
+    /* substitute our callback for the higher callback */
+    calld->recv_ops = op->recv_ops;
+    calld->on_done_recv = op->on_done_recv;
+    op->on_done_recv = &calld->auth_on_recv;
+    calld->transport_op = *op;
+  }
+}
+
 /* Called either:
      - in response to an API call (or similar) from above, to send something
      - a network event (or similar) from below, to receive something
@@ -52,9 +172,7 @@ typedef struct channel_data {
    that is being sent or received. */
 static void auth_start_transport_op(grpc_call_element *elem,
                                     grpc_transport_stream_op *op) {
-  /* TODO(jboeuf): Get the metadata and get a new context from it. */
-
-  /* pass control down the stack */
+  set_recv_ops_md_callbacks(elem, op);
   grpc_call_next_op(elem, op);
 }
 
@@ -68,7 +186,8 @@ static void init_call_elem(grpc_call_element *elem,
   grpc_server_security_context *server_ctx = NULL;
 
   /* initialize members */
-  calld->unused = 0;
+  memset(calld, 0, sizeof(*calld));
+  grpc_iomgr_closure_init(&calld->auth_on_recv, auth_on_recv, elem);
 
   GPR_ASSERT(initial_op && initial_op->context != NULL &&
              initial_op->context[GRPC_CONTEXT_SECURITY].value == NULL);
@@ -80,21 +199,29 @@ static void init_call_elem(grpc_call_element *elem,
         initial_op->context[GRPC_CONTEXT_SECURITY].value);
   }
   server_ctx = grpc_server_security_context_create();
-  server_ctx->auth_context = GRPC_AUTH_CONTEXT_REF(
-      chand->security_connector->auth_context, "server_security_context");
+  server_ctx->auth_context =
+      grpc_auth_context_create(chand->security_connector->auth_context);
+  server_ctx->auth_context->pollset = initial_op->bind_pollset;
   initial_op->context[GRPC_CONTEXT_SECURITY].value = server_ctx;
   initial_op->context[GRPC_CONTEXT_SECURITY].destroy =
       grpc_server_security_context_destroy;
+  calld->auth_context = server_ctx->auth_context;
+
+  /* Set the metadata callbacks. */
+  set_recv_ops_md_callbacks(elem, initial_op);
 }
 
 /* Destructor for call_data */
-static void destroy_call_elem(grpc_call_element *elem) {}
+static void destroy_call_elem(grpc_call_element *elem) {
+}
 
 /* Constructor for channel_data */
 static void init_channel_elem(grpc_channel_element *elem, grpc_channel *master,
                               const grpc_channel_args *args, grpc_mdctx *mdctx,
                               int is_first, int is_last) {
   grpc_security_connector *sc = grpc_find_security_connector_in_args(args);
+  grpc_auth_metadata_processor *processor =
+      grpc_find_auth_metadata_processor_in_args(args);
   /* grab pointers to our data from the channel element */
   channel_data *chand = elem->channel_data;
 
@@ -104,11 +231,14 @@ static void init_channel_elem(grpc_channel_element *elem, grpc_channel *master,
   GPR_ASSERT(!is_first);
   GPR_ASSERT(!is_last);
   GPR_ASSERT(sc != NULL);
+  GPR_ASSERT(processor != NULL);
 
   /* initialize members */
   GPR_ASSERT(!sc->is_client_side);
   chand->security_connector =
       GRPC_SECURITY_CONNECTOR_REF(sc, "server_auth_filter");
+  chand->mdctx = mdctx;
+  chand->processor = *processor;
 }
 
 /* Destructor for channel data */
@@ -120,6 +250,8 @@ static void destroy_channel_elem(grpc_channel_element *elem) {
 }
 
 const grpc_channel_filter grpc_server_auth_filter = {
-    auth_start_transport_op, grpc_channel_next_op, sizeof(call_data),
-    init_call_elem,          destroy_call_elem,    sizeof(channel_data),
-    init_channel_elem,       destroy_channel_elem, "server-auth"};
+    auth_start_transport_op, grpc_channel_next_op,
+    sizeof(call_data),       init_call_elem,
+    destroy_call_elem,       sizeof(channel_data),
+    init_channel_elem,       destroy_channel_elem,
+    grpc_call_next_get_peer, "server-auth"};
diff --git a/src/core/security/server_secure_chttp2.c b/src/core/security/server_secure_chttp2.c
index 3717b8989f..8d9d036d80 100644
--- a/src/core/security/server_secure_chttp2.c
+++ b/src/core/security/server_secure_chttp2.c
@@ -43,6 +43,7 @@
 #include "src/core/security/auth_filters.h"
 #include "src/core/security/credentials.h"
 #include "src/core/security/security_connector.h"
+#include "src/core/security/security_context.h"
 #include "src/core/security/secure_transport_setup.h"
 #include "src/core/surface/server.h"
 #include "src/core/transport/chttp2_transport.h"
@@ -60,6 +61,7 @@ typedef struct grpc_server_secure_state {
   grpc_server *server;
   grpc_tcp_server *tcp;
   grpc_security_connector *sc;
+  grpc_auth_metadata_processor processor;
   tcp_endpoint_list *handshaking_tcp_endpoints;
   int is_shutdown;
   gpr_mu mu;
@@ -86,9 +88,13 @@ static void setup_transport(void *statep, grpc_transport *transport,
   static grpc_channel_filter const *extra_filters[] = {
       &grpc_server_auth_filter, &grpc_http_server_filter};
   grpc_server_secure_state *state = statep;
-  grpc_arg connector_arg = grpc_security_connector_to_arg(state->sc);
-  grpc_channel_args *args_copy = grpc_channel_args_copy_and_add(
-      grpc_server_get_channel_args(state->server), &connector_arg, 1);
+  grpc_channel_args *args_copy;
+  grpc_arg args_to_add[2];
+  args_to_add[0] = grpc_security_connector_to_arg(state->sc);
+  args_to_add[1] = grpc_auth_metadata_processor_to_arg(&state->processor);
+  args_copy = grpc_channel_args_copy_and_add(
+      grpc_server_get_channel_args(state->server), args_to_add,
+      GPR_ARRAY_SIZE(args_to_add));
   grpc_server_setup_transport(state->server, transport, extra_filters,
                               GPR_ARRAY_SIZE(extra_filters), mdctx, args_copy);
   grpc_channel_args_destroy(args_copy);
@@ -252,9 +258,11 @@ int grpc_server_add_secure_http2_port(grpc_server *server, const char *addr,
   grpc_resolved_addresses_destroy(resolved);
 
   state = gpr_malloc(sizeof(*state));
+  memset(state, 0, sizeof(*state));
   state->server = server;
   state->tcp = tcp;
   state->sc = sc;
+  state->processor = creds->processor;
   state->handshaking_tcp_endpoints = NULL;
   state->is_shutdown = 0;
   gpr_mu_init(&state->mu);
diff --git a/src/core/support/host_port.c b/src/core/support/host_port.c
index 0906ebc2a3..a28f04df9c 100644
--- a/src/core/support/host_port.c
+++ b/src/core/support/host_port.c
@@ -50,7 +50,7 @@ int gpr_join_host_port(char **out, const char *host, int port) {
   }
 }
 
-void gpr_split_host_port(const char *name, char **host, char **port) {
+int gpr_split_host_port(const char *name, char **host, char **port) {
   const char *host_start;
   size_t host_len;
   const char *port_start;
@@ -63,7 +63,7 @@ void gpr_split_host_port(const char *name, char **host, char **port) {
     const char *rbracket = strchr(name, ']');
     if (rbracket == NULL) {
       /* Unmatched [ */
-      return;
+      return 0;
     }
     if (rbracket[1] == '\0') {
       /* ]<end> */
@@ -73,14 +73,14 @@ void gpr_split_host_port(const char *name, char **host, char **port) {
       port_start = rbracket + 2;
     } else {
       /* ]<invalid> */
-      return;
+      return 0;
     }
     host_start = name + 1;
     host_len = (size_t)(rbracket - host_start);
     if (memchr(host_start, ':', host_len) == NULL) {
       /* Require all bracketed hosts to contain a colon, because a hostname or
       IPv4 address should never use brackets. */
-      return;
+      return 0;
     }
   } else {
     const char *colon = strchr(name, ':');
@@ -105,4 +105,6 @@ void gpr_split_host_port(const char *name, char **host, char **port) {
   if (port_start != NULL) {
     *port = gpr_strdup(port_start);
   }
+
+  return 1;
 }
diff --git a/src/core/support/stack_lockfree.c b/src/core/support/stack_lockfree.c
index 2844330379..bc741f8c70 100644
--- a/src/core/support/stack_lockfree.c
+++ b/src/core/support/stack_lockfree.c
@@ -72,6 +72,11 @@ typedef union lockfree_node {
 struct gpr_stack_lockfree {
   lockfree_node *entries;
   lockfree_node head; /* An atomic entry describing curr head */
+
+#ifndef NDEBUG
+  /* Bitmap of pushed entries to check for double-push or pop */
+  gpr_atm pushed[(INVALID_ENTRY_INDEX+1)/(8*sizeof(gpr_atm))];
+#endif
 };
 
 gpr_stack_lockfree *gpr_stack_lockfree_create(int entries) {
@@ -86,6 +91,11 @@ gpr_stack_lockfree *gpr_stack_lockfree_create(int entries) {
   /* Clear out all entries */
   memset(stack->entries, 0, entries * sizeof(stack->entries[0]));
   memset(&stack->head, 0, sizeof(stack->head));
+#ifndef NDEBUG
+  memset(&stack->pushed, 0, sizeof(stack->pushed));
+#endif
+
+  GPR_ASSERT(sizeof(stack->entries->atm) == sizeof(stack->entries->contents));
 
   /* Point the head at reserved dummy entry */
   stack->head.contents.index = INVALID_ENTRY_INDEX;
@@ -100,17 +110,36 @@ void gpr_stack_lockfree_destroy(gpr_stack_lockfree *stack) {
 int gpr_stack_lockfree_push(gpr_stack_lockfree *stack, int entry) {
   lockfree_node head;
   lockfree_node newhead;
+  lockfree_node curent;
+  lockfree_node newent;
 
   /* First fill in the entry's index and aba ctr for new head */
   newhead.contents.index = (gpr_uint16)entry;
   /* Also post-increment the aba_ctr */
-  newhead.contents.aba_ctr = stack->entries[entry].contents.aba_ctr++;
+  curent.atm = gpr_atm_no_barrier_load(&stack->entries[entry].atm);
+  newhead.contents.aba_ctr = ++curent.contents.aba_ctr;
+  gpr_atm_no_barrier_store(&stack->entries[entry].atm, curent.atm);
+
+#ifndef NDEBUG
+  /* Check for double push */
+  {
+    int pushed_index = entry / (8*sizeof(gpr_atm));
+    int pushed_bit = entry % (8*sizeof(gpr_atm));
+    gpr_atm old_val;
+
+    old_val = gpr_atm_no_barrier_fetch_add(&stack->pushed[pushed_index],
+					   (gpr_atm)(1UL << pushed_bit));
+    GPR_ASSERT((old_val & (1UL<<pushed_bit)) == 0);
+  }
+#endif
 
   do {
     /* Atomically get the existing head value for use */
     head.atm = gpr_atm_no_barrier_load(&(stack->head.atm));
     /* Point to it */
-    stack->entries[entry].contents.index = head.contents.index;
+    newent.atm = gpr_atm_no_barrier_load(&stack->entries[entry].atm);
+    newent.contents.index = head.contents.index;
+    gpr_atm_no_barrier_store(&stack->entries[entry].atm, newent.atm);
   } while (!gpr_atm_rel_cas(&(stack->head.atm), head.atm, newhead.atm));
   /* Use rel_cas above to make sure that entry index is set properly */
   return head.contents.index == INVALID_ENTRY_INDEX;
@@ -119,6 +148,7 @@ int gpr_stack_lockfree_push(gpr_stack_lockfree *stack, int entry) {
 int gpr_stack_lockfree_pop(gpr_stack_lockfree *stack) {
   lockfree_node head;
   lockfree_node newhead;
+
   do {
     head.atm = gpr_atm_acq_load(&(stack->head.atm));
     if (head.contents.index == INVALID_ENTRY_INDEX) {
@@ -128,5 +158,18 @@ int gpr_stack_lockfree_pop(gpr_stack_lockfree *stack) {
         gpr_atm_no_barrier_load(&(stack->entries[head.contents.index].atm));
 
   } while (!gpr_atm_no_barrier_cas(&(stack->head.atm), head.atm, newhead.atm));
+#ifndef NDEBUG
+  /* Check for valid pop */
+  {
+    int pushed_index = head.contents.index / (8*sizeof(gpr_atm));
+    int pushed_bit = head.contents.index % (8*sizeof(gpr_atm));
+    gpr_atm old_val;
+
+    old_val = gpr_atm_no_barrier_fetch_add(&stack->pushed[pushed_index],
+					   -(gpr_atm)(1UL << pushed_bit));
+    GPR_ASSERT((old_val & (1UL<<pushed_bit)) != 0);
+  }
+#endif
+
   return head.contents.index;
 }
diff --git a/src/core/surface/call.c b/src/core/surface/call.c
index 0e97110e5e..a7624fd96f 100644
--- a/src/core/surface/call.c
+++ b/src/core/surface/call.c
@@ -41,7 +41,6 @@
 #include <grpc/support/string_util.h>
 #include <grpc/support/useful.h>
 
-#include "src/core/census/grpc_context.h"
 #include "src/core/channel/channel_stack.h"
 #include "src/core/iomgr/alarm.h"
 #include "src/core/profiling/timers.h"
@@ -145,6 +144,8 @@ typedef enum {
 struct grpc_call {
   grpc_completion_queue *cq;
   grpc_channel *channel;
+  grpc_call *parent;
+  grpc_call *first_child;
   grpc_mdctx *metadata_context;
   /* TODO(ctiller): share with cq if possible? */
   gpr_mu mu;
@@ -178,6 +179,8 @@ struct grpc_call {
   gpr_uint8 cancel_alarm;
   /** bitmask of allocated completion events in completions */
   gpr_uint8 allocated_completions;
+  /** flag indicating that cancellation is inherited */
+  gpr_uint8 cancellation_is_inherited;
 
   /* flags with bits corresponding to write states allowing us to determine
      what was sent */
@@ -272,6 +275,11 @@ struct grpc_call {
 
   /** completion events - for completion queue use */
   grpc_cq_completion completions[MAX_CONCURRENT_COMPLETIONS];
+
+  /** siblings: children of the same parent form a list, and this list is protected under
+      parent->mu */
+  grpc_call *sibling_next;
+  grpc_call *sibling_prev;
 };
 
 #define CALL_STACK_FROM_CALL(call) ((grpc_call_stack *)((call) + 1))
@@ -295,7 +303,9 @@ static void finished_loose_op(void *call, int success);
 static void lock(grpc_call *call);
 static void unlock(grpc_call *call);
 
-grpc_call *grpc_call_create(grpc_channel *channel, grpc_completion_queue *cq,
+grpc_call *grpc_call_create(grpc_channel *channel, grpc_call *parent_call,
+                            gpr_uint32 propagation_mask,
+                            grpc_completion_queue *cq,
                             const void *server_transport_data,
                             grpc_mdelem **add_initial_metadata,
                             size_t add_initial_metadata_count,
@@ -311,9 +321,10 @@ grpc_call *grpc_call_create(grpc_channel *channel, grpc_completion_queue *cq,
   gpr_mu_init(&call->completion_mu);
   call->channel = channel;
   call->cq = cq;
-  if (cq) {
+  if (cq != NULL) {
     GRPC_CQ_INTERNAL_REF(cq, "bind");
   }
+  call->parent = parent_call;
   call->is_client = server_transport_data == NULL;
   for (i = 0; i < GRPC_IOREQ_OP_COUNT; i++) {
     call->request_set[i] = REQSET_EMPTY;
@@ -352,7 +363,48 @@ grpc_call *grpc_call_create(grpc_channel *channel, grpc_completion_queue *cq,
   }
   grpc_call_stack_init(channel_stack, server_transport_data, initial_op_ptr,
                        CALL_STACK_FROM_CALL(call));
-  if (gpr_time_cmp(send_deadline, gpr_inf_future(send_deadline.clock_type)) != 0) {
+  if (parent_call != NULL) {
+    GRPC_CALL_INTERNAL_REF(parent_call, "child");
+    GPR_ASSERT(call->is_client);
+    GPR_ASSERT(!parent_call->is_client);
+
+    gpr_mu_lock(&parent_call->mu);
+
+    if (propagation_mask & GRPC_PROPAGATE_DEADLINE) {
+      send_deadline = gpr_time_min(
+          gpr_convert_clock_type(send_deadline,
+                                 parent_call->send_deadline.clock_type),
+          parent_call->send_deadline);
+    }
+    /* for now GRPC_PROPAGATE_TRACING_CONTEXT *MUST* be passed with
+     * GRPC_PROPAGATE_STATS_CONTEXT */
+    /* TODO(ctiller): This should change to use the appropriate census start_op
+     * call. */
+    if (propagation_mask & GRPC_PROPAGATE_CENSUS_TRACING_CONTEXT) {
+      GPR_ASSERT(propagation_mask & GRPC_PROPAGATE_CENSUS_STATS_CONTEXT);
+      grpc_call_context_set(call, GRPC_CONTEXT_TRACING,
+                            parent_call->context[GRPC_CONTEXT_TRACING].value,
+                            NULL);
+    } else {
+      GPR_ASSERT(propagation_mask & GRPC_PROPAGATE_CENSUS_STATS_CONTEXT);
+    }
+    if (propagation_mask & GRPC_PROPAGATE_CANCELLATION) {
+      call->cancellation_is_inherited = 1;
+    }
+
+    if (parent_call->first_child == NULL) {
+      parent_call->first_child = call;
+      call->sibling_next = call->sibling_prev = call;
+    } else {
+      call->sibling_next = parent_call->first_child;
+      call->sibling_prev = parent_call->first_child->sibling_prev;
+      call->sibling_next->sibling_prev = call->sibling_prev->sibling_next = call;
+    }
+
+    gpr_mu_unlock(&parent_call->mu);
+  }
+  if (gpr_time_cmp(send_deadline, gpr_inf_future(send_deadline.clock_type)) !=
+      0) {
     set_deadline_alarm(call, send_deadline);
   }
   return call;
@@ -911,6 +963,8 @@ static int add_slice_to_message(grpc_call *call, gpr_slice slice) {
 
 static void call_on_done_recv(void *pc, int success) {
   grpc_call *call = pc;
+  grpc_call *child_call;
+  grpc_call *next_child_call;
   size_t i;
   GRPC_TIMER_BEGIN(GRPC_PTAG_CALL_ON_DONE_RECV, 0);
   lock(call);
@@ -944,6 +998,19 @@ static void call_on_done_recv(void *pc, int success) {
       GPR_ASSERT(call->read_state <= READ_STATE_STREAM_CLOSED);
       call->read_state = READ_STATE_STREAM_CLOSED;
       call->cancel_alarm |= call->have_alarm;
+      /* propagate cancellation to any interested children */
+      child_call = call->first_child;
+      if (child_call != NULL) {
+        do {
+          next_child_call = child_call->sibling_next;
+          if (child_call->cancellation_is_inherited) {
+            GRPC_CALL_INTERNAL_REF(child_call, "propagate_cancel");
+            grpc_call_cancel(child_call);
+            GRPC_CALL_INTERNAL_UNREF(child_call, "propagate_cancel", 0);
+          }
+          child_call = next_child_call;
+        } while (child_call != call->first_child);
+      }
       GRPC_CALL_INTERNAL_UNREF(call, "closed", 0);
     }
     finish_read_ops(call);
@@ -973,7 +1040,7 @@ static int prepare_application_metadata(grpc_call *call, size_t count,
     GPR_ASSERT(sizeof(grpc_linked_mdelem) == sizeof(md->internal_data));
     l->md = grpc_mdelem_from_string_and_buffer(call->metadata_context, md->key,
                                                (const gpr_uint8 *)md->value,
-                                               md->value_length);
+                                               md->value_length, 1);
     if (!grpc_mdstr_is_legal_header(l->md->key)) {
       gpr_log(GPR_ERROR, "attempt to send invalid metadata key");
       return 0;
@@ -1217,6 +1284,22 @@ grpc_call_error grpc_call_start_ioreq_and_call_back(
 
 void grpc_call_destroy(grpc_call *c) {
   int cancel;
+  grpc_call *parent = c->parent;
+
+  if (parent) {
+    gpr_mu_lock(&parent->mu);
+    if (c == parent->first_child) {
+      parent->first_child = c->sibling_next;
+      if (c == parent->first_child) {
+        parent->first_child = NULL;
+      }
+      c->sibling_prev->sibling_next = c->sibling_next;
+      c->sibling_next->sibling_prev = c->sibling_prev;
+    }
+    gpr_mu_unlock(&parent->mu);
+    GRPC_CALL_INTERNAL_UNREF(parent, "child", 1);
+  }
+
   lock(c);
   GPR_ASSERT(!c->destroy_called);
   c->destroy_called = 1;
@@ -1244,7 +1327,7 @@ grpc_call_error grpc_call_cancel_with_status(grpc_call *c,
 static grpc_call_error cancel_with_status(grpc_call *c, grpc_status_code status,
                                           const char *description) {
   grpc_mdstr *details =
-      description ? grpc_mdstr_from_string(c->metadata_context, description)
+      description ? grpc_mdstr_from_string(c->metadata_context, description, 0)
                   : NULL;
 
   GPR_ASSERT(status != GRPC_STATUS_OK);
@@ -1294,6 +1377,11 @@ static void execute_op(grpc_call *call, grpc_transport_stream_op *op) {
   elem->filter->start_transport_stream_op(elem, op);
 }
 
+char *grpc_call_get_peer(grpc_call *call) {
+  grpc_call_element *elem = CALL_ELEM_FROM_CALL(call, 0);
+  return elem->filter->get_peer(elem);
+}
+
 grpc_call *grpc_call_from_top_element(grpc_call_element *elem) {
   return CALL_FROM_TOP_ELEM(elem);
 }
@@ -1319,7 +1407,8 @@ static void set_deadline_alarm(grpc_call *call, gpr_timespec deadline) {
   }
   GRPC_CALL_INTERNAL_REF(call, "alarm");
   call->have_alarm = 1;
-  grpc_alarm_init(&call->alarm, gpr_convert_clock_type(deadline, GPR_CLOCK_MONOTONIC), call_alarm, call,
+  call->send_deadline = gpr_convert_clock_type(deadline, GPR_CLOCK_MONOTONIC);
+  grpc_alarm_init(&call->alarm, call->send_deadline, call_alarm, call,
                   gpr_now(GPR_CLOCK_MONOTONIC));
 }
 
@@ -1364,8 +1453,9 @@ static gpr_uint32 decode_compression(grpc_mdelem *md) {
       gpr_log(GPR_ERROR, "Invalid compression algorithm: '%s'", md_c_str);
       assert(0);
     }
-    grpc_mdelem_set_user_data(md, destroy_compression,
-                              (void *)(gpr_intptr)(algorithm + COMPRESS_OFFSET));
+    grpc_mdelem_set_user_data(
+        md, destroy_compression,
+        (void *)(gpr_intptr)(algorithm + COMPRESS_OFFSET));
   }
   return algorithm;
 }
@@ -1414,7 +1504,9 @@ static void recv_metadata(grpc_call *call, grpc_metadata_batch *md) {
       l->md = 0;
     }
   }
-  if (gpr_time_cmp(md->deadline, gpr_inf_future(GPR_CLOCK_REALTIME)) != 0) {
+  if (gpr_time_cmp(md->deadline, gpr_inf_future(md->deadline.clock_type)) !=
+          0 &&
+      !call->is_client) {
     set_deadline_alarm(call, md->deadline);
   }
   if (!is_trailing) {
@@ -1502,6 +1594,9 @@ grpc_call_error grpc_call_start_batch(grpc_call *call, const grpc_op *ops,
         if (!are_write_flags_valid(op->flags)) {
           return GRPC_CALL_ERROR_INVALID_FLAGS;
         }
+        if (op->data.send_message == NULL) {
+          return GRPC_CALL_ERROR_INVALID_MESSAGE;
+        }
         req = &reqs[out++];
         req->op = GRPC_IOREQ_SEND_MESSAGE;
         req->data.send_message = op->data.send_message;
@@ -1537,7 +1632,7 @@ grpc_call_error grpc_call_start_batch(grpc_call *call, const grpc_op *ops,
             op->data.send_status_from_server.status_details != NULL
                 ? grpc_mdstr_from_string(
                       call->metadata_context,
-                      op->data.send_status_from_server.status_details)
+                      op->data.send_status_from_server.status_details, 0)
                 : NULL;
         req = &reqs[out++];
         req->op = GRPC_IOREQ_SEND_CLOSE;
@@ -1551,6 +1646,7 @@ grpc_call_error grpc_call_start_batch(grpc_call *call, const grpc_op *ops,
         req = &reqs[out++];
         req->op = GRPC_IOREQ_RECV_INITIAL_METADATA;
         req->data.recv_metadata = op->data.recv_initial_metadata;
+        req->data.recv_metadata->count = 0;
         req->flags = op->flags;
         break;
       case GRPC_OP_RECV_MESSAGE:
@@ -1582,6 +1678,7 @@ grpc_call_error grpc_call_start_batch(grpc_call *call, const grpc_op *ops,
         req->op = GRPC_IOREQ_RECV_TRAILING_METADATA;
         req->data.recv_metadata =
             op->data.recv_status_on_client.trailing_metadata;
+        req->data.recv_metadata->count = 0;
         req = &reqs[out++];
         req->op = GRPC_IOREQ_RECV_CLOSE;
         finish_func = finish_batch_with_close;
diff --git a/src/core/surface/call.h b/src/core/surface/call.h
index 5641561f85..00638e43b5 100644
--- a/src/core/surface/call.h
+++ b/src/core/surface/call.h
@@ -89,7 +89,9 @@ typedef struct {
 typedef void (*grpc_ioreq_completion_func)(grpc_call *call, int success,
                                            void *user_data);
 
-grpc_call *grpc_call_create(grpc_channel *channel, grpc_completion_queue *cq,
+grpc_call *grpc_call_create(grpc_channel *channel, grpc_call *parent_call,
+                            gpr_uint32 propagation_mask,
+                            grpc_completion_queue *cq,
                             const void *server_transport_data,
                             grpc_mdelem **add_initial_metadata,
                             size_t add_initial_metadata_count,
diff --git a/src/core/surface/channel.c b/src/core/surface/channel.c
index cd71e03b19..b80398858d 100644
--- a/src/core/surface/channel.c
+++ b/src/core/surface/channel.c
@@ -36,12 +36,14 @@
 #include <stdlib.h>
 #include <string.h>
 
+#include <grpc/support/alloc.h>
+#include <grpc/support/log.h>
+#include <grpc/support/string_util.h>
+
 #include "src/core/iomgr/iomgr.h"
 #include "src/core/support/string.h"
 #include "src/core/surface/call.h"
 #include "src/core/surface/init.h"
-#include <grpc/support/alloc.h>
-#include <grpc/support/log.h>
 
 /** Cache grpc-status: X mdelems for X = 0..NUM_CACHED_STATUS_ELEMS.
  *  Avoids needing to take a metadata context lock for sending status
@@ -74,6 +76,7 @@ struct grpc_channel {
   gpr_mu registered_call_mu;
   registered_call *registered_calls;
   grpc_iomgr_closure destroy_closure;
+  char *target;
 };
 
 #define CHANNEL_STACK_FROM_CHANNEL(c) ((grpc_channel_stack *)((c) + 1))
@@ -86,33 +89,35 @@ struct grpc_channel {
 #define DEFAULT_MAX_MESSAGE_LENGTH (100 * 1024 * 1024)
 
 grpc_channel *grpc_channel_create_from_filters(
-    const grpc_channel_filter **filters, size_t num_filters,
+    const char *target, const grpc_channel_filter **filters, size_t num_filters,
     const grpc_channel_args *args, grpc_mdctx *mdctx, int is_client) {
   size_t i;
   size_t size =
       sizeof(grpc_channel) + grpc_channel_stack_size(filters, num_filters);
   grpc_channel *channel = gpr_malloc(size);
   memset(channel, 0, sizeof(*channel));
+  channel->target = gpr_strdup(target);
   GPR_ASSERT(grpc_is_initialized() && "call grpc_init()");
   channel->is_client = is_client;
   /* decremented by grpc_channel_destroy */
   gpr_ref_init(&channel->refs, 1);
   channel->metadata_context = mdctx;
-  channel->grpc_status_string = grpc_mdstr_from_string(mdctx, "grpc-status");
+  channel->grpc_status_string = grpc_mdstr_from_string(mdctx, "grpc-status", 0);
   channel->grpc_compression_algorithm_string =
-      grpc_mdstr_from_string(mdctx, "grpc-encoding");
+      grpc_mdstr_from_string(mdctx, "grpc-encoding", 0);
   channel->grpc_encodings_accepted_by_peer_string =
-      grpc_mdstr_from_string(mdctx, "grpc-accept-encoding");
-  channel->grpc_message_string = grpc_mdstr_from_string(mdctx, "grpc-message");
+      grpc_mdstr_from_string(mdctx, "grpc-accept-encoding", 0);
+  channel->grpc_message_string =
+      grpc_mdstr_from_string(mdctx, "grpc-message", 0);
   for (i = 0; i < NUM_CACHED_STATUS_ELEMS; i++) {
     char buf[GPR_LTOA_MIN_BUFSIZE];
     gpr_ltoa(i, buf);
     channel->grpc_status_elem[i] = grpc_mdelem_from_metadata_strings(
         mdctx, GRPC_MDSTR_REF(channel->grpc_status_string),
-        grpc_mdstr_from_string(mdctx, buf));
+        grpc_mdstr_from_string(mdctx, buf, 0));
   }
-  channel->path_string = grpc_mdstr_from_string(mdctx, ":path");
-  channel->authority_string = grpc_mdstr_from_string(mdctx, ":authority");
+  channel->path_string = grpc_mdstr_from_string(mdctx, ":path", 0);
+  channel->authority_string = grpc_mdstr_from_string(mdctx, ":authority", 0);
   gpr_mu_init(&channel->registered_call_mu);
   channel->registered_calls = NULL;
 
@@ -140,32 +145,43 @@ grpc_channel *grpc_channel_create_from_filters(
   return channel;
 }
 
+char *grpc_channel_get_target(grpc_channel *channel) {
+  return gpr_strdup(channel->target);
+}
+
 static grpc_call *grpc_channel_create_call_internal(
-    grpc_channel *channel, grpc_completion_queue *cq, grpc_mdelem *path_mdelem,
+    grpc_channel *channel, grpc_call *parent_call, gpr_uint32 propagation_mask,
+    grpc_completion_queue *cq, grpc_mdelem *path_mdelem,
     grpc_mdelem *authority_mdelem, gpr_timespec deadline) {
   grpc_mdelem *send_metadata[2];
+  int num_metadata = 0;
 
   GPR_ASSERT(channel->is_client);
 
-  send_metadata[0] = path_mdelem;
-  send_metadata[1] = authority_mdelem;
+  send_metadata[num_metadata++] = path_mdelem;
+  if (authority_mdelem != NULL) {
+    send_metadata[num_metadata++] = authority_mdelem;
+  }
 
-  return grpc_call_create(channel, cq, NULL, send_metadata,
-                          GPR_ARRAY_SIZE(send_metadata), deadline);
+  return grpc_call_create(channel, parent_call, propagation_mask, cq, NULL, 
+                          send_metadata, num_metadata, deadline);
 }
 
 grpc_call *grpc_channel_create_call(grpc_channel *channel,
+                                    grpc_call *parent_call,
+                                    gpr_uint32 propagation_mask,
                                     grpc_completion_queue *cq,
                                     const char *method, const char *host,
                                     gpr_timespec deadline) {
   return grpc_channel_create_call_internal(
-      channel, cq,
+      channel, parent_call, propagation_mask, cq,
       grpc_mdelem_from_metadata_strings(
           channel->metadata_context, GRPC_MDSTR_REF(channel->path_string),
-          grpc_mdstr_from_string(channel->metadata_context, method)),
+          grpc_mdstr_from_string(channel->metadata_context, method, 0)),
+      host ?
       grpc_mdelem_from_metadata_strings(
           channel->metadata_context, GRPC_MDSTR_REF(channel->authority_string),
-          grpc_mdstr_from_string(channel->metadata_context, host)),
+          grpc_mdstr_from_string(channel->metadata_context, host, 0)) : NULL,
       deadline);
 }
 
@@ -174,10 +190,10 @@ void *grpc_channel_register_call(grpc_channel *channel, const char *method,
   registered_call *rc = gpr_malloc(sizeof(registered_call));
   rc->path = grpc_mdelem_from_metadata_strings(
       channel->metadata_context, GRPC_MDSTR_REF(channel->path_string),
-      grpc_mdstr_from_string(channel->metadata_context, method));
-  rc->authority = grpc_mdelem_from_metadata_strings(
+      grpc_mdstr_from_string(channel->metadata_context, method, 0));
+  rc->authority = host ? grpc_mdelem_from_metadata_strings(
       channel->metadata_context, GRPC_MDSTR_REF(channel->authority_string),
-      grpc_mdstr_from_string(channel->metadata_context, host));
+      grpc_mdstr_from_string(channel->metadata_context, host, 0)) : NULL;
   gpr_mu_lock(&channel->registered_call_mu);
   rc->next = channel->registered_calls;
   channel->registered_calls = rc;
@@ -186,12 +202,14 @@ void *grpc_channel_register_call(grpc_channel *channel, const char *method,
 }
 
 grpc_call *grpc_channel_create_registered_call(
-    grpc_channel *channel, grpc_completion_queue *completion_queue,
-    void *registered_call_handle, gpr_timespec deadline) {
+    grpc_channel *channel, grpc_call *parent_call, gpr_uint32 propagation_mask,
+    grpc_completion_queue *completion_queue, void *registered_call_handle,
+    gpr_timespec deadline) {
   registered_call *rc = registered_call_handle;
   return grpc_channel_create_call_internal(
-      channel, completion_queue, GRPC_MDELEM_REF(rc->path),
-      GRPC_MDELEM_REF(rc->authority), deadline);
+      channel, parent_call, propagation_mask, completion_queue, 
+      GRPC_MDELEM_REF(rc->path), 
+      rc->authority ? GRPC_MDELEM_REF(rc->authority) : NULL, deadline);
 }
 
 #ifdef GRPC_CHANNEL_REF_COUNT_DEBUG
@@ -221,11 +239,14 @@ static void destroy_channel(void *p, int ok) {
     registered_call *rc = channel->registered_calls;
     channel->registered_calls = rc->next;
     GRPC_MDELEM_UNREF(rc->path);
-    GRPC_MDELEM_UNREF(rc->authority);
+    if (rc->authority) {
+      GRPC_MDELEM_UNREF(rc->authority);
+    }
     gpr_free(rc);
   }
   grpc_mdctx_unref(channel->metadata_context);
   gpr_mu_destroy(&channel->registered_call_mu);
+  gpr_free(channel->target);
   gpr_free(channel);
 }
 
@@ -284,7 +305,7 @@ grpc_mdelem *grpc_channel_get_reffed_status_elem(grpc_channel *channel, int i) {
     gpr_ltoa(i, tmp);
     return grpc_mdelem_from_metadata_strings(
         channel->metadata_context, GRPC_MDSTR_REF(channel->grpc_status_string),
-        grpc_mdstr_from_string(channel->metadata_context, tmp));
+        grpc_mdstr_from_string(channel->metadata_context, tmp, 0));
   }
 }
 
diff --git a/src/core/surface/channel.h b/src/core/surface/channel.h
index 1d1550bbe7..f271616f60 100644
--- a/src/core/surface/channel.h
+++ b/src/core/surface/channel.h
@@ -38,7 +38,7 @@
 #include "src/core/client_config/subchannel_factory.h"
 
 grpc_channel *grpc_channel_create_from_filters(
-    const grpc_channel_filter **filters, size_t count,
+    const char *target, const grpc_channel_filter **filters, size_t count,
     const grpc_channel_args *args, grpc_mdctx *mdctx, int is_client);
 
 /** Get a (borrowed) pointer to this channels underlying channel stack */
diff --git a/src/core/surface/channel_connectivity.c b/src/core/surface/channel_connectivity.c
new file mode 100644
index 0000000000..1223706457
--- /dev/null
+++ b/src/core/surface/channel_connectivity.c
@@ -0,0 +1,185 @@
+/*
+ *
+ * Copyright 2015, Google Inc.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *
+ *     * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above
+ * copyright notice, this list of conditions and the following disclaimer
+ * in the documentation and/or other materials provided with the
+ * distribution.
+ *     * Neither the name of Google Inc. nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ */
+
+#include "src/core/surface/channel.h"
+
+#include <grpc/support/alloc.h>
+#include <grpc/support/log.h>
+
+#include "src/core/channel/client_channel.h"
+#include "src/core/iomgr/alarm.h"
+#include "src/core/surface/completion_queue.h"
+
+grpc_connectivity_state grpc_channel_check_connectivity_state(
+    grpc_channel *channel, int try_to_connect) {
+  /* forward through to the underlying client channel */
+  grpc_channel_element *client_channel_elem =
+      grpc_channel_stack_last_element(grpc_channel_get_channel_stack(channel));
+  if (client_channel_elem->filter != &grpc_client_channel_filter) {
+    gpr_log(GPR_ERROR,
+            "grpc_channel_check_connectivity_state called on something that is "
+            "not a client channel, but '%s'",
+            client_channel_elem->filter->name);
+    return GRPC_CHANNEL_FATAL_FAILURE;
+  }
+  return grpc_client_channel_check_connectivity_state(client_channel_elem,
+                                                      try_to_connect);
+}
+
+typedef enum {
+  WAITING,
+  CALLING_BACK,
+  CALLING_BACK_AND_FINISHED,
+  CALLED_BACK
+} callback_phase;
+
+typedef struct {
+  gpr_mu mu;
+  callback_phase phase;
+  int success;
+  grpc_iomgr_closure on_complete;
+  grpc_alarm alarm;
+  grpc_connectivity_state state;
+  grpc_completion_queue *cq;
+  grpc_cq_completion completion_storage;
+  grpc_channel *channel;
+  void *tag;
+} state_watcher;
+
+static void delete_state_watcher(state_watcher *w) {
+  grpc_channel_element *client_channel_elem =
+      grpc_channel_stack_last_element(grpc_channel_get_channel_stack(w->channel));
+  grpc_client_channel_del_interested_party(client_channel_elem, grpc_cq_pollset(w->cq));
+  GRPC_CHANNEL_INTERNAL_UNREF(w->channel, "watch_connectivity");
+  gpr_mu_destroy(&w->mu);
+  gpr_free(w);
+}
+
+static void finished_completion(void *pw, grpc_cq_completion *ignored) {
+  int delete = 0;
+  state_watcher *w = pw;
+  gpr_mu_lock(&w->mu);
+  switch (w->phase) {
+    case WAITING:
+    case CALLED_BACK:
+      gpr_log(GPR_ERROR, "should never reach here");
+      abort();
+      break;
+    case CALLING_BACK:
+      w->phase = CALLED_BACK;
+      break;
+    case CALLING_BACK_AND_FINISHED:
+      delete = 1;
+      break;
+  }
+  gpr_mu_unlock(&w->mu);
+
+  if (delete) {
+    delete_state_watcher(w);
+  }
+}
+
+static void partly_done(state_watcher *w, int due_to_completion) {
+  int delete = 0;
+
+  if (due_to_completion) {
+    gpr_mu_lock(&w->mu);
+    w->success = 1;
+    gpr_mu_unlock(&w->mu);
+    grpc_alarm_cancel(&w->alarm);
+  }
+
+  gpr_mu_lock(&w->mu);
+  switch (w->phase) {
+    case WAITING:
+      w->phase = CALLING_BACK;
+      grpc_cq_end_op(w->cq, w->tag, w->success, finished_completion, w,
+                     &w->completion_storage);
+      break;
+    case CALLING_BACK:
+      w->phase = CALLING_BACK_AND_FINISHED;
+      break;
+    case CALLING_BACK_AND_FINISHED:
+      gpr_log(GPR_ERROR, "should never reach here");
+      abort();
+      break;
+    case CALLED_BACK:
+      delete = 1;
+      break;
+  }
+  gpr_mu_unlock(&w->mu);
+
+  if (delete) {
+    delete_state_watcher(w);
+  }
+}
+
+static void watch_complete(void *pw, int success) { partly_done(pw, 1); }
+
+static void timeout_complete(void *pw, int success) { partly_done(pw, 0); }
+
+void grpc_channel_watch_connectivity_state(
+    grpc_channel *channel, grpc_connectivity_state last_observed_state,
+    gpr_timespec deadline, grpc_completion_queue *cq, void *tag) {
+  grpc_channel_element *client_channel_elem =
+      grpc_channel_stack_last_element(grpc_channel_get_channel_stack(channel));
+  state_watcher *w = gpr_malloc(sizeof(*w));
+
+  grpc_cq_begin_op(cq);
+
+  gpr_mu_init(&w->mu);
+  grpc_iomgr_closure_init(&w->on_complete, watch_complete, w);
+  w->phase = WAITING;
+  w->state = last_observed_state;
+  w->success = 0;
+  w->cq = cq;
+  w->tag = tag;
+  w->channel = channel;
+
+  grpc_alarm_init(
+      &w->alarm, gpr_convert_clock_type(deadline, GPR_CLOCK_MONOTONIC), 
+      timeout_complete, w, gpr_now(GPR_CLOCK_MONOTONIC));
+
+  if (client_channel_elem->filter != &grpc_client_channel_filter) {
+    gpr_log(GPR_ERROR,
+            "grpc_channel_watch_connectivity_state called on something that is "
+            "not a client channel, but '%s'",
+            client_channel_elem->filter->name);
+    grpc_iomgr_add_delayed_callback(&w->on_complete, 1);
+  } else {
+    GRPC_CHANNEL_INTERNAL_REF(channel, "watch_connectivity");
+    grpc_client_channel_add_interested_party(client_channel_elem, grpc_cq_pollset(cq));
+    grpc_client_channel_watch_connectivity_state(client_channel_elem, &w->state,
+                                                 &w->on_complete);
+  }
+}
diff --git a/src/core/surface/channel_create.c b/src/core/surface/channel_create.c
index 91c7b35550..707d615688 100644
--- a/src/core/surface/channel_create.c
+++ b/src/core/surface/channel_create.c
@@ -109,6 +109,7 @@ typedef struct {
   gpr_refcount refs;
   grpc_mdctx *mdctx;
   grpc_channel_args *merge_args;
+  grpc_channel *master;
 } subchannel_factory;
 
 static void subchannel_factory_ref(grpc_subchannel_factory *scf) {
@@ -119,6 +120,7 @@ static void subchannel_factory_ref(grpc_subchannel_factory *scf) {
 static void subchannel_factory_unref(grpc_subchannel_factory *scf) {
   subchannel_factory *f = (subchannel_factory *)scf;
   if (gpr_unref(&f->refs)) {
+    GRPC_CHANNEL_INTERNAL_UNREF(f->master, "subchannel_factory");
     grpc_channel_args_destroy(f->merge_args);
     grpc_mdctx_unref(f->mdctx);
     gpr_free(f);
@@ -137,6 +139,7 @@ static grpc_subchannel *subchannel_factory_create_subchannel(
   gpr_ref_init(&c->refs, 1);
   args->mdctx = f->mdctx;
   args->args = final_args;
+  args->master = f->master;
   s = grpc_subchannel_create(&c->base, args);
   grpc_connector_unref(&c->base);
   grpc_channel_args_destroy(final_args);
@@ -151,8 +154,8 @@ static const grpc_subchannel_factory_vtable subchannel_factory_vtable = {
    Asynchronously: - resolve target
                    - connect to it (trying alternatives as presented)
                    - perform handshakes */
-grpc_channel *grpc_channel_create(const char *target,
-                                  const grpc_channel_args *args) {
+grpc_channel *grpc_insecure_channel_create(const char *target,
+                                           const grpc_channel_args *args) {
   grpc_channel *channel = NULL;
 #define MAX_FILTERS 3
   const grpc_channel_filter *filters[MAX_FILTERS];
@@ -168,18 +171,22 @@ grpc_channel *grpc_channel_create(const char *target,
   filters[n++] = &grpc_client_channel_filter;
   GPR_ASSERT(n <= MAX_FILTERS);
 
+  channel =
+      grpc_channel_create_from_filters(target, filters, n, args, mdctx, 1);
+
   f = gpr_malloc(sizeof(*f));
   f->base.vtable = &subchannel_factory_vtable;
   gpr_ref_init(&f->refs, 1);
   grpc_mdctx_ref(mdctx);
   f->mdctx = mdctx;
   f->merge_args = grpc_channel_args_copy(args);
+  f->master = channel;
+  GRPC_CHANNEL_INTERNAL_REF(f->master, "subchannel_factory");
   resolver = grpc_resolver_create(target, &f->base);
   if (!resolver) {
     return NULL;
   }
 
-  channel = grpc_channel_create_from_filters(filters, n, args, mdctx, 1);
   grpc_client_channel_set_resolver(grpc_channel_get_channel_stack(channel),
                                    resolver);
   GRPC_RESOLVER_UNREF(resolver, "create");
diff --git a/src/core/surface/completion_queue.c b/src/core/surface/completion_queue.c
index 3f60b0b0ba..36d69cfe5f 100644
--- a/src/core/surface/completion_queue.c
+++ b/src/core/surface/completion_queue.c
@@ -45,6 +45,11 @@
 #include <grpc/support/atm.h>
 #include <grpc/support/log.h>
 
+typedef struct {
+  grpc_pollset_worker *worker;
+  void *tag;
+} plucker;
+
 /* Completion queue structure */
 struct grpc_completion_queue {
   /** completed events */
@@ -60,6 +65,8 @@ struct grpc_completion_queue {
   int shutdown;
   int shutdown_called;
   int is_server_cq;
+  int num_pluckers;
+  plucker pluckers[GRPC_MAX_COMPLETION_QUEUE_PLUCKERS];
 };
 
 grpc_completion_queue *grpc_completion_queue_create(void) {
@@ -107,6 +114,11 @@ void grpc_cq_internal_unref(grpc_completion_queue *cc) {
 }
 
 void grpc_cq_begin_op(grpc_completion_queue *cc) {
+#ifndef NDEBUG
+  gpr_mu_lock(GRPC_POLLSET_MU(&cc->pollset));
+  GPR_ASSERT(!cc->shutdown_called);
+  gpr_mu_unlock(GRPC_POLLSET_MU(&cc->pollset));
+#endif
   gpr_ref(&cc->pending_events);
 }
 
@@ -117,6 +129,8 @@ void grpc_cq_end_op(grpc_completion_queue *cc, void *tag, int success,
                     void (*done)(void *done_arg, grpc_cq_completion *storage),
                     void *done_arg, grpc_cq_completion *storage) {
   int shutdown;
+  int i;
+  grpc_pollset_worker *pluck_worker;
 
   storage->tag = tag;
   storage->done = done;
@@ -130,7 +144,14 @@ void grpc_cq_end_op(grpc_completion_queue *cc, void *tag, int success,
     cc->completed_tail->next =
         ((gpr_uintptr)storage) | (1u & (gpr_uintptr)cc->completed_tail->next);
     cc->completed_tail = storage;
-    grpc_pollset_kick(&cc->pollset);
+    pluck_worker = NULL;
+    for (i = 0; i < cc->num_pluckers; i++) {
+      if (cc->pluckers[i].tag == tag) {
+        pluck_worker = cc->pluckers[i].worker;
+        break;
+      }
+    }
+    grpc_pollset_kick(&cc->pollset, pluck_worker);
     gpr_mu_unlock(GRPC_POLLSET_MU(&cc->pollset));
   } else {
     cc->completed_tail->next =
@@ -147,6 +168,7 @@ void grpc_cq_end_op(grpc_completion_queue *cc, void *tag, int success,
 grpc_event grpc_completion_queue_next(grpc_completion_queue *cc,
                                       gpr_timespec deadline) {
   grpc_event ret;
+  grpc_pollset_worker worker;
 
   deadline = gpr_convert_clock_type(deadline, GPR_CLOCK_MONOTONIC);
 
@@ -172,7 +194,7 @@ grpc_event grpc_completion_queue_next(grpc_completion_queue *cc,
       ret.type = GRPC_QUEUE_SHUTDOWN;
       break;
     }
-    if (!grpc_pollset_work(&cc->pollset, deadline)) {
+    if (!grpc_pollset_work(&cc->pollset, &worker, deadline)) {
       gpr_mu_unlock(GRPC_POLLSET_MU(&cc->pollset));
       memset(&ret, 0, sizeof(ret));
       ret.type = GRPC_QUEUE_TIMEOUT;
@@ -184,11 +206,37 @@ grpc_event grpc_completion_queue_next(grpc_completion_queue *cc,
   return ret;
 }
 
+static int add_plucker(grpc_completion_queue *cc, void *tag,
+                       grpc_pollset_worker *worker) {
+  if (cc->num_pluckers == GRPC_MAX_COMPLETION_QUEUE_PLUCKERS) {
+    return 0;
+  }
+  cc->pluckers[cc->num_pluckers].tag = tag;
+  cc->pluckers[cc->num_pluckers].worker = worker;
+  cc->num_pluckers++;
+  return 1;
+}
+
+static void del_plucker(grpc_completion_queue *cc, void *tag,
+                        grpc_pollset_worker *worker) {
+  int i;
+  for (i = 0; i < cc->num_pluckers; i++) {
+    if (cc->pluckers[i].tag == tag && cc->pluckers[i].worker == worker) {
+      cc->num_pluckers--;
+      GPR_SWAP(plucker, cc->pluckers[i], cc->pluckers[cc->num_pluckers]);
+      return;
+    }
+  }
+  gpr_log(GPR_ERROR, "should never reach here");
+  abort();
+}
+
 grpc_event grpc_completion_queue_pluck(grpc_completion_queue *cc, void *tag,
                                        gpr_timespec deadline) {
   grpc_event ret;
   grpc_cq_completion *c;
   grpc_cq_completion *prev;
+  grpc_pollset_worker worker;
 
   deadline = gpr_convert_clock_type(deadline, GPR_CLOCK_MONOTONIC);
 
@@ -219,12 +267,24 @@ grpc_event grpc_completion_queue_pluck(grpc_completion_queue *cc, void *tag,
       ret.type = GRPC_QUEUE_SHUTDOWN;
       break;
     }
-    if (!grpc_pollset_work(&cc->pollset, deadline)) {
+    if (!add_plucker(cc, tag, &worker)) {
+      gpr_log(GPR_DEBUG, 
+              "Too many outstanding grpc_completion_queue_pluck calls: maximum is %d",
+              GRPC_MAX_COMPLETION_QUEUE_PLUCKERS);
       gpr_mu_unlock(GRPC_POLLSET_MU(&cc->pollset));
       memset(&ret, 0, sizeof(ret));
+      /* TODO(ctiller): should we use a different result here */
       ret.type = GRPC_QUEUE_TIMEOUT;
       break;
     }
+    if (!grpc_pollset_work(&cc->pollset, &worker, deadline)) {
+      del_plucker(cc, tag, &worker);
+      gpr_mu_unlock(GRPC_POLLSET_MU(&cc->pollset));
+      memset(&ret, 0, sizeof(ret));
+      ret.type = GRPC_QUEUE_TIMEOUT;
+      break;
+    }
+    del_plucker(cc, tag, &worker);
   }
 done:
   GRPC_SURFACE_TRACE_RETURNED_EVENT(cc, &ret);
@@ -261,15 +321,6 @@ grpc_pollset *grpc_cq_pollset(grpc_completion_queue *cc) {
   return &cc->pollset;
 }
 
-void grpc_cq_hack_spin_pollset(grpc_completion_queue *cc) {
-  gpr_mu_lock(GRPC_POLLSET_MU(&cc->pollset));
-  grpc_pollset_kick(&cc->pollset);
-  grpc_pollset_work(&cc->pollset,
-                    gpr_time_add(gpr_now(GPR_CLOCK_REALTIME),
-                                 gpr_time_from_millis(100, GPR_TIMESPAN)));
-  gpr_mu_unlock(GRPC_POLLSET_MU(&cc->pollset));
-}
-
 void grpc_cq_mark_server_cq(grpc_completion_queue *cc) { cc->is_server_cq = 1; }
 
 int grpc_cq_is_server_cq(grpc_completion_queue *cc) { return cc->is_server_cq; }
diff --git a/src/core/surface/completion_queue.h b/src/core/surface/completion_queue.h
index f944f48d8e..8de024aaea 100644
--- a/src/core/surface/completion_queue.h
+++ b/src/core/surface/completion_queue.h
@@ -77,8 +77,6 @@ void grpc_cq_end_op(grpc_completion_queue *cc, void *tag, int success,
 
 grpc_pollset *grpc_cq_pollset(grpc_completion_queue *cc);
 
-void grpc_cq_hack_spin_pollset(grpc_completion_queue *cc);
-
 void grpc_cq_mark_server_cq(grpc_completion_queue *cc);
 int grpc_cq_is_server_cq(grpc_completion_queue *cc);
 
diff --git a/src/core/surface/init.c b/src/core/surface/init.c
index 04e27d30ac..442bc72f21 100644
--- a/src/core/surface/init.c
+++ b/src/core/surface/init.c
@@ -39,6 +39,7 @@
 #include "src/core/channel/channel_stack.h"
 #include "src/core/client_config/resolver_registry.h"
 #include "src/core/client_config/resolvers/dns_resolver.h"
+#include "src/core/client_config/resolvers/sockaddr_resolver.h"
 #include "src/core/debug/trace.h"
 #include "src/core/iomgr/iomgr.h"
 #include "src/core/profiling/timers.h"
@@ -46,10 +47,7 @@
 #include "src/core/surface/init.h"
 #include "src/core/surface/surface_trace.h"
 #include "src/core/transport/chttp2_transport.h"
-
-#ifdef GPR_POSIX_SOCKET
-#include "src/core/client_config/resolvers/unix_resolver_posix.h"
-#endif
+#include "src/core/transport/connectivity_state.h"
 
 static gpr_once g_basic_init = GPR_ONCE_INIT;
 static gpr_mu g_init_mu;
@@ -68,6 +66,8 @@ void grpc_init(void) {
     gpr_time_init();
     grpc_resolver_registry_init("dns:///");
     grpc_register_resolver_type("dns", grpc_dns_resolver_factory_create());
+    grpc_register_resolver_type("ipv4", grpc_ipv4_resolver_factory_create());
+    grpc_register_resolver_type("ipv6", grpc_ipv6_resolver_factory_create());
 #ifdef GPR_POSIX_SOCKET
     grpc_register_resolver_type("unix", grpc_unix_resolver_factory_create());
 #endif
@@ -76,11 +76,15 @@ void grpc_init(void) {
     grpc_register_tracer("http", &grpc_http_trace);
     grpc_register_tracer("flowctl", &grpc_flowctl_trace);
     grpc_register_tracer("batch", &grpc_trace_batch);
+    grpc_register_tracer("connectivity_state", &grpc_connectivity_state_trace);
     grpc_security_pre_init();
     grpc_iomgr_init();
     grpc_tracer_init("GRPC_TRACE");
-    if (census_initialize(CENSUS_NONE)) {
-      gpr_log(GPR_ERROR, "Could not initialize census.");
+    /* Only initialize census if noone else has. */
+    if (census_enabled() == CENSUS_FEATURE_NONE) {
+      if (census_initialize(census_supported())) { /* enable all features. */
+        gpr_log(GPR_ERROR, "Could not initialize census.");
+      }
     }
     grpc_timers_global_init();
   }
diff --git a/src/core/surface/lame_client.c b/src/core/surface/lame_client.c
index 3f2bb5c8a9..c4215a2cfb 100644
--- a/src/core/surface/lame_client.c
+++ b/src/core/surface/lame_client.c
@@ -47,7 +47,10 @@ typedef struct {
   grpc_linked_mdelem details;
 } call_data;
 
-typedef struct { grpc_mdctx *mdctx; } channel_data;
+typedef struct {
+  grpc_mdctx *mdctx;
+  grpc_channel *master;
+} channel_data;
 
 static void lame_start_transport_stream_op(grpc_call_element *elem,
                                            grpc_transport_stream_op *op) {
@@ -82,6 +85,11 @@ static void lame_start_transport_stream_op(grpc_call_element *elem,
   }
 }
 
+static char *lame_get_peer(grpc_call_element *elem) {
+  channel_data *chand = elem->channel_data;
+  return grpc_channel_get_target(chand->master);
+}
+
 static void lame_start_transport_op(grpc_channel_element *elem,
                                     grpc_transport_op *op) {
   if (op->on_connectivity_state_change) {
@@ -112,6 +120,7 @@ static void init_channel_elem(grpc_channel_element *elem, grpc_channel *master,
   GPR_ASSERT(is_first);
   GPR_ASSERT(is_last);
   chand->mdctx = mdctx;
+  chand->master = master;
 }
 
 static void destroy_channel_elem(grpc_channel_element *elem) {}
@@ -125,11 +134,12 @@ static const grpc_channel_filter lame_filter = {
     sizeof(channel_data),
     init_channel_elem,
     destroy_channel_elem,
+    lame_get_peer,
     "lame-client",
 };
 
-grpc_channel *grpc_lame_client_channel_create(void) {
+grpc_channel *grpc_lame_client_channel_create(const char *target) {
   static const grpc_channel_filter *filters[] = {&lame_filter};
-  return grpc_channel_create_from_filters(filters, 1, NULL, grpc_mdctx_create(),
-                                          1);
+  return grpc_channel_create_from_filters(target, filters, 1, NULL,
+                                          grpc_mdctx_create(), 1);
 }
diff --git a/src/core/surface/secure_channel_create.c b/src/core/surface/secure_channel_create.c
index d87ec97b53..c3150250b8 100644
--- a/src/core/surface/secure_channel_create.c
+++ b/src/core/surface/secure_channel_create.c
@@ -88,8 +88,8 @@ static void on_secure_transport_setup_done(void *arg,
         c->args.channel_args, secure_endpoint, c->args.metadata_context, 1);
     grpc_chttp2_transport_start_reading(c->result->transport, NULL, 0);
     c->result->filters = gpr_malloc(sizeof(grpc_channel_filter *) * 2);
-    c->result->filters[0] = &grpc_client_auth_filter;
-    c->result->filters[1] = &grpc_http_client_filter;
+    c->result->filters[0] = &grpc_http_client_filter;
+    c->result->filters[1] = &grpc_client_auth_filter;
     c->result->num_filters = 2;
   }
   notify = c->notify;
@@ -134,6 +134,7 @@ typedef struct {
   grpc_mdctx *mdctx;
   grpc_channel_args *merge_args;
   grpc_channel_security_connector *security_connector;
+  grpc_channel *master;
 } subchannel_factory;
 
 static void subchannel_factory_ref(grpc_subchannel_factory *scf) {
@@ -146,6 +147,7 @@ static void subchannel_factory_unref(grpc_subchannel_factory *scf) {
   if (gpr_unref(&f->refs)) {
     GRPC_SECURITY_CONNECTOR_UNREF(&f->security_connector->base,
                                   "subchannel_factory");
+    GRPC_CHANNEL_INTERNAL_UNREF(f->master, "subchannel_factory");
     grpc_channel_args_destroy(f->merge_args);
     grpc_mdctx_unref(f->mdctx);
     gpr_free(f);
@@ -165,6 +167,7 @@ static grpc_subchannel *subchannel_factory_create_subchannel(
   gpr_ref_init(&c->refs, 1);
   args->mdctx = f->mdctx;
   args->args = final_args;
+  args->master = f->master;
   s = grpc_subchannel_create(&c->base, args);
   grpc_connector_unref(&c->base);
   grpc_channel_args_destroy(final_args);
@@ -196,13 +199,13 @@ grpc_channel *grpc_secure_channel_create(grpc_credentials *creds,
 
   if (grpc_find_security_connector_in_args(args) != NULL) {
     gpr_log(GPR_ERROR, "Cannot set security context in channel args.");
-    return grpc_lame_client_channel_create();
+    return grpc_lame_client_channel_create(target);
   }
 
   if (grpc_credentials_create_security_connector(
           creds, target, args, NULL, &connector, &new_args_from_connector) !=
       GRPC_SECURITY_OK) {
-    return grpc_lame_client_channel_create();
+    return grpc_lame_client_channel_create(target);
   }
   mdctx = grpc_mdctx_create();
 
@@ -218,6 +221,9 @@ grpc_channel *grpc_secure_channel_create(grpc_credentials *creds,
   filters[n++] = &grpc_client_channel_filter;
   GPR_ASSERT(n <= MAX_FILTERS);
 
+  channel =
+      grpc_channel_create_from_filters(target, filters, n, args_copy, mdctx, 1);
+
   f = gpr_malloc(sizeof(*f));
   f->base.vtable = &subchannel_factory_vtable;
   gpr_ref_init(&f->refs, 1);
@@ -226,12 +232,13 @@ grpc_channel *grpc_secure_channel_create(grpc_credentials *creds,
   GRPC_SECURITY_CONNECTOR_REF(&connector->base, "subchannel_factory");
   f->security_connector = connector;
   f->merge_args = grpc_channel_args_copy(args_copy);
+  f->master = channel;
+  GRPC_CHANNEL_INTERNAL_REF(channel, "subchannel_factory");
   resolver = grpc_resolver_create(target, &f->base);
   if (!resolver) {
     return NULL;
   }
 
-  channel = grpc_channel_create_from_filters(filters, n, args_copy, mdctx, 1);
   grpc_client_channel_set_resolver(grpc_channel_get_channel_stack(channel),
                                    resolver);
   GRPC_RESOLVER_UNREF(resolver, "create");
diff --git a/src/core/surface/server.c b/src/core/surface/server.c
index 439452aea2..cd1dc589e1 100644
--- a/src/core/surface/server.c
+++ b/src/core/surface/server.c
@@ -327,6 +327,14 @@ static void request_matcher_zombify_all_pending_calls(
   }
 }
 
+static void request_matcher_kill_requests(grpc_server *server,
+                                          request_matcher *rm) {
+  int request_id;
+  while ((request_id = gpr_stack_lockfree_pop(rm->requests)) != -1) {
+    fail_call(server, &server->requested_calls[request_id]);
+  }
+}
+
 /*
  * server proper
  */
@@ -400,6 +408,15 @@ static void finish_start_new_rpc(grpc_server *server, grpc_call_element *elem,
   call_data *calld = elem->call_data;
   int request_id;
 
+  if (gpr_atm_acq_load(&server->shutdown_flag)) {
+    gpr_mu_lock(&calld->mu_state);
+    calld->state = ZOMBIED;
+    gpr_mu_unlock(&calld->mu_state);
+    grpc_iomgr_closure_init(&calld->kill_zombie_closure, kill_zombie, elem);
+    grpc_iomgr_add_callback(&calld->kill_zombie_closure);
+    return;
+  }
+
   request_id = gpr_stack_lockfree_pop(request_matcher->requests);
   if (request_id == -1) {
     gpr_mu_lock(&server->mu_call);
@@ -483,12 +500,25 @@ static int num_channels(grpc_server *server) {
   return n;
 }
 
+static void kill_pending_work_locked(grpc_server *server) {
+  registered_method *rm;
+  request_matcher_kill_requests(server, &server->unregistered_request_matcher);
+  request_matcher_zombify_all_pending_calls(
+      &server->unregistered_request_matcher);
+  for (rm = server->registered_methods; rm; rm = rm->next) {
+    request_matcher_kill_requests(server, &rm->request_matcher);
+    request_matcher_zombify_all_pending_calls(&rm->request_matcher);
+  }
+}
+
 static void maybe_finish_shutdown(grpc_server *server) {
   size_t i;
   if (!gpr_atm_acq_load(&server->shutdown_flag) || server->shutdown_published) {
     return;
   }
 
+  kill_pending_work_locked(server);
+
   if (server->root_channel_data.next != &server->root_channel_data ||
       server->listeners_destroyed < num_listeners(server)) {
     if (gpr_time_cmp(gpr_time_sub(gpr_now(GPR_CLOCK_REALTIME),
@@ -530,6 +560,7 @@ static grpc_mdelem *server_filter(void *user_data, grpc_mdelem *md) {
 static void server_on_recv(void *ptr, int success) {
   grpc_call_element *elem = ptr;
   call_data *calld = elem->call_data;
+  gpr_timespec op_deadline;
 
   if (success && !calld->got_initial_metadata) {
     size_t i;
@@ -539,12 +570,15 @@ static void server_on_recv(void *ptr, int success) {
       grpc_stream_op *op = &ops[i];
       if (op->type != GRPC_OP_METADATA) continue;
       grpc_metadata_batch_filter(&op->data.metadata, server_filter, elem);
-      if (0 != gpr_time_cmp(op->data.metadata.deadline,
-                            gpr_inf_future(GPR_CLOCK_REALTIME))) {
+      op_deadline = op->data.metadata.deadline;
+      if (0 !=
+          gpr_time_cmp(op_deadline, gpr_inf_future(op_deadline.clock_type))) {
         calld->deadline = op->data.metadata.deadline;
       }
-      calld->got_initial_metadata = 1;
-      start_new_rpc(elem);
+      if (calld->host && calld->path) {
+        calld->got_initial_metadata = 1;
+        start_new_rpc(elem);
+      }
       break;
     }
   }
@@ -610,8 +644,8 @@ static void accept_stream(void *cd, grpc_transport *transport,
                           const void *transport_server_data) {
   channel_data *chand = cd;
   /* create a call */
-  grpc_call_create(chand->channel, NULL, transport_server_data, NULL, 0,
-                   gpr_inf_future(GPR_CLOCK_REALTIME));
+  grpc_call_create(chand->channel, NULL, 0, NULL, transport_server_data, NULL,
+                   0, gpr_inf_future(GPR_CLOCK_MONOTONIC));
 }
 
 static void channel_connectivity_changed(void *cd, int iomgr_status_ignored) {
@@ -677,8 +711,8 @@ static void init_channel_elem(grpc_channel_element *elem, grpc_channel *master,
   GPR_ASSERT(!is_last);
   chand->server = NULL;
   chand->channel = NULL;
-  chand->path_key = grpc_mdstr_from_string(metadata_context, ":path");
-  chand->authority_key = grpc_mdstr_from_string(metadata_context, ":authority");
+  chand->path_key = grpc_mdstr_from_string(metadata_context, ":path", 0);
+  chand->authority_key = grpc_mdstr_from_string(metadata_context, ":authority", 0);
   chand->next = chand->prev = chand;
   chand->registered_methods = NULL;
   chand->connectivity_state = GRPC_CHANNEL_IDLE;
@@ -722,6 +756,7 @@ static const grpc_channel_filter server_surface_filter = {
     sizeof(channel_data),
     init_channel_elem,
     destroy_channel_elem,
+    grpc_call_next_get_peer,
     "server",
 };
 
@@ -878,8 +913,8 @@ void grpc_server_setup_transport(grpc_server *s, grpc_transport *transport,
     grpc_transport_perform_op(transport, &op);
   }
 
-  channel =
-      grpc_channel_create_from_filters(filters, num_filters, args, mdctx, 0);
+  channel = grpc_channel_create_from_filters(NULL, filters, num_filters, args,
+                                             mdctx, 0);
   chand = (channel_data *)grpc_channel_stack_element(
               grpc_channel_get_channel_stack(channel), 0)
               ->channel_data;
@@ -899,8 +934,8 @@ void grpc_server_setup_transport(grpc_server *s, grpc_transport *transport,
     chand->registered_methods = gpr_malloc(alloc);
     memset(chand->registered_methods, 0, alloc);
     for (rm = s->registered_methods; rm; rm = rm->next) {
-      host = rm->host ? grpc_mdstr_from_string(mdctx, rm->host) : NULL;
-      method = grpc_mdstr_from_string(mdctx, rm->method);
+      host = rm->host ? grpc_mdstr_from_string(mdctx, rm->host, 0) : NULL;
+      method = grpc_mdstr_from_string(mdctx, rm->method, 0);
       hash = GRPC_MDSTR_KV_HASH(host ? host->hash : 0, method->hash);
       for (probes = 0; chand->registered_methods[(hash + probes) % slots]
                            .server_registered_method != NULL;
@@ -933,52 +968,15 @@ void grpc_server_setup_transport(grpc_server *s, grpc_transport *transport,
   op.set_accept_stream_user_data = chand;
   op.on_connectivity_state_change = &chand->channel_connectivity_changed;
   op.connectivity_state = &chand->connectivity_state;
+  op.disconnect = gpr_atm_acq_load(&s->shutdown_flag);
   grpc_transport_perform_op(transport, &op);
 }
 
-typedef struct {
-  requested_call **requests;
-  size_t count;
-  size_t capacity;
-} request_killer;
-
-static void request_killer_init(request_killer *rk) {
-  memset(rk, 0, sizeof(*rk));
-}
-
-static void request_killer_add(request_killer *rk, requested_call *rc) {
-  if (rk->capacity == rk->count) {
-    rk->capacity = GPR_MAX(8, rk->capacity * 2);
-    rk->requests =
-        gpr_realloc(rk->requests, rk->capacity * sizeof(*rk->requests));
-  }
-  rk->requests[rk->count++] = rc;
-}
-
-static void request_killer_add_request_matcher(request_killer *rk,
-                                               grpc_server *server,
-                                               request_matcher *rm) {
-  int request_id;
-  while ((request_id = gpr_stack_lockfree_pop(rm->requests)) != -1) {
-    request_killer_add(rk, &server->requested_calls[request_id]);
-  }
-}
-
-static void request_killer_run(request_killer *rk, grpc_server *server) {
-  size_t i;
-  for (i = 0; i < rk->count; i++) {
-    fail_call(server, rk->requests[i]);
-  }
-  gpr_free(rk->requests);
-}
-
 void grpc_server_shutdown_and_notify(grpc_server *server,
                                      grpc_completion_queue *cq, void *tag) {
   listener *l;
-  registered_method *rm;
   shutdown_tag *sdt;
   channel_broadcaster broadcaster;
-  request_killer reqkill;
 
   GRPC_SERVER_LOG_SHUTDOWN(GPR_INFO, server, cq, tag);
 
@@ -999,27 +997,16 @@ void grpc_server_shutdown_and_notify(grpc_server *server,
   server->last_shutdown_message_time = gpr_now(GPR_CLOCK_REALTIME);
 
   channel_broadcaster_init(server, &broadcaster);
-  request_killer_init(&reqkill);
 
   /* collect all unregistered then registered calls */
   gpr_mu_lock(&server->mu_call);
-  request_killer_add_request_matcher(&reqkill, server,
-                                     &server->unregistered_request_matcher);
-  request_matcher_zombify_all_pending_calls(
-      &server->unregistered_request_matcher);
-  for (rm = server->registered_methods; rm; rm = rm->next) {
-    request_killer_add_request_matcher(&reqkill, server, &rm->request_matcher);
-    request_matcher_zombify_all_pending_calls(&rm->request_matcher);
-  }
+  kill_pending_work_locked(server);
   gpr_mu_unlock(&server->mu_call);
 
   gpr_atm_rel_store(&server->shutdown_flag, 1);
   maybe_finish_shutdown(server);
   gpr_mu_unlock(&server->mu_global);
 
-  /* terminate all the requested calls */
-  request_killer_run(&reqkill, server);
-
   /* Shutdown listeners */
   for (l = server->listeners; l; l = l->next) {
     l->destroy(server, l->arg);
@@ -1259,6 +1246,8 @@ static void done_request_event(void *req, grpc_cq_completion *c) {
   } else {
     gpr_free(req);
   }
+
+  server_unref(server);
 }
 
 static void fail_call(grpc_server *server, requested_call *rc) {
@@ -1271,6 +1260,7 @@ static void fail_call(grpc_server *server, requested_call *rc) {
       rc->data.registered.initial_metadata->count = 0;
       break;
   }
+  server_ref(server);
   grpc_cq_end_op(rc->cq_for_notification, rc->tag, 0, done_request_event, rc,
                  &rc->completion);
 }
@@ -1281,6 +1271,8 @@ static void publish_registered_or_batch(grpc_call *call, int success,
       grpc_call_stack_element(grpc_call_get_call_stack(call), 0);
   requested_call *rc = prc;
   call_data *calld = elem->call_data;
+  channel_data *chand = elem->channel_data;
+  server_ref(chand->server);
   grpc_cq_end_op(calld->cq_new, rc->tag, success, done_request_event, rc,
                  &rc->completion);
   GRPC_CALL_INTERNAL_UNREF(call, "server", 0);
diff --git a/src/core/surface/server_chttp2.c b/src/core/surface/server_chttp2.c
index 78c53466b3..4ab845bc00 100644
--- a/src/core/surface/server_chttp2.c
+++ b/src/core/surface/server_chttp2.c
@@ -80,7 +80,7 @@ static void destroy(grpc_server *server, void *tcpp) {
   grpc_tcp_server_destroy(tcp, grpc_server_listener_destroy_done, server);
 }
 
-int grpc_server_add_http2_port(grpc_server *server, const char *addr) {
+int grpc_server_add_insecure_http2_port(grpc_server *server, const char *addr) {
   grpc_resolved_addresses *resolved = NULL;
   grpc_tcp_server *tcp = NULL;
   size_t i;
diff --git a/src/core/transport/chttp2/alpn.c b/src/core/transport/chttp2/alpn.c
index 3ccd5796ba..69da4e6718 100644
--- a/src/core/transport/chttp2/alpn.c
+++ b/src/core/transport/chttp2/alpn.c
@@ -36,8 +36,7 @@
 #include <grpc/support/useful.h>
 
 /* in order of preference */
-static const char *const supported_versions[] = {"h2", "h2-17", "h2-16",
-                                                 "h2-15", "h2-14"};
+static const char *const supported_versions[] = {"h2"};
 
 int grpc_chttp2_is_alpn_version_supported(const char *version, size_t size) {
   size_t i;
diff --git a/src/core/transport/chttp2/internal.h b/src/core/transport/chttp2/internal.h
index e5e6f445b7..42cf0ecd5b 100644
--- a/src/core/transport/chttp2/internal.h
+++ b/src/core/transport/chttp2/internal.h
@@ -60,7 +60,6 @@ typedef enum {
   GRPC_CHTTP2_LIST_WRITABLE,
   GRPC_CHTTP2_LIST_WRITING,
   GRPC_CHTTP2_LIST_WRITTEN,
-  GRPC_CHTTP2_LIST_WRITABLE_WINDOW_UPDATE,
   GRPC_CHTTP2_LIST_PARSING_SEEN,
   GRPC_CHTTP2_LIST_CLOSED_WAITING_FOR_PARSING,
   GRPC_CHTTP2_LIST_CANCELLED_WAITING_FOR_WRITING,
@@ -120,6 +119,10 @@ typedef enum {
   GRPC_WRITE_STATE_SENT_CLOSE
 } grpc_chttp2_write_state;
 
+/* flags that can be or'd into stream_global::writing_now */
+#define GRPC_CHTTP2_WRITING_DATA 1
+#define GRPC_CHTTP2_WRITING_WINDOW 2
+
 typedef enum {
   GRPC_DONT_SEND_CLOSED = 0,
   GRPC_SEND_CLOSED,
@@ -286,6 +289,7 @@ struct grpc_chttp2_transport {
   grpc_endpoint *ep;
   grpc_mdctx *metadata_context;
   gpr_refcount refs;
+  char *peer_string;
 
   gpr_mu mu;
 
@@ -382,6 +386,10 @@ typedef struct {
   gpr_uint8 published_cancelled;
   /** is this stream in the stream map? (boolean) */
   gpr_uint8 in_stream_map;
+  /** bitmask of GRPC_CHTTP2_WRITING_xxx above */
+  gpr_uint8 writing_now;
+  /** has anything been written to this stream? */
+  gpr_uint8 written_anything;
 
   /** stream state already published to the upper layer */
   grpc_stream_state published_state;
@@ -474,11 +482,17 @@ void grpc_chttp2_publish_reads(grpc_chttp2_transport_global *global,
 void grpc_chttp2_list_add_writable_stream(
     grpc_chttp2_transport_global *transport_global,
     grpc_chttp2_stream_global *stream_global);
+void grpc_chttp2_list_add_first_writable_stream(
+    grpc_chttp2_transport_global *transport_global,
+    grpc_chttp2_stream_global *stream_global);
 int grpc_chttp2_list_pop_writable_stream(
     grpc_chttp2_transport_global *transport_global,
     grpc_chttp2_transport_writing *transport_writing,
     grpc_chttp2_stream_global **stream_global,
     grpc_chttp2_stream_writing **stream_writing);
+void grpc_chttp2_list_remove_writable_stream(
+    grpc_chttp2_transport_global *transport_global,
+    grpc_chttp2_stream_global *stream_global);
 
 void grpc_chttp2_list_add_incoming_window_updated(
     grpc_chttp2_transport_global *transport_global,
@@ -510,18 +524,6 @@ int grpc_chttp2_list_pop_written_stream(
     grpc_chttp2_stream_global **stream_global,
     grpc_chttp2_stream_writing **stream_writing);
 
-void grpc_chttp2_list_add_writable_window_update_stream(
-    grpc_chttp2_transport_global *transport_global,
-    grpc_chttp2_stream_global *stream_global);
-int grpc_chttp2_list_pop_writable_window_update_stream(
-    grpc_chttp2_transport_global *transport_global,
-    grpc_chttp2_transport_writing *transport_writing,
-    grpc_chttp2_stream_global **stream_global,
-    grpc_chttp2_stream_writing **stream_writing);
-void grpc_chttp2_list_remove_writable_window_update_stream(
-    grpc_chttp2_transport_global *transport_global,
-    grpc_chttp2_stream_global *stream_global);
-
 void grpc_chttp2_list_add_parsing_seen_stream(
     grpc_chttp2_transport_parsing *transport_parsing,
     grpc_chttp2_stream_parsing *stream_parsing);
diff --git a/src/core/transport/chttp2/parsing.c b/src/core/transport/chttp2/parsing.c
index 904b9afce7..d84960009b 100644
--- a/src/core/transport/chttp2/parsing.c
+++ b/src/core/transport/chttp2/parsing.c
@@ -182,8 +182,7 @@ void grpc_chttp2_publish_reads(
       stream_global->max_recv_bytes -= 
           stream_parsing->incoming_window_delta;
       stream_parsing->incoming_window_delta = 0;
-      grpc_chttp2_list_add_writable_window_update_stream(transport_global,
-                                                         stream_global);
+      grpc_chttp2_list_add_writable_stream(transport_global, stream_global);
     }
 
     /* update outgoing flow control window */
@@ -607,7 +606,7 @@ static void on_header(void *tp, grpc_mdelem *md) {
     }
     grpc_chttp2_incoming_metadata_buffer_set_deadline(
         &stream_parsing->incoming_metadata,
-        gpr_time_add(gpr_now(GPR_CLOCK_REALTIME), *cached_timeout));
+        gpr_time_add(gpr_now(GPR_CLOCK_MONOTONIC), *cached_timeout));
     GRPC_MDELEM_UNREF(md);
   } else {
     grpc_chttp2_incoming_metadata_buffer_add(&stream_parsing->incoming_metadata,
diff --git a/src/core/transport/chttp2/stream_encoder.c b/src/core/transport/chttp2/stream_encoder.c
index 65b31a5afd..0f04169741 100644
--- a/src/core/transport/chttp2/stream_encoder.c
+++ b/src/core/transport/chttp2/stream_encoder.c
@@ -441,7 +441,7 @@ static void deadline_enc(grpc_chttp2_hpack_compressor *c, gpr_timespec deadline,
       gpr_time_sub(deadline, gpr_now(deadline.clock_type)), timeout_str);
   mdelem = grpc_mdelem_from_metadata_strings(
       c->mdctx, GRPC_MDSTR_REF(c->timeout_key_str),
-      grpc_mdstr_from_string(c->mdctx, timeout_str));
+      grpc_mdstr_from_string(c->mdctx, timeout_str, 0));
   mdelem = hpack_enc(c, mdelem, st);
   if (mdelem) GRPC_MDELEM_UNREF(mdelem);
 }
@@ -456,7 +456,7 @@ void grpc_chttp2_hpack_compressor_init(grpc_chttp2_hpack_compressor *c,
                                        grpc_mdctx *ctx) {
   memset(c, 0, sizeof(*c));
   c->mdctx = ctx;
-  c->timeout_key_str = grpc_mdstr_from_string(ctx, "grpc-timeout");
+  c->timeout_key_str = grpc_mdstr_from_string(ctx, "grpc-timeout", 0);
 }
 
 void grpc_chttp2_hpack_compressor_destroy(grpc_chttp2_hpack_compressor *c) {
diff --git a/src/core/transport/chttp2/stream_lists.c b/src/core/transport/chttp2/stream_lists.c
index 590f6abfbc..9c3ad7a777 100644
--- a/src/core/transport/chttp2/stream_lists.c
+++ b/src/core/transport/chttp2/stream_lists.c
@@ -108,6 +108,23 @@ static void stream_list_maybe_remove(grpc_chttp2_transport *t,
   }
 }
 
+static void stream_list_add_head(grpc_chttp2_transport *t,
+                                 grpc_chttp2_stream *s,
+                                 grpc_chttp2_stream_list_id id) {
+  grpc_chttp2_stream *old_head;
+  GPR_ASSERT(!s->included[id]);
+  old_head = t->lists[id].head;
+  s->links[id].next = old_head;
+  s->links[id].prev = NULL;
+  if (old_head) {
+    old_head->links[id].prev = s;
+  } else {
+    t->lists[id].tail = s;
+  }
+  t->lists[id].head = s;
+  s->included[id] = 1;
+}
+
 static void stream_list_add_tail(grpc_chttp2_transport *t,
                                  grpc_chttp2_stream *s,
                                  grpc_chttp2_stream_list_id id) {
@@ -119,7 +136,6 @@ static void stream_list_add_tail(grpc_chttp2_transport *t,
   if (old_tail) {
     old_tail->links[id].next = s;
   } else {
-    s->links[id].prev = NULL;
     t->lists[id].head = s;
   }
   t->lists[id].tail = s;
@@ -144,6 +160,15 @@ void grpc_chttp2_list_add_writable_stream(
                   STREAM_FROM_GLOBAL(stream_global), GRPC_CHTTP2_LIST_WRITABLE);
 }
 
+void grpc_chttp2_list_add_first_writable_stream(
+    grpc_chttp2_transport_global *transport_global,
+    grpc_chttp2_stream_global *stream_global) {
+  GPR_ASSERT(stream_global->id != 0);
+  stream_list_add_head(TRANSPORT_FROM_GLOBAL(transport_global),
+                       STREAM_FROM_GLOBAL(stream_global),
+                       GRPC_CHTTP2_LIST_WRITABLE);
+}
+
 int grpc_chttp2_list_pop_writable_stream(
     grpc_chttp2_transport_global *transport_global,
     grpc_chttp2_transport_writing *transport_writing,
@@ -157,6 +182,14 @@ int grpc_chttp2_list_pop_writable_stream(
   return r;
 }
 
+void grpc_chttp2_list_remove_writable_stream(
+    grpc_chttp2_transport_global *transport_global,
+    grpc_chttp2_stream_global *stream_global) {
+  stream_list_maybe_remove(TRANSPORT_FROM_GLOBAL(transport_global),
+                           STREAM_FROM_GLOBAL(stream_global),
+                           GRPC_CHTTP2_LIST_WRITABLE);
+}
+
 void grpc_chttp2_list_add_writing_stream(
     grpc_chttp2_transport_writing *transport_writing,
     grpc_chttp2_stream_writing *stream_writing) {
@@ -202,36 +235,6 @@ int grpc_chttp2_list_pop_written_stream(
   return r;
 }
 
-void grpc_chttp2_list_add_writable_window_update_stream(
-    grpc_chttp2_transport_global *transport_global,
-    grpc_chttp2_stream_global *stream_global) {
-  GPR_ASSERT(stream_global->id != 0);
-  stream_list_add(TRANSPORT_FROM_GLOBAL(transport_global),
-                  STREAM_FROM_GLOBAL(stream_global),
-                  GRPC_CHTTP2_LIST_WRITABLE_WINDOW_UPDATE);
-}
-
-int grpc_chttp2_list_pop_writable_window_update_stream(
-    grpc_chttp2_transport_global *transport_global,
-    grpc_chttp2_transport_writing *transport_writing,
-    grpc_chttp2_stream_global **stream_global,
-    grpc_chttp2_stream_writing **stream_writing) {
-  grpc_chttp2_stream *stream;
-  int r = stream_list_pop(TRANSPORT_FROM_GLOBAL(transport_global), &stream,
-                          GRPC_CHTTP2_LIST_WRITABLE_WINDOW_UPDATE);
-  *stream_global = &stream->global;
-  *stream_writing = &stream->writing;
-  return r;
-}
-
-void grpc_chttp2_list_remove_writable_window_update_stream(
-    grpc_chttp2_transport_global *transport_global,
-    grpc_chttp2_stream_global *stream_global) {
-  stream_list_maybe_remove(TRANSPORT_FROM_GLOBAL(transport_global),
-                           STREAM_FROM_GLOBAL(stream_global),
-                           GRPC_CHTTP2_LIST_WRITABLE_WINDOW_UPDATE);
-}
-
 void grpc_chttp2_list_add_parsing_seen_stream(
     grpc_chttp2_transport_parsing *transport_parsing,
     grpc_chttp2_stream_parsing *stream_parsing) {
diff --git a/src/core/transport/chttp2/writing.c b/src/core/transport/chttp2/writing.c
index d8ec117aa5..b55e81fdca 100644
--- a/src/core/transport/chttp2/writing.c
+++ b/src/core/transport/chttp2/writing.c
@@ -44,6 +44,7 @@ int grpc_chttp2_unlocking_check_writes(
     grpc_chttp2_transport_writing *transport_writing) {
   grpc_chttp2_stream_global *stream_global;
   grpc_chttp2_stream_writing *stream_writing;
+  grpc_chttp2_stream_global *first_reinserted_stream = NULL;
   gpr_uint32 window_delta;
 
   /* simple writes are queued to qbuf, and flushed here */
@@ -64,50 +65,53 @@ int grpc_chttp2_unlocking_check_writes(
   }
 
   /* for each grpc_chttp2_stream that's become writable, frame it's data
-     (according to
-     available window sizes) and add to the output buffer */
-  while (grpc_chttp2_list_pop_writable_stream(transport_global,
-                                              transport_writing, &stream_global,
-                                              &stream_writing)) {
+     (according to available window sizes) and add to the output buffer */
+  while (grpc_chttp2_list_pop_writable_stream(
+      transport_global, transport_writing, &stream_global, &stream_writing)) {
+    if (stream_global == first_reinserted_stream) {
+      /* prevent infinite loop */
+      grpc_chttp2_list_add_first_writable_stream(transport_global,
+                                                 stream_global);
+      break;
+    }
+
     stream_writing->id = stream_global->id;
-    window_delta = grpc_chttp2_preencode(
-        stream_global->outgoing_sopb->ops, &stream_global->outgoing_sopb->nops,
-        GPR_MIN(transport_global->outgoing_window,
-                stream_global->outgoing_window),
-        &stream_writing->sopb);
-    GRPC_CHTTP2_FLOWCTL_TRACE_TRANSPORT(
-        "write", transport_global, outgoing_window, -(gpr_int64)window_delta);
-    GRPC_CHTTP2_FLOWCTL_TRACE_STREAM("write", transport_global, stream_global,
-                                     outgoing_window, -(gpr_int64)window_delta);
-    transport_global->outgoing_window -= window_delta;
-    stream_global->outgoing_window -= window_delta;
-
-    if (stream_global->write_state == GRPC_WRITE_STATE_QUEUED_CLOSE &&
-        stream_global->outgoing_sopb->nops == 0) {
-      if (!transport_global->is_client && !stream_global->read_closed) {
-        stream_writing->send_closed = GRPC_SEND_CLOSED_WITH_RST_STREAM;
-      } else {
-        stream_writing->send_closed = GRPC_SEND_CLOSED;
+    stream_writing->send_closed = GRPC_DONT_SEND_CLOSED;
+
+    if (stream_global->outgoing_sopb) {
+      window_delta =
+          grpc_chttp2_preencode(stream_global->outgoing_sopb->ops,
+                                &stream_global->outgoing_sopb->nops,
+                                GPR_MIN(transport_global->outgoing_window,
+                                        stream_global->outgoing_window),
+                                &stream_writing->sopb);
+      GRPC_CHTTP2_FLOWCTL_TRACE_TRANSPORT(
+          "write", transport_global, outgoing_window, -(gpr_int64)window_delta);
+      GRPC_CHTTP2_FLOWCTL_TRACE_STREAM("write", transport_global, stream_global,
+                                       outgoing_window,
+                                       -(gpr_int64)window_delta);
+      transport_global->outgoing_window -= window_delta;
+      stream_global->outgoing_window -= window_delta;
+
+      if (stream_global->write_state == GRPC_WRITE_STATE_QUEUED_CLOSE &&
+          stream_global->outgoing_sopb->nops == 0) {
+        if (!transport_global->is_client && !stream_global->read_closed) {
+          stream_writing->send_closed = GRPC_SEND_CLOSED_WITH_RST_STREAM;
+        } else {
+          stream_writing->send_closed = GRPC_SEND_CLOSED;
+        }
       }
-    }
-    if (stream_writing->sopb.nops > 0 ||
-        stream_writing->send_closed != GRPC_DONT_SEND_CLOSED) {
-      grpc_chttp2_list_add_writing_stream(transport_writing, stream_writing);
-    }
 
-    if (stream_global->outgoing_window > 0 &&
-        stream_global->outgoing_sopb->nops != 0) {
-      grpc_chttp2_list_add_writable_stream(transport_global, stream_global);
+      if (stream_global->outgoing_window > 0 &&
+          stream_global->outgoing_sopb->nops != 0) {
+        grpc_chttp2_list_add_writable_stream(transport_global, stream_global);
+        if (first_reinserted_stream == NULL &&
+            transport_global->outgoing_window == 0) {
+          first_reinserted_stream = stream_global;
+        }
+      }
     }
-  }
 
-  /* for each grpc_chttp2_stream that wants to update its window, add that
-   * window here */
-  while (grpc_chttp2_list_pop_writable_window_update_stream(transport_global,
-                                                            transport_writing,
-                                                            &stream_global,
-                                                            &stream_writing)) {
-    stream_writing->id = stream_global->id;
     if (!stream_global->read_closed && stream_global->unannounced_incoming_window > 0) {
       stream_writing->announce_window = stream_global->unannounced_incoming_window;
       GRPC_CHTTP2_FLOWCTL_TRACE_STREAM("write", transport_global, stream_global,
@@ -118,6 +122,13 @@ int grpc_chttp2_unlocking_check_writes(
       stream_global->unannounced_incoming_window = 0;
       grpc_chttp2_list_add_incoming_window_updated(transport_global,
                                                    stream_global);
+      stream_global->writing_now |= GRPC_CHTTP2_WRITING_WINDOW;
+    }
+    if (stream_writing->sopb.nops > 0 ||
+        stream_writing->send_closed != GRPC_DONT_SEND_CLOSED) {
+      stream_global->writing_now |= GRPC_CHTTP2_WRITING_DATA;
+    }
+    if (stream_global->writing_now != 0) {
       grpc_chttp2_list_add_writing_stream(transport_writing, stream_writing);
     }
   }
@@ -173,6 +184,7 @@ static void finalize_outbuf(grpc_chttp2_transport_writing *transport_writing) {
                          stream_writing->send_closed != GRPC_DONT_SEND_CLOSED,
                          stream_writing->id, &transport_writing->hpack_compressor,
                          &transport_writing->outbuf);
+      stream_writing->sopb.nops = 0;
     }
     if (stream_writing->announce_window > 0) {
       gpr_slice_buffer_add(
@@ -181,7 +193,6 @@ static void finalize_outbuf(grpc_chttp2_transport_writing *transport_writing) {
               stream_writing->id, stream_writing->announce_window));
       stream_writing->announce_window = 0;
     }
-    stream_writing->sopb.nops = 0;
     if (stream_writing->send_closed == GRPC_SEND_CLOSED_WITH_RST_STREAM) {
       gpr_slice_buffer_add(&transport_writing->outbuf,
                            grpc_chttp2_rst_stream_create(stream_writing->id,
@@ -205,20 +216,25 @@ void grpc_chttp2_cleanup_writing(
 
   while (grpc_chttp2_list_pop_written_stream(
       transport_global, transport_writing, &stream_global, &stream_writing)) {
-    if (stream_global->outgoing_sopb != NULL &&
-        stream_global->outgoing_sopb->nops == 0) {
-      stream_global->outgoing_sopb = NULL;
-      grpc_chttp2_schedule_closure(transport_global,
-                                   stream_global->send_done_closure, 1);
-    }
+    GPR_ASSERT(stream_global->writing_now != 0);
     if (stream_writing->send_closed != GRPC_DONT_SEND_CLOSED) {
       stream_global->write_state = GRPC_WRITE_STATE_SENT_CLOSE;
       if (!transport_global->is_client) {
         stream_global->read_closed = 1;
       }
-      grpc_chttp2_list_add_read_write_state_changed(transport_global,
-                                                    stream_global);
     }
+    if (stream_global->writing_now & GRPC_CHTTP2_WRITING_DATA) {
+      if (stream_global->outgoing_sopb != NULL &&
+          stream_global->outgoing_sopb->nops == 0) {
+        GPR_ASSERT(stream_global->write_state != GRPC_WRITE_STATE_QUEUED_CLOSE);
+        stream_global->outgoing_sopb = NULL;
+        grpc_chttp2_schedule_closure(transport_global,
+                                     stream_global->send_done_closure, 1);
+      }
+    }
+    stream_global->writing_now = 0;
+    grpc_chttp2_list_add_read_write_state_changed(transport_global,
+                                                  stream_global);
   }
   transport_writing->outbuf.count = 0;
   transport_writing->outbuf.length = 0;
diff --git a/src/core/transport/chttp2_transport.c b/src/core/transport/chttp2_transport.c
index c923d5e42f..a9f91b64d5 100644
--- a/src/core/transport/chttp2_transport.c
+++ b/src/core/transport/chttp2_transport.c
@@ -107,9 +107,16 @@ static void cancel_from_api(grpc_chttp2_transport_global *transport_global,
                             grpc_chttp2_stream_global *stream_global,
                             grpc_status_code status);
 
+static void close_from_api(grpc_chttp2_transport_global *transport_global,
+                           grpc_chttp2_stream_global *stream_global,
+                           grpc_status_code status,
+                           gpr_slice *optional_message);
+
 /** Add endpoint from this transport to pollset */
 static void add_to_pollset_locked(grpc_chttp2_transport *t,
                                   grpc_pollset *pollset);
+static void add_to_pollset_set_locked(grpc_chttp2_transport *t,
+                                  grpc_pollset_set *pollset_set);
 
 /** Start new streams that have been created if we can */
 static void maybe_start_some_streams(
@@ -117,7 +124,7 @@ static void maybe_start_some_streams(
 
 static void connectivity_state_set(
     grpc_chttp2_transport_global *transport_global,
-    grpc_connectivity_state state);
+    grpc_connectivity_state state, const char *reason);
 
 /*
  * CONSTRUCTION/DESTRUCTION/REFCOUNTING
@@ -168,6 +175,7 @@ static void destruct_transport(grpc_chttp2_transport *t) {
 
   grpc_mdctx_unref(t->metadata_context);
 
+  gpr_free(t->peer_string);
   gpr_free(t);
 }
 
@@ -217,6 +225,7 @@ static void init_transport(grpc_chttp2_transport *t,
   gpr_ref_init(&t->refs, 2);
   gpr_mu_init(&t->mu);
   grpc_mdctx_ref(mdctx);
+  t->peer_string = grpc_endpoint_get_peer(ep);
   t->metadata_context = mdctx;
   t->endpoint_reading = 1;
   t->global.next_stream_id = is_client ? 1 : 2;
@@ -228,12 +237,12 @@ static void init_transport(grpc_chttp2_transport *t,
   t->global.pings.next = t->global.pings.prev = &t->global.pings;
   t->parsing.is_client = is_client;
   t->parsing.str_grpc_timeout =
-      grpc_mdstr_from_string(t->metadata_context, "grpc-timeout");
+      grpc_mdstr_from_string(t->metadata_context, "grpc-timeout", 0);
   t->parsing.deframe_state =
       is_client ? GRPC_DTS_FH_0 : GRPC_DTS_CLIENT_PREFIX_0;
   t->writing.is_client = is_client;
   grpc_connectivity_state_init(&t->channel_callback.state_tracker,
-                               GRPC_CHANNEL_READY);
+                               GRPC_CHANNEL_READY, "transport");
 
   gpr_slice_buffer_init(&t->global.qbuf);
 
@@ -327,7 +336,8 @@ static void destroy_transport(grpc_transport *gt) {
 static void close_transport_locked(grpc_chttp2_transport *t) {
   if (!t->closed) {
     t->closed = 1;
-    connectivity_state_set(&t->global, GRPC_CHANNEL_FATAL_FAILURE);
+    connectivity_state_set(&t->global, GRPC_CHANNEL_FATAL_FAILURE,
+                           "close_transport");
     if (t->ep) {
       grpc_endpoint_shutdown(t->ep);
     }
@@ -393,12 +403,16 @@ static void destroy_stream(grpc_transport *gt, grpc_stream *gs) {
   }
 
   grpc_chttp2_list_remove_incoming_window_updated(&t->global, &s->global);
-  grpc_chttp2_list_remove_writable_window_update_stream(&t->global, &s->global);
+  grpc_chttp2_list_remove_writable_stream(&t->global, &s->global);
 
   gpr_mu_unlock(&t->mu);
 
   for (i = 0; i < STREAM_LIST_COUNT; i++) {
-    GPR_ASSERT(!s->included[i]);
+    if (s->included[i]) {
+      gpr_log(GPR_ERROR, "%s stream %d still included in list %d",
+              t->global.is_client ? "client" : "server", s->global.id, i);
+      abort();
+    }
   }
 
   GPR_ASSERT(s->global.outgoing_sopb == NULL);
@@ -530,7 +544,8 @@ void grpc_chttp2_add_incoming_goaway(
   gpr_free(msg);
   gpr_slice_unref(goaway_text);
   transport_global->seen_goaway = 1;
-  connectivity_state_set(transport_global, GRPC_CHANNEL_FATAL_FAILURE);
+  connectivity_state_set(transport_global, GRPC_CHANNEL_FATAL_FAILURE,
+                         "got_goaway");
 }
 
 static void maybe_start_some_streams(
@@ -555,7 +570,8 @@ static void maybe_start_some_streams(
     transport_global->next_stream_id += 2;
 
     if (transport_global->next_stream_id >= MAX_CLIENT_STREAM_ID) {
-      connectivity_state_set(transport_global, GRPC_CHANNEL_TRANSIENT_FAILURE);
+      connectivity_state_set(transport_global, GRPC_CHANNEL_TRANSIENT_FAILURE,
+                             "no_more_stream_ids");
     }
 
     stream_global->outgoing_window =
@@ -574,8 +590,6 @@ static void maybe_start_some_streams(
     grpc_chttp2_list_add_incoming_window_updated(transport_global,
                                                  stream_global);
     grpc_chttp2_list_add_writable_stream(transport_global, stream_global);
-    grpc_chttp2_list_add_writable_window_update_stream(transport_global,
-                                                       stream_global);
 
   }
   /* cancel out streams that will never be started */
@@ -593,10 +607,16 @@ static void perform_stream_op_locked(
     cancel_from_api(transport_global, stream_global, op->cancel_with_status);
   }
 
+  if (op->close_with_status != GRPC_STATUS_OK) {
+    close_from_api(transport_global, stream_global, op->close_with_status,
+                   op->optional_close_message);
+  }
+
   if (op->send_ops) {
     GPR_ASSERT(stream_global->outgoing_sopb == NULL);
     stream_global->send_done_closure = op->on_done_send;
     if (!stream_global->cancelled) {
+      stream_global->written_anything = 1;
       stream_global->outgoing_sopb = op->send_ops;
       if (op->is_last_send &&
           stream_global->write_state == GRPC_WRITE_STATE_OPEN) {
@@ -641,8 +661,7 @@ static void perform_stream_op_locked(
     if (stream_global->id != 0) {
       grpc_chttp2_list_add_read_write_state_changed(transport_global,
                                                     stream_global);
-      grpc_chttp2_list_add_writable_window_update_stream(transport_global,
-                                                         stream_global);
+      grpc_chttp2_list_add_writable_stream(transport_global, stream_global);
     }
   }
 
@@ -686,6 +705,7 @@ static void send_ping_locked(grpc_chttp2_transport *t,
 
 static void perform_transport_op(grpc_transport *gt, grpc_transport_op *op) {
   grpc_chttp2_transport *t = (grpc_chttp2_transport *)gt;
+  int close_transport = 0;
 
   lock(t);
 
@@ -705,9 +725,7 @@ static void perform_transport_op(grpc_transport *gt, grpc_transport_op *op) {
         t->global.last_incoming_stream_id,
         grpc_chttp2_grpc_status_to_http2_error(op->goaway_status),
         gpr_slice_ref(*op->goaway_message), &t->global.qbuf);
-    if (!grpc_chttp2_has_streams(t)) {
-      close_transport_locked(t);
-    }
+    close_transport = !grpc_chttp2_has_streams(t);
   }
 
   if (op->set_accept_stream != NULL) {
@@ -720,6 +738,10 @@ static void perform_transport_op(grpc_transport *gt, grpc_transport_op *op) {
     add_to_pollset_locked(t, op->bind_pollset);
   }
 
+  if (op->bind_pollset_set) {
+    add_to_pollset_set_locked(t, op->bind_pollset_set);
+  }
+
   if (op->send_ping) {
     send_ping_locked(t, op->send_ping);
   }
@@ -729,6 +751,12 @@ static void perform_transport_op(grpc_transport *gt, grpc_transport_op *op) {
   }
 
   unlock(t);
+
+  if (close_transport) {
+    lock(t);
+    close_transport_locked(t);
+    unlock(t);
+  }
 }
 
 /*
@@ -750,6 +778,7 @@ static void remove_stream(grpc_chttp2_transport *t, gpr_uint32 id) {
   if (!s) {
     s = grpc_chttp2_stream_map_delete(&t->new_stream_map, id);
   }
+  grpc_chttp2_list_remove_writable_stream(&t->global, &s->global);
   GPR_ASSERT(s);
   s->global.in_stream_map = 0;
   if (t->parsing.incoming_stream == &s->parsing) {
@@ -805,6 +834,12 @@ static void unlock_check_read_write_state(grpc_chttp2_transport *t) {
                                                            stream_global);
       } else {
         stream_global->write_state = GRPC_WRITE_STATE_SENT_CLOSE;
+        if (stream_global->outgoing_sopb != NULL) {
+          grpc_sopb_reset(stream_global->outgoing_sopb);
+          stream_global->outgoing_sopb = NULL;
+          grpc_chttp2_schedule_closure(transport_global,
+                                       stream_global->send_done_closure, 1);
+        }
         stream_global->read_closed = 1;
         if (!stream_global->published_cancelled) {
           char buffer[GPR_LTOA_MIN_BUFSIZE];
@@ -831,6 +866,9 @@ static void unlock_check_read_write_state(grpc_chttp2_transport *t) {
     if (!stream_global->publish_sopb) {
       continue;
     }
+    if (stream_global->writing_now != 0) {
+      continue;
+    }
     /* FIXME(ctiller): we include in_stream_map in our computation of
        whether the stream is write-closed. This is completely bogus,
        but has the effect of delaying stream-closed until the stream
@@ -873,6 +911,108 @@ static void cancel_from_api(grpc_chttp2_transport_global *transport_global,
                                                 stream_global);
 }
 
+static void close_from_api(grpc_chttp2_transport_global *transport_global,
+                           grpc_chttp2_stream_global *stream_global,
+                           grpc_status_code status,
+                           gpr_slice *optional_message) {
+  gpr_slice hdr;
+  gpr_slice status_hdr;
+  gpr_slice message_pfx;
+  gpr_uint8 *p;
+  gpr_uint32 len = 0;
+
+  GPR_ASSERT(status >= 0 && (int)status < 100);
+
+  stream_global->cancelled = 1;
+  stream_global->cancelled_status = status;
+  GPR_ASSERT(stream_global->id != 0);
+  GPR_ASSERT(!stream_global->written_anything);
+
+  /* Hand roll a header block.
+     This is unnecessarily ugly - at some point we should find a more elegant
+     solution.
+     It's complicated by the fact that our send machinery would be dead by the
+     time we got around to sending this, so instead we ignore HPACK compression
+     and just write the uncompressed bytes onto the wire. */
+  status_hdr = gpr_slice_malloc(15 + (status >= 10));
+  p = GPR_SLICE_START_PTR(status_hdr);
+  *p++ = 0x40; /* literal header */
+  *p++ = 11;   /* len(grpc-status) */
+  *p++ = 'g';
+  *p++ = 'r';
+  *p++ = 'p';
+  *p++ = 'c';
+  *p++ = '-';
+  *p++ = 's';
+  *p++ = 't';
+  *p++ = 'a';
+  *p++ = 't';
+  *p++ = 'u';
+  *p++ = 's';
+  if (status < 10) {
+    *p++ = 1;
+    *p++ = '0' + status;
+  } else {
+    *p++ = 2;
+    *p++ = '0' + (status / 10);
+    *p++ = '0' + (status % 10);
+  }
+  GPR_ASSERT(p == GPR_SLICE_END_PTR(status_hdr));
+  len += GPR_SLICE_LENGTH(status_hdr);
+
+  if (optional_message) {
+    GPR_ASSERT(GPR_SLICE_LENGTH(*optional_message) < 127);
+    message_pfx = gpr_slice_malloc(15);
+    p = GPR_SLICE_START_PTR(message_pfx);
+    *p++ = 0x40;
+    *p++ = 12; /* len(grpc-message) */
+    *p++ = 'g';
+    *p++ = 'r';
+    *p++ = 'p';
+    *p++ = 'c';
+    *p++ = '-';
+    *p++ = 'm';
+    *p++ = 'e';
+    *p++ = 's';
+    *p++ = 's';
+    *p++ = 'a';
+    *p++ = 'g';
+    *p++ = 'e';
+    *p++ = GPR_SLICE_LENGTH(*optional_message);
+    GPR_ASSERT(p == GPR_SLICE_END_PTR(message_pfx));
+    len += GPR_SLICE_LENGTH(message_pfx);
+    len += GPR_SLICE_LENGTH(*optional_message);
+  }
+
+  hdr = gpr_slice_malloc(9);
+  p = GPR_SLICE_START_PTR(hdr);
+  *p++ = len >> 16;
+  *p++ = len >> 8;
+  *p++ = len;
+  *p++ = GRPC_CHTTP2_FRAME_HEADER;
+  *p++ = GRPC_CHTTP2_DATA_FLAG_END_STREAM | GRPC_CHTTP2_DATA_FLAG_END_HEADERS;
+  *p++ = stream_global->id >> 24;
+  *p++ = stream_global->id >> 16;
+  *p++ = stream_global->id >> 8;
+  *p++ = stream_global->id;
+  GPR_ASSERT(p == GPR_SLICE_END_PTR(hdr));
+
+  gpr_slice_buffer_add(&transport_global->qbuf, hdr);
+  gpr_slice_buffer_add(&transport_global->qbuf, status_hdr);
+  if (optional_message) {
+    gpr_slice_buffer_add(&transport_global->qbuf, message_pfx);
+    gpr_slice_buffer_add(&transport_global->qbuf,
+                         gpr_slice_ref(*optional_message));
+  }
+
+  gpr_slice_buffer_add(
+      &transport_global->qbuf,
+      grpc_chttp2_rst_stream_create(stream_global->id, GRPC_CHTTP2_NO_ERROR));
+
+  grpc_chttp2_list_add_read_write_state_changed(transport_global,
+                                                stream_global);
+}
+
 static void cancel_stream_cb(grpc_chttp2_transport_global *transport_global,
                              void *user_data,
                              grpc_chttp2_stream_global *stream_global) {
@@ -1001,12 +1141,12 @@ static void schedule_closure_for_connectivity(void *a,
 
 static void connectivity_state_set(
     grpc_chttp2_transport_global *transport_global,
-    grpc_connectivity_state state) {
+    grpc_connectivity_state state, const char *reason) {
   GRPC_CHTTP2_IF_TRACING(
       gpr_log(GPR_DEBUG, "set connectivity_state=%d", state));
   grpc_connectivity_state_set_with_scheduler(
       &TRANSPORT_FROM_GLOBAL(transport_global)->channel_callback.state_tracker,
-      state, schedule_closure_for_connectivity, transport_global);
+      state, schedule_closure_for_connectivity, transport_global, reason);
 }
 
 void grpc_chttp2_schedule_closure(
@@ -1034,6 +1174,13 @@ static void add_to_pollset_locked(grpc_chttp2_transport *t,
   }
 }
 
+static void add_to_pollset_set_locked(grpc_chttp2_transport *t,
+                                  grpc_pollset_set *pollset_set) {
+  if (t->ep) {
+    grpc_endpoint_add_to_pollset_set(t->ep, pollset_set);
+  }
+}
+
 /*
  * TRACING
  */
@@ -1069,9 +1216,17 @@ void grpc_chttp2_flowctl_trace(const char *file, int line, const char *reason,
  * INTEGRATION GLUE
  */
 
-static const grpc_transport_vtable vtable = {
-    sizeof(grpc_chttp2_stream), init_stream,    perform_stream_op,
-    perform_transport_op,       destroy_stream, destroy_transport};
+static char *chttp2_get_peer(grpc_transport *t) {
+  return gpr_strdup(((grpc_chttp2_transport *)t)->peer_string);
+}
+
+static const grpc_transport_vtable vtable = {sizeof(grpc_chttp2_stream),
+                                             init_stream,
+                                             perform_stream_op,
+                                             perform_transport_op,
+                                             destroy_stream,
+                                             destroy_transport,
+                                             chttp2_get_peer};
 
 grpc_transport *grpc_create_chttp2_transport(
     const grpc_channel_args *channel_args, grpc_endpoint *ep, grpc_mdctx *mdctx,
diff --git a/src/core/transport/connectivity_state.c b/src/core/transport/connectivity_state.c
index 1091ceae44..61d26f06f0 100644
--- a/src/core/transport/connectivity_state.c
+++ b/src/core/transport/connectivity_state.c
@@ -34,11 +34,33 @@
 #include "src/core/transport/connectivity_state.h"
 #include <grpc/support/alloc.h>
 #include <grpc/support/log.h>
+#include <grpc/support/string_util.h>
+
+int grpc_connectivity_state_trace = 0;
+
+const char *grpc_connectivity_state_name(grpc_connectivity_state state) {
+  switch (state) {
+    case GRPC_CHANNEL_IDLE:
+      return "IDLE";
+    case GRPC_CHANNEL_CONNECTING:
+      return "CONNECTING";
+    case GRPC_CHANNEL_READY:
+      return "READY";
+    case GRPC_CHANNEL_TRANSIENT_FAILURE:
+      return "TRANSIENT_FAILURE";
+    case GRPC_CHANNEL_FATAL_FAILURE:
+      return "FATAL_FAILURE";
+  }
+  abort();
+  return "UNKNOWN";
+}
 
 void grpc_connectivity_state_init(grpc_connectivity_state_tracker *tracker,
-                                  grpc_connectivity_state init_state) {
+                                  grpc_connectivity_state init_state,
+                                  const char *name) {
   tracker->current_state = init_state;
   tracker->watchers = NULL;
+  tracker->name = gpr_strdup(name);
 }
 
 void grpc_connectivity_state_destroy(grpc_connectivity_state_tracker *tracker) {
@@ -54,6 +76,7 @@ void grpc_connectivity_state_destroy(grpc_connectivity_state_tracker *tracker) {
     }
     gpr_free(w);
   }
+  gpr_free(tracker->name);
 }
 
 grpc_connectivity_state grpc_connectivity_state_check(
@@ -64,6 +87,11 @@ grpc_connectivity_state grpc_connectivity_state_check(
 int grpc_connectivity_state_notify_on_state_change(
     grpc_connectivity_state_tracker *tracker, grpc_connectivity_state *current,
     grpc_iomgr_closure *notify) {
+  if (grpc_connectivity_state_trace) {
+    gpr_log(GPR_DEBUG, "CONWATCH: %s: from %s [cur=%s]", tracker->name,
+            grpc_connectivity_state_name(*current),
+            grpc_connectivity_state_name(tracker->current_state));
+  }
   if (tracker->current_state != *current) {
     *current = tracker->current_state;
     grpc_iomgr_add_callback(notify);
@@ -79,12 +107,19 @@ int grpc_connectivity_state_notify_on_state_change(
 
 void grpc_connectivity_state_set_with_scheduler(
     grpc_connectivity_state_tracker *tracker, grpc_connectivity_state state,
-    void (*scheduler)(void *arg, grpc_iomgr_closure *closure), void *arg) {
+    void (*scheduler)(void *arg, grpc_iomgr_closure *closure), void *arg,
+    const char *reason) {
   grpc_connectivity_state_watcher *new = NULL;
   grpc_connectivity_state_watcher *w;
+  if (grpc_connectivity_state_trace) {
+    gpr_log(GPR_DEBUG, "SET: %s: %s --> %s [%s]", tracker->name,
+            grpc_connectivity_state_name(tracker->current_state),
+            grpc_connectivity_state_name(state), reason);
+  }
   if (tracker->current_state == state) {
     return;
   }
+  GPR_ASSERT(tracker->current_state != GRPC_CHANNEL_FATAL_FAILURE);
   tracker->current_state = state;
   while ((w = tracker->watchers)) {
     tracker->watchers = w->next;
@@ -106,7 +141,8 @@ static void default_scheduler(void *ignored, grpc_iomgr_closure *closure) {
 }
 
 void grpc_connectivity_state_set(grpc_connectivity_state_tracker *tracker,
-                                 grpc_connectivity_state state) {
+                                 grpc_connectivity_state state,
+                                 const char *reason) {
   grpc_connectivity_state_set_with_scheduler(tracker, state, default_scheduler,
-                                             NULL);
+                                             NULL, reason);
 }
diff --git a/src/core/transport/connectivity_state.h b/src/core/transport/connectivity_state.h
index bbdcbcb069..a3b0b80c98 100644
--- a/src/core/transport/connectivity_state.h
+++ b/src/core/transport/connectivity_state.h
@@ -51,17 +51,24 @@ typedef struct {
   grpc_connectivity_state current_state;
   /** all our watchers */
   grpc_connectivity_state_watcher *watchers;
+  /** a name to help debugging */
+  char *name;
 } grpc_connectivity_state_tracker;
 
+extern int grpc_connectivity_state_trace;
+
 void grpc_connectivity_state_init(grpc_connectivity_state_tracker *tracker,
-                                  grpc_connectivity_state init_state);
+                                  grpc_connectivity_state init_state,
+                                  const char *name);
 void grpc_connectivity_state_destroy(grpc_connectivity_state_tracker *tracker);
 
 void grpc_connectivity_state_set(grpc_connectivity_state_tracker *tracker,
-                                 grpc_connectivity_state state);
+                                 grpc_connectivity_state state,
+                                 const char *reason);
 void grpc_connectivity_state_set_with_scheduler(
     grpc_connectivity_state_tracker *tracker, grpc_connectivity_state state,
-    void (*scheduler)(void *arg, grpc_iomgr_closure *closure), void *arg);
+    void (*scheduler)(void *arg, grpc_iomgr_closure *closure), void *arg,
+    const char *reason);
 
 grpc_connectivity_state grpc_connectivity_state_check(
     grpc_connectivity_state_tracker *tracker);
diff --git a/src/core/transport/metadata.c b/src/core/transport/metadata.c
index e95b7a21f9..44d32b6cb2 100644
--- a/src/core/transport/metadata.c
+++ b/src/core/transport/metadata.c
@@ -135,7 +135,9 @@ static void unlock(grpc_mdctx *ctx) {
   if (ctx->refs == 0) {
     /* uncomment if you're having trouble diagnosing an mdelem leak to make
        things clearer (slows down destruction a lot, however) */
+#ifdef GRPC_METADATA_REFCOUNT_DEBUG
     gc_mdtab(ctx);
+#endif
     if (ctx->mdtab_count && ctx->mdtab_count == ctx->mdtab_free) {
       discard_metadata(ctx);
     }
@@ -309,7 +311,37 @@ static void slice_unref(void *p) {
   unlock(ctx);
 }
 
-grpc_mdstr *grpc_mdstr_from_string(grpc_mdctx *ctx, const char *str) {
+grpc_mdstr *grpc_mdstr_from_string(grpc_mdctx *ctx, const char *str, int canonicalize_key) {
+  if (canonicalize_key) {
+    size_t len;
+    size_t i;
+    int canonical = 1;
+
+    for (i = 0; str[i]; i++) {
+      if (str[i] >= 'A' && str[i] <= 'Z') {
+        canonical = 0;
+        /* Keep going in loop just to get string length */
+      }
+    }
+    len = i;
+
+    if (canonical) {
+      return grpc_mdstr_from_buffer(ctx, (const gpr_uint8 *)str, len);
+    } else {
+      char *copy = gpr_malloc(len);
+      grpc_mdstr *ret;
+      for (i = 0; i < len; i++) {
+        if (str[i] >= 'A' && str[i] <= 'Z') {
+          copy[i] = str[i] - 'A' + 'a';
+        } else {
+          copy[i] = str[i];
+        }
+      }
+      ret = grpc_mdstr_from_buffer(ctx, (const gpr_uint8 *)copy, len);
+      gpr_free(copy);
+      return ret;
+    }
+  }
   return grpc_mdstr_from_buffer(ctx, (const gpr_uint8 *)str, strlen(str));
 }
 
@@ -491,8 +523,8 @@ grpc_mdelem *grpc_mdelem_from_metadata_strings(grpc_mdctx *ctx,
 grpc_mdelem *grpc_mdelem_from_strings(grpc_mdctx *ctx, const char *key,
                                       const char *value) {
   return grpc_mdelem_from_metadata_strings(ctx,
-                                           grpc_mdstr_from_string(ctx, key),
-                                           grpc_mdstr_from_string(ctx, value));
+                                           grpc_mdstr_from_string(ctx, key, 0),
+                                           grpc_mdstr_from_string(ctx, value, 0));
 }
 
 grpc_mdelem *grpc_mdelem_from_slices(grpc_mdctx *ctx, gpr_slice key,
@@ -504,9 +536,10 @@ grpc_mdelem *grpc_mdelem_from_slices(grpc_mdctx *ctx, gpr_slice key,
 grpc_mdelem *grpc_mdelem_from_string_and_buffer(grpc_mdctx *ctx,
                                                 const char *key,
                                                 const gpr_uint8 *value,
-                                                size_t value_length) {
+                                                size_t value_length,
+                                                int canonicalize_key) {
   return grpc_mdelem_from_metadata_strings(
-      ctx, grpc_mdstr_from_string(ctx, key),
+      ctx, grpc_mdstr_from_string(ctx, key, canonicalize_key),
       grpc_mdstr_from_buffer(ctx, value, value_length));
 }
 
diff --git a/src/core/transport/metadata.h b/src/core/transport/metadata.h
index 99b15322c3..15ef9bb555 100644
--- a/src/core/transport/metadata.h
+++ b/src/core/transport/metadata.h
@@ -95,7 +95,7 @@ size_t grpc_mdctx_get_mdtab_free_test_only(grpc_mdctx *mdctx);
 
 /* Constructors for grpc_mdstr instances; take a variety of data types that
    clients may have handy */
-grpc_mdstr *grpc_mdstr_from_string(grpc_mdctx *ctx, const char *str);
+grpc_mdstr *grpc_mdstr_from_string(grpc_mdctx *ctx, const char *str, int perform_key_canonicalization);
 /* Unrefs the slice. */
 grpc_mdstr *grpc_mdstr_from_slice(grpc_mdctx *ctx, gpr_slice slice);
 grpc_mdstr *grpc_mdstr_from_buffer(grpc_mdctx *ctx, const gpr_uint8 *str,
@@ -117,7 +117,8 @@ grpc_mdelem *grpc_mdelem_from_slices(grpc_mdctx *ctx, gpr_slice key,
 grpc_mdelem *grpc_mdelem_from_string_and_buffer(grpc_mdctx *ctx,
                                                 const char *key,
                                                 const gpr_uint8 *value,
-                                                size_t value_length);
+                                                size_t value_length,
+                                                int canonicalize_key);
 
 /* Mutator and accessor for grpc_mdelem user data. The destructor function
    is used as a type tag and is checked during user_data fetch. */
diff --git a/src/core/transport/stream_op.h b/src/core/transport/stream_op.h
index f27ef1b66b..227320cf2a 100644
--- a/src/core/transport/stream_op.h
+++ b/src/core/transport/stream_op.h
@@ -108,7 +108,7 @@ void grpc_metadata_batch_move(grpc_metadata_batch *dst,
                               grpc_metadata_batch *src);
 
 /** Add \a storage to the beginning of \a batch. storage->md is
-    assumed to be valid. 
+    assumed to be valid.
     \a storage is owned by the caller and must survive for the
     lifetime of batch. This usually means it should be around
     for the lifetime of the call. */
diff --git a/src/core/transport/transport.c b/src/core/transport/transport.c
index 2689e3028a..c0d92cf93f 100644
--- a/src/core/transport/transport.c
+++ b/src/core/transport/transport.c
@@ -32,6 +32,8 @@
  */
 
 #include "src/core/transport/transport.h"
+#include <grpc/support/alloc.h>
+#include <grpc/support/log.h>
 #include "src/core/transport/transport_impl.h"
 
 size_t grpc_transport_stream_size(grpc_transport *transport) {
@@ -65,6 +67,10 @@ void grpc_transport_destroy_stream(grpc_transport *transport,
   transport->vtable->destroy_stream(transport, stream);
 }
 
+char *grpc_transport_get_peer(grpc_transport *transport) {
+  return transport->vtable->get_peer(transport);
+}
+
 void grpc_transport_stream_op_finish_with_failure(
     grpc_transport_stream_op *op) {
   if (op->send_ops) {
@@ -79,12 +85,54 @@ void grpc_transport_stream_op_finish_with_failure(
 }
 
 void grpc_transport_stream_op_add_cancellation(grpc_transport_stream_op *op,
-                                               grpc_status_code status,
-                                               grpc_mdstr *message) {
+                                               grpc_status_code status) {
+  GPR_ASSERT(status != GRPC_STATUS_OK);
   if (op->cancel_with_status == GRPC_STATUS_OK) {
     op->cancel_with_status = status;
   }
-  if (message) {
-    GRPC_MDSTR_UNREF(message);
+  if (op->close_with_status != GRPC_STATUS_OK) {
+    op->close_with_status = GRPC_STATUS_OK;
+    if (op->optional_close_message != NULL) {
+      gpr_slice_unref(*op->optional_close_message);
+      op->optional_close_message = NULL;
+    }
+  }
+}
+
+typedef struct {
+  gpr_slice message;
+  grpc_iomgr_closure *then_call;
+  grpc_iomgr_closure closure;
+} close_message_data;
+
+static void free_message(void *p, int iomgr_success) {
+  close_message_data *cmd = p;
+  gpr_slice_unref(cmd->message);
+  if (cmd->then_call != NULL) {
+    cmd->then_call->cb(cmd->then_call->cb_arg, iomgr_success);
+  }
+  gpr_free(cmd);
+}
+
+void grpc_transport_stream_op_add_close(grpc_transport_stream_op *op,
+                                        grpc_status_code status,
+                                        gpr_slice *optional_message) {
+  close_message_data *cmd;
+  GPR_ASSERT(status != GRPC_STATUS_OK);
+  if (op->cancel_with_status != GRPC_STATUS_OK ||
+      op->close_with_status != GRPC_STATUS_OK) {
+    if (optional_message) {
+      gpr_slice_unref(*optional_message);
+    }
+    return;
+  }
+  if (optional_message) {
+    cmd = gpr_malloc(sizeof(*cmd));
+    cmd->message = *optional_message;
+    cmd->then_call = op->on_consumed;
+    grpc_iomgr_closure_init(&cmd->closure, free_message, cmd);
+    op->on_consumed = &cmd->closure;
+    op->optional_close_message = &cmd->message;
   }
+  op->close_with_status = status;
 }
diff --git a/src/core/transport/transport.h b/src/core/transport/transport.h
index 64503604ee..92c1f38c5e 100644
--- a/src/core/transport/transport.h
+++ b/src/core/transport/transport.h
@@ -80,8 +80,14 @@ typedef struct grpc_transport_stream_op {
 
   grpc_pollset *bind_pollset;
 
+  /** If != GRPC_STATUS_OK, cancel this stream */
   grpc_status_code cancel_with_status;
 
+  /** If != GRPC_STATUS_OK, send grpc-status, grpc-message, and close this
+      stream for both reading and writing */
+  grpc_status_code close_with_status;
+  gpr_slice *optional_close_message;
+
   /* Indexes correspond to grpc_context_index enum values */
   grpc_call_context_element *context;
 } grpc_transport_stream_op;
@@ -109,6 +115,8 @@ typedef struct grpc_transport_op {
   void *set_accept_stream_user_data;
   /** add this transport to a pollset */
   grpc_pollset *bind_pollset;
+  /** add this transport to a pollset_set */
+  grpc_pollset_set *bind_pollset_set;
   /** send a ping, call this back if not NULL */
   grpc_iomgr_closure *send_ping;
 } grpc_transport_op;
@@ -146,8 +154,11 @@ void grpc_transport_destroy_stream(grpc_transport *transport,
 void grpc_transport_stream_op_finish_with_failure(grpc_transport_stream_op *op);
 
 void grpc_transport_stream_op_add_cancellation(grpc_transport_stream_op *op,
-                                               grpc_status_code status,
-                                               grpc_mdstr *message);
+                                               grpc_status_code status);
+
+void grpc_transport_stream_op_add_close(grpc_transport_stream_op *op,
+                                        grpc_status_code status,
+                                        gpr_slice *optional_message);
 
 char *grpc_transport_stream_op_string(grpc_transport_stream_op *op);
 
@@ -182,4 +193,7 @@ void grpc_transport_close(grpc_transport *transport);
 /* Destroy the transport */
 void grpc_transport_destroy(grpc_transport *transport);
 
+/* Get the transports peer */
+char *grpc_transport_get_peer(grpc_transport *transport);
+
 #endif /* GRPC_INTERNAL_CORE_TRANSPORT_TRANSPORT_H */
diff --git a/src/core/transport/transport_impl.h b/src/core/transport/transport_impl.h
index 515721dfb6..d3bbdf6c27 100644
--- a/src/core/transport/transport_impl.h
+++ b/src/core/transport/transport_impl.h
@@ -58,6 +58,9 @@ typedef struct grpc_transport_vtable {
 
   /* implementation of grpc_transport_destroy */
   void (*destroy)(grpc_transport *self);
+
+  /* implementation of grpc_transport_get_peer */
+  char *(*get_peer)(grpc_transport *self);
 } grpc_transport_vtable;
 
 /* an instance of a grpc transport */
diff --git a/src/core/transport/transport_op_string.c b/src/core/transport/transport_op_string.c
index 10d796fc15..f62c340e97 100644
--- a/src/core/transport/transport_op_string.c
+++ b/src/core/transport/transport_op_string.c
@@ -116,10 +116,9 @@ char *grpc_transport_stream_op_string(grpc_transport_stream_op *op) {
   if (op->send_ops) {
     if (!first) gpr_strvec_add(&b, gpr_strdup(" "));
     first = 0;
-    gpr_strvec_add(&b, gpr_strdup("SEND"));
-    if (op->is_last_send) {
-      gpr_strvec_add(&b, gpr_strdup("_LAST"));
-    }
+    gpr_asprintf(&tmp, "SEND%s:%p", op->is_last_send ? "_LAST" : "",
+                 op->on_done_send);
+    gpr_strvec_add(&b, tmp);
     gpr_strvec_add(&b, gpr_strdup("["));
     gpr_strvec_add(&b, grpc_sopb_string(op->send_ops));
     gpr_strvec_add(&b, gpr_strdup("]"));
@@ -128,7 +127,8 @@ char *grpc_transport_stream_op_string(grpc_transport_stream_op *op) {
   if (op->recv_ops) {
     if (!first) gpr_strvec_add(&b, gpr_strdup(" "));
     first = 0;
-    gpr_asprintf(&tmp, "RECV:max_recv_bytes=%d", op->max_recv_bytes);
+    gpr_asprintf(&tmp, "RECV:%p:max_recv_bytes=%d", op->on_done_recv,
+                 op->max_recv_bytes);
     gpr_strvec_add(&b, tmp);
   }
 
diff --git a/src/core/tsi/ssl_transport_security.c b/src/core/tsi/ssl_transport_security.c
index 6156a39d09..609fc06ed5 100644
--- a/src/core/tsi/ssl_transport_security.c
+++ b/src/core/tsi/ssl_transport_security.c
@@ -1293,8 +1293,8 @@ tsi_result tsi_create_ssl_server_handshaker_factory(
     const size_t* pem_private_keys_sizes, const unsigned char** pem_cert_chains,
     const size_t* pem_cert_chains_sizes, size_t key_cert_pair_count,
     const unsigned char* pem_client_root_certs,
-    size_t pem_client_root_certs_size, const char* cipher_list,
-    const unsigned char** alpn_protocols,
+    size_t pem_client_root_certs_size, int force_client_auth,
+    const char* cipher_list, const unsigned char** alpn_protocols,
     const unsigned char* alpn_protocols_lengths, uint16_t num_alpn_protocols,
     tsi_ssl_handshaker_factory** factory) {
   tsi_ssl_server_handshaker_factory* impl = NULL;
@@ -1349,6 +1349,7 @@ tsi_result tsi_create_ssl_server_handshaker_factory(
       if (result != TSI_OK) break;
 
       if (pem_client_root_certs != NULL) {
+        int flags = SSL_VERIFY_PEER;
         STACK_OF(X509_NAME)* root_names = NULL;
         result = ssl_ctx_load_verification_certs(
             impl->ssl_contexts[i], pem_client_root_certs,
@@ -1358,7 +1359,8 @@ tsi_result tsi_create_ssl_server_handshaker_factory(
           break;
         }
         SSL_CTX_set_client_CA_list(impl->ssl_contexts[i], root_names);
-        SSL_CTX_set_verify(impl->ssl_contexts[i], SSL_VERIFY_PEER, NULL);
+        if (force_client_auth) flags |= SSL_VERIFY_FAIL_IF_NO_PEER_CERT;
+        SSL_CTX_set_verify(impl->ssl_contexts[i], flags, NULL);
         /* TODO(jboeuf): Add revocation verification. */
       }
 
diff --git a/src/core/tsi/ssl_transport_security.h b/src/core/tsi/ssl_transport_security.h
index b2aa2f393e..4bf6c81b75 100644
--- a/src/core/tsi/ssl_transport_security.h
+++ b/src/core/tsi/ssl_transport_security.h
@@ -107,10 +107,14 @@ tsi_result tsi_create_ssl_client_handshaker_factory(
    - key_cert_pair_count indicates the number of items in the private_key_files
      and cert_chain_files parameters.
    - pem_client_roots is the buffer containing the PEM encoding of the client
-     root certificates. This parameter may be NULL in which case the server
-     will not ask the client to authenticate itself with a certificate (server-
-     only authentication mode).
-   - pem_client_roots_size is the size of the associated buffer.
+     root certificates. This parameter may be NULL in which case the server will
+     not authenticate the client. If not NULL, the force_client_auth parameter
+     specifies if the server will accept only authenticated clients or both
+     authenticated and non-authenticated clients.
+   - pem_client_root_certs_size is the size of the associated buffer.
+   - force_client_auth, if set to non-zero will force the client to authenticate
+     with an SSL cert. Note that this option is ignored if pem_client_root_certs
+     is NULL or pem_client_roots_certs_size is 0
    - cipher_suites contains an optional list of the ciphers that the server
      supports. The format of this string is described in:
      https://www.openssl.org/docs/apps/ciphers.html.
@@ -131,8 +135,8 @@ tsi_result tsi_create_ssl_server_handshaker_factory(
     const size_t* pem_private_keys_sizes, const unsigned char** pem_cert_chains,
     const size_t* pem_cert_chains_sizes, size_t key_cert_pair_count,
     const unsigned char* pem_client_root_certs,
-    size_t pem_client_root_certs_size, const char* cipher_suites,
-    const unsigned char** alpn_protocols,
+    size_t pem_client_root_certs_size, int force_client_auth,
+    const char* cipher_suites, const unsigned char** alpn_protocols,
     const unsigned char* alpn_protocols_lengths, uint16_t num_alpn_protocols,
     tsi_ssl_handshaker_factory** factory);
 
diff --git a/src/cpp/client/channel.cc b/src/cpp/client/channel.cc
index da31d000b3..af7366eb01 100644
--- a/src/cpp/client/channel.cc
+++ b/src/cpp/client/channel.cc
@@ -39,7 +39,6 @@
 #include <grpc/support/log.h>
 #include <grpc/support/slice.h>
 
-#include "src/core/census/grpc_context.h"
 #include "src/core/profiling/timers.h"
 #include <grpc++/channel_arguments.h>
 #include <grpc++/client_context.h>
@@ -49,27 +48,33 @@
 #include <grpc++/impl/call.h>
 #include <grpc++/impl/rpc_method.h>
 #include <grpc++/status.h>
+#include <grpc++/time.h>
 
 namespace grpc {
 
-Channel::Channel(const grpc::string& target, grpc_channel* channel)
-    : target_(target), c_channel_(channel) {}
+Channel::Channel(grpc_channel* channel) : c_channel_(channel) {}
+
+Channel::Channel(const grpc::string& host, grpc_channel* channel)
+    : host_(host), c_channel_(channel) {}
 
 Channel::~Channel() { grpc_channel_destroy(c_channel_); }
 
 Call Channel::CreateCall(const RpcMethod& method, ClientContext* context,
                          CompletionQueue* cq) {
-  auto c_call =
-      method.channel_tag() && context->authority().empty()
-          ? grpc_channel_create_registered_call(c_channel_, cq->cq(),
-                                                method.channel_tag(),
-                                                context->raw_deadline())
-          : grpc_channel_create_call(c_channel_, cq->cq(), method.name(),
-                                     context->authority().empty()
-                                         ? target_.c_str()
-                                         : context->authority().c_str(),
-                                     context->raw_deadline());
-  grpc_census_call_set_context(c_call, context->get_census_context());
+  const char* host_str = host_.empty() ? NULL : host_.c_str();
+  auto c_call = method.channel_tag() && context->authority().empty()
+                    ? grpc_channel_create_registered_call(
+                          c_channel_, context->propagate_from_call_,
+                          context->propagation_options_.c_bitmask(), cq->cq(),
+                          method.channel_tag(), context->raw_deadline())
+                    : grpc_channel_create_call(
+                          c_channel_, context->propagate_from_call_,
+                          context->propagation_options_.c_bitmask(), cq->cq(),
+                          method.name(), context->authority().empty()
+                                             ? host_str
+                                             : context->authority().c_str(),
+                          context->raw_deadline());
+  grpc_census_call_set_context(c_call, context->census_context());
   GRPC_TIMER_MARK(GRPC_PTAG_CPP_CALL_CREATED, c_call);
   context->set_call(c_call, shared_from_this());
   return Call(c_call, this, cq);
@@ -87,7 +92,47 @@ void Channel::PerformOpsOnCall(CallOpSetInterface* ops, Call* call) {
 }
 
 void* Channel::RegisterMethod(const char* method) {
-  return grpc_channel_register_call(c_channel_, method, target_.c_str());
+  return grpc_channel_register_call(c_channel_, method,
+                                    host_.empty() ? NULL : host_.c_str());
+}
+
+grpc_connectivity_state Channel::GetState(bool try_to_connect) {
+  return grpc_channel_check_connectivity_state(c_channel_, try_to_connect);
+}
+
+namespace {
+class TagSaver GRPC_FINAL : public CompletionQueueTag {
+ public:
+  explicit TagSaver(void* tag) : tag_(tag) {}
+  ~TagSaver() GRPC_OVERRIDE {}
+  bool FinalizeResult(void** tag, bool* status) GRPC_OVERRIDE {
+    *tag = tag_;
+    delete this;
+    return true;
+  }
+ private:
+  void* tag_;
+};
+
+}  // namespace
+
+void Channel::NotifyOnStateChangeImpl(grpc_connectivity_state last_observed,
+                                      gpr_timespec deadline,
+                                      CompletionQueue* cq, void* tag) {
+  TagSaver* tag_saver = new TagSaver(tag);
+  grpc_channel_watch_connectivity_state(c_channel_, last_observed, deadline,
+                                        cq->cq(), tag_saver);
+}
+
+bool Channel::WaitForStateChangeImpl(grpc_connectivity_state last_observed,
+                                     gpr_timespec deadline) {
+  CompletionQueue cq;
+  bool ok = false;
+  void* tag = NULL;
+  NotifyOnStateChangeImpl(last_observed, deadline, &cq, NULL);
+  cq.Next(&tag, &ok);
+  GPR_ASSERT(tag == NULL);
+  return ok;
 }
 
 }  // namespace grpc
diff --git a/src/cpp/client/channel.h b/src/cpp/client/channel.h
index 9108713c58..cb8e8d98d2 100644
--- a/src/cpp/client/channel.h
+++ b/src/cpp/client/channel.h
@@ -52,17 +52,27 @@ class StreamContextInterface;
 
 class Channel GRPC_FINAL : public GrpcLibrary, public ChannelInterface {
  public:
-  Channel(const grpc::string& target, grpc_channel* c_channel);
+  explicit Channel(grpc_channel* c_channel);
+  Channel(const grpc::string& host, grpc_channel* c_channel);
   ~Channel() GRPC_OVERRIDE;
 
-  virtual void* RegisterMethod(const char* method) GRPC_OVERRIDE;
-  virtual Call CreateCall(const RpcMethod& method, ClientContext* context,
+  void* RegisterMethod(const char* method) GRPC_OVERRIDE;
+  Call CreateCall(const RpcMethod& method, ClientContext* context,
                           CompletionQueue* cq) GRPC_OVERRIDE;
-  virtual void PerformOpsOnCall(CallOpSetInterface* ops,
+  void PerformOpsOnCall(CallOpSetInterface* ops,
                                 Call* call) GRPC_OVERRIDE;
 
+  grpc_connectivity_state GetState(bool try_to_connect) GRPC_OVERRIDE;
+
  private:
-  const grpc::string target_;
+  void NotifyOnStateChangeImpl(grpc_connectivity_state last_observed,
+                               gpr_timespec deadline, CompletionQueue* cq,
+                               void* tag) GRPC_OVERRIDE;
+
+  bool WaitForStateChangeImpl(grpc_connectivity_state last_observed,
+                              gpr_timespec deadline) GRPC_OVERRIDE;
+
+  const grpc::string host_;
   grpc_channel* const c_channel_;  // owned
 };
 
diff --git a/src/cpp/client/client_context.cc b/src/cpp/client/client_context.cc
index 14ab772e50..1ed2d38961 100644
--- a/src/cpp/client/client_context.cc
+++ b/src/cpp/client/client_context.cc
@@ -34,8 +34,10 @@
 #include <grpc++/client_context.h>
 
 #include <grpc/grpc.h>
+#include <grpc/support/alloc.h>
 #include <grpc/support/string_util.h>
 #include <grpc++/credentials.h>
+#include <grpc++/server_context.h>
 #include <grpc++/time.h>
 
 #include "src/core/channel/compress_filter.h"
@@ -47,7 +49,8 @@ ClientContext::ClientContext()
     : initial_metadata_received_(false),
       call_(nullptr),
       cq_(nullptr),
-      deadline_(gpr_inf_future(GPR_CLOCK_REALTIME)) {}
+      deadline_(gpr_inf_future(GPR_CLOCK_REALTIME)),
+      propagate_from_call_(nullptr) {}
 
 ClientContext::~ClientContext() {
   if (call_) {
@@ -63,6 +66,14 @@ ClientContext::~ClientContext() {
   }
 }
 
+std::unique_ptr<ClientContext> ClientContext::FromServerContext(
+    const ServerContext& context, PropagationOptions options) {
+  std::unique_ptr<ClientContext> ctx(new ClientContext);
+  ctx->propagate_from_call_ = context.call_;
+  ctx->propagation_options_ = options;
+  return ctx;
+}
+
 void ClientContext::AddMetadata(const grpc::string& meta_key,
                                 const grpc::string& meta_value) {
   send_initial_metadata_.insert(std::make_pair(meta_key, meta_value));
@@ -104,4 +115,14 @@ void ClientContext::TryCancel() {
   }
 }
 
+grpc::string ClientContext::peer() const {
+  grpc::string peer;
+  if (call_) {
+    char* c_peer = grpc_call_get_peer(call_);
+    peer = c_peer;
+    gpr_free(c_peer);
+  }
+  return peer;
+}
+
 }  // namespace grpc
diff --git a/src/cpp/client/create_channel.cc b/src/cpp/client/create_channel.cc
index 38eeda0dc0..21d01b739d 100644
--- a/src/cpp/client/create_channel.cc
+++ b/src/cpp/client/create_channel.cc
@@ -52,6 +52,6 @@ std::shared_ptr<ChannelInterface> CreateChannel(
                     user_agent_prefix.str());
   return creds ? creds->CreateChannel(target, cp_args)
                : std::shared_ptr<ChannelInterface>(
-                     new Channel(target, grpc_lame_client_channel_create()));
+                     new Channel(grpc_lame_client_channel_create(NULL)));
 }
 }  // namespace grpc
diff --git a/src/cpp/client/insecure_credentials.cc b/src/cpp/client/insecure_credentials.cc
index 5ad8784567..d8dcaa1436 100644
--- a/src/cpp/client/insecure_credentials.cc
+++ b/src/cpp/client/insecure_credentials.cc
@@ -49,7 +49,7 @@ class InsecureCredentialsImpl GRPC_FINAL : public Credentials {
     grpc_channel_args channel_args;
     args.SetChannelArgs(&channel_args);
     return std::shared_ptr<ChannelInterface>(new Channel(
-        target, grpc_channel_create(target.c_str(), &channel_args)));
+        grpc_insecure_channel_create(target.c_str(), &channel_args)));
   }
 
   // InsecureCredentials should not be applied to a call.
diff --git a/src/cpp/client/secure_credentials.cc b/src/cpp/client/secure_credentials.cc
index 01c7f14f1a..2d6114e06b 100644
--- a/src/cpp/client/secure_credentials.cc
+++ b/src/cpp/client/secure_credentials.cc
@@ -44,8 +44,7 @@ std::shared_ptr<grpc::ChannelInterface> SecureCredentials::CreateChannel(
   grpc_channel_args channel_args;
   args.SetChannelArgs(&channel_args);
   return std::shared_ptr<ChannelInterface>(new Channel(
-      args.GetSslTargetNameOverride().empty() ? target
-                                              : args.GetSslTargetNameOverride(),
+      args.GetSslTargetNameOverride(),
       grpc_secure_channel_create(c_creds_, target.c_str(), &channel_args)));
 }
 
@@ -99,8 +98,8 @@ std::shared_ptr<Credentials> ServiceAccountCredentials(
 }
 
 // Builds JWT credentials.
-std::shared_ptr<Credentials> JWTCredentials(const grpc::string& json_key,
-                                            long token_lifetime_seconds) {
+std::shared_ptr<Credentials> ServiceAccountJWTAccessCredentials(
+    const grpc::string& json_key, long token_lifetime_seconds) {
   if (token_lifetime_seconds <= 0) {
     gpr_log(GPR_ERROR,
             "Trying to create JWTCredentials with non-positive lifetime");
@@ -108,8 +107,8 @@ std::shared_ptr<Credentials> JWTCredentials(const grpc::string& json_key,
   }
   gpr_timespec lifetime =
       gpr_time_from_seconds(token_lifetime_seconds, GPR_TIMESPAN);
-  return WrapCredentials(
-      grpc_jwt_credentials_create(json_key.c_str(), lifetime));
+  return WrapCredentials(grpc_service_account_jwt_access_credentials_create(
+      json_key.c_str(), lifetime));
 }
 
 // Builds refresh token credentials.
diff --git a/src/cpp/server/create_default_thread_pool.cc b/src/cpp/server/create_default_thread_pool.cc
index cc182f59f4..81c84474d8 100644
--- a/src/cpp/server/create_default_thread_pool.cc
+++ b/src/cpp/server/create_default_thread_pool.cc
@@ -32,7 +32,7 @@
  */
 
 #include <grpc/support/cpu.h>
-#include <grpc++/fixed_size_thread_pool.h>
+#include <grpc++/dynamic_thread_pool.h>
 
 #ifndef GRPC_CUSTOM_DEFAULT_THREAD_POOL
 
@@ -41,7 +41,7 @@ namespace grpc {
 ThreadPoolInterface* CreateDefaultThreadPool() {
    int cores = gpr_cpu_num_cores();
    if (!cores) cores = 4;
-   return new FixedSizeThreadPool(cores);
+   return new DynamicThreadPool(cores);
 }
 
 }  // namespace grpc
diff --git a/src/cpp/server/dynamic_thread_pool.cc b/src/cpp/server/dynamic_thread_pool.cc
new file mode 100644
index 0000000000..f58d0420df
--- /dev/null
+++ b/src/cpp/server/dynamic_thread_pool.cc
@@ -0,0 +1,131 @@
+/*
+ *
+ * Copyright 2015, Google Inc.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *
+ *     * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above
+ * copyright notice, this list of conditions and the following disclaimer
+ * in the documentation and/or other materials provided with the
+ * distribution.
+ *     * Neither the name of Google Inc. nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ */
+
+#include <grpc++/impl/sync.h>
+#include <grpc++/impl/thd.h>
+#include <grpc++/dynamic_thread_pool.h>
+
+namespace grpc {
+DynamicThreadPool::DynamicThread::DynamicThread(DynamicThreadPool *pool):
+  pool_(pool),
+  thd_(new grpc::thread(&DynamicThreadPool::DynamicThread::ThreadFunc, this)) {
+}
+DynamicThreadPool::DynamicThread::~DynamicThread() {
+  thd_->join();
+  thd_.reset();
+}
+
+void DynamicThreadPool::DynamicThread::ThreadFunc() {
+  pool_->ThreadFunc();
+  // Now that we have killed ourselves, we should reduce the thread count
+  grpc::unique_lock<grpc::mutex> lock(pool_->mu_);
+  pool_->nthreads_--;
+  // Move ourselves to dead list
+  pool_->dead_threads_.push_back(this);
+
+  if ((pool_->shutdown_) && (pool_->nthreads_ == 0)) {
+    pool_->shutdown_cv_.notify_one();
+  }
+}
+  
+void DynamicThreadPool::ThreadFunc() {
+  for (;;) {
+    // Wait until work is available or we are shutting down.
+    grpc::unique_lock<grpc::mutex> lock(mu_);
+    if (!shutdown_ && callbacks_.empty()) {
+      // If there are too many threads waiting, then quit this thread
+      if (threads_waiting_ >= reserve_threads_) {
+	break;
+      }
+      threads_waiting_++;
+      cv_.wait(lock);
+      threads_waiting_--;
+    }
+    // Drain callbacks before considering shutdown to ensure all work
+    // gets completed.
+    if (!callbacks_.empty()) {
+      auto cb = callbacks_.front();
+      callbacks_.pop();
+      lock.unlock();
+      cb();
+    } else if (shutdown_) {
+      break;
+    }
+  }
+}
+
+DynamicThreadPool::DynamicThreadPool(int reserve_threads) :
+  shutdown_(false), reserve_threads_(reserve_threads), nthreads_(0),
+  threads_waiting_(0) {
+  for (int i = 0; i < reserve_threads_; i++) {
+    grpc::lock_guard<grpc::mutex> lock(mu_);
+    nthreads_++;
+    new DynamicThread(this);
+  }
+}
+
+void DynamicThreadPool::ReapThreads(std::list<DynamicThread*>* tlist) {
+  for (auto t = tlist->begin(); t != tlist->end(); t = tlist->erase(t)) {
+    delete *t;    
+  }
+}
+  
+DynamicThreadPool::~DynamicThreadPool() {
+  grpc::unique_lock<grpc::mutex> lock(mu_);
+  shutdown_ = true;
+  cv_.notify_all();
+  while (nthreads_ != 0) {
+    shutdown_cv_.wait(lock);
+  }
+  ReapThreads(&dead_threads_);
+}
+
+void DynamicThreadPool::Add(const std::function<void()>& callback) {
+  grpc::lock_guard<grpc::mutex> lock(mu_);
+  // Add works to the callbacks list
+  callbacks_.push(callback);
+  // Increase pool size or notify as needed
+  if (threads_waiting_ == 0) {
+    // Kick off a new thread
+    nthreads_++;
+    new DynamicThread(this);
+  } else {
+    cv_.notify_one();
+  }
+  // Also use this chance to harvest dead threads
+  if (!dead_threads_.empty()) {
+    ReapThreads(&dead_threads_);
+  }
+}
+
+}  // namespace grpc
diff --git a/src/cpp/server/insecure_server_credentials.cc b/src/cpp/server/insecure_server_credentials.cc
index aca3568e59..800cd36caa 100644
--- a/src/cpp/server/insecure_server_credentials.cc
+++ b/src/cpp/server/insecure_server_credentials.cc
@@ -41,7 +41,7 @@ class InsecureServerCredentialsImpl GRPC_FINAL : public ServerCredentials {
  public:
   int AddPortToServer(const grpc::string& addr,
                       grpc_server* server) GRPC_OVERRIDE {
-    return grpc_server_add_http2_port(server, addr.c_str());
+    return grpc_server_add_insecure_http2_port(server, addr.c_str());
   }
 };
 }  // namespace
diff --git a/src/cpp/server/secure_server_credentials.cc b/src/cpp/server/secure_server_credentials.cc
index 3e262dd74f..32c45e2280 100644
--- a/src/cpp/server/secure_server_credentials.cc
+++ b/src/cpp/server/secure_server_credentials.cc
@@ -51,7 +51,8 @@ std::shared_ptr<ServerCredentials> SslServerCredentials(
   }
   grpc_server_credentials* c_creds = grpc_ssl_server_credentials_create(
       options.pem_root_certs.empty() ? nullptr : options.pem_root_certs.c_str(),
-      &pem_key_cert_pairs[0], pem_key_cert_pairs.size());
+      &pem_key_cert_pairs[0], pem_key_cert_pairs.size(),
+      options.force_client_auth);
   return std::shared_ptr<ServerCredentials>(
       new SecureServerCredentials(c_creds));
 }
diff --git a/src/cpp/server/server_context.cc b/src/cpp/server/server_context.cc
index bf7a4ba5ec..04373397f9 100644
--- a/src/cpp/server/server_context.cc
+++ b/src/cpp/server/server_context.cc
@@ -34,6 +34,7 @@
 #include <grpc++/server_context.h>
 
 #include <grpc/grpc.h>
+#include <grpc/support/alloc.h>
 #include <grpc/support/log.h>
 #include <grpc++/impl/call.h>
 #include <grpc++/impl/sync.h>
@@ -49,16 +50,23 @@ namespace grpc {
 class ServerContext::CompletionOp GRPC_FINAL : public CallOpSetInterface {
  public:
   // initial refs: one in the server context, one in the cq
-  CompletionOp() : refs_(2), finalized_(false), cancelled_(0) {}
+  CompletionOp() : has_tag_(false), tag_(nullptr), refs_(2), finalized_(false), cancelled_(0) {}
 
   void FillOps(grpc_op* ops, size_t* nops) GRPC_OVERRIDE;
   bool FinalizeResult(void** tag, bool* status) GRPC_OVERRIDE;
 
   bool CheckCancelled(CompletionQueue* cq);
 
+  void set_tag(void* tag) {
+    has_tag_ = true;
+    tag_ = tag;
+  }
+
   void Unref();
 
  private:
+  bool has_tag_;
+  void* tag_;
   grpc::mutex mu_;
   int refs_;
   bool finalized_;
@@ -89,18 +97,25 @@ void ServerContext::CompletionOp::FillOps(grpc_op* ops, size_t* nops) {
 bool ServerContext::CompletionOp::FinalizeResult(void** tag, bool* status) {
   grpc::unique_lock<grpc::mutex> lock(mu_);
   finalized_ = true;
+  bool ret = false;
+  if (has_tag_) {
+    *tag = tag_;
+    ret = true;
+  }
   if (!*status) cancelled_ = 1;
   if (--refs_ == 0) {
     lock.unlock();
     delete this;
   }
-  return false;
+  return ret;
 }
 
 // ServerContext body
 
 ServerContext::ServerContext()
     : completion_op_(nullptr),
+      has_notify_when_done_tag_(false),
+      async_notify_when_done_tag_(nullptr),
       call_(nullptr),
       cq_(nullptr),
       sent_initial_metadata_(false) {}
@@ -108,6 +123,8 @@ ServerContext::ServerContext()
 ServerContext::ServerContext(gpr_timespec deadline, grpc_metadata* metadata,
                              size_t metadata_count)
     : completion_op_(nullptr),
+      has_notify_when_done_tag_(false),
+      async_notify_when_done_tag_(nullptr),
       deadline_(deadline),
       call_(nullptr),
       cq_(nullptr),
@@ -132,6 +149,9 @@ ServerContext::~ServerContext() {
 void ServerContext::BeginCompletionOp(Call* call) {
   GPR_ASSERT(!completion_op_);
   completion_op_ = new CompletionOp();
+  if (has_notify_when_done_tag_) {
+    completion_op_->set_tag(async_notify_when_done_tag_);
+  }
   call->PerformOps(completion_op_);
 }
 
@@ -179,4 +199,18 @@ std::shared_ptr<const AuthContext> ServerContext::auth_context() const {
   return auth_context_;
 }
 
+grpc::string ServerContext::peer() const {
+  grpc::string peer;
+  if (call_) {
+    char* c_peer = grpc_call_get_peer(call_);
+    peer = c_peer;
+    gpr_free(c_peer);
+  }
+  return peer;
+}
+
+const struct census_context* ServerContext::census_context() const {
+  return grpc_census_call_get_context(call_);
+}
+
 }  // namespace grpc
diff --git a/src/cpp/util/time.cc b/src/cpp/util/time.cc
index a814cad452..799c597e0b 100644
--- a/src/cpp/util/time.cc
+++ b/src/cpp/util/time.cc
@@ -79,9 +79,10 @@ void TimepointHR2Timespec(const high_resolution_clock::time_point& from,
 }
 
 system_clock::time_point Timespec2Timepoint(gpr_timespec t) {
-  if (gpr_time_cmp(t, gpr_inf_future(GPR_CLOCK_REALTIME)) == 0) {
+  if (gpr_time_cmp(t, gpr_inf_future(t.clock_type)) == 0) {
     return system_clock::time_point::max();
   }
+  t = gpr_convert_clock_type(t, GPR_CLOCK_REALTIME);
   system_clock::time_point tp;
   tp += duration_cast<system_clock::time_point::duration>(seconds(t.tv_sec));
   tp +=
diff --git a/src/csharp/Grpc.Auth/GoogleCredential.cs b/src/csharp/Grpc.Auth/GoogleCredential.cs
index 7edf19ed67..9936cf583c 100644
--- a/src/csharp/Grpc.Auth/GoogleCredential.cs
+++ b/src/csharp/Grpc.Auth/GoogleCredential.cs
@@ -89,17 +89,15 @@ namespace Grpc.Auth
                 return new GoogleCredential(new ComputeCredential(new ComputeCredential.Initializer()));
             }
 
-            JObject o1 = JObject.Parse(File.ReadAllText(credsPath));
-            string clientEmail = o1.GetValue(ClientEmailFieldName).Value<string>();
-            string privateKeyString = o1.GetValue(PrivateKeyFieldName).Value<string>();
-            var privateKey = ParsePrivateKeyFromString(privateKeyString);
+            JObject jsonCredentialParameters = JObject.Parse(File.ReadAllText(credsPath));
+            string clientEmail = jsonCredentialParameters.GetValue(ClientEmailFieldName).Value<string>();
+            string privateKeyString = jsonCredentialParameters.GetValue(PrivateKeyFieldName).Value<string>();
 
             var serviceCredential = new ServiceAccountCredential(
                 new ServiceAccountCredential.Initializer(clientEmail)
                 {
                     Scopes = scopes,
-                    Key = privateKey
-                });
+                }.FromPrivateKey(privateKeyString));
             return new GoogleCredential(serviceCredential);
         }
 
@@ -123,16 +121,5 @@ namespace Grpc.Auth
                 return credential;
             }
         }
-
-        private RSACryptoServiceProvider ParsePrivateKeyFromString(string base64PrivateKey)
-        {
-            // TODO(jtattermusch): temporary code to create RSACryptoServiceProvider.
-            base64PrivateKey = base64PrivateKey.Replace("-----BEGIN PRIVATE KEY-----", "").Replace("\n", "").Replace("-----END PRIVATE KEY-----", "");
-            RsaPrivateCrtKeyParameters key = (RsaPrivateCrtKeyParameters)PrivateKeyFactory.CreateKey(Convert.FromBase64String(base64PrivateKey));
-            RSAParameters rsaParameters = DotNetUtilities.ToRSAParameters(key);
-            RSACryptoServiceProvider rsa = new RSACryptoServiceProvider();
-            rsa.ImportParameters(rsaParameters);
-            return rsa;
-        }
     }
 }
diff --git a/src/csharp/Grpc.Auth/Grpc.Auth.csproj b/src/csharp/Grpc.Auth/Grpc.Auth.csproj
index fdec2e7bd7..8e5036832d 100644
--- a/src/csharp/Grpc.Auth/Grpc.Auth.csproj
+++ b/src/csharp/Grpc.Auth/Grpc.Auth.csproj
@@ -11,6 +11,7 @@
     <AssemblyName>Grpc.Auth</AssemblyName>
     <TargetFrameworkVersion>v4.5</TargetFrameworkVersion>
     <DocumentationFile>bin\$(Configuration)\Grpc.Auth.Xml</DocumentationFile>
+    <NuGetPackageImportStamp>9b408026</NuGetPackageImportStamp>
   </PropertyGroup>
   <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Debug|AnyCPU' ">
     <DebugSymbols>true</DebugSymbols>
@@ -23,25 +24,37 @@
     <ConsolePause>false</ConsolePause>
   </PropertyGroup>
   <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Release|AnyCPU' ">
-    <DebugType>full</DebugType>
+    <DebugType>pdbonly</DebugType>
     <Optimize>true</Optimize>
     <OutputPath>bin\Release</OutputPath>
     <ErrorReport>prompt</ErrorReport>
     <WarningLevel>4</WarningLevel>
     <ConsolePause>false</ConsolePause>
   </PropertyGroup>
+  <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'ReleaseSigned|AnyCPU' ">
+    <DebugType>pdbonly</DebugType>
+    <Optimize>true</Optimize>
+    <OutputPath>bin\ReleaseSigned</OutputPath>
+    <ErrorReport>prompt</ErrorReport>
+    <WarningLevel>4</WarningLevel>
+    <SignAssembly>True</SignAssembly>
+    <AssemblyOriginatorKeyFile>C:\keys\Grpc.snk</AssemblyOriginatorKeyFile>
+  </PropertyGroup>
   <ItemGroup>
     <Reference Include="BouncyCastle.Crypto">
       <HintPath>..\packages\BouncyCastle.1.7.0\lib\Net40-Client\BouncyCastle.Crypto.dll</HintPath>
     </Reference>
-    <Reference Include="Google.Apis.Auth">
-      <HintPath>..\packages\Google.Apis.Auth.1.9.1\lib\net40\Google.Apis.Auth.dll</HintPath>
+    <Reference Include="Google.Apis.Auth, Version=1.9.2.27817, Culture=neutral, PublicKeyToken=4b01fa6e34db77ab, processorArchitecture=MSIL">
+      <SpecificVersion>False</SpecificVersion>
+      <HintPath>..\packages\Google.Apis.Auth.1.9.2\lib\net40\Google.Apis.Auth.dll</HintPath>
     </Reference>
-    <Reference Include="Google.Apis.Auth.PlatformServices">
-      <HintPath>..\packages\Google.Apis.Auth.1.9.1\lib\net40\Google.Apis.Auth.PlatformServices.dll</HintPath>
+    <Reference Include="Google.Apis.Auth.PlatformServices, Version=1.9.2.27820, Culture=neutral, PublicKeyToken=4b01fa6e34db77ab, processorArchitecture=MSIL">
+      <SpecificVersion>False</SpecificVersion>
+      <HintPath>..\packages\Google.Apis.Auth.1.9.2\lib\net40\Google.Apis.Auth.PlatformServices.dll</HintPath>
     </Reference>
-    <Reference Include="Google.Apis.Core">
-      <HintPath>..\packages\Google.Apis.Core.1.9.1\lib\portable-net40+sl50+win+wpa81+wp80\Google.Apis.Core.dll</HintPath>
+    <Reference Include="Google.Apis.Core, Version=1.9.2.27816, Culture=neutral, PublicKeyToken=4b01fa6e34db77ab, processorArchitecture=MSIL">
+      <SpecificVersion>False</SpecificVersion>
+      <HintPath>..\packages\Google.Apis.Core.1.9.2\lib\portable-net40+sl50+win+wpa81+wp80\Google.Apis.Core.dll</HintPath>
     </Reference>
     <Reference Include="Microsoft.Threading.Tasks">
       <HintPath>..\packages\Microsoft.Bcl.Async.1.0.168\lib\net40\Microsoft.Threading.Tasks.dll</HintPath>
@@ -52,18 +65,20 @@
     <Reference Include="Microsoft.Threading.Tasks.Extensions.Desktop">
       <HintPath>..\packages\Microsoft.Bcl.Async.1.0.168\lib\net40\Microsoft.Threading.Tasks.Extensions.Desktop.dll</HintPath>
     </Reference>
-    <Reference Include="Newtonsoft.Json, Version=6.0.0.0, Culture=neutral, PublicKeyToken=30ad4fe6b2a6aeed, processorArchitecture=MSIL">
+    <Reference Include="Newtonsoft.Json, Version=7.0.0.0, Culture=neutral, PublicKeyToken=30ad4fe6b2a6aeed, processorArchitecture=MSIL">
       <SpecificVersion>False</SpecificVersion>
-      <HintPath>..\packages\Newtonsoft.Json.6.0.6\lib\net45\Newtonsoft.Json.dll</HintPath>
+      <HintPath>..\packages\Newtonsoft.Json.7.0.1\lib\net45\Newtonsoft.Json.dll</HintPath>
     </Reference>
     <Reference Include="System" />
     <Reference Include="System.Net" />
     <Reference Include="System.Net.Http" />
-    <Reference Include="System.Net.Http.Extensions">
-      <HintPath>..\packages\Microsoft.Net.Http.2.2.28\lib\net45\System.Net.Http.Extensions.dll</HintPath>
+    <Reference Include="System.Net.Http.Extensions, Version=2.2.29.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a, processorArchitecture=MSIL">
+      <SpecificVersion>False</SpecificVersion>
+      <HintPath>..\packages\Microsoft.Net.Http.2.2.29\lib\net45\System.Net.Http.Extensions.dll</HintPath>
     </Reference>
-    <Reference Include="System.Net.Http.Primitives">
-      <HintPath>..\packages\Microsoft.Net.Http.2.2.28\lib\net45\System.Net.Http.Primitives.dll</HintPath>
+    <Reference Include="System.Net.Http.Primitives, Version=4.2.29.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a, processorArchitecture=MSIL">
+      <SpecificVersion>False</SpecificVersion>
+      <HintPath>..\packages\Microsoft.Net.Http.2.2.29\lib\net45\System.Net.Http.Primitives.dll</HintPath>
     </Reference>
     <Reference Include="System.Net.Http.WebRequest" />
   </ItemGroup>
@@ -73,7 +88,7 @@
     </Compile>
     <Compile Include="Properties\AssemblyInfo.cs" />
     <Compile Include="GoogleCredential.cs" />
-    <Compile Include="OAuth2InterceptorFactory.cs" />
+    <Compile Include="OAuth2Interceptors.cs" />
   </ItemGroup>
   <Import Project="$(MSBuildBinPath)\Microsoft.CSharp.targets" />
   <ItemGroup>
@@ -87,9 +102,11 @@
     <None Include="Grpc.Auth.nuspec" />
     <None Include="packages.config" />
   </ItemGroup>
-  <Import Project="..\packages\Microsoft.Bcl.Build.1.0.14\tools\Microsoft.Bcl.Build.targets" Condition="Exists('..\packages\Microsoft.Bcl.Build.1.0.14\tools\Microsoft.Bcl.Build.targets')" />
-  <Target Name="EnsureBclBuildImported" BeforeTargets="BeforeBuild" Condition="'$(BclBuildImported)' == ''">
-    <Error Condition="!Exists('..\packages\Microsoft.Bcl.Build.1.0.14\tools\Microsoft.Bcl.Build.targets')" Text="This project references NuGet package(s) that are missing on this computer. Enable NuGet Package Restore to download them.  For more information, see http://go.microsoft.com/fwlink/?LinkID=317567." HelpKeyword="BCLBUILD2001" />
-    <Error Condition="Exists('..\packages\Microsoft.Bcl.Build.1.0.14\tools\Microsoft.Bcl.Build.targets')" Text="The build restored NuGet packages. Build the project again to include these packages in the build. For more information, see http://go.microsoft.com/fwlink/?LinkID=317568." HelpKeyword="BCLBUILD2002" />
+  <Import Project="..\packages\Microsoft.Bcl.Build.1.0.21\build\Microsoft.Bcl.Build.targets" Condition="Exists('..\packages\Microsoft.Bcl.Build.1.0.21\build\Microsoft.Bcl.Build.targets')" />
+  <Target Name="EnsureNuGetPackageBuildImports" BeforeTargets="PrepareForBuild">
+    <PropertyGroup>
+      <ErrorText>This project references NuGet package(s) that are missing on this computer. Enable NuGet Package Restore to download them.  For more information, see http://go.microsoft.com/fwlink/?LinkID=322105. The missing file is {0}.</ErrorText>
+    </PropertyGroup>
+    <Error Condition="!Exists('..\packages\Microsoft.Bcl.Build.1.0.21\build\Microsoft.Bcl.Build.targets')" Text="$([System.String]::Format('$(ErrorText)', '..\packages\Microsoft.Bcl.Build.1.0.21\build\Microsoft.Bcl.Build.targets'))" />
   </Target>
 </Project>
\ No newline at end of file
diff --git a/src/csharp/Grpc.Auth/Grpc.Auth.nuspec b/src/csharp/Grpc.Auth/Grpc.Auth.nuspec
index 1262bdbdab..2dc10d24c2 100644
--- a/src/csharp/Grpc.Auth/Grpc.Auth.nuspec
+++ b/src/csharp/Grpc.Auth/Grpc.Auth.nuspec
@@ -15,15 +15,14 @@
     <copyright>Copyright 2015, Google Inc.</copyright>
     <tags>gRPC RPC Protocol HTTP/2 Auth OAuth2</tags>
 	<dependencies>
-	  <dependency id="BouncyCastle" version="1.7.0" />
-	  <dependency id="Google.Apis.Auth" version="1.9.1" />
+	  <dependency id="Google.Apis.Auth" version="1.9.2" />
 	  <dependency id="Grpc.Core" version="$version$" />
     </dependencies>
   </metadata>
   <files>
-    <file src="bin/Release/Grpc.Auth.dll" target="lib/net45" />
-	<file src="bin/Release/Grpc.Auth.pdb" target="lib/net45" />
-	<file src="bin/Release/Grpc.Auth.xml" target="lib/net45" />
+    <file src="bin/ReleaseSigned/Grpc.Auth.dll" target="lib/net45" />
+	<file src="bin/ReleaseSigned/Grpc.Auth.pdb" target="lib/net45" />
+	<file src="bin/ReleaseSigned/Grpc.Auth.xml" target="lib/net45" />
 	<file src="**\*.cs" target="src" />
   </files>
 </package>
diff --git a/src/csharp/Grpc.Auth/OAuth2InterceptorFactory.cs b/src/csharp/Grpc.Auth/OAuth2Interceptors.cs
index 420c4cb537..cc9d2c175f 100644
--- a/src/csharp/Grpc.Auth/OAuth2InterceptorFactory.cs
+++ b/src/csharp/Grpc.Auth/OAuth2Interceptors.cs
@@ -47,18 +47,32 @@ using Grpc.Core.Utils;
 
 namespace Grpc.Auth
 {
-    public static class OAuth2InterceptorFactory
+    public static class OAuth2Interceptors
     {
         /// <summary>
-        /// Creates OAuth2 interceptor.
+        /// Creates OAuth2 interceptor that will obtain access token from GoogleCredentials.
         /// </summary>
-        public static MetadataInterceptorDelegate Create(GoogleCredential googleCredential)
+        public static MetadataInterceptorDelegate FromCredential(GoogleCredential googleCredential)
         {
             var interceptor = new OAuth2Interceptor(googleCredential.InternalCredential, SystemClock.Default);
             return new MetadataInterceptorDelegate(interceptor.InterceptHeaders);
         }
 
         /// <summary>
+        /// Creates OAuth2 interceptor that will use given OAuth2 token.
+        /// </summary>
+        /// <param name="oauth2Token"></param>
+        /// <returns></returns>
+        public static MetadataInterceptorDelegate FromAccessToken(string oauth2Token)
+        {
+            Preconditions.CheckNotNull(oauth2Token);
+            return new MetadataInterceptorDelegate((metadata) =>
+            {
+                metadata.Add(OAuth2Interceptor.CreateBearerTokenHeader(oauth2Token));
+            });
+        }
+
+        /// <summary>
         /// Injects OAuth2 authorization header into initial metadata (= request headers).
         /// </summary>
         private class OAuth2Interceptor
@@ -97,7 +111,12 @@ namespace Grpc.Auth
             public void InterceptHeaders(Metadata metadata)
             {
                 var accessToken = GetAccessToken(CancellationToken.None);
-                metadata.Add(new Metadata.Entry(AuthorizationHeader, Schema + " " + accessToken));
+                metadata.Add(CreateBearerTokenHeader(accessToken));
+            }
+
+            public static Metadata.Entry CreateBearerTokenHeader(string accessToken)
+            {
+                return new Metadata.Entry(AuthorizationHeader, Schema + " " + accessToken);
             }
         }
     }
diff --git a/src/csharp/Grpc.Auth/Properties/AssemblyInfo.cs b/src/csharp/Grpc.Auth/Properties/AssemblyInfo.cs
index 70cb32d5b2..83396c546b 100644
--- a/src/csharp/Grpc.Auth/Properties/AssemblyInfo.cs
+++ b/src/csharp/Grpc.Auth/Properties/AssemblyInfo.cs
@@ -9,5 +9,3 @@ using System.Runtime.CompilerServices;
 [assembly: AssemblyCopyright("Google Inc.  All rights reserved.")]
 [assembly: AssemblyTrademark("")]
 [assembly: AssemblyCulture("")]
-
-[assembly: InternalsVisibleTo("Grpc.Auth.Tests")]
diff --git a/src/csharp/Grpc.Auth/app.config b/src/csharp/Grpc.Auth/app.config
index 966b777192..0a82bb4f16 100644
--- a/src/csharp/Grpc.Auth/app.config
+++ b/src/csharp/Grpc.Auth/app.config
@@ -4,7 +4,7 @@
     <assemblyBinding xmlns="urn:schemas-microsoft-com:asm.v1">
       <dependentAssembly>
         <assemblyIdentity name="System.Net.Http.Primitives" publicKeyToken="b03f5f7f11d50a3a" culture="neutral" />
-        <bindingRedirect oldVersion="0.0.0.0-4.2.28.0" newVersion="4.2.28.0" />
+        <bindingRedirect oldVersion="0.0.0.0-4.2.29.0" newVersion="4.2.29.0" />
       </dependentAssembly>
       <dependentAssembly>
         <assemblyIdentity name="System.Net.Http" publicKeyToken="b03f5f7f11d50a3a" culture="neutral" />
diff --git a/src/csharp/Grpc.Auth/packages.config b/src/csharp/Grpc.Auth/packages.config
index 7d348872ba..29be953bf3 100644
--- a/src/csharp/Grpc.Auth/packages.config
+++ b/src/csharp/Grpc.Auth/packages.config
@@ -1,11 +1,11 @@
 <?xml version="1.0" encoding="utf-8"?>
 <packages>
   <package id="BouncyCastle" version="1.7.0" targetFramework="net45" />
-  <package id="Google.Apis.Auth" version="1.9.1" targetFramework="net45" />
-  <package id="Google.Apis.Core" version="1.9.1" targetFramework="net45" />
-  <package id="Microsoft.Bcl" version="1.1.9" targetFramework="net45" />
+  <package id="Google.Apis.Auth" version="1.9.2" targetFramework="net45" />
+  <package id="Google.Apis.Core" version="1.9.2" targetFramework="net45" />
+  <package id="Microsoft.Bcl" version="1.1.10" targetFramework="net45" />
   <package id="Microsoft.Bcl.Async" version="1.0.168" targetFramework="net45" />
-  <package id="Microsoft.Bcl.Build" version="1.0.14" targetFramework="net45" />
-  <package id="Microsoft.Net.Http" version="2.2.28" targetFramework="net45" />
-  <package id="Newtonsoft.Json" version="6.0.6" targetFramework="net45" />
+  <package id="Microsoft.Bcl.Build" version="1.0.21" targetFramework="net45" />
+  <package id="Microsoft.Net.Http" version="2.2.29" targetFramework="net45" />
+  <package id="Newtonsoft.Json" version="7.0.1" targetFramework="net45" />
 </packages>
\ No newline at end of file
diff --git a/src/csharp/Grpc.Core.Tests/TimespecTest.cs b/src/csharp/Grpc.Core.Tests/ChannelTest.cs
index a34b407a01..60b45176e5 100644
--- a/src/csharp/Grpc.Core.Tests/TimespecTest.cs
+++ b/src/csharp/Grpc.Core.Tests/ChannelTest.cs
@@ -32,70 +32,60 @@
 #endregion
 
 using System;
-using System.Runtime.InteropServices;
+using Grpc.Core;
 using Grpc.Core.Internal;
+using Grpc.Core.Utils;
 using NUnit.Framework;
 
-namespace Grpc.Core.Internal.Tests
+namespace Grpc.Core.Tests
 {
-    public class TimespecTest
+    public class ChannelTest
     {
-        [Test]
-        public void Now()
+        [TestFixtureTearDown]
+        public void CleanupClass()
         {
-            var timespec = Timespec.Now;
+            GrpcEnvironment.Shutdown();
         }
 
         [Test]
-        public void InfFuture()
+        public void Constructor_RejectsInvalidParams()
         {
-            var timespec = Timespec.InfFuture;
+            Assert.Throws(typeof(NullReferenceException), () => new Channel(null, Credentials.Insecure));
         }
 
         [Test]
-        public void TimespecSizeIsNativeSize()
+        public void State_IdleAfterCreation()
         {
-            Assert.AreEqual(Timespec.NativeSize, Marshal.SizeOf(typeof(Timespec)));
-        }
-
-        [Test]
-        public void ToDateTime()
-        {
-            Assert.AreEqual(new DateTime(1970, 1, 1, 0, 0, 0, DateTimeKind.Utc),
-                new Timespec(IntPtr.Zero, 0).ToDateTime());
-
-            Assert.AreEqual(new DateTime(1970, 1, 1, 0, 0, 10, DateTimeKind.Utc).AddTicks(50),
-                new Timespec(new IntPtr(10), 5000).ToDateTime());
-
-            Assert.AreEqual(new DateTime(2015, 7, 21, 4, 21, 48, DateTimeKind.Utc),
-                new Timespec(new IntPtr(1437452508), 0).ToDateTime());
+            using (var channel = new Channel("localhost", Credentials.Insecure))
+            {
+                Assert.AreEqual(ChannelState.Idle, channel.State);
+            }
         }
 
         [Test]
-        public void Add()
+        public void WaitForStateChangedAsync_InvalidArgument()
         {
-            var t = new Timespec { tv_sec = new IntPtr(12345), tv_nsec = 123456789 };
-            var result = t.Add(TimeSpan.FromTicks(TimeSpan.TicksPerSecond * 10));
-            Assert.AreEqual(result.tv_sec, new IntPtr(12355));
-            Assert.AreEqual(result.tv_nsec, 123456789);
+            using (var channel = new Channel("localhost", Credentials.Insecure))
+            {
+                Assert.Throws(typeof(ArgumentException), () => channel.WaitForStateChangedAsync(ChannelState.FatalFailure));
+            }
         }
 
         [Test]
-        public void Add_Nanos()
+        public void Target()
         {
-            var t = new Timespec { tv_sec = new IntPtr(12345), tv_nsec = 123456789 };
-            var result = t.Add(TimeSpan.FromTicks(10));
-            Assert.AreEqual(result.tv_sec, new IntPtr(12345));
-            Assert.AreEqual(result.tv_nsec, 123456789 + 1000);
+            using (var channel = new Channel("127.0.0.1", Credentials.Insecure))
+            {
+                Assert.IsTrue(channel.Target.Contains("127.0.0.1"));
+            }
         }
 
         [Test]
-        public void Add_NanosOverflow()
+        public void Dispose_IsIdempotent()
         {
-            var t = new Timespec { tv_sec = new IntPtr(12345), tv_nsec = 999999999 };
-            var result = t.Add(TimeSpan.FromTicks(TimeSpan.TicksPerSecond * 10 + 10));
-            Assert.AreEqual(result.tv_sec, new IntPtr(12356));
-            Assert.AreEqual(result.tv_nsec, 999);
+            var channel = new Channel("localhost", Credentials.Insecure);
+            channel.Dispose();
+            channel.Dispose();
         }
     }
 }
diff --git a/src/csharp/Grpc.Core.Tests/ClientServerTest.cs b/src/csharp/Grpc.Core.Tests/ClientServerTest.cs
index 8ba2c8a9a2..64ea21800f 100644
--- a/src/csharp/Grpc.Core.Tests/ClientServerTest.cs
+++ b/src/csharp/Grpc.Core.Tests/ClientServerTest.cs
@@ -45,24 +45,27 @@ namespace Grpc.Core.Tests
 {
     public class ClientServerTest
     {
-        const string Host = "localhost";
-        const string ServiceName = "/tests.Test";
+        const string Host = "127.0.0.1";
+        const string ServiceName = "tests.Test";
 
         static readonly Method<string, string> EchoMethod = new Method<string, string>(
             MethodType.Unary,
-            "/tests.Test/Echo",
+            ServiceName,
+            "Echo",
             Marshallers.StringMarshaller,
             Marshallers.StringMarshaller);
 
         static readonly Method<string, string> ConcatAndEchoMethod = new Method<string, string>(
             MethodType.ClientStreaming,
-            "/tests.Test/ConcatAndEcho",
+            ServiceName,
+            "ConcatAndEcho",
             Marshallers.StringMarshaller,
             Marshallers.StringMarshaller);
 
         static readonly Method<string, string> NonexistentMethod = new Method<string, string>(
             MethodType.Unary,
-            "/tests.Test/NonexistentMethod",
+            ServiceName,
+            "NonexistentMethod",
             Marshallers.StringMarshaller,
             Marshallers.StringMarshaller);
 
@@ -77,11 +80,13 @@ namespace Grpc.Core.Tests
         [SetUp]
         public void Init()
         {
-            server = new Server();
-            server.AddServiceDefinition(ServiceDefinition);
-            int port = server.AddListeningPort(Host, Server.PickUnusedPort);
+            server = new Server
+            {
+                Services = { ServiceDefinition },
+                Ports = { { Host, ServerPort.PickUnused, ServerCredentials.Insecure } }
+            };
             server.Start();
-            channel = new Channel(Host, port);
+            channel = new Channel(Host, server.Ports.Single().BoundPort, Credentials.Insecure);
         }
 
         [TearDown]
@@ -100,17 +105,17 @@ namespace Grpc.Core.Tests
         [Test]
         public void UnaryCall()
         {
-            var internalCall = new Call<string, string>(ServiceName, EchoMethod, channel, Metadata.Empty);
-            Assert.AreEqual("ABC", Calls.BlockingUnaryCall(internalCall, "ABC", CancellationToken.None));
+            var callDetails = new CallInvocationDetails<string, string>(channel, EchoMethod, new CallOptions());
+            Assert.AreEqual("ABC", Calls.BlockingUnaryCall(callDetails, "ABC"));
         }
 
         [Test]
         public void UnaryCall_ServerHandlerThrows()
         {
-            var internalCall = new Call<string, string>(ServiceName, EchoMethod, channel, Metadata.Empty);
+            var callDetails = new CallInvocationDetails<string, string>(channel, EchoMethod, new CallOptions());
             try
             {
-                Calls.BlockingUnaryCall(internalCall, "THROW", CancellationToken.None);
+                Calls.BlockingUnaryCall(callDetails, "THROW");
                 Assert.Fail();
             }
             catch (RpcException e)
@@ -122,10 +127,10 @@ namespace Grpc.Core.Tests
         [Test]
         public void UnaryCall_ServerHandlerThrowsRpcException()
         {
-            var internalCall = new Call<string, string>(ServiceName, EchoMethod, channel, Metadata.Empty);
+            var callDetails = new CallInvocationDetails<string, string>(channel, EchoMethod, new CallOptions());
             try
             {
-                Calls.BlockingUnaryCall(internalCall, "THROW_UNAUTHENTICATED", CancellationToken.None);
+                Calls.BlockingUnaryCall(callDetails, "THROW_UNAUTHENTICATED");
                 Assert.Fail();
             }
             catch (RpcException e)
@@ -137,10 +142,10 @@ namespace Grpc.Core.Tests
         [Test]
         public void UnaryCall_ServerHandlerSetsStatus()
         {
-            var internalCall = new Call<string, string>(ServiceName, EchoMethod, channel, Metadata.Empty);
+            var callDetails = new CallInvocationDetails<string, string>(channel, EchoMethod, new CallOptions());
             try
             {
-                Calls.BlockingUnaryCall(internalCall, "SET_UNAUTHENTICATED", CancellationToken.None);
+                Calls.BlockingUnaryCall(callDetails, "SET_UNAUTHENTICATED");
                 Assert.Fail();
             }
             catch (RpcException e)
@@ -150,67 +155,57 @@ namespace Grpc.Core.Tests
         }
 
         [Test]
-        public void AsyncUnaryCall()
+        public async Task AsyncUnaryCall()
         {
-            var internalCall = new Call<string, string>(ServiceName, EchoMethod, channel, Metadata.Empty);
-            var result = Calls.AsyncUnaryCall(internalCall, "ABC", CancellationToken.None).ResponseAsync.Result;
+            var callDetails = new CallInvocationDetails<string, string>(channel, EchoMethod, new CallOptions());
+            var result = await Calls.AsyncUnaryCall(callDetails, "ABC");
             Assert.AreEqual("ABC", result);
         }
 
         [Test]
-        public void AsyncUnaryCall_ServerHandlerThrows()
+        public async Task AsyncUnaryCall_ServerHandlerThrows()
         {
-            Task.Run(async () =>
+            var callDetails = new CallInvocationDetails<string, string>(channel, EchoMethod, new CallOptions());
+            try
             {
-                var internalCall = new Call<string, string>(ServiceName, EchoMethod, channel, Metadata.Empty);
-                try
-                {
-                    await Calls.AsyncUnaryCall(internalCall, "THROW", CancellationToken.None);
-                    Assert.Fail();
-                }
-                catch (RpcException e)
-                {
-                    Assert.AreEqual(StatusCode.Unknown, e.Status.StatusCode);
-                }
-            }).Wait();
+                await Calls.AsyncUnaryCall(callDetails, "THROW");
+                Assert.Fail();
+            }
+            catch (RpcException e)
+            {
+                Assert.AreEqual(StatusCode.Unknown, e.Status.StatusCode);
+            }
         }
 
         [Test]
-        public void ClientStreamingCall()
+        public async Task ClientStreamingCall()
         {
-            Task.Run(async () => 
-            {
-                var internalCall = new Call<string, string>(ServiceName, ConcatAndEchoMethod, channel, Metadata.Empty);
-                var call = Calls.AsyncClientStreamingCall(internalCall, CancellationToken.None);
+            var callDetails = new CallInvocationDetails<string, string>(channel, ConcatAndEchoMethod, new CallOptions());
+            var call = Calls.AsyncClientStreamingCall(callDetails);
 
-                await call.RequestStream.WriteAll(new string[] { "A", "B", "C" });
-                Assert.AreEqual("ABC", await call.ResponseAsync);
-            }).Wait();
+            await call.RequestStream.WriteAll(new string[] { "A", "B", "C" });
+            Assert.AreEqual("ABC", await call.ResponseAsync);
         }
 
         [Test]
-        public void ClientStreamingCall_CancelAfterBegin()
+        public async Task ClientStreamingCall_CancelAfterBegin()
         {
-            Task.Run(async () => 
-            {
-                var internalCall = new Call<string, string>(ServiceName, ConcatAndEchoMethod, channel, Metadata.Empty);
+            var cts = new CancellationTokenSource();
+            var callDetails = new CallInvocationDetails<string, string>(channel, ConcatAndEchoMethod, new CallOptions(cancellationToken: cts.Token));
+            var call = Calls.AsyncClientStreamingCall(callDetails);
 
-                var cts = new CancellationTokenSource();
-                var call = Calls.AsyncClientStreamingCall(internalCall, cts.Token);
+            // TODO(jtattermusch): we need this to ensure call has been initiated once we cancel it.
+            await Task.Delay(1000);
+            cts.Cancel();
 
-                // TODO(jtattermusch): we need this to ensure call has been initiated once we cancel it.
-                await Task.Delay(1000);
-                cts.Cancel();
-
-                try
-                {
-                    await call.ResponseAsync;
-                }
-                catch (RpcException e)
-                {
-                    Assert.AreEqual(StatusCode.Cancelled, e.Status.StatusCode); 
-                }
-            }).Wait();
+            try
+            {
+                await call.ResponseAsync;
+            }
+            catch (RpcException e)
+            {
+                Assert.AreEqual(StatusCode.Cancelled, e.Status.StatusCode);
+            }
         }
 
         [Test]
@@ -218,11 +213,11 @@ namespace Grpc.Core.Tests
         {
             var headers = new Metadata
             {
-                new Metadata.Entry("asciiHeader", "abcdefg"),
-                new Metadata.Entry("binaryHeader-bin", new byte[] { 1, 2, 3, 0, 0xff }),
+                new Metadata.Entry("ascii-header", "abcdefg"),
+                new Metadata.Entry("binary-header-bin", new byte[] { 1, 2, 3, 0, 0xff }),
             };
-            var internalCall = new Call<string, string>(ServiceName, EchoMethod, channel, headers);
-            var call = Calls.AsyncUnaryCall(internalCall, "ABC", CancellationToken.None);
+            var callDetails = new CallInvocationDetails<string, string>(channel, EchoMethod, new CallOptions(headers: headers));
+            var call = Calls.AsyncUnaryCall(callDetails, "ABC");
 
             Assert.AreEqual("ABC", call.ResponseAsync.Result);
 
@@ -242,25 +237,25 @@ namespace Grpc.Core.Tests
         {
             channel.Dispose();
 
-            var internalCall = new Call<string, string>(ServiceName, EchoMethod, channel, Metadata.Empty);
-            Assert.Throws(typeof(ObjectDisposedException), () => Calls.BlockingUnaryCall(internalCall, "ABC", CancellationToken.None));
+            var callDetails = new CallInvocationDetails<string, string>(channel, EchoMethod, new CallOptions());
+            Assert.Throws(typeof(ObjectDisposedException), () => Calls.BlockingUnaryCall(callDetails, "ABC"));
         }
 
         [Test]
         public void UnaryCallPerformance()
         {
-            var internalCall = new Call<string, string>(ServiceName, EchoMethod, channel, Metadata.Empty);
+            var callDetails = new CallInvocationDetails<string, string>(channel, EchoMethod, new CallOptions());
             BenchmarkUtil.RunBenchmark(100, 100,
-                                       () => { Calls.BlockingUnaryCall(internalCall, "ABC", default(CancellationToken)); });
+                                       () => { Calls.BlockingUnaryCall(callDetails, "ABC"); });
         }
             
         [Test]
         public void UnknownMethodHandler()
         {
-            var internalCall = new Call<string, string>(ServiceName, NonexistentMethod, channel, Metadata.Empty);
+            var callDetails = new CallInvocationDetails<string, string>(channel, NonexistentMethod, new CallOptions());
             try
             {
-                Calls.BlockingUnaryCall(internalCall, "ABC", default(CancellationToken));
+                Calls.BlockingUnaryCall(callDetails, "ABC");
                 Assert.Fail();
             }
             catch (RpcException e)
@@ -272,11 +267,43 @@ namespace Grpc.Core.Tests
         [Test]
         public void UserAgentStringPresent()
         {
-            var internalCall = new Call<string, string>(ServiceName, EchoMethod, channel, Metadata.Empty);
-            string userAgent = Calls.BlockingUnaryCall(internalCall, "RETURN-USER-AGENT", CancellationToken.None);
+            var callDetails = new CallInvocationDetails<string, string>(channel, EchoMethod, new CallOptions());
+            string userAgent = Calls.BlockingUnaryCall(callDetails, "RETURN-USER-AGENT");
             Assert.IsTrue(userAgent.StartsWith("grpc-csharp/"));
         }
 
+        [Test]
+        public void PeerInfoPresent()
+        {
+            var callDetails = new CallInvocationDetails<string, string>(channel, EchoMethod, new CallOptions());
+            string peer = Calls.BlockingUnaryCall(callDetails, "RETURN-PEER");
+            Assert.IsTrue(peer.Contains(Host));
+        }
+
+        [Test]
+        public async Task Channel_WaitForStateChangedAsync()
+        {
+            Assert.Throws(typeof(TaskCanceledException), 
+                async () => await channel.WaitForStateChangedAsync(channel.State, DateTime.UtcNow.AddMilliseconds(10)));
+
+            var stateChangedTask = channel.WaitForStateChangedAsync(channel.State);
+
+            var callDetails = new CallInvocationDetails<string, string>(channel, EchoMethod, new CallOptions());
+            await Calls.AsyncUnaryCall(callDetails, "abc");
+
+            await stateChangedTask;
+            Assert.AreEqual(ChannelState.Ready, channel.State);
+        }
+
+        [Test]
+        public async Task Channel_ConnectAsync()
+        {
+            await channel.ConnectAsync();
+            Assert.AreEqual(ChannelState.Ready, channel.State);
+            await channel.ConnectAsync(DateTime.UtcNow.AddMilliseconds(1000));
+            Assert.AreEqual(ChannelState.Ready, channel.State);
+        }
+
         private static async Task<string> EchoHandler(string request, ServerCallContext context)
         {
             foreach (Metadata.Entry metadataEntry in context.RequestHeaders)
@@ -292,6 +319,11 @@ namespace Grpc.Core.Tests
                 return context.RequestHeaders.Where(entry => entry.Key == "user-agent").Single().Value;
             }
 
+            if (request == "RETURN-PEER")
+            {
+                return context.Peer;
+            }
+
             if (request == "THROW")
             {
                 throw new Exception("This was thrown on purpose by a test");
diff --git a/src/csharp/Grpc.Core.Tests/Grpc.Core.Tests.csproj b/src/csharp/Grpc.Core.Tests/Grpc.Core.Tests.csproj
index 927954c448..f2bf459dc5 100644
--- a/src/csharp/Grpc.Core.Tests/Grpc.Core.Tests.csproj
+++ b/src/csharp/Grpc.Core.Tests/Grpc.Core.Tests.csproj
@@ -17,20 +17,43 @@
     <DefineConstants>DEBUG;</DefineConstants>
     <ErrorReport>prompt</ErrorReport>
     <WarningLevel>4</WarningLevel>
-    <ConsolePause>false</ConsolePause>
   </PropertyGroup>
   <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Release|AnyCPU' ">
-    <DebugType>full</DebugType>
+    <DebugType>pdbonly</DebugType>
     <Optimize>true</Optimize>
     <OutputPath>bin\Release</OutputPath>
     <ErrorReport>prompt</ErrorReport>
     <WarningLevel>4</WarningLevel>
-    <ConsolePause>false</ConsolePause>
+  </PropertyGroup>
+  <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'ReleaseSigned|AnyCPU' ">
+    <DebugType>pdbonly</DebugType>
+    <Optimize>true</Optimize>
+    <OutputPath>bin\ReleaseSigned</OutputPath>
+    <ErrorReport>prompt</ErrorReport>
+    <WarningLevel>4</WarningLevel>
+    <SignAssembly>True</SignAssembly>
+    <AssemblyOriginatorKeyFile>C:\keys\Grpc.snk</AssemblyOriginatorKeyFile>
   </PropertyGroup>
   <ItemGroup>
+    <Reference Include="nunit.core">
+      <HintPath>..\packages\NUnitTestAdapter.2.0.0\lib\nunit.core.dll</HintPath>
+      <Private>False</Private>
+    </Reference>
+    <Reference Include="nunit.core.interfaces">
+      <HintPath>..\packages\NUnitTestAdapter.2.0.0\lib\nunit.core.interfaces.dll</HintPath>
+      <Private>False</Private>
+    </Reference>
     <Reference Include="nunit.framework">
       <HintPath>..\packages\NUnit.2.6.4\lib\nunit.framework.dll</HintPath>
     </Reference>
+    <Reference Include="nunit.util">
+      <HintPath>..\packages\NUnitTestAdapter.2.0.0\lib\nunit.util.dll</HintPath>
+      <Private>False</Private>
+    </Reference>
+    <Reference Include="NUnit.VisualStudio.TestAdapter">
+      <HintPath>..\packages\NUnitTestAdapter.2.0.0\lib\NUnit.VisualStudio.TestAdapter.dll</HintPath>
+      <Private>False</Private>
+    </Reference>
     <Reference Include="System" />
     <Reference Include="System.Interactive.Async">
       <HintPath>..\packages\Ix-Async.1.2.3\lib\net45\System.Interactive.Async.dll</HintPath>
@@ -44,13 +67,16 @@
     <Compile Include="ClientServerTest.cs" />
     <Compile Include="ServerTest.cs" />
     <Compile Include="GrpcEnvironmentTest.cs" />
-    <Compile Include="TimespecTest.cs" />
     <Compile Include="PInvokeTest.cs" />
     <Compile Include="Internal\MetadataArraySafeHandleTest.cs" />
     <Compile Include="Internal\CompletionQueueSafeHandleTest.cs" />
     <Compile Include="Internal\CompletionQueueEventTest.cs" />
     <Compile Include="Internal\ChannelArgsSafeHandleTest.cs" />
     <Compile Include="ChannelOptionsTest.cs" />
+    <Compile Include="Internal\TimespecTest.cs" />
+    <Compile Include="TimeoutsTest.cs" />
+    <Compile Include="NUnitVersionTest.cs" />
+    <Compile Include="ChannelTest.cs" />
   </ItemGroup>
   <Import Project="$(MSBuildBinPath)\Microsoft.CSharp.targets" />
   <ItemGroup>
@@ -60,7 +86,9 @@
     </ProjectReference>
   </ItemGroup>
   <ItemGroup>
-    <None Include="packages.config" />
+    <None Include="packages.config">
+      <SubType>Designer</SubType>
+    </None>
   </ItemGroup>
   <ItemGroup>
     <Service Include="{82A7F48D-3B50-4B1E-B82E-3ADA8210C358}" />
diff --git a/src/csharp/Grpc.Core.Tests/Internal/TimespecTest.cs b/src/csharp/Grpc.Core.Tests/Internal/TimespecTest.cs
new file mode 100644
index 0000000000..874df02baa
--- /dev/null
+++ b/src/csharp/Grpc.Core.Tests/Internal/TimespecTest.cs
@@ -0,0 +1,202 @@
+#region Copyright notice and license
+
+// Copyright 2015, Google Inc.
+// All rights reserved.
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+#endregion
+
+using System;
+using System.Runtime.InteropServices;
+using Grpc.Core.Internal;
+using NUnit.Framework;
+
+namespace Grpc.Core.Internal.Tests
+{
+    public class TimespecTest
+    {
+        [Test]
+        public void Now_IsInUtc() 
+        {
+            Assert.AreEqual(DateTimeKind.Utc, Timespec.Now.ToDateTime().Kind);
+        }
+
+        [Test]
+        public void Now_AgreesWithUtcNow()
+        {
+            var timespec = Timespec.Now;
+            var utcNow = DateTime.UtcNow;
+
+            TimeSpan difference = utcNow - timespec.ToDateTime();
+
+            // This test is inherently a race - but the two timestamps
+            // should really be way less that a minute apart.
+            Assert.IsTrue(difference.TotalSeconds < 60);
+        }
+
+        [Test]
+        public void InfFuture()
+        {
+            var timespec = Timespec.InfFuture;
+        }
+
+        [Test]
+        public void InfPast()
+        {
+            var timespec = Timespec.InfPast;
+        }
+
+        [Test]
+        public void TimespecSizeIsNativeSize()
+        {
+            Assert.AreEqual(Timespec.NativeSize, Marshal.SizeOf(typeof(Timespec)));
+        }
+
+        [Test]
+        public void ToDateTime()
+        {
+            Assert.AreEqual(new DateTime(1970, 1, 1, 0, 0, 0, DateTimeKind.Utc),
+                new Timespec(IntPtr.Zero, 0).ToDateTime());
+
+            Assert.AreEqual(new DateTime(1970, 1, 1, 0, 0, 10, DateTimeKind.Utc).AddTicks(50),
+                new Timespec(new IntPtr(10), 5000).ToDateTime());
+
+            Assert.AreEqual(new DateTime(2015, 7, 21, 4, 21, 48, DateTimeKind.Utc),
+                new Timespec(new IntPtr(1437452508), 0).ToDateTime());
+
+            // before epoch
+            Assert.AreEqual(new DateTime(1969, 12, 31, 23, 59, 55, DateTimeKind.Utc).AddTicks(10),
+                new Timespec(new IntPtr(-5), 1000).ToDateTime());
+
+            // infinity
+            Assert.AreEqual(DateTime.MaxValue, Timespec.InfFuture.ToDateTime());
+            Assert.AreEqual(DateTime.MinValue, Timespec.InfPast.ToDateTime());
+
+            // nanos are rounded to ticks are rounded up
+            Assert.AreEqual(new DateTime(1970, 1, 1, 0, 0, 0, DateTimeKind.Utc).AddTicks(1),
+                new Timespec(IntPtr.Zero, 99).ToDateTime());
+
+            // Illegal inputs
+            Assert.Throws(typeof(InvalidOperationException),
+                () => new Timespec(new IntPtr(0), -2).ToDateTime());
+            Assert.Throws(typeof(InvalidOperationException),
+                () => new Timespec(new IntPtr(0), 1000 * 1000 * 1000).ToDateTime());
+            Assert.Throws(typeof(InvalidOperationException),
+                () => new Timespec(new IntPtr(0), 0, GPRClockType.Monotonic).ToDateTime());
+        }
+
+        [Test]
+        public void ToDateTime_ReturnsUtc()
+        {
+            Assert.AreEqual(DateTimeKind.Utc, new Timespec(new IntPtr(1437452508), 0).ToDateTime().Kind);
+            Assert.AreNotEqual(DateTimeKind.Unspecified, new Timespec(new IntPtr(1437452508), 0).ToDateTime().Kind);
+        }
+
+        [Test]
+        public void ToDateTime_Overflow()
+        {
+            // we can only get overflow in ticks arithmetic on 64-bit
+            if (IntPtr.Size == 8)
+            {
+                var timespec = new Timespec(new IntPtr(long.MaxValue - 100), 0);
+                Assert.AreNotEqual(Timespec.InfFuture, timespec);
+                Assert.AreEqual(DateTime.MaxValue, timespec.ToDateTime());
+
+                Assert.AreEqual(DateTime.MinValue, new Timespec(new IntPtr(long.MinValue + 100), 0).ToDateTime());
+            }
+            else
+            {
+                Console.WriteLine("Test cannot be run on this platform, skipping the test.");
+            }
+        }
+
+        [Test]
+        public void ToDateTime_OutOfDateTimeRange()
+        {
+            // we can only get out of range on 64-bit, on 32 bit the max 
+            // timestamp is ~ Jan 19 2038, which is far within range of DateTime
+            // same case for min value.
+            if (IntPtr.Size == 8)
+            {
+                // DateTime range goes up to year 9999, 20000 years from now should
+                // be out of range.
+                long seconds = 20000L * 365L * 24L * 3600L; 
+
+                var timespec = new Timespec(new IntPtr(seconds), 0);
+                Assert.AreNotEqual(Timespec.InfFuture, timespec);
+                Assert.AreEqual(DateTime.MaxValue, timespec.ToDateTime());
+
+                Assert.AreEqual(DateTime.MinValue, new Timespec(new IntPtr(-seconds), 0).ToDateTime());
+            }
+            else
+            {
+                Console.WriteLine("Test cannot be run on this platform, skipping the test");
+            }
+        }
+
+        [Test]
+        public void FromDateTime()
+        {
+            Assert.AreEqual(new Timespec(IntPtr.Zero, 0),
+                Timespec.FromDateTime(new DateTime(1970, 1, 1, 0, 0, 0, DateTimeKind.Utc)));
+
+            Assert.AreEqual(new Timespec(new IntPtr(10), 5000),
+                Timespec.FromDateTime(new DateTime(1970, 1, 1, 0, 0, 10, DateTimeKind.Utc).AddTicks(50)));
+
+            Assert.AreEqual(new Timespec(new IntPtr(1437452508), 0),
+                Timespec.FromDateTime(new DateTime(2015, 7, 21, 4, 21, 48, DateTimeKind.Utc)));
+
+            // before epoch
+            Assert.AreEqual(new Timespec(new IntPtr(-5), 1000),
+                Timespec.FromDateTime(new DateTime(1969, 12, 31, 23, 59, 55, DateTimeKind.Utc).AddTicks(10)));
+
+            // infinity
+            Assert.AreEqual(Timespec.InfFuture, Timespec.FromDateTime(DateTime.MaxValue));
+            Assert.AreEqual(Timespec.InfPast, Timespec.FromDateTime(DateTime.MinValue));
+
+            // illegal inputs
+            Assert.Throws(typeof(ArgumentException),
+                () => Timespec.FromDateTime(new DateTime(1970, 1, 1, 0, 0, 0, DateTimeKind.Unspecified)));
+        }
+
+        [Test]
+        public void FromDateTime_OutOfTimespecRange()
+        {
+            // we can only get overflow in Timespec on 32-bit
+            if (IntPtr.Size == 4)
+            {
+                Assert.AreEqual(Timespec.InfFuture, Timespec.FromDateTime(new DateTime(2040, 1, 1, 0, 0, 0, DateTimeKind.Utc)));
+                Assert.AreEqual(Timespec.InfPast, Timespec.FromDateTime(new DateTime(1800, 1, 1, 0, 0, 0, DateTimeKind.Utc)));
+            }
+            else
+            {
+                Console.WriteLine("Test cannot be run on this platform, skipping the test.");
+            }
+        }
+    }
+}
diff --git a/src/csharp/Grpc.Core.Tests/NUnitVersionTest.cs b/src/csharp/Grpc.Core.Tests/NUnitVersionTest.cs
new file mode 100644
index 0000000000..3fa6ad09c0
--- /dev/null
+++ b/src/csharp/Grpc.Core.Tests/NUnitVersionTest.cs
@@ -0,0 +1,77 @@
+#region Copyright notice and license
+
+// Copyright 2015, Google Inc.
+// All rights reserved.
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+#endregion
+
+using System;
+using System.Threading;
+using System.Threading.Tasks;
+using Grpc.Core;
+using Grpc.Core.Internal;
+using Grpc.Core.Utils;
+using NUnit.Framework;
+
+namespace Grpc.Core.Tests
+{
+    /// <summary>
+    /// Tests if the version of nunit-console used is sufficient to run async tests.
+    /// </summary>
+    public class NUnitVersionTest
+    {
+        private int testRunCount = 0;
+
+        [TestFixtureTearDown]
+        public void Cleanup()
+        {
+            if (testRunCount != 2)
+            {
+                Console.Error.WriteLine("You are using and old version of NUnit that doesn't support async tests and skips them instead. " +
+                "This test has failed to indicate that.");
+                Console.Error.Flush();
+                Environment.Exit(1);
+            }
+        }
+
+        [Test]
+        public void NUnitVersionTest1()
+        {
+            testRunCount++;
+        }
+
+        // Old version of NUnit will skip this test
+        [Test]
+        public async Task NUnitVersionTest2()
+        {
+            testRunCount++;
+            await Task.Delay(10);
+        }
+    }
+}
diff --git a/src/csharp/Grpc.Core.Tests/ServerTest.cs b/src/csharp/Grpc.Core.Tests/ServerTest.cs
index 1119aa370e..485006ebac 100644
--- a/src/csharp/Grpc.Core.Tests/ServerTest.cs
+++ b/src/csharp/Grpc.Core.Tests/ServerTest.cs
@@ -32,6 +32,7 @@
 #endregion
 
 using System;
+using System.Linq;
 using Grpc.Core;
 using Grpc.Core.Internal;
 using Grpc.Core.Utils;
@@ -44,11 +45,45 @@ namespace Grpc.Core.Tests
         [Test]
         public void StartAndShutdownServer()
         {
-            Server server = new Server();
-            server.AddListeningPort("localhost", Server.PickUnusedPort);
+            Server server = new Server
+            {
+                Ports = { new ServerPort("localhost", ServerPort.PickUnused, ServerCredentials.Insecure) }
+            };
             server.Start();
             server.ShutdownAsync().Wait();
             GrpcEnvironment.Shutdown();
         }
+
+        [Test]
+        public void PickUnusedPort()
+        {
+            Server server = new Server
+            {
+                Ports = { new ServerPort("localhost", ServerPort.PickUnused, ServerCredentials.Insecure) }
+            };
+
+            var boundPort = server.Ports.Single();
+            Assert.AreEqual(0, boundPort.Port);
+            Assert.Greater(boundPort.BoundPort, 0);
+
+            server.Start();
+            server.ShutdownAsync();
+            GrpcEnvironment.Shutdown();
+        }
+
+        [Test]
+        public void CannotModifyAfterStarted()
+        {
+            Server server = new Server
+            {
+                Ports = { new ServerPort("localhost", ServerPort.PickUnused, ServerCredentials.Insecure) }
+            };
+            server.Start();
+            Assert.Throws(typeof(InvalidOperationException), () => server.Ports.Add("localhost", 9999, ServerCredentials.Insecure));
+            Assert.Throws(typeof(InvalidOperationException), () => server.Services.Add(ServerServiceDefinition.CreateBuilder("serviceName").Build()));
+
+            server.ShutdownAsync().Wait();
+            GrpcEnvironment.Shutdown();
+        }
     }
 }
diff --git a/src/csharp/Grpc.Core.Tests/TimeoutsTest.cs b/src/csharp/Grpc.Core.Tests/TimeoutsTest.cs
new file mode 100644
index 0000000000..fc395b0acd
--- /dev/null
+++ b/src/csharp/Grpc.Core.Tests/TimeoutsTest.cs
@@ -0,0 +1,212 @@
+#region Copyright notice and license
+
+// Copyright 2015, Google Inc.
+// All rights reserved.
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+#endregion
+
+using System;
+using System.Diagnostics;
+using System.Linq;
+using System.Threading;
+using System.Threading.Tasks;
+using Grpc.Core;
+using Grpc.Core.Internal;
+using Grpc.Core.Utils;
+using NUnit.Framework;
+
+namespace Grpc.Core.Tests
+{
+    /// <summary>
+    /// Tests for Deadline support.
+    /// </summary>
+    public class TimeoutsTest
+    {
+        const string Host = "localhost";
+        const string ServiceName = "tests.Test";
+
+        static readonly Method<string, string> TestMethod = new Method<string, string>(
+            MethodType.Unary,
+            ServiceName,
+            "Test",
+            Marshallers.StringMarshaller,
+            Marshallers.StringMarshaller);
+
+        static readonly ServerServiceDefinition ServiceDefinition = ServerServiceDefinition.CreateBuilder(ServiceName)
+            .AddMethod(TestMethod, TestMethodHandler)
+            .Build();
+
+        // provides a way how to retrieve an out-of-band result value from server handler
+        static TaskCompletionSource<string> stringFromServerHandlerTcs;
+
+        Server server;
+        Channel channel;
+
+        [SetUp]
+        public void Init()
+        {
+            server = new Server
+            {
+                Services = { ServiceDefinition },
+                Ports = { { Host, ServerPort.PickUnused, ServerCredentials.Insecure } }
+            };
+            server.Start();
+            channel = new Channel(Host, server.Ports.Single().BoundPort, Credentials.Insecure);
+
+            stringFromServerHandlerTcs = new TaskCompletionSource<string>();
+        }
+
+        [TearDown]
+        public void Cleanup()
+        {
+            channel.Dispose();
+            server.ShutdownAsync().Wait();
+        }
+
+        [TestFixtureTearDown]
+        public void CleanupClass()
+        {
+            GrpcEnvironment.Shutdown();
+        }
+
+        [Test]
+        public void InfiniteDeadline()
+        {
+            // no deadline specified, check server sees infinite deadline
+            var callDetails = new CallInvocationDetails<string, string>(channel, TestMethod, new CallOptions());
+            Assert.AreEqual("DATETIME_MAXVALUE", Calls.BlockingUnaryCall(callDetails, "RETURN_DEADLINE"));
+
+            // DateTime.MaxValue deadline specified, check server sees infinite deadline
+            var callDetails2 = new CallInvocationDetails<string, string>(channel, TestMethod, new CallOptions());
+            Assert.AreEqual("DATETIME_MAXVALUE", Calls.BlockingUnaryCall(callDetails2, "RETURN_DEADLINE"));
+        }
+
+        [Test]
+        public void DeadlineTransferredToServer()
+        {
+            var remainingTimeClient = TimeSpan.FromDays(7);
+            var deadline = DateTime.UtcNow + remainingTimeClient;
+            Thread.Sleep(1000);
+            var callDetails = new CallInvocationDetails<string, string>(channel, TestMethod, new CallOptions(deadline: deadline));
+
+            var serverDeadlineTicksString = Calls.BlockingUnaryCall(callDetails, "RETURN_DEADLINE");
+            var serverDeadline = new DateTime(long.Parse(serverDeadlineTicksString), DateTimeKind.Utc);
+
+            // A fairly relaxed check that the deadline set by client and deadline seen by server
+            // are in agreement. C core takes care of the work with transferring deadline over the wire,
+            // so we don't need an exact check here.
+            Assert.IsTrue(Math.Abs((deadline - serverDeadline).TotalMilliseconds) < 5000);
+        }
+
+        [Test]
+        public void DeadlineInThePast()
+        {
+            var callDetails = new CallInvocationDetails<string, string>(channel, TestMethod, new CallOptions(deadline: DateTime.MinValue));
+
+            try
+            {
+                Calls.BlockingUnaryCall(callDetails, "TIMEOUT");
+                Assert.Fail();
+            }
+            catch (RpcException e)
+            {
+                // We can't guarantee the status code always DeadlineExceeded. See issue #2685.
+                Assert.Contains(e.Status.StatusCode, new[] { StatusCode.DeadlineExceeded, StatusCode.Internal });
+            }
+        }
+
+        [Test]
+        public void DeadlineExceededStatusOnTimeout()
+        {
+            var deadline = DateTime.UtcNow.Add(TimeSpan.FromSeconds(5));
+            var callDetails = new CallInvocationDetails<string, string>(channel, TestMethod, new CallOptions(deadline: deadline));
+
+            try
+            {
+                Calls.BlockingUnaryCall(callDetails, "TIMEOUT");
+                Assert.Fail();
+            }
+            catch (RpcException e)
+            {
+                // We can't guarantee the status code always DeadlineExceeded. See issue #2685.
+                Assert.Contains(e.Status.StatusCode, new[] { StatusCode.DeadlineExceeded, StatusCode.Internal });
+            }
+        }
+
+        [Test]
+        public void ServerReceivesCancellationOnTimeout()
+        {
+            var deadline = DateTime.UtcNow.Add(TimeSpan.FromSeconds(5));
+            var callDetails = new CallInvocationDetails<string, string>(channel, TestMethod, new CallOptions(deadline: deadline));
+
+            try
+            {
+                Calls.BlockingUnaryCall(callDetails, "CHECK_CANCELLATION_RECEIVED");
+                Assert.Fail();
+            }
+            catch (RpcException e)
+            {
+                // We can't guarantee the status code is always DeadlineExceeded. See issue #2685.
+                Assert.Contains(e.Status.StatusCode, new[] { StatusCode.DeadlineExceeded, StatusCode.Internal });
+            }
+            Assert.AreEqual("CANCELLED", stringFromServerHandlerTcs.Task.Result);
+        }
+            
+        private static async Task<string> TestMethodHandler(string request, ServerCallContext context)
+        {
+            if (request == "TIMEOUT")
+            {
+                await Task.Delay(60000);
+                return "";
+            }
+
+            if (request == "RETURN_DEADLINE")
+            {
+                if (context.Deadline == DateTime.MaxValue)
+                {
+                    return "DATETIME_MAXVALUE";
+                }
+
+                return context.Deadline.Ticks.ToString();
+            }
+
+            if (request == "CHECK_CANCELLATION_RECEIVED")
+            {
+                // wait until cancellation token is fired.
+                var tcs = new TaskCompletionSource<object>();
+                context.CancellationToken.Register(() => { tcs.SetResult(null); });
+                await tcs.Task;
+                stringFromServerHandlerTcs.SetResult("CANCELLED");
+                return "";
+            }
+
+            return "";
+        }
+    }
+}
diff --git a/src/csharp/Grpc.Core.Tests/packages.config b/src/csharp/Grpc.Core.Tests/packages.config
index 28af8d78c6..62077f41be 100644
--- a/src/csharp/Grpc.Core.Tests/packages.config
+++ b/src/csharp/Grpc.Core.Tests/packages.config
@@ -2,4 +2,5 @@
 <packages>
   <package id="Ix-Async" version="1.2.3" targetFramework="net45" />
   <package id="NUnit" version="2.6.4" targetFramework="net45" />
+  <package id="NUnitTestAdapter" version="2.0.0" targetFramework="net45" />
 </packages>
\ No newline at end of file
diff --git a/src/csharp/Grpc.Core/Call.cs b/src/csharp/Grpc.Core/CallInvocationDetails.cs
index 37b452f020..eb23a3a209 100644
--- a/src/csharp/Grpc.Core/Call.cs
+++ b/src/csharp/Grpc.Core/CallInvocationDetails.cs
@@ -38,23 +38,30 @@ using Grpc.Core.Utils;
 namespace Grpc.Core
 {
     /// <summary>
-    /// Abstraction of a call to be invoked on a client.
+    /// Details about a client-side call to be invoked.
     /// </summary>
-    public class Call<TRequest, TResponse>
+    public class CallInvocationDetails<TRequest, TResponse>
     {
-        readonly string name;
+        readonly Channel channel;
+        readonly string method;
+        readonly string host;
         readonly Marshaller<TRequest> requestMarshaller;
         readonly Marshaller<TResponse> responseMarshaller;
-        readonly Channel channel;
-        readonly Metadata headers;
+        readonly CallOptions options;
+
+        public CallInvocationDetails(Channel channel, Method<TRequest, TResponse> method, CallOptions options) :
+            this(channel, method.FullName, null, method.RequestMarshaller, method.ResponseMarshaller, options)
+        {
+        }
 
-        public Call(string serviceName, Method<TRequest, TResponse> method, Channel channel, Metadata headers)
+        public CallInvocationDetails(Channel channel, string method, string host, Marshaller<TRequest> requestMarshaller, Marshaller<TResponse> responseMarshaller, CallOptions options)
         {
-            this.name = method.GetFullName(serviceName);
-            this.requestMarshaller = method.RequestMarshaller;
-            this.responseMarshaller = method.ResponseMarshaller;
             this.channel = Preconditions.CheckNotNull(channel);
-            this.headers = Preconditions.CheckNotNull(headers);
+            this.method = Preconditions.CheckNotNull(method);
+            this.host = host;
+            this.requestMarshaller = Preconditions.CheckNotNull(requestMarshaller);
+            this.responseMarshaller = Preconditions.CheckNotNull(responseMarshaller);
+            this.options = Preconditions.CheckNotNull(options);
         }
 
         public Channel Channel
@@ -65,25 +72,19 @@ namespace Grpc.Core
             }
         }
 
-        /// <summary>
-        /// Full methods name including the service name.
-        /// </summary>
-        public string Name
+        public string Method
         {
             get
             {
-                return name;
+                return this.method;
             }
         }
 
-        /// <summary>
-        /// Headers to send at the beginning of the call.
-        /// </summary>
-        public Metadata Headers
+        public string Host
         {
             get
             {
-                return headers;
+                return this.host;
             }
         }
 
@@ -91,7 +92,7 @@ namespace Grpc.Core
         {
             get
             {
-                return requestMarshaller;
+                return this.requestMarshaller;
             }
         }
 
@@ -99,7 +100,15 @@ namespace Grpc.Core
         {
             get
             {
-                return responseMarshaller;
+                return this.responseMarshaller;
+            }
+        }
+            
+        public CallOptions Options
+        {
+            get
+            {
+                return options;
             }
         }
     }
diff --git a/src/csharp/Grpc.Core/CallOptions.cs b/src/csharp/Grpc.Core/CallOptions.cs
new file mode 100644
index 0000000000..8e9739335f
--- /dev/null
+++ b/src/csharp/Grpc.Core/CallOptions.cs
@@ -0,0 +1,89 @@
+#region Copyright notice and license
+
+// Copyright 2015, Google Inc.
+// All rights reserved.
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+#endregion
+
+using System;
+using System.Threading;
+
+using Grpc.Core.Internal;
+using Grpc.Core.Utils;
+
+namespace Grpc.Core
+{
+    /// <summary>
+    /// Options for calls made by client.
+    /// </summary>
+    public class CallOptions
+    {
+        readonly Metadata headers;
+        readonly DateTime deadline;
+        readonly CancellationToken cancellationToken;
+
+        /// <summary>
+        /// Creates a new instance of <c>CallOptions</c>.
+        /// </summary>
+        /// <param name="headers">Headers to be sent with the call.</param>
+        /// <param name="deadline">Deadline for the call to finish. null means no deadline.</param>
+        /// <param name="cancellationToken">Can be used to request cancellation of the call.</param>
+        public CallOptions(Metadata headers = null, DateTime? deadline = null, CancellationToken cancellationToken = default(CancellationToken))
+        {
+            // TODO(jtattermusch): consider only creating metadata object once it's really needed.
+            this.headers = headers != null ? headers : new Metadata();
+            this.deadline = deadline.HasValue ? deadline.Value : DateTime.MaxValue;
+            this.cancellationToken = cancellationToken;
+        }
+
+        /// <summary>
+        /// Headers to send at the beginning of the call.
+        /// </summary>
+        public Metadata Headers
+        {
+            get { return headers; }
+        }
+
+        /// <summary>
+        /// Call deadline.
+        /// </summary>
+        public DateTime Deadline
+        {
+            get { return deadline; }
+        }
+
+        /// <summary>
+        /// Token that can be used for cancelling the call.
+        /// </summary>
+        public CancellationToken CancellationToken
+        {
+            get { return cancellationToken; }
+        }
+    }
+}
diff --git a/src/csharp/Grpc.Core/Calls.cs b/src/csharp/Grpc.Core/Calls.cs
index 359fe53741..00a8cabf82 100644
--- a/src/csharp/Grpc.Core/Calls.cs
+++ b/src/csharp/Grpc.Core/Calls.cs
@@ -43,70 +43,52 @@ namespace Grpc.Core
     /// </summary>
     public static class Calls
     {
-        public static TResponse BlockingUnaryCall<TRequest, TResponse>(Call<TRequest, TResponse> call, TRequest req, CancellationToken token)
+        public static TResponse BlockingUnaryCall<TRequest, TResponse>(CallInvocationDetails<TRequest, TResponse> call, TRequest req)
             where TRequest : class
             where TResponse : class
         {
-            var asyncCall = new AsyncCall<TRequest, TResponse>(call.RequestMarshaller.Serializer, call.ResponseMarshaller.Deserializer);
-            // TODO(jtattermusch): this gives a race that cancellation can be requested before the call even starts.
-            RegisterCancellationCallback(asyncCall, token);
-            return asyncCall.UnaryCall(call.Channel, call.Name, req, call.Headers);
+            var asyncCall = new AsyncCall<TRequest, TResponse>(call);
+            return asyncCall.UnaryCall(req);
         }
 
-        public static AsyncUnaryCall<TResponse> AsyncUnaryCall<TRequest, TResponse>(Call<TRequest, TResponse> call, TRequest req, CancellationToken token)
+        public static AsyncUnaryCall<TResponse> AsyncUnaryCall<TRequest, TResponse>(CallInvocationDetails<TRequest, TResponse> call, TRequest req)
             where TRequest : class
             where TResponse : class
         {
-            var asyncCall = new AsyncCall<TRequest, TResponse>(call.RequestMarshaller.Serializer, call.ResponseMarshaller.Deserializer);
-            asyncCall.Initialize(call.Channel, call.Channel.CompletionQueue, call.Name);
-            var asyncResult = asyncCall.UnaryCallAsync(req, call.Headers);
-            RegisterCancellationCallback(asyncCall, token);
+            var asyncCall = new AsyncCall<TRequest, TResponse>(call);
+            var asyncResult = asyncCall.UnaryCallAsync(req);
             return new AsyncUnaryCall<TResponse>(asyncResult, asyncCall.GetStatus, asyncCall.GetTrailers, asyncCall.Cancel);
         }
 
-        public static AsyncServerStreamingCall<TResponse> AsyncServerStreamingCall<TRequest, TResponse>(Call<TRequest, TResponse> call, TRequest req, CancellationToken token)
+        public static AsyncServerStreamingCall<TResponse> AsyncServerStreamingCall<TRequest, TResponse>(CallInvocationDetails<TRequest, TResponse> call, TRequest req)
             where TRequest : class
             where TResponse : class
         {
-            var asyncCall = new AsyncCall<TRequest, TResponse>(call.RequestMarshaller.Serializer, call.ResponseMarshaller.Deserializer);
-            asyncCall.Initialize(call.Channel, call.Channel.CompletionQueue, call.Name);
-            asyncCall.StartServerStreamingCall(req, call.Headers);
-            RegisterCancellationCallback(asyncCall, token);
+            var asyncCall = new AsyncCall<TRequest, TResponse>(call);
+            asyncCall.StartServerStreamingCall(req);
             var responseStream = new ClientResponseStream<TRequest, TResponse>(asyncCall);
             return new AsyncServerStreamingCall<TResponse>(responseStream, asyncCall.GetStatus, asyncCall.GetTrailers, asyncCall.Cancel);
         }
 
-        public static AsyncClientStreamingCall<TRequest, TResponse> AsyncClientStreamingCall<TRequest, TResponse>(Call<TRequest, TResponse> call, CancellationToken token)
+        public static AsyncClientStreamingCall<TRequest, TResponse> AsyncClientStreamingCall<TRequest, TResponse>(CallInvocationDetails<TRequest, TResponse> call)
             where TRequest : class
             where TResponse : class
         {
-            var asyncCall = new AsyncCall<TRequest, TResponse>(call.RequestMarshaller.Serializer, call.ResponseMarshaller.Deserializer);
-            asyncCall.Initialize(call.Channel, call.Channel.CompletionQueue, call.Name);
-            var resultTask = asyncCall.ClientStreamingCallAsync(call.Headers);
-            RegisterCancellationCallback(asyncCall, token);
+            var asyncCall = new AsyncCall<TRequest, TResponse>(call);
+            var resultTask = asyncCall.ClientStreamingCallAsync();
             var requestStream = new ClientRequestStream<TRequest, TResponse>(asyncCall);
             return new AsyncClientStreamingCall<TRequest, TResponse>(requestStream, resultTask, asyncCall.GetStatus, asyncCall.GetTrailers, asyncCall.Cancel);
         }
 
-        public static AsyncDuplexStreamingCall<TRequest, TResponse> AsyncDuplexStreamingCall<TRequest, TResponse>(Call<TRequest, TResponse> call, CancellationToken token)
+        public static AsyncDuplexStreamingCall<TRequest, TResponse> AsyncDuplexStreamingCall<TRequest, TResponse>(CallInvocationDetails<TRequest, TResponse> call)
             where TRequest : class
             where TResponse : class
         {
-            var asyncCall = new AsyncCall<TRequest, TResponse>(call.RequestMarshaller.Serializer, call.ResponseMarshaller.Deserializer);
-            asyncCall.Initialize(call.Channel, call.Channel.CompletionQueue, call.Name);
-            asyncCall.StartDuplexStreamingCall(call.Headers);
-            RegisterCancellationCallback(asyncCall, token);
+            var asyncCall = new AsyncCall<TRequest, TResponse>(call);
+            asyncCall.StartDuplexStreamingCall();
             var requestStream = new ClientRequestStream<TRequest, TResponse>(asyncCall);
             var responseStream = new ClientResponseStream<TRequest, TResponse>(asyncCall);
             return new AsyncDuplexStreamingCall<TRequest, TResponse>(requestStream, responseStream, asyncCall.GetStatus, asyncCall.GetTrailers, asyncCall.Cancel);
         }
-
-        private static void RegisterCancellationCallback<TRequest, TResponse>(AsyncCall<TRequest, TResponse> asyncCall, CancellationToken token)
-        {
-            if (token.CanBeCanceled)
-            {
-                token.Register(() => asyncCall.Cancel());
-            }
-        }
     }
 }
diff --git a/src/csharp/Grpc.Core/Channel.cs b/src/csharp/Grpc.Core/Channel.cs
index e5c6abd2cb..9273ea4582 100644
--- a/src/csharp/Grpc.Core/Channel.cs
+++ b/src/csharp/Grpc.Core/Channel.cs
@@ -37,6 +37,8 @@ using System.Threading;
 using System.Threading.Tasks;
 
 using Grpc.Core.Internal;
+using Grpc.Core.Logging;
+using Grpc.Core.Utils;
 
 namespace Grpc.Core
 {
@@ -45,89 +47,134 @@ namespace Grpc.Core
     /// </summary>
     public class Channel : IDisposable
     {
+        static readonly ILogger Logger = GrpcEnvironment.Logger.ForType<Channel>();
+
         readonly GrpcEnvironment environment;
         readonly ChannelSafeHandle handle;
         readonly List<ChannelOption> options;
-        readonly string target;
         bool disposed;
 
         /// <summary>
         /// Creates a channel that connects to a specific host.
-        /// Port will default to 80 for an unsecure channel and to 443 a secure channel.
+        /// Port will default to 80 for an unsecure channel and to 443 for a secure channel.
         /// </summary>
-        /// <param name="host">The DNS name of IP address of the host.</param>
-        /// <param name="credentials">Optional credentials to create a secure channel.</param>
+        /// <param name="host">The name or IP address of the host.</param>
+        /// <param name="credentials">Credentials to secure the channel.</param>
         /// <param name="options">Channel options.</param>
-        public Channel(string host, Credentials credentials = null, IEnumerable<ChannelOption> options = null)
+        public Channel(string host, Credentials credentials, IEnumerable<ChannelOption> options = null)
         {
+            Preconditions.CheckNotNull(host);
             this.environment = GrpcEnvironment.GetInstance();
             this.options = options != null ? new List<ChannelOption>(options) : new List<ChannelOption>();
 
             EnsureUserAgentChannelOption(this.options);
+            using (CredentialsSafeHandle nativeCredentials = credentials.ToNativeCredentials())
             using (ChannelArgsSafeHandle nativeChannelArgs = ChannelOptions.CreateChannelArgs(this.options))
             {
-                if (credentials != null)
+                if (nativeCredentials != null)
                 {
-                    using (CredentialsSafeHandle nativeCredentials = credentials.ToNativeCredentials())
-                    {
-                        this.handle = ChannelSafeHandle.CreateSecure(nativeCredentials, host, nativeChannelArgs);
-                    }
+                    this.handle = ChannelSafeHandle.CreateSecure(nativeCredentials, host, nativeChannelArgs);
                 }
                 else
                 {
-                    this.handle = ChannelSafeHandle.Create(host, nativeChannelArgs);
+                    this.handle = ChannelSafeHandle.CreateInsecure(host, nativeChannelArgs);
                 }
             }
-            this.target = GetOverridenTarget(host, this.options);
         }
 
         /// <summary>
         /// Creates a channel that connects to a specific host and port.
         /// </summary>
-        /// <param name="host">DNS name or IP address</param>
-        /// <param name="port">the port</param>
-        /// <param name="credentials">Optional credentials to create a secure channel.</param>
+        /// <param name="host">The name or IP address of the host.</param>
+        /// <param name="port">The port.</param>
+        /// <param name="credentials">Credentials to secure the channel.</param>
         /// <param name="options">Channel options.</param>
-        public Channel(string host, int port, Credentials credentials = null, IEnumerable<ChannelOption> options = null) :
+        public Channel(string host, int port, Credentials credentials, IEnumerable<ChannelOption> options = null) :
             this(string.Format("{0}:{1}", host, port), credentials, options)
         {
         }
 
-        public void Dispose()
+        /// <summary>
+        /// Gets current connectivity state of this channel.
+        /// </summary>
+        public ChannelState State
         {
-            Dispose(true);
-            GC.SuppressFinalize(this);
+            get
+            {
+                return handle.CheckConnectivityState(false);        
+            }
         }
 
-        internal string Target
+        /// <summary>
+        /// Returned tasks completes once channel state has become different from 
+        /// given lastObservedState. 
+        /// If deadline is reached or and error occurs, returned task is cancelled.
+        /// </summary>
+        public Task WaitForStateChangedAsync(ChannelState lastObservedState, DateTime? deadline = null)
         {
-            get
+            Preconditions.CheckArgument(lastObservedState != ChannelState.FatalFailure,
+                "FatalFailure is a terminal state. No further state changes can occur.");
+            var tcs = new TaskCompletionSource<object>();
+            var deadlineTimespec = deadline.HasValue ? Timespec.FromDateTime(deadline.Value) : Timespec.InfFuture;
+            var handler = new BatchCompletionDelegate((success, ctx) =>
             {
-                return target;
-            }
+                if (success)
+                {
+                    tcs.SetResult(null);
+                }
+                else
+                {
+                    tcs.SetCanceled();
+                }
+            });
+            handle.WatchConnectivityState(lastObservedState, deadlineTimespec, environment.CompletionQueue, environment.CompletionRegistry, handler);
+            return tcs.Task;
         }
 
-        internal ChannelSafeHandle Handle
+        /// <summary> Address of the remote endpoint in URI format.</summary>
+        public string Target
         {
             get
             {
-                return this.handle;
+                return handle.GetTarget();
             }
         }
 
-        internal CompletionQueueSafeHandle CompletionQueue
+        /// <summary>
+        /// Allows explicitly requesting channel to connect without starting an RPC.
+        /// Returned task completes once state Ready was seen. If the deadline is reached,
+        /// or channel enters the FatalFailure state, the task is cancelled.
+        /// There is no need to call this explicitly unless your use case requires that.
+        /// Starting an RPC on a new channel will request connection implicitly.
+        /// </summary>
+        public async Task ConnectAsync(DateTime? deadline = null)
         {
-            get
+            var currentState = handle.CheckConnectivityState(true);
+            while (currentState != ChannelState.Ready)
             {
-                return this.environment.CompletionQueue;
+                if (currentState == ChannelState.FatalFailure)
+                {
+                    throw new OperationCanceledException("Channel has reached FatalFailure state.");
+                }
+                await WaitForStateChangedAsync(currentState, deadline);
+                currentState = handle.CheckConnectivityState(false);
             }
         }
 
-        internal CompletionRegistry CompletionRegistry
+        /// <summary>
+        /// Destroys the underlying channel.
+        /// </summary>
+        public void Dispose()
+        {
+            Dispose(true);
+            GC.SuppressFinalize(this);
+        }
+
+        internal ChannelSafeHandle Handle
         {
             get
             {
-                return this.environment.CompletionRegistry;
+                return this.handle;
             }
         }
 
@@ -161,26 +208,5 @@ namespace Grpc.Core
             // TODO(jtattermusch): it would be useful to also provide .NET/mono version.
             return string.Format("grpc-csharp/{0}", VersionInfo.CurrentVersion);
         }
-
-        /// <summary>
-        /// Look for SslTargetNameOverride option and return its value instead of originalTarget
-        /// if found.
-        /// </summary>
-        private static string GetOverridenTarget(string originalTarget, IEnumerable<ChannelOption> options)
-        {
-            if (options == null)
-            {
-                return originalTarget;
-            }
-            foreach (var option in options)
-            {
-                if (option.Type == ChannelOption.OptionType.String
-                    && option.Name == ChannelOptions.SslTargetNameOverride)
-                {
-                    return option.StringValue;
-                }
-            }
-            return originalTarget;
-        }
     }
 }
diff --git a/src/csharp/Grpc.Core/ChannelOptions.cs b/src/csharp/Grpc.Core/ChannelOptions.cs
index 9fe03d2805..1e0f90287a 100644
--- a/src/csharp/Grpc.Core/ChannelOptions.cs
+++ b/src/csharp/Grpc.Core/ChannelOptions.cs
@@ -30,7 +30,6 @@
 #endregion
 using System;
 using System.Collections.Generic;
-using System.Collections.Immutable;
 using System.Runtime.InteropServices;
 using System.Threading;
 using System.Threading.Tasks;
@@ -135,6 +134,9 @@ namespace Grpc.Core
         /// <summary>Initial sequence number for http2 transports</summary>
         public const string Http2InitialSequenceNumber = "grpc.http2.initial_sequence_number";
 
+        /// <summary>Default authority for calls.</summary>
+        public const string DefaultAuthority = "grpc.default_authority";
+
         /// <summary>Primary user agent: goes at the start of the user-agent metadata</summary>
         public const string PrimaryUserAgentString = "grpc.primary_user_agent";
 
diff --git a/src/csharp/Grpc.Core/ChannelState.cs b/src/csharp/Grpc.Core/ChannelState.cs
new file mode 100644
index 0000000000..d293b98f75
--- /dev/null
+++ b/src/csharp/Grpc.Core/ChannelState.cs
@@ -0,0 +1,69 @@
+#region Copyright notice and license
+
+// Copyright 2015, Google Inc.
+// All rights reserved.
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+#endregion
+
+using System;
+
+namespace Grpc.Core
+{
+    /// <summary>
+    /// Connectivity state of a channel.
+    /// Based on grpc_connectivity_state from grpc/grpc.h
+    /// </summary>
+    public enum ChannelState
+    {
+        /// <summary>
+        /// Channel is idle
+        /// </summary>
+        Idle,
+
+        /// <summary>
+        /// Channel is connecting
+        /// </summary>
+        Connecting,
+
+        /// <summary>
+        /// Channel is ready for work
+        /// </summary>
+        Ready,
+
+        /// <summary>
+        /// Channel has seen a failure but expects to recover
+        /// </summary>
+        TransientFailure,
+
+        /// <summary>
+        /// Channel has seen a failure that it cannot recover from
+        /// </summary>
+        FatalFailure
+    }
+}
diff --git a/src/csharp/Grpc.Core/ClientBase.cs b/src/csharp/Grpc.Core/ClientBase.cs
index a099f96aea..88494bb4ac 100644
--- a/src/csharp/Grpc.Core/ClientBase.cs
+++ b/src/csharp/Grpc.Core/ClientBase.cs
@@ -76,19 +76,17 @@ namespace Grpc.Core
         /// <summary>
         /// Creates a new call to given method.
         /// </summary>
-        protected Call<TRequest, TResponse> CreateCall<TRequest, TResponse>(string serviceName, Method<TRequest, TResponse> method, Metadata metadata)
+        protected CallInvocationDetails<TRequest, TResponse> CreateCall<TRequest, TResponse>(Method<TRequest, TResponse> method, CallOptions options)
             where TRequest : class
             where TResponse : class
         {
             var interceptor = HeaderInterceptor;
             if (interceptor != null)
             {
-                metadata = metadata ?? new Metadata();
-                interceptor(metadata);
-                metadata.Freeze();
+                interceptor(options.Headers);
+                options.Headers.Freeze();
             }
-            metadata = metadata ?? Metadata.Empty;
-            return new Call<TRequest, TResponse>(serviceName, method, channel, metadata);
+            return new CallInvocationDetails<TRequest, TResponse>(channel, method, options);
         }
     }
 }
diff --git a/src/csharp/Grpc.Core/Credentials.cs b/src/csharp/Grpc.Core/Credentials.cs
index e64c1e3dc1..4fcac0c4c0 100644
--- a/src/csharp/Grpc.Core/Credentials.cs
+++ b/src/csharp/Grpc.Core/Credentials.cs
@@ -41,39 +41,98 @@ namespace Grpc.Core
     /// </summary>
     public abstract class Credentials
     {
+        static readonly Credentials InsecureInstance = new InsecureCredentialsImpl();
+
+        /// <summary>
+        /// Returns instance of credential that provides no security and 
+        /// will result in creating an unsecure channel with no encryption whatsoever.
+        /// </summary>
+        public static Credentials Insecure
+        {
+            get
+            {
+                return InsecureInstance;
+            }
+        }
+
         /// <summary>
-        /// Creates native object for the credentials.
+        /// Creates native object for the credentials. May return null if insecure channel
+        /// should be created.
         /// </summary>
         /// <returns>The native credentials.</returns>
         internal abstract CredentialsSafeHandle ToNativeCredentials();
+
+        private sealed class InsecureCredentialsImpl : Credentials
+        {
+            internal override CredentialsSafeHandle ToNativeCredentials()
+            {
+                return null;
+            }
+        }
     }
 
     /// <summary>
     /// Client-side SSL credentials.
     /// </summary>
-    public class SslCredentials : Credentials
+    public sealed class SslCredentials : Credentials
     {
-        string pemRootCerts;
+        readonly string rootCertificates;
+        readonly KeyCertificatePair keyCertificatePair;
 
-        public SslCredentials(string pemRootCerts)
+        /// <summary>
+        /// Creates client-side SSL credentials loaded from
+        /// disk file pointed to by the GRPC_DEFAULT_SSL_ROOTS_FILE_PATH environment variable.
+        /// If that fails, gets the roots certificates from a well known place on disk.
+        /// </summary>
+        public SslCredentials() : this(null, null)
         {
-            this.pemRootCerts = pemRootCerts;
+        }
+
+        /// <summary>
+        /// Creates client-side SSL credentials from
+        /// a string containing PEM encoded root certificates.
+        /// </summary>
+        public SslCredentials(string rootCertificates) : this(rootCertificates, null)
+        {
+        }
+            
+        /// <summary>
+        /// Creates client-side SSL credentials.
+        /// </summary>
+        /// <param name="rootCertificates">string containing PEM encoded server root certificates.</param>
+        /// <param name="keyCertificatePair">a key certificate pair.</param>
+        public SslCredentials(string rootCertificates, KeyCertificatePair keyCertificatePair)
+        {
+            this.rootCertificates = rootCertificates;
+            this.keyCertificatePair = keyCertificatePair;
         }
 
         /// <summary>
         /// PEM encoding of the server root certificates.
         /// </summary>
-        public string RootCerts
+        public string RootCertificates
+        {
+            get
+            {
+                return this.rootCertificates;
+            }
+        }
+
+        /// <summary>
+        /// Client side key and certificate pair.
+        /// If null, client will not use key and certificate pair.
+        /// </summary>
+        public KeyCertificatePair KeyCertificatePair
         {
             get
             {
-                return this.pemRootCerts;
+                return this.keyCertificatePair;
             }
         }
 
         internal override CredentialsSafeHandle ToNativeCredentials()
         {
-            return CredentialsSafeHandle.CreateSslCredentials(pemRootCerts);
+            return CredentialsSafeHandle.CreateSslCredentials(rootCertificates, keyCertificatePair);
         }
     }
 }
diff --git a/src/csharp/Grpc.Core/Grpc.Core.csproj b/src/csharp/Grpc.Core/Grpc.Core.csproj
index fd68b91851..52defd1965 100644
--- a/src/csharp/Grpc.Core/Grpc.Core.csproj
+++ b/src/csharp/Grpc.Core/Grpc.Core.csproj
@@ -21,24 +21,29 @@
     <DefineConstants>DEBUG;</DefineConstants>
     <ErrorReport>prompt</ErrorReport>
     <WarningLevel>4</WarningLevel>
-    <ConsolePause>false</ConsolePause>
   </PropertyGroup>
   <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Release|AnyCPU' ">
-    <DebugType>full</DebugType>
+    <DebugType>pdbonly</DebugType>
     <Optimize>true</Optimize>
     <OutputPath>bin\Release</OutputPath>
     <ErrorReport>prompt</ErrorReport>
     <WarningLevel>4</WarningLevel>
-    <ConsolePause>false</ConsolePause>
+  </PropertyGroup>
+  <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'ReleaseSigned|AnyCPU' ">
+    <DebugType>pdbonly</DebugType>
+    <Optimize>true</Optimize>
+    <OutputPath>bin\ReleaseSigned</OutputPath>
+    <DefineConstants>SIGNED</DefineConstants>
+    <ErrorReport>prompt</ErrorReport>
+    <WarningLevel>4</WarningLevel>
+    <SignAssembly>True</SignAssembly>
+    <AssemblyOriginatorKeyFile>C:\keys\Grpc.snk</AssemblyOriginatorKeyFile>
   </PropertyGroup>
   <ItemGroup>
     <Reference Include="System" />
     <Reference Include="System.Interactive.Async">
       <HintPath>..\packages\Ix-Async.1.2.3\lib\net45\System.Interactive.Async.dll</HintPath>
     </Reference>
-    <Reference Include="System.Collections.Immutable">
-      <HintPath>..\packages\System.Collections.Immutable.1.1.36\lib\portable-net45+win8+wp8+wpa81\System.Collections.Immutable.dll</HintPath>
-    </Reference>
   </ItemGroup>
   <ItemGroup>
     <Compile Include="AsyncDuplexStreamingCall.cs" />
@@ -47,12 +52,11 @@
     <Compile Include="IServerStreamWriter.cs" />
     <Compile Include="IAsyncStreamWriter.cs" />
     <Compile Include="IAsyncStreamReader.cs" />
-    <Compile Include="Internal\GrpcLog.cs" />
+    <Compile Include="ServerPort.cs" />
     <Compile Include="Version.cs" />
     <Compile Include="Properties\AssemblyInfo.cs" />
     <Compile Include="RpcException.cs" />
     <Compile Include="Calls.cs" />
-    <Compile Include="Call.cs" />
     <Compile Include="AsyncClientStreamingCall.cs" />
     <Compile Include="GrpcEnvironment.cs" />
     <Compile Include="Status.cs" />
@@ -103,6 +107,14 @@
     <Compile Include="ChannelOptions.cs" />
     <Compile Include="AsyncUnaryCall.cs" />
     <Compile Include="VersionInfo.cs" />
+    <Compile Include="Internal\CStringSafeHandle.cs" />
+    <Compile Include="KeyCertificatePair.cs" />
+    <Compile Include="Logging\ILogger.cs" />
+    <Compile Include="Logging\ConsoleLogger.cs" />
+    <Compile Include="Internal\NativeLogRedirector.cs" />
+    <Compile Include="ChannelState.cs" />
+    <Compile Include="CallInvocationDetails.cs" />
+    <Compile Include="CallOptions.cs" />
   </ItemGroup>
   <ItemGroup>
     <None Include="Grpc.Core.nuspec" />
@@ -133,4 +145,5 @@
   </Target>
   <Import Project="..\packages\grpc.dependencies.openssl.redist.1.0.2.2\build\portable-net45\grpc.dependencies.openssl.redist.targets" Condition="Exists('..\packages\grpc.dependencies.openssl.redist.1.0.2.2\build\portable-net45\grpc.dependencies.openssl.redist.targets')" />
   <Import Project="..\packages\grpc.dependencies.zlib.redist.1.2.8.9\build\portable-net45\grpc.dependencies.zlib.redist.targets" Condition="Exists('..\packages\grpc.dependencies.zlib.redist.1.2.8.9\build\portable-net45\grpc.dependencies.zlib.redist.targets')" />
+  <ItemGroup />
 </Project>
\ No newline at end of file
diff --git a/src/csharp/Grpc.Core/Grpc.Core.nuspec b/src/csharp/Grpc.Core/Grpc.Core.nuspec
index 5ace6dcf89..fe49efc7ec 100644
--- a/src/csharp/Grpc.Core/Grpc.Core.nuspec
+++ b/src/csharp/Grpc.Core/Grpc.Core.nuspec
@@ -15,15 +15,14 @@
     <copyright>Copyright 2015, Google Inc.</copyright>
     <tags>gRPC RPC Protocol HTTP/2</tags>
 	<dependencies>
-	  <dependency id="System.Collections.Immutable" version="1.1.36" />
 	  <dependency id="Ix-Async" version="1.2.3" />
 	  <dependency id="grpc.native.csharp_ext" version="$GrpcNativeCsharpExtVersion$" />
     </dependencies>
   </metadata>
   <files>
-    <file src="bin/Release/Grpc.Core.dll" target="lib/net45" />
-	<file src="bin/Release/Grpc.Core.pdb" target="lib/net45" />
-	<file src="bin/Release/Grpc.Core.xml" target="lib/net45" />
+    <file src="bin/ReleaseSigned/Grpc.Core.dll" target="lib/net45" />
+	<file src="bin/ReleaseSigned/Grpc.Core.pdb" target="lib/net45" />
+	<file src="bin/ReleaseSigned/Grpc.Core.xml" target="lib/net45" />
 	<file src="**\*.cs" target="src" />
   </files>
 </package>
diff --git a/src/csharp/Grpc.Core/GrpcEnvironment.cs b/src/csharp/Grpc.Core/GrpcEnvironment.cs
index 47d1651aab..034a66be3c 100644
--- a/src/csharp/Grpc.Core/GrpcEnvironment.cs
+++ b/src/csharp/Grpc.Core/GrpcEnvironment.cs
@@ -35,6 +35,7 @@ using System;
 using System.Runtime.InteropServices;
 using System.Threading.Tasks;
 using Grpc.Core.Internal;
+using Grpc.Core.Logging;
 using Grpc.Core.Utils;
 
 namespace Grpc.Core
@@ -55,6 +56,8 @@ namespace Grpc.Core
         static object staticLock = new object();
         static GrpcEnvironment instance;
 
+        static ILogger logger = new ConsoleLogger();
+
         readonly GrpcThreadPool threadPool;
         readonly CompletionRegistry completionRegistry;
         readonly DebugStats debugStats = new DebugStats();
@@ -93,17 +96,38 @@ namespace Grpc.Core
         }
 
         /// <summary>
+        /// Gets application-wide logger used by gRPC.
+        /// </summary>
+        /// <value>The logger.</value>
+        public static ILogger Logger
+        {
+            get
+            {
+                return logger;
+            }
+        }
+
+        /// <summary>
+        /// Sets the application-wide logger that should be used by gRPC.
+        /// </summary>
+        public static void SetLogger(ILogger customLogger)
+        {
+            Preconditions.CheckNotNull(customLogger);
+            logger = customLogger;
+        }
+
+        /// <summary>
         /// Creates gRPC environment.
         /// </summary>
         private GrpcEnvironment()
         {
-            GrpcLog.RedirectNativeLogs(Console.Error);
+            NativeLogRedirector.Redirect();
             grpcsharp_init();
             completionRegistry = new CompletionRegistry(this);
             threadPool = new GrpcThreadPool(this, THREAD_POOL_SIZE);
             threadPool.Start();
             // TODO: use proper logging here
-            Console.WriteLine("GRPC initialized.");
+            Logger.Info("gRPC initialized.");
         }
 
         /// <summary>
@@ -154,8 +178,7 @@ namespace Grpc.Core
 
             debugStats.CheckOK();
 
-            // TODO: use proper logging here
-            Console.WriteLine("GRPC shutdown.");
+            Logger.Info("gRPC shutdown.");
         }
 
         /// <summary>
@@ -171,7 +194,7 @@ namespace Grpc.Core
                 }
                 catch (Exception e)
                 {
-                    Console.WriteLine("Error occured while shutting down GrpcEnvironment: " + e);
+                    Logger.Error(e, "Error occured while shutting down GrpcEnvironment.");
                 }
             });
         }
diff --git a/src/csharp/Grpc.Core/Internal/AsyncCall.cs b/src/csharp/Grpc.Core/Internal/AsyncCall.cs
index f983dbb759..414b5c4282 100644
--- a/src/csharp/Grpc.Core/Internal/AsyncCall.cs
+++ b/src/csharp/Grpc.Core/Internal/AsyncCall.cs
@@ -38,6 +38,7 @@ using System.Runtime.InteropServices;
 using System.Threading;
 using System.Threading.Tasks;
 using Grpc.Core.Internal;
+using Grpc.Core.Logging;
 using Grpc.Core.Utils;
 
 namespace Grpc.Core.Internal
@@ -47,7 +48,9 @@ namespace Grpc.Core.Internal
     /// </summary>
     internal class AsyncCall<TRequest, TResponse> : AsyncCallBase<TRequest, TResponse>
     {
-        Channel channel;
+        static readonly ILogger Logger = GrpcEnvironment.Logger.ForType<AsyncCall<TRequest, TResponse>>();
+
+        readonly CallInvocationDetails<TRequest, TResponse> callDetails;
 
         // Completion of a pending unary response if not null.
         TaskCompletionSource<TResponse> unaryResponseTcs;
@@ -57,26 +60,18 @@ namespace Grpc.Core.Internal
 
         bool readObserverCompleted;  // True if readObserver has already been completed.
 
-        public AsyncCall(Func<TRequest, byte[]> serializer, Func<byte[], TResponse> deserializer) : base(serializer, deserializer)
+        public AsyncCall(CallInvocationDetails<TRequest, TResponse> callDetails)
+            : base(callDetails.RequestMarshaller.Serializer, callDetails.ResponseMarshaller.Deserializer)
         {
-        }
-
-        public void Initialize(Channel channel, CompletionQueueSafeHandle cq, string methodName)
-        {
-            this.channel = channel;
-            var call = CallSafeHandle.Create(channel.Handle, channel.CompletionRegistry, cq, methodName, channel.Target, Timespec.InfFuture);
-            channel.Environment.DebugStats.ActiveClientCalls.Increment();
-            InitializeInternal(call);
+            this.callDetails = callDetails;
         }
 
         // TODO: this method is not Async, so it shouldn't be in AsyncCall class, but 
         // it is reusing fair amount of code in this class, so we are leaving it here.
-        // TODO: for other calls, you need to call Initialize, this methods calls initialize 
-        // on its own, so there's a usage inconsistency.
         /// <summary>
         /// Blocking unary request - unary response call.
         /// </summary>
-        public TResponse UnaryCall(Channel channel, string methodName, TRequest msg, Metadata headers)
+        public TResponse UnaryCall(TRequest msg)
         {
             using (CompletionQueueSafeHandle cq = CompletionQueueSafeHandle.Create())
             {
@@ -86,13 +81,15 @@ namespace Grpc.Core.Internal
 
                 lock (myLock)
                 {
-                    Initialize(channel, cq, methodName);
+                    Preconditions.CheckState(!started);
                     started = true;
+                    Initialize(cq);
+
                     halfcloseRequested = true;
                     readingDone = true;
                 }
 
-                using (var metadataArray = MetadataArraySafeHandle.Create(headers))
+                using (var metadataArray = MetadataArraySafeHandle.Create(callDetails.Options.Headers))
                 {
                     using (var ctx = BatchContextSafeHandle.Create())
                     {
@@ -106,7 +103,7 @@ namespace Grpc.Core.Internal
                         }
                         catch (Exception e)
                         {
-                            Console.WriteLine("Exception occured while invoking completion delegate: " + e);
+                            Logger.Error(e, "Exception occured while invoking completion delegate.");
                         }
                     }
                 }
@@ -126,20 +123,22 @@ namespace Grpc.Core.Internal
         /// <summary>
         /// Starts a unary request - unary response call.
         /// </summary>
-        public Task<TResponse> UnaryCallAsync(TRequest msg, Metadata headers)
+        public Task<TResponse> UnaryCallAsync(TRequest msg)
         {
             lock (myLock)
             {
-                Preconditions.CheckNotNull(call);
-
+                Preconditions.CheckState(!started);
                 started = true;
+
+                Initialize(callDetails.Channel.Environment.CompletionQueue);
+
                 halfcloseRequested = true;
                 readingDone = true;
 
                 byte[] payload = UnsafeSerialize(msg);
 
                 unaryResponseTcs = new TaskCompletionSource<TResponse>();
-                using (var metadataArray = MetadataArraySafeHandle.Create(headers))
+                using (var metadataArray = MetadataArraySafeHandle.Create(callDetails.Options.Headers))
                 {
                     call.StartUnary(payload, HandleUnaryResponse, metadataArray);
                 }
@@ -151,17 +150,19 @@ namespace Grpc.Core.Internal
         /// Starts a streamed request - unary response call.
         /// Use StartSendMessage and StartSendCloseFromClient to stream requests.
         /// </summary>
-        public Task<TResponse> ClientStreamingCallAsync(Metadata headers)
+        public Task<TResponse> ClientStreamingCallAsync()
         {
             lock (myLock)
             {
-                Preconditions.CheckNotNull(call);
-
+                Preconditions.CheckState(!started);
                 started = true;
+
+                Initialize(callDetails.Channel.Environment.CompletionQueue);
+
                 readingDone = true;
 
                 unaryResponseTcs = new TaskCompletionSource<TResponse>();
-                using (var metadataArray = MetadataArraySafeHandle.Create(headers))
+                using (var metadataArray = MetadataArraySafeHandle.Create(callDetails.Options.Headers))
                 {
                     call.StartClientStreaming(HandleUnaryResponse, metadataArray);
                 }
@@ -173,19 +174,21 @@ namespace Grpc.Core.Internal
         /// <summary>
         /// Starts a unary request - streamed response call.
         /// </summary>
-        public void StartServerStreamingCall(TRequest msg, Metadata headers)
+        public void StartServerStreamingCall(TRequest msg)
         {
             lock (myLock)
             {
-                Preconditions.CheckNotNull(call);
-
+                Preconditions.CheckState(!started);
                 started = true;
+
+                Initialize(callDetails.Channel.Environment.CompletionQueue);
+
                 halfcloseRequested = true;
                 halfclosed = true;  // halfclose not confirmed yet, but it will be once finishedHandler is called.
 
                 byte[] payload = UnsafeSerialize(msg);
 
-                using (var metadataArray = MetadataArraySafeHandle.Create(headers))
+                using (var metadataArray = MetadataArraySafeHandle.Create(callDetails.Options.Headers))
                 {
                     call.StartServerStreaming(payload, HandleFinished, metadataArray);
                 }
@@ -196,15 +199,16 @@ namespace Grpc.Core.Internal
         /// Starts a streaming request - streaming response call.
         /// Use StartSendMessage and StartSendCloseFromClient to stream requests.
         /// </summary>
-        public void StartDuplexStreamingCall(Metadata headers)
+        public void StartDuplexStreamingCall()
         {
             lock (myLock)
             {
-                Preconditions.CheckNotNull(call);
-
+                Preconditions.CheckState(!started);
                 started = true;
 
-                using (var metadataArray = MetadataArraySafeHandle.Create(headers))
+                Initialize(callDetails.Channel.Environment.CompletionQueue);
+
+                using (var metadataArray = MetadataArraySafeHandle.Create(callDetails.Options.Headers))
                 {
                     call.StartDuplexStreaming(HandleFinished, metadataArray);
                 }
@@ -306,7 +310,26 @@ namespace Grpc.Core.Internal
 
         protected override void OnReleaseResources()
         {
-            channel.Environment.DebugStats.ActiveClientCalls.Decrement();
+            callDetails.Channel.Environment.DebugStats.ActiveClientCalls.Decrement();
+        }
+
+        private void Initialize(CompletionQueueSafeHandle cq)
+        {
+            var call = callDetails.Channel.Handle.CreateCall(callDetails.Channel.Environment.CompletionRegistry, cq,
+                callDetails.Method, callDetails.Host, Timespec.FromDateTime(callDetails.Options.Deadline));
+            callDetails.Channel.Environment.DebugStats.ActiveClientCalls.Increment();
+            InitializeInternal(call);
+            RegisterCancellationCallback();
+        }
+
+        // Make sure that once cancellationToken for this call is cancelled, Cancel() will be called.
+        private void RegisterCancellationCallback()
+        {
+            var token = callDetails.Options.CancellationToken;
+            if (token.CanBeCanceled)
+            {
+                token.Register(() => this.Cancel());
+            }
         }
 
         /// <summary>
diff --git a/src/csharp/Grpc.Core/Internal/AsyncCallBase.cs b/src/csharp/Grpc.Core/Internal/AsyncCallBase.cs
index 64713c8c52..38f2a5baeb 100644
--- a/src/csharp/Grpc.Core/Internal/AsyncCallBase.cs
+++ b/src/csharp/Grpc.Core/Internal/AsyncCallBase.cs
@@ -38,6 +38,7 @@ using System.Runtime.InteropServices;
 using System.Threading;
 using System.Threading.Tasks;
 using Grpc.Core.Internal;
+using Grpc.Core.Logging;
 using Grpc.Core.Utils;
 
 namespace Grpc.Core.Internal
@@ -48,6 +49,8 @@ namespace Grpc.Core.Internal
     /// </summary>
     internal abstract class AsyncCallBase<TWrite, TRead>
     {
+        static readonly ILogger Logger = GrpcEnvironment.Logger.ForType<AsyncCallBase<TWrite, TRead>>();
+
         readonly Func<TWrite, byte[]> serializer;
         readonly Func<byte[], TRead> deserializer;
 
@@ -233,9 +236,9 @@ namespace Grpc.Core.Internal
                 payload = serializer(msg);
                 return true;
             }
-            catch (Exception)
+            catch (Exception e)
             {
-                Console.WriteLine("Exception occured while trying to serialize message");
+                Logger.Error(e, "Exception occured while trying to serialize message");
                 payload = null;
                 return false;
             }
@@ -248,9 +251,9 @@ namespace Grpc.Core.Internal
                 msg = deserializer(payload);
                 return true;
             } 
-            catch (Exception)
+            catch (Exception e)
             {
-                Console.WriteLine("Exception occured while trying to deserialize message");
+                Logger.Error(e, "Exception occured while trying to deserialize message.");
                 msg = default(TRead);
                 return false;
             }
@@ -264,7 +267,7 @@ namespace Grpc.Core.Internal
             }
             catch (Exception e)
             {
-                Console.WriteLine("Exception occured while invoking completion delegate: " + e);
+                Logger.Error(e, "Exception occured while invoking completion delegate.");
             }
         }
 
diff --git a/src/csharp/Grpc.Core/Internal/AsyncCallServer.cs b/src/csharp/Grpc.Core/Internal/AsyncCallServer.cs
index f809f4a84c..513902ee36 100644
--- a/src/csharp/Grpc.Core/Internal/AsyncCallServer.cs
+++ b/src/csharp/Grpc.Core/Internal/AsyncCallServer.cs
@@ -48,6 +48,7 @@ namespace Grpc.Core.Internal
     internal class AsyncCallServer<TRequest, TResponse> : AsyncCallBase<TResponse, TRequest>
     {
         readonly TaskCompletionSource<object> finishedServersideTcs = new TaskCompletionSource<object>();
+        readonly CancellationTokenSource cancellationTokenSource = new CancellationTokenSource();
         readonly GrpcEnvironment environment;
 
         public AsyncCallServer(Func<TResponse, byte[]> serializer, Func<byte[], TRequest> deserializer, GrpcEnvironment environment) : base(serializer, deserializer)
@@ -118,6 +119,26 @@ namespace Grpc.Core.Internal
             }
         }
 
+        /// <summary>
+        /// Gets cancellation token that gets cancelled once close completion
+        /// is received and the cancelled flag is set.
+        /// </summary>
+        public CancellationToken CancellationToken
+        {
+            get
+            {
+                return cancellationTokenSource.Token;
+            }
+        }
+
+        public string Peer
+        {
+            get
+            {
+                return call.GetPeer();
+            }
+        }
+
         protected override void OnReleaseResources()
         {
             environment.DebugStats.ActiveServerCalls.Decrement();
@@ -138,6 +159,8 @@ namespace Grpc.Core.Internal
                 {
                     // Once we cancel, we don't have to care that much 
                     // about reads and writes.
+
+                    // TODO(jtattermusch): is this still necessary?
                     Cancel();
                 }
 
@@ -145,6 +168,11 @@ namespace Grpc.Core.Internal
             }
             // TODO(jtattermusch): handle error
 
+            if (cancelled)
+            {
+                cancellationTokenSource.Cancel();
+            }
+
             finishedServersideTcs.SetResult(null);
         }
     }
diff --git a/src/csharp/Grpc.Core/Internal/CStringSafeHandle.cs b/src/csharp/Grpc.Core/Internal/CStringSafeHandle.cs
new file mode 100644
index 0000000000..92fbe8cf0f
--- /dev/null
+++ b/src/csharp/Grpc.Core/Internal/CStringSafeHandle.cs
@@ -0,0 +1,60 @@
+#region Copyright notice and license
+// Copyright 2015, Google Inc.
+// All rights reserved.
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+#endregion
+using System;
+using System.Runtime.InteropServices;
+using System.Threading.Tasks;
+
+namespace Grpc.Core.Internal
+{
+    /// <summary>
+    /// Owned char* object.
+    /// </summary>
+    internal class CStringSafeHandle : SafeHandleZeroIsInvalid
+    {
+        [DllImport("grpc_csharp_ext.dll")]
+        static extern void gprsharp_free(IntPtr ptr);
+
+        private CStringSafeHandle()
+        {
+        }
+
+        public string GetValue()
+        {
+            return Marshal.PtrToStringAnsi(handle);
+        }
+
+        protected override bool ReleaseHandle()
+        {
+            gprsharp_free(handle);
+            return true;
+        }
+    }
+}
diff --git a/src/csharp/Grpc.Core/Internal/CallSafeHandle.cs b/src/csharp/Grpc.Core/Internal/CallSafeHandle.cs
index 19dbb83f24..714749b171 100644
--- a/src/csharp/Grpc.Core/Internal/CallSafeHandle.cs
+++ b/src/csharp/Grpc.Core/Internal/CallSafeHandle.cs
@@ -46,9 +46,6 @@ namespace Grpc.Core.Internal
         CompletionRegistry completionRegistry;
 
         [DllImport("grpc_csharp_ext.dll")]
-        static extern CallSafeHandle grpcsharp_channel_create_call(ChannelSafeHandle channel, CompletionQueueSafeHandle cq, string method, string host, Timespec deadline);
-
-        [DllImport("grpc_csharp_ext.dll")]
         static extern GRPCCallError grpcsharp_call_cancel(CallSafeHandle call);
 
         [DllImport("grpc_csharp_ext.dll")]
@@ -92,19 +89,15 @@ namespace Grpc.Core.Internal
             BatchContextSafeHandle ctx);
 
         [DllImport("grpc_csharp_ext.dll")]
+        static extern CStringSafeHandle grpcsharp_call_get_peer(CallSafeHandle call);
+
+        [DllImport("grpc_csharp_ext.dll")]
         static extern void grpcsharp_call_destroy(IntPtr call);
 
         private CallSafeHandle()
         {
         }
 
-        public static CallSafeHandle Create(ChannelSafeHandle channel, CompletionRegistry registry, CompletionQueueSafeHandle cq, string method, string host, Timespec deadline)
-        {
-            var result = grpcsharp_channel_create_call(channel, cq, method, host, deadline);
-            result.SetCompletionRegistry(registry);
-            return result;
-        }
-
         public void SetCompletionRegistry(CompletionRegistry completionRegistry)
         {
             this.completionRegistry = completionRegistry;
@@ -190,6 +183,14 @@ namespace Grpc.Core.Internal
             grpcsharp_call_cancel_with_status(this, status.StatusCode, status.Detail).CheckOk();
         }
 
+        public string GetPeer()
+        {
+            using (var cstring = grpcsharp_call_get_peer(this))
+            {
+                return cstring.GetValue();
+            }
+        }
+
         protected override bool ReleaseHandle()
         {
             grpcsharp_call_destroy(handle);
diff --git a/src/csharp/Grpc.Core/Internal/ChannelSafeHandle.cs b/src/csharp/Grpc.Core/Internal/ChannelSafeHandle.cs
index f046f4c6d0..7324ebdf57 100644
--- a/src/csharp/Grpc.Core/Internal/ChannelSafeHandle.cs
+++ b/src/csharp/Grpc.Core/Internal/ChannelSafeHandle.cs
@@ -41,21 +41,34 @@ namespace Grpc.Core.Internal
     internal class ChannelSafeHandle : SafeHandleZeroIsInvalid
     {
         [DllImport("grpc_csharp_ext.dll")]
-        static extern ChannelSafeHandle grpcsharp_channel_create(string target, ChannelArgsSafeHandle channelArgs);
+        static extern ChannelSafeHandle grpcsharp_insecure_channel_create(string target, ChannelArgsSafeHandle channelArgs);
 
         [DllImport("grpc_csharp_ext.dll")]
         static extern ChannelSafeHandle grpcsharp_secure_channel_create(CredentialsSafeHandle credentials, string target, ChannelArgsSafeHandle channelArgs);
 
         [DllImport("grpc_csharp_ext.dll")]
+        static extern CallSafeHandle grpcsharp_channel_create_call(ChannelSafeHandle channel, CompletionQueueSafeHandle cq, string method, string host, Timespec deadline);
+
+        [DllImport("grpc_csharp_ext.dll")]
+        static extern ChannelState grpcsharp_channel_check_connectivity_state(ChannelSafeHandle channel, int tryToConnect);
+
+        [DllImport("grpc_csharp_ext.dll")]
+        static extern void grpcsharp_channel_watch_connectivity_state(ChannelSafeHandle channel, ChannelState lastObservedState,
+            Timespec deadline, CompletionQueueSafeHandle cq, BatchContextSafeHandle ctx);
+
+        [DllImport("grpc_csharp_ext.dll")]
+        static extern CStringSafeHandle grpcsharp_channel_get_target(ChannelSafeHandle call);
+
+        [DllImport("grpc_csharp_ext.dll")]
         static extern void grpcsharp_channel_destroy(IntPtr channel);
 
         private ChannelSafeHandle()
         {
         }
 
-        public static ChannelSafeHandle Create(string target, ChannelArgsSafeHandle channelArgs)
+        public static ChannelSafeHandle CreateInsecure(string target, ChannelArgsSafeHandle channelArgs)
         {
-            return grpcsharp_channel_create(target, channelArgs);
+            return grpcsharp_insecure_channel_create(target, channelArgs);
         }
 
         public static ChannelSafeHandle CreateSecure(CredentialsSafeHandle credentials, string target, ChannelArgsSafeHandle channelArgs)
@@ -63,6 +76,34 @@ namespace Grpc.Core.Internal
             return grpcsharp_secure_channel_create(credentials, target, channelArgs);
         }
 
+        public CallSafeHandle CreateCall(CompletionRegistry registry, CompletionQueueSafeHandle cq, string method, string host, Timespec deadline)
+        {
+            var result = grpcsharp_channel_create_call(this, cq, method, host, deadline);
+            result.SetCompletionRegistry(registry);
+            return result;
+        }
+
+        public ChannelState CheckConnectivityState(bool tryToConnect)
+        {
+            return grpcsharp_channel_check_connectivity_state(this, tryToConnect ? 1 : 0);
+        }
+
+        public void WatchConnectivityState(ChannelState lastObservedState, Timespec deadline, CompletionQueueSafeHandle cq,
+            CompletionRegistry completionRegistry, BatchCompletionDelegate callback)
+        {
+            var ctx = BatchContextSafeHandle.Create();
+            completionRegistry.RegisterBatchCompletion(ctx, callback);
+            grpcsharp_channel_watch_connectivity_state(this, lastObservedState, deadline, cq, ctx);
+        }
+
+        public string GetTarget()
+        {
+            using (var cstring = grpcsharp_channel_get_target(this))
+            {
+                return cstring.GetValue();
+            }
+        }
+
         protected override bool ReleaseHandle()
         {
             grpcsharp_channel_destroy(handle);
diff --git a/src/csharp/Grpc.Core/Internal/CompletionRegistry.cs b/src/csharp/Grpc.Core/Internal/CompletionRegistry.cs
index f6d8aa0600..2796c959a3 100644
--- a/src/csharp/Grpc.Core/Internal/CompletionRegistry.cs
+++ b/src/csharp/Grpc.Core/Internal/CompletionRegistry.cs
@@ -35,6 +35,7 @@ using System;
 using System.Collections.Concurrent;
 using System.Collections.Generic;
 using System.Runtime.InteropServices;
+using Grpc.Core.Logging;
 using Grpc.Core.Utils;
 
 namespace Grpc.Core.Internal
@@ -45,6 +46,8 @@ namespace Grpc.Core.Internal
 
     internal class CompletionRegistry
     {
+        static readonly ILogger Logger = GrpcEnvironment.Logger.ForType<CompletionRegistry>();
+
         readonly GrpcEnvironment environment;
         readonly ConcurrentDictionary<IntPtr, OpCompletionDelegate> dict = new ConcurrentDictionary<IntPtr, OpCompletionDelegate>();
 
@@ -81,7 +84,7 @@ namespace Grpc.Core.Internal
             }
             catch (Exception e)
             {
-                Console.WriteLine("Exception occured while invoking completion delegate: " + e);
+                Logger.Error(e, "Exception occured while invoking completion delegate.");
             }
             finally
             {
diff --git a/src/csharp/Grpc.Core/Internal/CredentialsSafeHandle.cs b/src/csharp/Grpc.Core/Internal/CredentialsSafeHandle.cs
index f361199068..8b4fa85e5d 100644
--- a/src/csharp/Grpc.Core/Internal/CredentialsSafeHandle.cs
+++ b/src/csharp/Grpc.Core/Internal/CredentialsSafeHandle.cs
@@ -50,9 +50,23 @@ namespace Grpc.Core.Internal
         {
         }
 
-        public static CredentialsSafeHandle CreateSslCredentials(string pemRootCerts)
+        public static CredentialsSafeHandle CreateNullCredentials()
         {
-            return grpcsharp_ssl_credentials_create(pemRootCerts, null, null);
+            var creds = new CredentialsSafeHandle();
+            creds.SetHandle(IntPtr.Zero);
+            return creds;
+        }
+
+        public static CredentialsSafeHandle CreateSslCredentials(string pemRootCerts, KeyCertificatePair keyCertPair)
+        {
+            if (keyCertPair != null)
+            {
+                return grpcsharp_ssl_credentials_create(pemRootCerts, keyCertPair.CertificateChain, keyCertPair.PrivateKey);
+            }
+            else
+            {
+                return grpcsharp_ssl_credentials_create(pemRootCerts, null, null);
+            }
         }
 
         protected override bool ReleaseHandle()
diff --git a/src/csharp/Grpc.Core/Internal/GrpcThreadPool.cs b/src/csharp/Grpc.Core/Internal/GrpcThreadPool.cs
index b77e893044..cb4c7c821e 100644
--- a/src/csharp/Grpc.Core/Internal/GrpcThreadPool.cs
+++ b/src/csharp/Grpc.Core/Internal/GrpcThreadPool.cs
@@ -36,7 +36,7 @@ using System.Collections.Generic;
 using System.Runtime.InteropServices;
 using System.Threading;
 using System.Threading.Tasks;
-using Grpc.Core.Internal;
+using Grpc.Core.Logging;
 
 namespace Grpc.Core.Internal
 {
@@ -45,6 +45,8 @@ namespace Grpc.Core.Internal
     /// </summary>
     internal class GrpcThreadPool
     {
+        static readonly ILogger Logger = GrpcEnvironment.Logger.ForType<GrpcThreadPool>();
+
         readonly GrpcEnvironment environment;
         readonly object myLock = new object();
         readonly List<Thread> threads = new List<Thread>();
@@ -82,7 +84,7 @@ namespace Grpc.Core.Internal
             {
                 cq.Shutdown();
 
-                Console.WriteLine("Waiting for GRPC threads to finish.");
+                Logger.Info("Waiting for GRPC threads to finish.");
                 foreach (var thread in threads)
                 {
                     thread.Join();
@@ -129,12 +131,12 @@ namespace Grpc.Core.Internal
                     }
                     catch (Exception e)
                     {
-                        Console.WriteLine("Exception occured while invoking completion delegate: " + e);
+                        Logger.Error(e, "Exception occured while invoking completion delegate");
                     }
                 }
             }
             while (ev.type != GRPCCompletionType.Shutdown);
-            Console.WriteLine("Completion queue has shutdown successfully, thread " + Thread.CurrentThread.Name + " exiting.");
+            Logger.Info("Completion queue has shutdown successfully, thread {0} exiting.", Thread.CurrentThread.Name);
         }
     }
 }
diff --git a/src/csharp/Grpc.Core/Internal/GrpcLog.cs b/src/csharp/Grpc.Core/Internal/NativeLogRedirector.cs
index 2f3c8ad71c..b8a55c5fe8 100644
--- a/src/csharp/Grpc.Core/Internal/GrpcLog.cs
+++ b/src/csharp/Grpc.Core/Internal/NativeLogRedirector.cs
@@ -44,30 +44,26 @@ namespace Grpc.Core.Internal
 
     /// <summary>
     /// Logs from gRPC C core library can get lost if your application is not a console app.
-    /// This class allows redirection of logs to arbitrary destination.
+    /// This class allows redirection of logs to gRPC logger.
     /// </summary>
-    internal static class GrpcLog
+    internal static class NativeLogRedirector
     {
         static object staticLock = new object();
         static GprLogDelegate writeCallback;
-        static TextWriter dest;
 
         [DllImport("grpc_csharp_ext.dll")]
         static extern void grpcsharp_redirect_log(GprLogDelegate callback);
 
         /// <summary>
-        /// Sets text writer as destination for logs from native gRPC C core library.
-        /// Only first invocation has effect.
+        /// Redirects logs from native gRPC C core library to a general logger.
         /// </summary>
-        /// <param name="textWriter"></param>
-        public static void RedirectNativeLogs(TextWriter textWriter)
+        public static void Redirect()
         {
             lock (staticLock)
             {
                 if (writeCallback == null)
                 {
                     writeCallback = new GprLogDelegate(HandleWrite);
-                    dest = textWriter;
                     grpcsharp_redirect_log(writeCallback);    
                 }
             }
@@ -77,13 +73,30 @@ namespace Grpc.Core.Internal
         {
             try
             {
-                // TODO: DateTime format used here is different than in C core.
-                dest.WriteLine(string.Format("{0}{1} {2} {3}:{4}: {5}", 
-                    Marshal.PtrToStringAnsi(severityStringPtr), DateTime.Now,  
+                var logger = GrpcEnvironment.Logger;
+                string severityString = Marshal.PtrToStringAnsi(severityStringPtr);
+                string message = string.Format("{0} {1}:{2}: {3}",
                     threadId,
                     Marshal.PtrToStringAnsi(fileStringPtr), 
                     line, 
-                    Marshal.PtrToStringAnsi(msgPtr)));
+                    Marshal.PtrToStringAnsi(msgPtr));
+                
+                switch (severityString)
+                {
+                    case "D":
+                        logger.Debug(message);
+                        break;
+                    case "I":
+                        logger.Info(message);
+                        break;
+                    case "E":
+                        logger.Error(message);
+                        break;
+                    default:
+                        // severity not recognized, default to error.
+                        logger.Error(message);
+                        break;
+                }
             }
             catch (Exception e)
             {
diff --git a/src/csharp/Grpc.Core/Internal/ServerCallHandler.cs b/src/csharp/Grpc.Core/Internal/ServerCallHandler.cs
index 3680b1e791..19f0e3c57f 100644
--- a/src/csharp/Grpc.Core/Internal/ServerCallHandler.cs
+++ b/src/csharp/Grpc.Core/Internal/ServerCallHandler.cs
@@ -37,6 +37,7 @@ using System.Linq;
 using System.Threading;
 using System.Threading.Tasks;
 using Grpc.Core.Internal;
+using Grpc.Core.Logging;
 using Grpc.Core.Utils;
 
 namespace Grpc.Core.Internal
@@ -50,6 +51,8 @@ namespace Grpc.Core.Internal
         where TRequest : class
         where TResponse : class
     {
+        static readonly ILogger Logger = GrpcEnvironment.Logger.ForType<UnaryServerCallHandler<TRequest, TResponse>>();
+
         readonly Method<TRequest, TResponse> method;
         readonly UnaryServerMethod<TRequest, TResponse> handler;
 
@@ -72,7 +75,7 @@ namespace Grpc.Core.Internal
             var responseStream = new ServerResponseStream<TRequest, TResponse>(asyncCall);
 
             Status status;
-            var context = HandlerUtils.NewContext(newRpc);
+            var context = HandlerUtils.NewContext(newRpc, asyncCall.Peer, asyncCall.CancellationToken);
             try
             {
                 Preconditions.CheckArgument(await requestStream.MoveNext());
@@ -85,7 +88,7 @@ namespace Grpc.Core.Internal
             } 
             catch (Exception e)
             {
-                Console.WriteLine("Exception occured in handler: " + e);
+                Logger.Error(e, "Exception occured in handler.");
                 status = HandlerUtils.StatusFromException(e);
             }
             try
@@ -104,6 +107,8 @@ namespace Grpc.Core.Internal
         where TRequest : class
         where TResponse : class
     {
+        static readonly ILogger Logger = GrpcEnvironment.Logger.ForType<ServerStreamingServerCallHandler<TRequest, TResponse>>();
+
         readonly Method<TRequest, TResponse> method;
         readonly ServerStreamingServerMethod<TRequest, TResponse> handler;
 
@@ -126,7 +131,7 @@ namespace Grpc.Core.Internal
             var responseStream = new ServerResponseStream<TRequest, TResponse>(asyncCall);
 
             Status status;
-            var context = HandlerUtils.NewContext(newRpc);
+            var context = HandlerUtils.NewContext(newRpc, asyncCall.Peer, asyncCall.CancellationToken);
             try
             {
                 Preconditions.CheckArgument(await requestStream.MoveNext());
@@ -138,7 +143,7 @@ namespace Grpc.Core.Internal
             }
             catch (Exception e)
             {
-                Console.WriteLine("Exception occured in handler: " + e);
+                Logger.Error(e, "Exception occured in handler.");
                 status = HandlerUtils.StatusFromException(e);
             }
 
@@ -158,6 +163,8 @@ namespace Grpc.Core.Internal
         where TRequest : class
         where TResponse : class
     {
+        static readonly ILogger Logger = GrpcEnvironment.Logger.ForType<ClientStreamingServerCallHandler<TRequest, TResponse>>();
+
         readonly Method<TRequest, TResponse> method;
         readonly ClientStreamingServerMethod<TRequest, TResponse> handler;
 
@@ -180,7 +187,7 @@ namespace Grpc.Core.Internal
             var responseStream = new ServerResponseStream<TRequest, TResponse>(asyncCall);
 
             Status status;
-            var context = HandlerUtils.NewContext(newRpc);
+            var context = HandlerUtils.NewContext(newRpc, asyncCall.Peer, asyncCall.CancellationToken);
             try
             {
                 var result = await handler(requestStream, context);
@@ -196,7 +203,7 @@ namespace Grpc.Core.Internal
             }
             catch (Exception e)
             {
-                Console.WriteLine("Exception occured in handler: " + e);
+                Logger.Error(e, "Exception occured in handler.");
                 status = HandlerUtils.StatusFromException(e);
             }
 
@@ -216,6 +223,8 @@ namespace Grpc.Core.Internal
         where TRequest : class
         where TResponse : class
     {
+        static readonly ILogger Logger = GrpcEnvironment.Logger.ForType<DuplexStreamingServerCallHandler<TRequest, TResponse>>();
+
         readonly Method<TRequest, TResponse> method;
         readonly DuplexStreamingServerMethod<TRequest, TResponse> handler;
 
@@ -238,7 +247,7 @@ namespace Grpc.Core.Internal
             var responseStream = new ServerResponseStream<TRequest, TResponse>(asyncCall);
 
             Status status;
-            var context = HandlerUtils.NewContext(newRpc);
+            var context = HandlerUtils.NewContext(newRpc, asyncCall.Peer, asyncCall.CancellationToken);
             try
             {
                 await handler(requestStream, responseStream, context);
@@ -246,7 +255,7 @@ namespace Grpc.Core.Internal
             }
             catch (Exception e)
             {
-                Console.WriteLine("Exception occured in handler: " + e);
+                Logger.Error(e, "Exception occured in handler.");
                 status = HandlerUtils.StatusFromException(e);
             }
             try
@@ -295,11 +304,13 @@ namespace Grpc.Core.Internal
             return new Status(StatusCode.Unknown, "Exception was thrown by handler.");
         }
 
-        public static ServerCallContext NewContext(ServerRpcNew newRpc)
+        public static ServerCallContext NewContext(ServerRpcNew newRpc, string peer, CancellationToken cancellationToken)
         {
+            DateTime realtimeDeadline = newRpc.Deadline.ToClockType(GPRClockType.Realtime).ToDateTime();
+
             return new ServerCallContext(
-                newRpc.Method, newRpc.Host, newRpc.Deadline.ToDateTime(),
-                newRpc.RequestMetadata, CancellationToken.None);
+                newRpc.Method, newRpc.Host, peer, realtimeDeadline,
+                newRpc.RequestMetadata, cancellationToken);
         }
     }
 }
diff --git a/src/csharp/Grpc.Core/Internal/ServerCredentialsSafeHandle.cs b/src/csharp/Grpc.Core/Internal/ServerCredentialsSafeHandle.cs
index 961180741a..37a4f5256b 100644
--- a/src/csharp/Grpc.Core/Internal/ServerCredentialsSafeHandle.cs
+++ b/src/csharp/Grpc.Core/Internal/ServerCredentialsSafeHandle.cs
@@ -42,7 +42,7 @@ namespace Grpc.Core.Internal
     internal class ServerCredentialsSafeHandle : SafeHandleZeroIsInvalid
     {
         [DllImport("grpc_csharp_ext.dll", CharSet = CharSet.Ansi)]
-        static extern ServerCredentialsSafeHandle grpcsharp_ssl_server_credentials_create(string pemRootCerts, string[] keyCertPairCertChainArray, string[] keyCertPairPrivateKeyArray, UIntPtr numKeyCertPairs);
+        static extern ServerCredentialsSafeHandle grpcsharp_ssl_server_credentials_create(string pemRootCerts, string[] keyCertPairCertChainArray, string[] keyCertPairPrivateKeyArray, UIntPtr numKeyCertPairs, bool forceClientAuth);
 
         [DllImport("grpc_csharp_ext.dll")]
         static extern void grpcsharp_server_credentials_release(IntPtr credentials);
@@ -51,12 +51,13 @@ namespace Grpc.Core.Internal
         {
         }
 
-        public static ServerCredentialsSafeHandle CreateSslCredentials(string[] keyCertPairCertChainArray, string[] keyCertPairPrivateKeyArray)
+        public static ServerCredentialsSafeHandle CreateSslCredentials(string pemRootCerts, string[] keyCertPairCertChainArray, string[] keyCertPairPrivateKeyArray, bool forceClientAuth)
         {
             Preconditions.CheckArgument(keyCertPairCertChainArray.Length == keyCertPairPrivateKeyArray.Length);
-            return grpcsharp_ssl_server_credentials_create(null,
+            return grpcsharp_ssl_server_credentials_create(pemRootCerts,
                                                            keyCertPairCertChainArray, keyCertPairPrivateKeyArray,
-                                                           new UIntPtr((ulong)keyCertPairCertChainArray.Length));
+                                                           new UIntPtr((ulong)keyCertPairCertChainArray.Length),
+                                                           forceClientAuth);
         }
 
         protected override bool ReleaseHandle()
diff --git a/src/csharp/Grpc.Core/Internal/ServerSafeHandle.cs b/src/csharp/Grpc.Core/Internal/ServerSafeHandle.cs
index 9e1170e6dd..f9b44b1acf 100644
--- a/src/csharp/Grpc.Core/Internal/ServerSafeHandle.cs
+++ b/src/csharp/Grpc.Core/Internal/ServerSafeHandle.cs
@@ -48,7 +48,7 @@ namespace Grpc.Core.Internal
         static extern ServerSafeHandle grpcsharp_server_create(CompletionQueueSafeHandle cq, ChannelArgsSafeHandle args);
 
         [DllImport("grpc_csharp_ext.dll")]
-        static extern int grpcsharp_server_add_http2_port(ServerSafeHandle server, string addr);
+        static extern int grpcsharp_server_add_insecure_http2_port(ServerSafeHandle server, string addr);
 
         [DllImport("grpc_csharp_ext.dll")]
         static extern int grpcsharp_server_add_secure_http2_port(ServerSafeHandle server, string addr, ServerCredentialsSafeHandle creds);
@@ -77,12 +77,12 @@ namespace Grpc.Core.Internal
             return grpcsharp_server_create(cq, args);
         }
 
-        public int AddListeningPort(string addr)
+        public int AddInsecurePort(string addr)
         {
-            return grpcsharp_server_add_http2_port(this, addr);
+            return grpcsharp_server_add_insecure_http2_port(this, addr);
         }
 
-        public int AddListeningPort(string addr, ServerCredentialsSafeHandle credentials)
+        public int AddSecurePort(string addr, ServerCredentialsSafeHandle credentials)
         {
             return grpcsharp_server_add_secure_http2_port(this, addr, credentials);
         }
diff --git a/src/csharp/Grpc.Core/Internal/Timespec.cs b/src/csharp/Grpc.Core/Internal/Timespec.cs
index da2819f14d..e83d21f4a4 100644
--- a/src/csharp/Grpc.Core/Internal/Timespec.cs
+++ b/src/csharp/Grpc.Core/Internal/Timespec.cs
@@ -32,6 +32,8 @@ using System;
 using System.Runtime.InteropServices;
 using System.Threading;
 
+using Grpc.Core.Utils;
+
 namespace Grpc.Core.Internal
 {
     /// <summary>
@@ -40,32 +42,43 @@ namespace Grpc.Core.Internal
     [StructLayout(LayoutKind.Sequential)]
     internal struct Timespec
     {
-        const int NanosPerSecond = 1000 * 1000 * 1000;
-        const int NanosPerTick = 100;
+        const long NanosPerSecond = 1000 * 1000 * 1000;
+        const long NanosPerTick = 100;
+        const long TicksPerSecond = NanosPerSecond / NanosPerTick;
 
         static readonly DateTime UnixEpoch = new DateTime(1970, 1, 1, 0, 0, 0, 0, DateTimeKind.Utc);
 
         [DllImport("grpc_csharp_ext.dll")]
-        static extern Timespec gprsharp_now();
+        static extern Timespec gprsharp_now(GPRClockType clockType);
+
+        [DllImport("grpc_csharp_ext.dll")]
+        static extern Timespec gprsharp_inf_future(GPRClockType clockType);
+
+        [DllImport("grpc_csharp_ext.dll")]
+        static extern Timespec gprsharp_inf_past(GPRClockType clockType);
 
         [DllImport("grpc_csharp_ext.dll")]
-        static extern Timespec gprsharp_inf_future();
+        static extern Timespec gprsharp_convert_clock_type(Timespec t, GPRClockType targetClock);
 
         [DllImport("grpc_csharp_ext.dll")]
         static extern int gprsharp_sizeof_timespec();
 
-        public Timespec(IntPtr tv_sec, int tv_nsec)
+        public Timespec(IntPtr tv_sec, int tv_nsec) : this(tv_sec, tv_nsec, GPRClockType.Realtime)
+        {
+        }
+
+        public Timespec(IntPtr tv_sec, int tv_nsec, GPRClockType clock_type)
         {
             this.tv_sec = tv_sec;
             this.tv_nsec = tv_nsec;
-            this.clock_type = GPRClockType.Realtime;
+            this.clock_type = clock_type;
         }
 
         // NOTE: on linux 64bit  sizeof(gpr_timespec) = 16, on windows 32bit sizeof(gpr_timespec) = 8
         // so IntPtr seems to have the right size to work on both.
-        public System.IntPtr tv_sec;
-        public int tv_nsec;
-        public GPRClockType clock_type;
+        private System.IntPtr tv_sec;
+        private int tv_nsec;
+        private GPRClockType clock_type;
 
         /// <summary>
         /// Timespec a long time in the future.
@@ -74,54 +87,164 @@ namespace Grpc.Core.Internal
         {
             get
             {
-                return gprsharp_inf_future();
+                return gprsharp_inf_future(GPRClockType.Realtime);
+            }
+        }
+
+        /// <summary>
+        /// Timespec a long time in the past.
+        /// </summary>
+        public static Timespec InfPast
+        {
+            get
+            {
+                return gprsharp_inf_past(GPRClockType.Realtime);
             }
         }
 
+        /// <summary>
+        /// Return Timespec representing the current time.
+        /// </summary>
         public static Timespec Now
         {
             get
             {
-                return gprsharp_now();
+                return gprsharp_now(GPRClockType.Realtime);
             }
         }
-            
-        public DateTime ToDateTime()
+
+        /// <summary>
+        /// Seconds since unix epoch.
+        /// </summary>
+        public IntPtr TimevalSeconds
         {
-            return UnixEpoch.AddTicks(tv_sec.ToInt64() * (NanosPerSecond / NanosPerTick) + tv_nsec / NanosPerTick);
+            get
+            {
+                return tv_sec;
+            }
         }
 
-        internal static int NativeSize
+        /// <summary>
+        /// The nanoseconds part of timeval.
+        /// </summary>
+        public int TimevalNanos
         {
             get
             {
-                return gprsharp_sizeof_timespec();
+                return tv_nsec;
             }
         }
 
         /// <summary>
-        /// Creates a GPR deadline from current instant and given timeout.
+        /// Converts the timespec to desired clock type.
         /// </summary>
-        /// <returns>The from timeout.</returns>
-        public static Timespec DeadlineFromTimeout(TimeSpan timeout)
+        public Timespec ToClockType(GPRClockType targetClock)
+        {
+            return gprsharp_convert_clock_type(this, targetClock);
+        }
+            
+        /// <summary>
+        /// Converts Timespec to DateTime.
+        /// Timespec needs to be of type GPRClockType.Realtime and needs to represent a legal value.
+        /// DateTime has lower resolution (100ns), so rounding can occurs.
+        /// Value are always rounded up to the nearest DateTime value in the future.
+        /// 
+        /// For Timespec.InfFuture or if timespec is after the largest representable DateTime, DateTime.MaxValue is returned.
+        /// For Timespec.InfPast or if timespec is before the lowest representable DateTime, DateTime.MinValue is returned.
+        /// 
+        /// Unless DateTime.MaxValue or DateTime.MinValue is returned, the resulting DateTime is always in UTC
+        /// (DateTimeKind.Utc)
+        /// </summary>
+        public DateTime ToDateTime()
         {
-            if (timeout == Timeout.InfiniteTimeSpan)
+            Preconditions.CheckState(tv_nsec >= 0 && tv_nsec < NanosPerSecond);
+            Preconditions.CheckState(clock_type == GPRClockType.Realtime);
+
+            // fast path for InfFuture
+            if (this.Equals(InfFuture))
+            {
+                return DateTime.MaxValue;
+            }
+
+            // fast path for InfPast
+            if (this.Equals(InfPast))
+            {
+                return DateTime.MinValue;
+            }
+
+            try
+            {
+                // convert nanos to ticks, round up to the nearest tick
+                long ticksFromNanos = tv_nsec / NanosPerTick + ((tv_nsec % NanosPerTick != 0) ? 1 : 0);
+                long ticksTotal = checked(tv_sec.ToInt64() * TicksPerSecond + ticksFromNanos);
+                return UnixEpoch.AddTicks(ticksTotal);
+            }
+            catch (OverflowException)
+            {
+                // ticks out of long range
+                return tv_sec.ToInt64() > 0 ? DateTime.MaxValue : DateTime.MinValue;
+            }
+            catch (ArgumentOutOfRangeException)
+            {
+                // resulting date time would be larger than MaxValue
+                return tv_sec.ToInt64() > 0 ? DateTime.MaxValue : DateTime.MinValue;
+            }
+        }
+            
+        /// <summary>
+        /// Creates DateTime to Timespec.
+        /// DateTime has to be in UTC (DateTimeKind.Utc) unless it's DateTime.MaxValue or DateTime.MinValue.
+        /// For DateTime.MaxValue of date time after the largest representable Timespec, Timespec.InfFuture is returned.
+        /// For DateTime.MinValue of date time before the lowest representable Timespec, Timespec.InfPast is returned.
+        /// </summary>
+        /// <returns>The date time.</returns>
+        /// <param name="dateTime">Date time.</param>
+        public static Timespec FromDateTime(DateTime dateTime)
+        {
+            if (dateTime == DateTime.MaxValue)
             {
                 return Timespec.InfFuture;
             }
-            return Timespec.Now.Add(timeout);
+
+            if (dateTime == DateTime.MinValue)
+            {
+                return Timespec.InfPast;
+            }
+
+            Preconditions.CheckArgument(dateTime.Kind == DateTimeKind.Utc, "dateTime");
+
+            try
+            {
+                TimeSpan timeSpan = dateTime - UnixEpoch;
+                long ticks = timeSpan.Ticks;
+
+                long seconds = ticks / TicksPerSecond;  
+                int nanos = (int)((ticks % TicksPerSecond) * NanosPerTick);
+                if (nanos < 0) 
+                {
+                    // correct the result based on C# modulo semantics for negative dividend
+                    seconds--;
+                    nanos += (int)NanosPerSecond;
+                }
+                // new IntPtr possibly throws OverflowException
+                return new Timespec(new IntPtr(seconds), nanos);
+            }
+            catch (OverflowException)
+            {
+                return dateTime > UnixEpoch ? Timespec.InfFuture : Timespec.InfPast;
+            }
+            catch (ArgumentOutOfRangeException)
+            {
+                return dateTime > UnixEpoch ? Timespec.InfFuture : Timespec.InfPast;
+            }
         }
 
-        public Timespec Add(TimeSpan timeSpan)
+        internal static int NativeSize
         {
-            long nanos = (long)tv_nsec + (timeSpan.Ticks % TimeSpan.TicksPerSecond) * NanosPerTick;
-            long overflow_sec = (nanos > NanosPerSecond) ? 1 : 0;
-
-            Timespec result;
-            result.tv_nsec = (int)(nanos % NanosPerSecond);
-            result.tv_sec = new IntPtr(tv_sec.ToInt64() + (timeSpan.Ticks / TimeSpan.TicksPerSecond) + overflow_sec);
-            result.clock_type = GPRClockType.Realtime;
-            return result;
+            get
+            {
+                return gprsharp_sizeof_timespec();
+            }
         }
     }
 }
diff --git a/src/csharp/Grpc.Core/KeyCertificatePair.cs b/src/csharp/Grpc.Core/KeyCertificatePair.cs
new file mode 100644
index 0000000000..5def15a656
--- /dev/null
+++ b/src/csharp/Grpc.Core/KeyCertificatePair.cs
@@ -0,0 +1,83 @@
+#region Copyright notice and license
+
+// Copyright 2015, Google Inc.
+// All rights reserved.
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+#endregion
+
+using System;
+using System.Collections.Generic;
+
+using Grpc.Core.Internal;
+using Grpc.Core.Utils;
+
+namespace Grpc.Core
+{
+    /// <summary>
+    /// Key certificate pair (in PEM encoding).
+    /// </summary>
+    public sealed class KeyCertificatePair
+    {
+        readonly string certificateChain;
+        readonly string privateKey;
+
+        /// <summary>
+        /// Creates a new certificate chain - private key pair.
+        /// </summary>
+        /// <param name="certificateChain">PEM encoded certificate chain.</param>
+        /// <param name="privateKey">PEM encoded private key.</param>
+        public KeyCertificatePair(string certificateChain, string privateKey)
+        {
+            this.certificateChain = Preconditions.CheckNotNull(certificateChain);
+            this.privateKey = Preconditions.CheckNotNull(privateKey);
+        }
+
+        /// <summary>
+        /// PEM encoded certificate chain.
+        /// </summary>
+        public string CertificateChain
+        {
+            get
+            {
+                return certificateChain;
+            }
+        }
+
+        /// <summary>
+        /// PEM encoded private key.
+        /// </summary>
+        public string PrivateKey
+        {
+            get
+            {
+                return privateKey;
+            }
+        }
+    }
+}
diff --git a/src/csharp/Grpc.Core/Logging/ConsoleLogger.cs b/src/csharp/Grpc.Core/Logging/ConsoleLogger.cs
new file mode 100644
index 0000000000..c67765c78d
--- /dev/null
+++ b/src/csharp/Grpc.Core/Logging/ConsoleLogger.cs
@@ -0,0 +1,103 @@
+#region Copyright notice and license
+
+// Copyright 2015, Google Inc.
+// All rights reserved.
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+#endregion
+
+using System;
+using System.Collections.Generic;
+
+namespace Grpc.Core.Logging
+{
+    /// <summary>Logger that logs to System.Console.</summary>
+    public class ConsoleLogger : ILogger
+    {
+        readonly Type forType;
+        readonly string forTypeString;
+
+        public ConsoleLogger() : this(null)
+        {
+        }
+
+        private ConsoleLogger(Type forType)
+        {
+            this.forType = forType;
+            this.forTypeString = forType != null ? forType.FullName + " " : "";
+        }
+
+        public ILogger ForType<T>()
+        {
+            if (typeof(T) == forType)
+            {
+                return this;
+            }
+            return new ConsoleLogger(typeof(T));
+        }
+
+        public void Debug(string message, params object[] formatArgs)
+        {
+            Log("D", message, formatArgs);
+        }
+
+        public void Info(string message, params object[] formatArgs)
+        {
+            Log("I", message, formatArgs);
+        }
+
+        public void Warning(string message, params object[] formatArgs)
+        {
+            Log("W", message, formatArgs);
+        }
+
+        public void Warning(Exception exception, string message, params object[] formatArgs)
+        {
+            Log("W", message + " " + exception, formatArgs);
+        }
+
+        public void Error(string message, params object[] formatArgs)
+        {
+            Log("E", message, formatArgs);
+        }
+
+        public void Error(Exception exception, string message, params object[] formatArgs)
+        {
+            Log("E", message + " " + exception, formatArgs);
+        }
+
+        private void Log(string severityString, string message, object[] formatArgs)
+        {
+            Console.Error.WriteLine("{0}{1} {2}{3}",
+                severityString,
+                DateTime.Now,
+                forTypeString,
+                string.Format(message, formatArgs));
+        }
+    }
+}
diff --git a/src/csharp/Grpc.Core/Logging/ILogger.cs b/src/csharp/Grpc.Core/Logging/ILogger.cs
new file mode 100644
index 0000000000..0d58f133e3
--- /dev/null
+++ b/src/csharp/Grpc.Core/Logging/ILogger.cs
@@ -0,0 +1,57 @@
+#region Copyright notice and license
+
+// Copyright 2015, Google Inc.
+// All rights reserved.
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+#endregion
+
+using System;
+using System.Collections.Generic;
+
+namespace Grpc.Core.Logging
+{
+    /// <summary>For logging messages.</summary>
+    public interface ILogger
+    {
+        /// <summary>Returns a logger associated with the specified type.</summary>
+        ILogger ForType<T>();
+
+        void Debug(string message, params object[] formatArgs);
+
+        void Info(string message, params object[] formatArgs);
+
+        void Warning(string message, params object[] formatArgs);
+
+        void Warning(Exception exception, string message, params object[] formatArgs);
+
+        void Error(string message, params object[] formatArgs);
+
+        void Error(Exception exception, string message, params object[] formatArgs);
+    }
+}
diff --git a/src/csharp/Grpc.Core/Metadata.cs b/src/csharp/Grpc.Core/Metadata.cs
index 2f308cbb11..6fd0a7109d 100644
--- a/src/csharp/Grpc.Core/Metadata.cs
+++ b/src/csharp/Grpc.Core/Metadata.cs
@@ -32,7 +32,6 @@
 using System;
 using System.Collections;
 using System.Collections.Generic;
-using System.Collections.Immutable;
 using System.Collections.Specialized;
 using System.Runtime.InteropServices;
 using System.Text;
diff --git a/src/csharp/Grpc.Core/Method.cs b/src/csharp/Grpc.Core/Method.cs
index 77d36191c3..cc047ac9f8 100644
--- a/src/csharp/Grpc.Core/Method.cs
+++ b/src/csharp/Grpc.Core/Method.cs
@@ -53,16 +53,20 @@ namespace Grpc.Core
     public class Method<TRequest, TResponse>
     {
         readonly MethodType type;
+        readonly string serviceName;
         readonly string name;
         readonly Marshaller<TRequest> requestMarshaller;
         readonly Marshaller<TResponse> responseMarshaller;
+        readonly string fullName;
 
-        public Method(MethodType type, string name, Marshaller<TRequest> requestMarshaller, Marshaller<TResponse> responseMarshaller)
+        public Method(MethodType type, string serviceName, string name, Marshaller<TRequest> requestMarshaller, Marshaller<TResponse> responseMarshaller)
         {
             this.type = type;
-            this.name = name;
-            this.requestMarshaller = requestMarshaller;
-            this.responseMarshaller = responseMarshaller;
+            this.serviceName = Preconditions.CheckNotNull(serviceName);
+            this.name = Preconditions.CheckNotNull(name);
+            this.requestMarshaller = Preconditions.CheckNotNull(requestMarshaller);
+            this.responseMarshaller = Preconditions.CheckNotNull(responseMarshaller);
+            this.fullName = GetFullName(serviceName);
         }
 
         public MethodType Type
@@ -72,6 +76,14 @@ namespace Grpc.Core
                 return this.type;
             }
         }
+            
+        public string ServiceName
+        {
+            get
+            {
+                return this.serviceName;
+            }
+        }
 
         public string Name
         {
@@ -97,6 +109,14 @@ namespace Grpc.Core
             }
         }
 
+        public string FullName
+        {
+            get
+            {
+                return this.fullName;
+            }
+        }
+
         /// <summary>
         /// Gets full name of the method including the service name.
         /// </summary>
diff --git a/src/csharp/Grpc.Core/Properties/AssemblyInfo.cs b/src/csharp/Grpc.Core/Properties/AssemblyInfo.cs
index 2b3d7530f2..29db85d7aa 100644
--- a/src/csharp/Grpc.Core/Properties/AssemblyInfo.cs
+++ b/src/csharp/Grpc.Core/Properties/AssemblyInfo.cs
@@ -10,4 +10,12 @@ using System.Runtime.CompilerServices;
 [assembly: AssemblyTrademark("")]
 [assembly: AssemblyCulture("")]
 
+#if SIGNED
+[assembly: InternalsVisibleTo("Grpc.Core.Tests,PublicKey=" +
+    "00240000048000009400000006020000002400005253413100040000010001002f5797a92c6fcde81bd4098f43" +
+    "0442bb8e12768722de0b0cb1b15e955b32a11352740ee59f2c94c48edc8e177d1052536b8ac651bce11ce5da3a" +
+    "27fc95aff3dc604a6971417453f9483c7b5e836756d5b271bf8f2403fe186e31956148c03d804487cf642f8cc0" +
+    "71394ee9672dfe5b55ea0f95dfd5a7f77d22c962ccf51320d3")]
+#else
 [assembly: InternalsVisibleTo("Grpc.Core.Tests")]
+#endif
\ No newline at end of file
diff --git a/src/csharp/Grpc.Core/Server.cs b/src/csharp/Grpc.Core/Server.cs
index fd30735359..eb5b043d1c 100644
--- a/src/csharp/Grpc.Core/Server.cs
+++ b/src/csharp/Grpc.Core/Server.cs
@@ -32,12 +32,13 @@
 #endregion
 
 using System;
-using System.Collections.Concurrent;
+using System.Collections;
 using System.Collections.Generic;
 using System.Diagnostics;
 using System.Runtime.InteropServices;
 using System.Threading.Tasks;
 using Grpc.Core.Internal;
+using Grpc.Core.Logging;
 using Grpc.Core.Utils;
 
 namespace Grpc.Core
@@ -47,16 +48,17 @@ namespace Grpc.Core
     /// </summary>
     public class Server
     {
-        /// <summary>
-        /// Pass this value as port to have the server choose an unused listening port for you.
-        /// </summary>
-        public const int PickUnusedPort = 0;
+        static readonly ILogger Logger = GrpcEnvironment.Logger.ForType<Server>();
 
+        readonly ServiceDefinitionCollection serviceDefinitions;
+        readonly ServerPortCollection ports;
         readonly GrpcEnvironment environment;
         readonly List<ChannelOption> options;
         readonly ServerSafeHandle handle;
         readonly object myLock = new object();
 
+        readonly List<ServerServiceDefinition> serviceDefinitionsList = new List<ServerServiceDefinition>();
+        readonly List<ServerPort> serverPortList = new List<ServerPort>();
         readonly Dictionary<string, IServerCallHandler> callHandlers = new Dictionary<string, IServerCallHandler>();
         readonly TaskCompletionSource<object> shutdownTcs = new TaskCompletionSource<object>();
 
@@ -69,6 +71,8 @@ namespace Grpc.Core
         /// <param name="options">Channel options.</param>
         public Server(IEnumerable<ChannelOption> options = null)
         {
+            this.serviceDefinitions = new ServiceDefinitionCollection(this);
+            this.ports = new ServerPortCollection(this);
             this.environment = GrpcEnvironment.GetInstance();
             this.options = options != null ? new List<ChannelOption>(options) : new List<ChannelOption>();
             using (var channelArgs = ChannelOptions.CreateChannelArgs(this.options))
@@ -78,45 +82,27 @@ namespace Grpc.Core
         }
 
         /// <summary>
-        /// Adds a service definition to the server. This is how you register
-        /// handlers for a service with the server.
-        /// Only call this before Start().
+        /// Services that will be exported by the server once started. Register a service with this
+        /// server by adding its definition to this collection.
         /// </summary>
-        public void AddServiceDefinition(ServerServiceDefinition serviceDefinition)
+        public ServiceDefinitionCollection Services
         {
-            lock (myLock)
+            get
             {
-                Preconditions.CheckState(!startRequested);
-                foreach (var entry in serviceDefinition.CallHandlers)
-                {
-                    callHandlers.Add(entry.Key, entry.Value);
-                }
+                return serviceDefinitions;
             }
         }
 
         /// <summary>
-        /// Add a non-secure port on which server should listen.
-        /// Only call this before Start().
+        /// Ports on which the server will listen once started. Register a port with this
+        /// server by adding its definition to this collection.
         /// </summary>
-        /// <returns>The port on which server will be listening.</returns>
-        /// <param name="host">the host</param>
-        /// <param name="port">the port. If zero, an unused port is chosen automatically.</param>
-        public int AddListeningPort(string host, int port)
+        public ServerPortCollection Ports
         {
-            return AddListeningPortInternal(host, port, null);
-        }
-
-        /// <summary>
-        /// Add a non-secure port on which server should listen.
-        /// Only call this before Start().
-        /// </summary>
-        /// <returns>The port on which server will be listening.</returns>
-        /// <param name="host">the host</param>
-        /// <param name="port">the port. If zero, an unused port is chosen automatically.</param>
-        public int AddListeningPort(string host, int port, ServerCredentials credentials)
-        {
-            Preconditions.CheckNotNull(credentials);
-            return AddListeningPortInternal(host, port, credentials);
+            get
+            {
+                return ports;
+            }
         }
 
         /// <summary>
@@ -183,23 +169,47 @@ namespace Grpc.Core
             handle.Dispose();
         }
 
-        private int AddListeningPortInternal(string host, int port, ServerCredentials credentials)
+        /// <summary>
+        /// Adds a service definition.
+        /// </summary>
+        private void AddServiceDefinitionInternal(ServerServiceDefinition serviceDefinition)
         {
             lock (myLock)
             {
-                Preconditions.CheckState(!startRequested);    
-                var address = string.Format("{0}:{1}", host, port);
-                if (credentials != null)
+                Preconditions.CheckState(!startRequested);
+                foreach (var entry in serviceDefinition.CallHandlers)
                 {
-                    using (var nativeCredentials = credentials.ToNativeCredentials())
-                    {
-                        return handle.AddListeningPort(address, nativeCredentials);
-                    }
+                    callHandlers.Add(entry.Key, entry.Value);
                 }
-                else
+                serviceDefinitionsList.Add(serviceDefinition);
+            }
+        }
+
+        /// <summary>
+        /// Adds a listening port.
+        /// </summary>
+        private int AddPortInternal(ServerPort serverPort)
+        {
+            lock (myLock)
+            {
+                Preconditions.CheckNotNull(serverPort.Credentials);
+                Preconditions.CheckState(!startRequested);
+                var address = string.Format("{0}:{1}", serverPort.Host, serverPort.Port);
+                int boundPort;
+                using (var nativeCredentials = serverPort.Credentials.ToNativeCredentials())
                 {
-                    return handle.AddListeningPort(address);    
+                    if (nativeCredentials != null)
+                    {
+                        boundPort = handle.AddSecurePort(address, nativeCredentials);
+                    }
+                    else
+                    {
+                        boundPort = handle.AddInsecurePort(address);
+                    }
                 }
+                var newServerPort = new ServerPort(serverPort, boundPort);
+                this.serverPortList.Add(newServerPort);
+                return boundPort;
             }
         }
 
@@ -233,7 +243,7 @@ namespace Grpc.Core
             }
             catch (Exception e)
             {
-                Console.WriteLine("Exception while handling RPC: " + e);
+                Logger.Warning(e, "Exception while handling RPC.");
             }
         }
 
@@ -263,5 +273,82 @@ namespace Grpc.Core
         {
             shutdownTcs.SetResult(null);
         }
+
+        /// <summary>
+        /// Collection of service definitions.
+        /// </summary>
+        public class ServiceDefinitionCollection : IEnumerable<ServerServiceDefinition>
+        {
+            readonly Server server;
+
+            internal ServiceDefinitionCollection(Server server)
+            {
+                this.server = server;
+            }
+
+            /// <summary>
+            /// Adds a service definition to the server. This is how you register
+            /// handlers for a service with the server. Only call this before Start().
+            /// </summary>
+            public void Add(ServerServiceDefinition serviceDefinition)
+            {
+                server.AddServiceDefinitionInternal(serviceDefinition);
+            }
+
+            public IEnumerator<ServerServiceDefinition> GetEnumerator()
+            {
+                return server.serviceDefinitionsList.GetEnumerator();
+            }
+
+            IEnumerator IEnumerable.GetEnumerator()
+            {
+                return server.serviceDefinitionsList.GetEnumerator();
+            }
+        }
+
+        /// <summary>
+        /// Collection of server ports.
+        /// </summary>
+        public class ServerPortCollection : IEnumerable<ServerPort>
+        {
+            readonly Server server;
+
+            internal ServerPortCollection(Server server)
+            {
+                this.server = server;
+            }
+
+            /// <summary>
+            /// Adds a new port on which server should listen.
+            /// Only call this before Start().
+            /// <returns>The port on which server will be listening.</returns>
+            /// </summary>
+            public int Add(ServerPort serverPort)
+            {
+                return server.AddPortInternal(serverPort);
+            }
+
+            /// <summary>
+            /// Adds a new port on which server should listen.
+            /// <returns>The port on which server will be listening.</returns>
+            /// </summary>
+            /// <param name="host">the host</param>
+            /// <param name="port">the port. If zero, an unused port is chosen automatically.</param>
+            /// <param name="credentials">credentials to use to secure this port.</param>
+            public int Add(string host, int port, ServerCredentials credentials)
+            {
+                return Add(new ServerPort(host, port, credentials));
+            }
+
+            public IEnumerator<ServerPort> GetEnumerator()
+            {
+                return server.serverPortList.GetEnumerator();
+            }
+
+            IEnumerator IEnumerable.GetEnumerator()
+            {
+                return server.serverPortList.GetEnumerator();
+            }
+        }
     }
 }
diff --git a/src/csharp/Grpc.Core/ServerCallContext.cs b/src/csharp/Grpc.Core/ServerCallContext.cs
index 17a2eefd07..032b1390db 100644
--- a/src/csharp/Grpc.Core/ServerCallContext.cs
+++ b/src/csharp/Grpc.Core/ServerCallContext.cs
@@ -47,6 +47,7 @@ namespace Grpc.Core
 
         private readonly string method;
         private readonly string host;
+        private readonly string peer;
         private readonly DateTime deadline;
         private readonly Metadata requestHeaders;
         private readonly CancellationToken cancellationToken;
@@ -54,16 +55,17 @@ namespace Grpc.Core
 
         private Status status = Status.DefaultSuccess;
 
-        public ServerCallContext(string method, string host, DateTime deadline, Metadata requestHeaders, CancellationToken cancellationToken)
+        public ServerCallContext(string method, string host, string peer, DateTime deadline, Metadata requestHeaders, CancellationToken cancellationToken)
         {
             this.method = method;
             this.host = host;
+            this.peer = peer;
             this.deadline = deadline;
             this.requestHeaders = requestHeaders;
             this.cancellationToken = cancellationToken;
         }
             
-        /// <summary> Name of method called in this RPC. </summary>
+        /// <summary>Name of method called in this RPC.</summary>
         public string Method
         {
             get
@@ -72,7 +74,7 @@ namespace Grpc.Core
             }
         }
 
-        /// <summary> Name of host called in this RPC. </summary>
+        /// <summary>Name of host called in this RPC.</summary>
         public string Host
         {
             get
@@ -81,7 +83,16 @@ namespace Grpc.Core
             }
         }
 
-        /// <summary> Deadline for this RPC. </summary>
+        /// <summary>Address of the remote endpoint in URI format.</summary>
+        public string Peer
+        {
+            get
+            {
+                return this.peer;
+            }
+        }
+
+        /// <summary>Deadline for this RPC.</summary>
         public DateTime Deadline
         {
             get
@@ -90,7 +101,7 @@ namespace Grpc.Core
             }
         }
 
-        /// <summary> Initial metadata sent by client. </summary>
+        /// <summary>Initial metadata sent by client.</summary>
         public Metadata RequestHeaders
         {
             get
@@ -99,8 +110,7 @@ namespace Grpc.Core
             }
         }
 
-        // TODO(jtattermusch): support signalling cancellation.
-        /// <summary> Cancellation token signals when call is cancelled. </summary>
+        ///<summary>Cancellation token signals when call is cancelled.</summary>
         public CancellationToken CancellationToken
         {
             get
@@ -109,7 +119,7 @@ namespace Grpc.Core
             }
         }
 
-        /// <summary> Trailers to send back to client after RPC finishes.</summary>
+        /// <summary>Trailers to send back to client after RPC finishes.</summary>
         public Metadata ResponseTrailers
         {
             get
diff --git a/src/csharp/Grpc.Core/ServerCredentials.cs b/src/csharp/Grpc.Core/ServerCredentials.cs
index ab7d0b4914..c11a1ede08 100644
--- a/src/csharp/Grpc.Core/ServerCredentials.cs
+++ b/src/csharp/Grpc.Core/ServerCredentials.cs
@@ -33,8 +33,8 @@
 
 using System;
 using System.Collections.Generic;
-using System.Collections.Immutable;
 using Grpc.Core.Internal;
+using Grpc.Core.Utils;
 
 namespace Grpc.Core
 {
@@ -43,67 +43,118 @@ namespace Grpc.Core
     /// </summary>
     public abstract class ServerCredentials
     {
+        static readonly ServerCredentials InsecureInstance = new InsecureServerCredentialsImpl();
+
+        /// <summary>
+        /// Returns instance of credential that provides no security and 
+        /// will result in creating an unsecure server port with no encryption whatsoever.
+        /// </summary>
+        public static ServerCredentials Insecure
+        {
+            get
+            {
+                return InsecureInstance;
+            }
+        }
+
         /// <summary>
         /// Creates native object for the credentials.
         /// </summary>
         /// <returns>The native credentials.</returns>
         internal abstract ServerCredentialsSafeHandle ToNativeCredentials();
+
+        private sealed class InsecureServerCredentialsImpl : ServerCredentials
+        {
+            internal override ServerCredentialsSafeHandle ToNativeCredentials()
+            {
+                return null;
+            }
+        }
     }
 
     /// <summary>
-    /// Key certificate pair (in PEM encoding).
+    /// Server-side SSL credentials.
     /// </summary>
-    public class KeyCertificatePair
+    public class SslServerCredentials : ServerCredentials
     {
-        readonly string certChain;
-        readonly string privateKey;
+        readonly IList<KeyCertificatePair> keyCertificatePairs;
+        readonly string rootCertificates;
+        readonly bool forceClientAuth;
 
-        public KeyCertificatePair(string certChain, string privateKey)
+        /// <summary>
+        /// Creates server-side SSL credentials.
+        /// </summary>
+        /// <param name="keyCertificatePairs">Key-certificates to use.</param>
+        /// <param name="rootCertificates">PEM encoded client root certificates used to authenticate client.</param>
+        /// <param name="forceClientAuth">If true, client will be rejected unless it proves its unthenticity using against rootCertificates.</param>
+        public SslServerCredentials(IEnumerable<KeyCertificatePair> keyCertificatePairs, string rootCertificates, bool forceClientAuth)
         {
-            this.certChain = certChain;
-            this.privateKey = privateKey;
+            this.keyCertificatePairs = new List<KeyCertificatePair>(keyCertificatePairs).AsReadOnly();
+            Preconditions.CheckArgument(this.keyCertificatePairs.Count > 0,
+                "At least one KeyCertificatePair needs to be provided");
+            if (forceClientAuth)
+            {
+                Preconditions.CheckNotNull(rootCertificates,
+                    "Cannot force client authentication unless you provide rootCertificates.");
+            }
+            this.rootCertificates = rootCertificates;
+            this.forceClientAuth = forceClientAuth;
         }
 
-        public string CertChain
+        /// <summary>
+        /// Creates server-side SSL credentials.
+        /// This constructor should be use if you do not wish to autheticate client
+        /// using client root certificates.
+        /// </summary>
+        /// <param name="keyCertificatePairs">Key-certificates to use.</param>
+        public SslServerCredentials(IEnumerable<KeyCertificatePair> keyCertificatePairs) : this(keyCertificatePairs, null, false)
+        {
+        }
+
+        /// <summary>
+        /// Key-certificate pairs.
+        /// </summary>
+        public IList<KeyCertificatePair> KeyCertificatePairs
         {
             get
             {
-                return certChain;
+                return this.keyCertificatePairs;
             }
         }
 
-        public string PrivateKey
+        /// <summary>
+        /// PEM encoded client root certificates.
+        /// </summary>
+        public string RootCertificates
         {
             get
             {
-                return privateKey;
+                return this.rootCertificates;
             }
         }
-    }
-
-    /// <summary>
-    /// Server-side SSL credentials.
-    /// </summary>
-    public class SslServerCredentials : ServerCredentials
-    {
-        ImmutableList<KeyCertificatePair> keyCertPairs;
 
-        public SslServerCredentials(ImmutableList<KeyCertificatePair> keyCertPairs)
+        /// <summary>
+        /// If true, the authenticity of client check will be enforced.
+        /// </summary>
+        public bool ForceClientAuthentication
         {
-            this.keyCertPairs = keyCertPairs;
+            get
+            {
+                return this.forceClientAuth;
+            }
         }
 
         internal override ServerCredentialsSafeHandle ToNativeCredentials()
         {
-            int count = keyCertPairs.Count;
+            int count = keyCertificatePairs.Count;
             string[] certChains = new string[count];
             string[] keys = new string[count];
             for (int i = 0; i < count; i++)
             {
-                certChains[i] = keyCertPairs[i].CertChain;
-                keys[i] = keyCertPairs[i].PrivateKey;
+                certChains[i] = keyCertificatePairs[i].CertificateChain;
+                keys[i] = keyCertificatePairs[i].PrivateKey;
             }
-            return ServerCredentialsSafeHandle.CreateSslCredentials(certChains, keys);
+            return ServerCredentialsSafeHandle.CreateSslCredentials(rootCertificates, certChains, keys, forceClientAuth);
         }
     }
 }
diff --git a/src/csharp/Grpc.Core/ServerPort.cs b/src/csharp/Grpc.Core/ServerPort.cs
new file mode 100644
index 0000000000..55e4bd0062
--- /dev/null
+++ b/src/csharp/Grpc.Core/ServerPort.cs
@@ -0,0 +1,120 @@
+#region Copyright notice and license
+
+// Copyright 2015, Google Inc.
+// All rights reserved.
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+#endregion
+
+using System;
+
+using Grpc.Core.Utils;
+
+namespace Grpc.Core
+{
+    /// <summary>
+    /// A port exposed by a server.
+    /// </summary>
+    public class ServerPort
+    {
+        /// <summary>
+        /// Pass this value as port to have the server choose an unused listening port for you.
+        /// Ports added to a server will contain the bound port in their <see cref="BoundPort"/> property.
+        /// </summary>
+        public const int PickUnused = 0;
+
+        readonly string host;
+        readonly int port;
+        readonly ServerCredentials credentials;
+        readonly int boundPort;
+
+        /// <summary>
+        /// Creates a new port on which server should listen.
+        /// </summary>
+        /// <returns>The port on which server will be listening.</returns>
+        /// <param name="host">the host</param>
+        /// <param name="port">the port. If zero, an unused port is chosen automatically.</param>
+        /// <param name="credentials">credentials to use to secure this port.</param>
+        public ServerPort(string host, int port, ServerCredentials credentials)
+        {
+            this.host = Preconditions.CheckNotNull(host);
+            this.port = port;
+            this.credentials = Preconditions.CheckNotNull(credentials);
+        }
+
+        /// <summary>
+        /// Creates a port from an existing <c>ServerPort</c> instance and boundPort value.
+        /// </summary>
+        internal ServerPort(ServerPort serverPort, int boundPort)
+        {
+            this.host = serverPort.host;
+            this.port = serverPort.port;
+            this.credentials = serverPort.credentials;
+            this.boundPort = boundPort;
+        }
+
+        /// <value>The host.</value>
+        public string Host
+        {
+            get
+            {
+                return host;
+            }
+        }
+
+        /// <value>The port.</value>
+        public int Port
+        {
+            get
+            {
+                return port;
+            }
+        }
+
+        /// <value>The server credentials.</value>
+        public ServerCredentials Credentials
+        {
+            get
+            {
+                return credentials;
+            }
+        }
+
+        /// <value>
+        /// The port actually bound by the server. This is useful if you let server
+        /// pick port automatically. <see cref="PickUnused"/>
+        /// </value>
+        public int BoundPort
+        {
+            get
+            {
+                return boundPort;
+            }
+        }
+    }
+}
diff --git a/src/csharp/Grpc.Core/ServerServiceDefinition.cs b/src/csharp/Grpc.Core/ServerServiceDefinition.cs
index b180186c12..a00d156e52 100644
--- a/src/csharp/Grpc.Core/ServerServiceDefinition.cs
+++ b/src/csharp/Grpc.Core/ServerServiceDefinition.cs
@@ -33,7 +33,7 @@
 
 using System;
 using System.Collections.Generic;
-using System.Collections.Immutable;
+using System.Collections.ObjectModel;
 using Grpc.Core.Internal;
 
 namespace Grpc.Core
@@ -43,14 +43,14 @@ namespace Grpc.Core
     /// </summary>
     public class ServerServiceDefinition
     {
-        readonly ImmutableDictionary<string, IServerCallHandler> callHandlers;
+        readonly ReadOnlyDictionary<string, IServerCallHandler> callHandlers;
 
-        private ServerServiceDefinition(ImmutableDictionary<string, IServerCallHandler> callHandlers)
+        private ServerServiceDefinition(Dictionary<string, IServerCallHandler> callHandlers)
         {
-            this.callHandlers = callHandlers;
+            this.callHandlers = new ReadOnlyDictionary<string, IServerCallHandler>(callHandlers);
         }
 
-        internal ImmutableDictionary<string, IServerCallHandler> CallHandlers
+        internal IDictionary<string, IServerCallHandler> CallHandlers
         {
             get
             {
@@ -115,7 +115,7 @@ namespace Grpc.Core
 
             public ServerServiceDefinition Build()
             {
-                return new ServerServiceDefinition(callHandlers.ToImmutableDictionary());
+                return new ServerServiceDefinition(callHandlers);
             }
         }
     }
diff --git a/src/csharp/Grpc.Core/Utils/BenchmarkUtil.cs b/src/csharp/Grpc.Core/Utils/BenchmarkUtil.cs
index 4180d98938..82653c3a1f 100644
--- a/src/csharp/Grpc.Core/Utils/BenchmarkUtil.cs
+++ b/src/csharp/Grpc.Core/Utils/BenchmarkUtil.cs
@@ -46,13 +46,15 @@ namespace Grpc.Core.Utils
         /// </summary>
         public static void RunBenchmark(int warmupIterations, int benchmarkIterations, Action action)
         {
-            Console.WriteLine("Warmup iterations: " + warmupIterations);
+            var logger = GrpcEnvironment.Logger;
+            
+            logger.Info("Warmup iterations: {0}", warmupIterations);
             for (int i = 0; i < warmupIterations; i++)
             {
                 action();
             }
 
-            Console.WriteLine("Benchmark iterations: " + benchmarkIterations);
+            logger.Info("Benchmark iterations: {0}", benchmarkIterations);
             var stopwatch = new Stopwatch();
             stopwatch.Start();
             for (int i = 0; i < benchmarkIterations; i++)
@@ -60,8 +62,8 @@ namespace Grpc.Core.Utils
                 action();
             }
             stopwatch.Stop();
-            Console.WriteLine("Elapsed time: " + stopwatch.ElapsedMilliseconds + "ms");
-            Console.WriteLine("Ops per second: " + (int)((double)benchmarkIterations  * 1000 / stopwatch.ElapsedMilliseconds));
+            logger.Info("Elapsed time: {0}ms", stopwatch.ElapsedMilliseconds);
+            logger.Info("Ops per second: {0}", (int)((double)benchmarkIterations  * 1000 / stopwatch.ElapsedMilliseconds));
         }
     }
 }
diff --git a/src/csharp/Grpc.Core/packages.config b/src/csharp/Grpc.Core/packages.config
index 6cdcdf2656..9b12b9b096 100644
--- a/src/csharp/Grpc.Core/packages.config
+++ b/src/csharp/Grpc.Core/packages.config
@@ -3,5 +3,4 @@
   <package id="grpc.dependencies.openssl.redist" version="1.0.2.2" targetFramework="net45" />
   <package id="grpc.dependencies.zlib.redist" version="1.2.8.9" targetFramework="net45" />
   <package id="Ix-Async" version="1.2.3" targetFramework="net45" />
-  <package id="System.Collections.Immutable" version="1.1.36" targetFramework="net45" />
 </packages>
\ No newline at end of file
diff --git a/src/csharp/Grpc.Examples.MathClient/Grpc.Examples.MathClient.csproj b/src/csharp/Grpc.Examples.MathClient/Grpc.Examples.MathClient.csproj
index 5d5401593d..b603e3af3c 100644
--- a/src/csharp/Grpc.Examples.MathClient/Grpc.Examples.MathClient.csproj
+++ b/src/csharp/Grpc.Examples.MathClient/Grpc.Examples.MathClient.csproj
@@ -2,7 +2,7 @@
 <Project DefaultTargets="Build" ToolsVersion="4.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
   <PropertyGroup>
     <Configuration Condition=" '$(Configuration)' == '' ">Debug</Configuration>
-    <Platform Condition=" '$(Platform)' == '' ">x86</Platform>
+    <Platform Condition=" '$(Platform)' == '' ">AnyCPU</Platform>
     <ProductVersion>10.0.0</ProductVersion>
     <SchemaVersion>2.0</SchemaVersion>
     <ProjectGuid>{61ECB8EE-0C96-4F8E-B187-8E4D227417C0}</ProjectGuid>
@@ -11,7 +11,7 @@
     <AssemblyName>MathClient</AssemblyName>
     <TargetFrameworkVersion>v4.5</TargetFrameworkVersion>
   </PropertyGroup>
-  <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Debug|x86' ">
+  <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Debug|AnyCPU' ">
     <DebugSymbols>true</DebugSymbols>
     <DebugType>full</DebugType>
     <Optimize>false</Optimize>
@@ -19,17 +19,22 @@
     <DefineConstants>DEBUG;</DefineConstants>
     <ErrorReport>prompt</ErrorReport>
     <WarningLevel>4</WarningLevel>
-    <Externalconsole>true</Externalconsole>
-    <PlatformTarget>x86</PlatformTarget>
   </PropertyGroup>
-  <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Release|x86' ">
-    <DebugType>full</DebugType>
+  <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Release|AnyCPU' ">
+    <DebugType>pdbonly</DebugType>
     <Optimize>true</Optimize>
     <OutputPath>bin\Release</OutputPath>
     <ErrorReport>prompt</ErrorReport>
     <WarningLevel>4</WarningLevel>
-    <Externalconsole>true</Externalconsole>
-    <PlatformTarget>x86</PlatformTarget>
+  </PropertyGroup>
+  <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'ReleaseSigned|AnyCPU' ">
+    <DebugType>pdbonly</DebugType>
+    <Optimize>true</Optimize>
+    <OutputPath>bin\ReleaseSigned</OutputPath>
+    <ErrorReport>prompt</ErrorReport>
+    <WarningLevel>4</WarningLevel>
+    <SignAssembly>True</SignAssembly>
+    <AssemblyOriginatorKeyFile>C:\keys\Grpc.snk</AssemblyOriginatorKeyFile>
   </PropertyGroup>
   <ItemGroup>
     <Reference Include="System" />
diff --git a/src/csharp/Grpc.Examples.MathClient/MathClient.cs b/src/csharp/Grpc.Examples.MathClient/MathClient.cs
index cfe2a06916..f9839d99f1 100644
--- a/src/csharp/Grpc.Examples.MathClient/MathClient.cs
+++ b/src/csharp/Grpc.Examples.MathClient/MathClient.cs
@@ -39,7 +39,7 @@ namespace math
     {
         public static void Main(string[] args)
         {
-            using (Channel channel = new Channel("127.0.0.1", 23456))
+            using (Channel channel = new Channel("127.0.0.1", 23456, Credentials.Insecure))
             {
                 Math.IMathClient client = new Math.MathClient(channel);
                 MathExamples.DivExample(client);
diff --git a/src/csharp/Grpc.Examples.MathServer/Grpc.Examples.MathServer.csproj b/src/csharp/Grpc.Examples.MathServer/Grpc.Examples.MathServer.csproj
index 677d87da20..5f74b58773 100644
--- a/src/csharp/Grpc.Examples.MathServer/Grpc.Examples.MathServer.csproj
+++ b/src/csharp/Grpc.Examples.MathServer/Grpc.Examples.MathServer.csproj
@@ -2,7 +2,7 @@
 <Project DefaultTargets="Build" ToolsVersion="4.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
   <PropertyGroup>
     <Configuration Condition=" '$(Configuration)' == '' ">Debug</Configuration>
-    <Platform Condition=" '$(Platform)' == '' ">x86</Platform>
+    <Platform Condition=" '$(Platform)' == '' ">AnyCPU</Platform>
     <ProductVersion>10.0.0</ProductVersion>
     <SchemaVersion>2.0</SchemaVersion>
     <ProjectGuid>{BF62FE08-373A-43D6-9D73-41CAA38B7011}</ProjectGuid>
@@ -11,7 +11,7 @@
     <AssemblyName>MathServer</AssemblyName>
     <TargetFrameworkVersion>v4.5</TargetFrameworkVersion>
   </PropertyGroup>
-  <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Debug|x86' ">
+  <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Debug|AnyCPU' ">
     <DebugSymbols>true</DebugSymbols>
     <DebugType>full</DebugType>
     <Optimize>false</Optimize>
@@ -19,17 +19,22 @@
     <DefineConstants>DEBUG;</DefineConstants>
     <ErrorReport>prompt</ErrorReport>
     <WarningLevel>4</WarningLevel>
-    <Externalconsole>true</Externalconsole>
-    <PlatformTarget>x86</PlatformTarget>
   </PropertyGroup>
-  <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Release|x86' ">
-    <DebugType>full</DebugType>
+  <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Release|AnyCPU' ">
+    <DebugType>pdbonly</DebugType>
     <Optimize>true</Optimize>
     <OutputPath>bin\Release</OutputPath>
     <ErrorReport>prompt</ErrorReport>
     <WarningLevel>4</WarningLevel>
-    <Externalconsole>true</Externalconsole>
-    <PlatformTarget>x86</PlatformTarget>
+  </PropertyGroup>
+  <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'ReleaseSigned|AnyCPU' ">
+    <DebugType>pdbonly</DebugType>
+    <Optimize>true</Optimize>
+    <OutputPath>bin\ReleaseSigned</OutputPath>
+    <ErrorReport>prompt</ErrorReport>
+    <WarningLevel>4</WarningLevel>
+    <SignAssembly>True</SignAssembly>
+    <AssemblyOriginatorKeyFile>C:\keys\Grpc.snk</AssemblyOriginatorKeyFile>
   </PropertyGroup>
   <ItemGroup>
     <Reference Include="System" />
diff --git a/src/csharp/Grpc.Examples.MathServer/MathServer.cs b/src/csharp/Grpc.Examples.MathServer/MathServer.cs
index f440985112..5f7e717b0c 100644
--- a/src/csharp/Grpc.Examples.MathServer/MathServer.cs
+++ b/src/csharp/Grpc.Examples.MathServer/MathServer.cs
@@ -38,16 +38,19 @@ namespace math
 {
     class MainClass
     {
+        const string Host = "0.0.0.0";
+        const int Port = 23456;
+
         public static void Main(string[] args)
         {
-            string host = "0.0.0.0";
-
-            Server server = new Server();
-            server.AddServiceDefinition(Math.BindService(new MathServiceImpl()));
-            int port = server.AddListeningPort(host, 23456);
+            Server server = new Server
+            {
+                Services = { Math.BindService(new MathServiceImpl()) },
+                Ports = { { Host, Port, ServerCredentials.Insecure } }
+            };
             server.Start();
 
-            Console.WriteLine("MathServer listening on port " + port);
+            Console.WriteLine("MathServer listening on port " + Port);
 
             Console.WriteLine("Press any key to stop the server...");
             Console.ReadKey();
diff --git a/src/csharp/Grpc.Examples.Tests/Grpc.Examples.Tests.csproj b/src/csharp/Grpc.Examples.Tests/Grpc.Examples.Tests.csproj
index d59d7515d1..9a8f780b24 100644
--- a/src/csharp/Grpc.Examples.Tests/Grpc.Examples.Tests.csproj
+++ b/src/csharp/Grpc.Examples.Tests/Grpc.Examples.Tests.csproj
@@ -19,15 +19,22 @@
     <DefineConstants>DEBUG;</DefineConstants>
     <ErrorReport>prompt</ErrorReport>
     <WarningLevel>4</WarningLevel>
-    <ConsolePause>false</ConsolePause>
   </PropertyGroup>
   <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Release|AnyCPU' ">
-    <DebugType>full</DebugType>
+    <DebugType>pdbonly</DebugType>
     <Optimize>true</Optimize>
     <OutputPath>bin\Release</OutputPath>
     <ErrorReport>prompt</ErrorReport>
     <WarningLevel>4</WarningLevel>
-    <ConsolePause>false</ConsolePause>
+  </PropertyGroup>
+  <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'ReleaseSigned|AnyCPU' ">
+    <DebugType>pdbonly</DebugType>
+    <Optimize>true</Optimize>
+    <OutputPath>bin\ReleaseSigned</OutputPath>
+    <ErrorReport>prompt</ErrorReport>
+    <WarningLevel>4</WarningLevel>
+    <SignAssembly>True</SignAssembly>
+    <AssemblyOriginatorKeyFile>C:\keys\Grpc.snk</AssemblyOriginatorKeyFile>
   </PropertyGroup>
   <ItemGroup>
     <Reference Include="nunit.framework">
diff --git a/src/csharp/Grpc.Examples.Tests/MathClientServerTests.cs b/src/csharp/Grpc.Examples.Tests/MathClientServerTests.cs
index 7a957c5b6f..08aece7ef2 100644
--- a/src/csharp/Grpc.Examples.Tests/MathClientServerTests.cs
+++ b/src/csharp/Grpc.Examples.Tests/MathClientServerTests.cs
@@ -33,6 +33,7 @@
 
 using System;
 using System.Collections.Generic;
+using System.Linq;
 using System.Threading;
 using System.Threading.Tasks;
 using Grpc.Core;
@@ -46,7 +47,7 @@ namespace math.Tests
     /// </summary>
     public class MathClientServerTest
     {
-        string host = "localhost";
+        const string Host = "localhost";
         Server server;
         Channel channel;
         Math.MathClient client;
@@ -54,19 +55,14 @@ namespace math.Tests
         [TestFixtureSetUp]
         public void Init()
         {
-            server = new Server();
-            server.AddServiceDefinition(Math.BindService(new MathServiceImpl()));
-            int port = server.AddListeningPort(host, Server.PickUnusedPort);
-            server.Start();
-            channel = new Channel(host, port);
-            client = Math.NewClient(channel);
-
-            // TODO(jtattermusch): get rid of the custom header here once we have dedicated tests
-            // for header support.
-            client.HeaderInterceptor = (metadata) =>
+            server = new Server
             {
-                metadata.Add(new Metadata.Entry("customHeader", "abcdef"));
+                Services = { Math.BindService(new MathServiceImpl()) },
+                Ports = { { Host, ServerPort.PickUnused, ServerCredentials.Insecure } }
             };
+            server.Start();
+            channel = new Channel(Host, server.Ports.Single().BoundPort, Credentials.Insecure);
+            client = Math.NewClient(channel);
         }
 
         [TestFixtureTearDown]
@@ -108,69 +104,105 @@ namespace math.Tests
         }
 
         [Test]
-        public void DivAsync()
+        public async Task DivAsync()
+        {
+            DivReply response = await client.DivAsync(new DivArgs.Builder { Dividend = 10, Divisor = 3 }.Build());
+            Assert.AreEqual(3, response.Quotient);
+            Assert.AreEqual(1, response.Remainder);
+        }
+
+        [Test]
+        public async Task Fib()
         {
-            Task.Run(async () =>
+            using (var call = client.Fib(new FibArgs.Builder { Limit = 6 }.Build()))
             {
-                DivReply response = await client.DivAsync(new DivArgs.Builder { Dividend = 10, Divisor = 3 }.Build());
-                Assert.AreEqual(3, response.Quotient);
-                Assert.AreEqual(1, response.Remainder);
-            }).Wait();
+                var responses = await call.ResponseStream.ToList();
+                CollectionAssert.AreEqual(new List<long> { 1, 1, 2, 3, 5, 8 },
+                    responses.ConvertAll((n) => n.Num_));
+            }
         }
 
         [Test]
-        public void Fib()
+        public async Task FibWithCancel()
         {
-            Task.Run(async () =>
+            var cts = new CancellationTokenSource();
+
+            using (var call = client.Fib(new FibArgs.Builder { Limit = 0 }.Build(), 
+                cancellationToken: cts.Token))
             {
-                using (var call = client.Fib(new FibArgs.Builder { Limit = 6 }.Build()))
+                List<long> responses = new List<long>();
+
+                try
                 {
-                    var responses = await call.ResponseStream.ToList();
-                    CollectionAssert.AreEqual(new List<long> { 1, 1, 2, 3, 5, 8 },
-                        responses.ConvertAll((n) => n.Num_));
+                    while (await call.ResponseStream.MoveNext())
+                    {
+                        if (responses.Count == 0)
+                        {
+                            cts.CancelAfter(500);  // make sure we cancel soon
+                        }
+                        responses.Add(call.ResponseStream.Current.Num_);
+                    }
+                    Assert.Fail();
                 }
-            }).Wait();
+                catch (RpcException e)
+                {
+                    Assert.IsTrue(responses.Count > 0);
+                    Assert.AreEqual(StatusCode.Cancelled, e.Status.StatusCode);
+                }
+            }
         }
 
-        // TODO: test Fib with limit=0 and cancellation
         [Test]
-        public void Sum()
+        public async Task FibWithDeadline()
         {
-            Task.Run(async () =>
+            using (var call = client.Fib(new FibArgs.Builder { Limit = 0 }.Build(), 
+                deadline: DateTime.UtcNow.AddMilliseconds(500)))
             {
-                using (var call = client.Sum())
+                try
                 {
-                    var numbers = new List<long> { 10, 20, 30 }.ConvertAll(
-                             n => Num.CreateBuilder().SetNum_(n).Build());
-
-                    await call.RequestStream.WriteAll(numbers);
-                    var result = await call.ResponseAsync;
-                    Assert.AreEqual(60, result.Num_);
+                    await call.ResponseStream.ToList();
+                    Assert.Fail();
+                }
+                catch (RpcException e)
+                {
+                    Assert.AreEqual(StatusCode.DeadlineExceeded, e.Status.StatusCode);
                 }
-            }).Wait();
+            }
         }
 
+        // TODO: test Fib with limit=0 and cancellation
         [Test]
-        public void DivMany()
+        public async Task Sum()
         {
-            Task.Run(async () =>
+            using (var call = client.Sum())
             {
-                var divArgsList = new List<DivArgs>
-                {
-                    new DivArgs.Builder { Dividend = 10, Divisor = 3 }.Build(),
-                    new DivArgs.Builder { Dividend = 100, Divisor = 21 }.Build(),
-                    new DivArgs.Builder { Dividend = 7, Divisor = 2 }.Build()
-                };
+                var numbers = new List<long> { 10, 20, 30 }.ConvertAll(
+                            n => Num.CreateBuilder().SetNum_(n).Build());
 
-                using (var call = client.DivMany())
-                {
-                    await call.RequestStream.WriteAll(divArgsList);
-                    var result = await call.ResponseStream.ToList();
+                await call.RequestStream.WriteAll(numbers);
+                var result = await call.ResponseAsync;
+                Assert.AreEqual(60, result.Num_);
+            }
+        }
 
-                    CollectionAssert.AreEqual(new long[] { 3, 4, 3 }, result.ConvertAll((divReply) => divReply.Quotient));
-                    CollectionAssert.AreEqual(new long[] { 1, 16, 1 }, result.ConvertAll((divReply) => divReply.Remainder));
-                }
-            }).Wait();
+        [Test]
+        public async Task DivMany()
+        {
+            var divArgsList = new List<DivArgs>
+            {
+                new DivArgs.Builder { Dividend = 10, Divisor = 3 }.Build(),
+                new DivArgs.Builder { Dividend = 100, Divisor = 21 }.Build(),
+                new DivArgs.Builder { Dividend = 7, Divisor = 2 }.Build()
+            };
+
+            using (var call = client.DivMany())
+            {
+                await call.RequestStream.WriteAll(divArgsList);
+                var result = await call.ResponseStream.ToList();
+
+                CollectionAssert.AreEqual(new long[] { 3, 4, 3 }, result.ConvertAll((divReply) => divReply.Quotient));
+                CollectionAssert.AreEqual(new long[] { 1, 16, 1 }, result.ConvertAll((divReply) => divReply.Remainder));
+            }
         }
     }
 }
diff --git a/src/csharp/Grpc.Examples/Grpc.Examples.csproj b/src/csharp/Grpc.Examples/Grpc.Examples.csproj
index eaf24a253c..c1aa40500e 100644
--- a/src/csharp/Grpc.Examples/Grpc.Examples.csproj
+++ b/src/csharp/Grpc.Examples/Grpc.Examples.csproj
@@ -19,15 +19,22 @@
     <DefineConstants>DEBUG;</DefineConstants>
     <ErrorReport>prompt</ErrorReport>
     <WarningLevel>4</WarningLevel>
-    <ConsolePause>false</ConsolePause>
   </PropertyGroup>
   <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Release|AnyCPU' ">
-    <DebugType>full</DebugType>
+    <DebugType>pdbonly</DebugType>
     <Optimize>true</Optimize>
     <OutputPath>bin\Release</OutputPath>
     <ErrorReport>prompt</ErrorReport>
     <WarningLevel>4</WarningLevel>
-    <ConsolePause>false</ConsolePause>
+  </PropertyGroup>
+  <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'ReleaseSigned|AnyCPU' ">
+    <DebugType>pdbonly</DebugType>
+    <Optimize>true</Optimize>
+    <OutputPath>bin\ReleaseSigned</OutputPath>
+    <ErrorReport>prompt</ErrorReport>
+    <WarningLevel>4</WarningLevel>
+    <SignAssembly>True</SignAssembly>
+    <AssemblyOriginatorKeyFile>C:\keys\Grpc.snk</AssemblyOriginatorKeyFile>
   </PropertyGroup>
   <ItemGroup>
     <Reference Include="System" />
diff --git a/src/csharp/Grpc.Examples/MathGrpc.cs b/src/csharp/Grpc.Examples/MathGrpc.cs
index ef787cf1d8..4941ff35f7 100644
--- a/src/csharp/Grpc.Examples/MathGrpc.cs
+++ b/src/csharp/Grpc.Examples/MathGrpc.cs
@@ -19,24 +19,28 @@ namespace math {
 
     static readonly Method<global::math.DivArgs, global::math.DivReply> __Method_Div = new Method<global::math.DivArgs, global::math.DivReply>(
         MethodType.Unary,
+        __ServiceName,
         "Div",
         __Marshaller_DivArgs,
         __Marshaller_DivReply);
 
     static readonly Method<global::math.DivArgs, global::math.DivReply> __Method_DivMany = new Method<global::math.DivArgs, global::math.DivReply>(
         MethodType.DuplexStreaming,
+        __ServiceName,
         "DivMany",
         __Marshaller_DivArgs,
         __Marshaller_DivReply);
 
     static readonly Method<global::math.FibArgs, global::math.Num> __Method_Fib = new Method<global::math.FibArgs, global::math.Num>(
         MethodType.ServerStreaming,
+        __ServiceName,
         "Fib",
         __Marshaller_FibArgs,
         __Marshaller_Num);
 
     static readonly Method<global::math.Num, global::math.Num> __Method_Sum = new Method<global::math.Num, global::math.Num>(
         MethodType.ClientStreaming,
+        __ServiceName,
         "Sum",
         __Marshaller_Num,
         __Marshaller_Num);
@@ -44,11 +48,16 @@ namespace math {
     // client interface
     public interface IMathClient
     {
-      global::math.DivReply Div(global::math.DivArgs request, Metadata headers = null, CancellationToken cancellationToken = default(CancellationToken));
-      AsyncUnaryCall<global::math.DivReply> DivAsync(global::math.DivArgs request, Metadata headers = null, CancellationToken cancellationToken = default(CancellationToken));
-      AsyncDuplexStreamingCall<global::math.DivArgs, global::math.DivReply> DivMany(Metadata headers = null, CancellationToken cancellationToken = default(CancellationToken));
-      AsyncServerStreamingCall<global::math.Num> Fib(global::math.FibArgs request, Metadata headers = null, CancellationToken cancellationToken = default(CancellationToken));
-      AsyncClientStreamingCall<global::math.Num, global::math.Num> Sum(Metadata headers = null, CancellationToken cancellationToken = default(CancellationToken));
+      global::math.DivReply Div(global::math.DivArgs request, Metadata headers = null, DateTime? deadline = null, CancellationToken cancellationToken = default(CancellationToken));
+      global::math.DivReply Div(global::math.DivArgs request, CallOptions options);
+      AsyncUnaryCall<global::math.DivReply> DivAsync(global::math.DivArgs request, Metadata headers = null, DateTime? deadline = null, CancellationToken cancellationToken = default(CancellationToken));
+      AsyncUnaryCall<global::math.DivReply> DivAsync(global::math.DivArgs request, CallOptions options);
+      AsyncDuplexStreamingCall<global::math.DivArgs, global::math.DivReply> DivMany(Metadata headers = null, DateTime? deadline = null, CancellationToken cancellationToken = default(CancellationToken));
+      AsyncDuplexStreamingCall<global::math.DivArgs, global::math.DivReply> DivMany(CallOptions options);
+      AsyncServerStreamingCall<global::math.Num> Fib(global::math.FibArgs request, Metadata headers = null, DateTime? deadline = null, CancellationToken cancellationToken = default(CancellationToken));
+      AsyncServerStreamingCall<global::math.Num> Fib(global::math.FibArgs request, CallOptions options);
+      AsyncClientStreamingCall<global::math.Num, global::math.Num> Sum(Metadata headers = null, DateTime? deadline = null, CancellationToken cancellationToken = default(CancellationToken));
+      AsyncClientStreamingCall<global::math.Num, global::math.Num> Sum(CallOptions options);
     }
 
     // server-side interface
@@ -66,30 +75,55 @@ namespace math {
       public MathClient(Channel channel) : base(channel)
       {
       }
-      public global::math.DivReply Div(global::math.DivArgs request, Metadata headers = null, CancellationToken cancellationToken = default(CancellationToken))
+      public global::math.DivReply Div(global::math.DivArgs request, Metadata headers = null, DateTime? deadline = null, CancellationToken cancellationToken = default(CancellationToken))
       {
-        var call = CreateCall(__ServiceName, __Method_Div, headers);
-        return Calls.BlockingUnaryCall(call, request, cancellationToken);
+        var call = CreateCall(__Method_Div, new CallOptions(headers, deadline, cancellationToken));
+        return Calls.BlockingUnaryCall(call, request);
       }
-      public AsyncUnaryCall<global::math.DivReply> DivAsync(global::math.DivArgs request, Metadata headers = null, CancellationToken cancellationToken = default(CancellationToken))
+      public global::math.DivReply Div(global::math.DivArgs request, CallOptions options)
       {
-        var call = CreateCall(__ServiceName, __Method_Div, headers);
-        return Calls.AsyncUnaryCall(call, request, cancellationToken);
+        var call = CreateCall(__Method_Div, options);
+        return Calls.BlockingUnaryCall(call, request);
       }
-      public AsyncDuplexStreamingCall<global::math.DivArgs, global::math.DivReply> DivMany(Metadata headers = null, CancellationToken cancellationToken = default(CancellationToken))
+      public AsyncUnaryCall<global::math.DivReply> DivAsync(global::math.DivArgs request, Metadata headers = null, DateTime? deadline = null, CancellationToken cancellationToken = default(CancellationToken))
       {
-        var call = CreateCall(__ServiceName, __Method_DivMany, headers);
-        return Calls.AsyncDuplexStreamingCall(call, cancellationToken);
+        var call = CreateCall(__Method_Div, new CallOptions(headers, deadline, cancellationToken));
+        return Calls.AsyncUnaryCall(call, request);
       }
-      public AsyncServerStreamingCall<global::math.Num> Fib(global::math.FibArgs request, Metadata headers = null, CancellationToken cancellationToken = default(CancellationToken))
+      public AsyncUnaryCall<global::math.DivReply> DivAsync(global::math.DivArgs request, CallOptions options)
       {
-        var call = CreateCall(__ServiceName, __Method_Fib, headers);
-        return Calls.AsyncServerStreamingCall(call, request, cancellationToken);
+        var call = CreateCall(__Method_Div, options);
+        return Calls.AsyncUnaryCall(call, request);
       }
-      public AsyncClientStreamingCall<global::math.Num, global::math.Num> Sum(Metadata headers = null, CancellationToken cancellationToken = default(CancellationToken))
+      public AsyncDuplexStreamingCall<global::math.DivArgs, global::math.DivReply> DivMany(Metadata headers = null, DateTime? deadline = null, CancellationToken cancellationToken = default(CancellationToken))
       {
-        var call = CreateCall(__ServiceName, __Method_Sum, headers);
-        return Calls.AsyncClientStreamingCall(call, cancellationToken);
+        var call = CreateCall(__Method_DivMany, new CallOptions(headers, deadline, cancellationToken));
+        return Calls.AsyncDuplexStreamingCall(call);
+      }
+      public AsyncDuplexStreamingCall<global::math.DivArgs, global::math.DivReply> DivMany(CallOptions options)
+      {
+        var call = CreateCall(__Method_DivMany, options);
+        return Calls.AsyncDuplexStreamingCall(call);
+      }
+      public AsyncServerStreamingCall<global::math.Num> Fib(global::math.FibArgs request, Metadata headers = null, DateTime? deadline = null, CancellationToken cancellationToken = default(CancellationToken))
+      {
+        var call = CreateCall(__Method_Fib, new CallOptions(headers, deadline, cancellationToken));
+        return Calls.AsyncServerStreamingCall(call, request);
+      }
+      public AsyncServerStreamingCall<global::math.Num> Fib(global::math.FibArgs request, CallOptions options)
+      {
+        var call = CreateCall(__Method_Fib, options);
+        return Calls.AsyncServerStreamingCall(call, request);
+      }
+      public AsyncClientStreamingCall<global::math.Num, global::math.Num> Sum(Metadata headers = null, DateTime? deadline = null, CancellationToken cancellationToken = default(CancellationToken))
+      {
+        var call = CreateCall(__Method_Sum, new CallOptions(headers, deadline, cancellationToken));
+        return Calls.AsyncClientStreamingCall(call);
+      }
+      public AsyncClientStreamingCall<global::math.Num, global::math.Num> Sum(CallOptions options)
+      {
+        var call = CreateCall(__Method_Sum, options);
+        return Calls.AsyncClientStreamingCall(call);
       }
     }
 
diff --git a/src/csharp/Grpc.Examples/MathServiceImpl.cs b/src/csharp/Grpc.Examples/MathServiceImpl.cs
index 3dd0f53a0d..dd26b1d350 100644
--- a/src/csharp/Grpc.Examples/MathServiceImpl.cs
+++ b/src/csharp/Grpc.Examples/MathServiceImpl.cs
@@ -54,8 +54,13 @@ namespace math
         {
             if (request.Limit <= 0)
             {
-                // TODO(jtattermusch): support cancellation
-                throw new NotImplementedException("Not implemented yet");
+                // keep streaming the sequence until cancelled.
+                IEnumerator<Num> fibEnumerator = FibInternal(long.MaxValue).GetEnumerator();
+                while (!context.CancellationToken.IsCancellationRequested && fibEnumerator.MoveNext())
+                {
+                    await responseStream.WriteAsync(fibEnumerator.Current);
+                    await Task.Delay(100);
+                }
             }
 
             if (request.Limit > 0)
diff --git a/src/csharp/Grpc.HealthCheck.Tests/Grpc.HealthCheck.Tests.csproj b/src/csharp/Grpc.HealthCheck.Tests/Grpc.HealthCheck.Tests.csproj
index 72e110302b..c922ddfb9e 100644
--- a/src/csharp/Grpc.HealthCheck.Tests/Grpc.HealthCheck.Tests.csproj
+++ b/src/csharp/Grpc.HealthCheck.Tests/Grpc.HealthCheck.Tests.csproj
@@ -17,7 +17,6 @@
     <DebugType>full</DebugType>
     <Optimize>false</Optimize>
     <OutputPath>bin\Debug\</OutputPath>
-    <DefineConstants>DEBUG;TRACE</DefineConstants>
     <ErrorReport>prompt</ErrorReport>
     <WarningLevel>4</WarningLevel>
   </PropertyGroup>
@@ -25,10 +24,18 @@
     <DebugType>pdbonly</DebugType>
     <Optimize>true</Optimize>
     <OutputPath>bin\Release\</OutputPath>
-    <DefineConstants>TRACE</DefineConstants>
     <ErrorReport>prompt</ErrorReport>
     <WarningLevel>4</WarningLevel>
   </PropertyGroup>
+  <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'ReleaseSigned|AnyCPU' ">
+    <DebugType>pdbonly</DebugType>
+    <Optimize>true</Optimize>
+    <OutputPath>bin\ReleaseSigned</OutputPath>
+    <ErrorReport>prompt</ErrorReport>
+    <WarningLevel>4</WarningLevel>
+    <SignAssembly>True</SignAssembly>
+    <AssemblyOriginatorKeyFile>C:\keys\Grpc.snk</AssemblyOriginatorKeyFile>
+  </PropertyGroup>
   <ItemGroup>
     <Reference Include="Google.ProtocolBuffers">
       <HintPath>..\packages\Google.ProtocolBuffers.2.4.1.555\lib\net40\Google.ProtocolBuffers.dll</HintPath>
diff --git a/src/csharp/Grpc.HealthCheck.Tests/HealthClientServerTest.cs b/src/csharp/Grpc.HealthCheck.Tests/HealthClientServerTest.cs
index bc14a0a62f..024377e216 100644
--- a/src/csharp/Grpc.HealthCheck.Tests/HealthClientServerTest.cs
+++ b/src/csharp/Grpc.HealthCheck.Tests/HealthClientServerTest.cs
@@ -57,11 +57,13 @@ namespace Grpc.HealthCheck.Tests
         {
             serviceImpl = new HealthServiceImpl();
 
-            server = new Server();
-            server.AddServiceDefinition(Grpc.Health.V1Alpha.Health.BindService(serviceImpl));
-            int port = server.AddListeningPort(Host, Server.PickUnusedPort);
+            server = new Server
+            {
+                Services = { Grpc.Health.V1Alpha.Health.BindService(serviceImpl) },
+                Ports = { { Host, ServerPort.PickUnused, ServerCredentials.Insecure } }
+            };
             server.Start();
-            channel = new Channel(Host, port);
+            channel = new Channel(Host, server.Ports.Single().BoundPort, Credentials.Insecure);
 
             client = Grpc.Health.V1Alpha.Health.NewClient(channel);
         }
diff --git a/src/csharp/Grpc.HealthCheck/Grpc.HealthCheck.csproj b/src/csharp/Grpc.HealthCheck/Grpc.HealthCheck.csproj
index 4ebb6446dd..0b7a7b91c6 100644
--- a/src/csharp/Grpc.HealthCheck/Grpc.HealthCheck.csproj
+++ b/src/csharp/Grpc.HealthCheck/Grpc.HealthCheck.csproj
@@ -18,7 +18,6 @@
     <DebugType>full</DebugType>
     <Optimize>false</Optimize>
     <OutputPath>bin\Debug\</OutputPath>
-    <DefineConstants>DEBUG;TRACE</DefineConstants>
     <ErrorReport>prompt</ErrorReport>
     <WarningLevel>4</WarningLevel>
   </PropertyGroup>
@@ -26,10 +25,18 @@
     <DebugType>pdbonly</DebugType>
     <Optimize>true</Optimize>
     <OutputPath>bin\Release\</OutputPath>
-    <DefineConstants>TRACE</DefineConstants>
     <ErrorReport>prompt</ErrorReport>
     <WarningLevel>4</WarningLevel>
   </PropertyGroup>
+  <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'ReleaseSigned|AnyCPU' ">
+    <DebugType>pdbonly</DebugType>
+    <Optimize>true</Optimize>
+    <OutputPath>bin\ReleaseSigned</OutputPath>
+    <ErrorReport>prompt</ErrorReport>
+    <WarningLevel>4</WarningLevel>
+    <SignAssembly>True</SignAssembly>
+    <AssemblyOriginatorKeyFile>C:\keys\Grpc.snk</AssemblyOriginatorKeyFile>
+  </PropertyGroup>
   <ItemGroup>
     <Reference Include="Google.ProtocolBuffers">
       <HintPath>..\packages\Google.ProtocolBuffers.2.4.1.555\lib\net40\Google.ProtocolBuffers.dll</HintPath>
diff --git a/src/csharp/Grpc.HealthCheck/Grpc.HealthCheck.nuspec b/src/csharp/Grpc.HealthCheck/Grpc.HealthCheck.nuspec
index ca35b36805..acdfba42c8 100644
--- a/src/csharp/Grpc.HealthCheck/Grpc.HealthCheck.nuspec
+++ b/src/csharp/Grpc.HealthCheck/Grpc.HealthCheck.nuspec
@@ -20,9 +20,9 @@
     </dependencies>
   </metadata>
   <files>
-    <file src="bin/Release/Grpc.HealthCheck.dll" target="lib/net45" />
-	<file src="bin/Release/Grpc.HealthCheck.pdb" target="lib/net45" />
-	<file src="bin/Release/Grpc.HealthCheck.xml" target="lib/net45" />
+    <file src="bin/ReleaseSigned/Grpc.HealthCheck.dll" target="lib/net45" />
+	<file src="bin/ReleaseSigned/Grpc.HealthCheck.pdb" target="lib/net45" />
+	<file src="bin/ReleaseSigned/Grpc.HealthCheck.xml" target="lib/net45" />
 	<file src="**\*.cs" target="src" />
   </files>
 </package>
diff --git a/src/csharp/Grpc.HealthCheck/HealthGrpc.cs b/src/csharp/Grpc.HealthCheck/HealthGrpc.cs
index 217127eca7..0dabc91f7c 100644
--- a/src/csharp/Grpc.HealthCheck/HealthGrpc.cs
+++ b/src/csharp/Grpc.HealthCheck/HealthGrpc.cs
@@ -17,6 +17,7 @@ namespace Grpc.Health.V1Alpha {
 
     static readonly Method<global::Grpc.Health.V1Alpha.HealthCheckRequest, global::Grpc.Health.V1Alpha.HealthCheckResponse> __Method_Check = new Method<global::Grpc.Health.V1Alpha.HealthCheckRequest, global::Grpc.Health.V1Alpha.HealthCheckResponse>(
         MethodType.Unary,
+        __ServiceName,
         "Check",
         __Marshaller_HealthCheckRequest,
         __Marshaller_HealthCheckResponse);
@@ -24,8 +25,10 @@ namespace Grpc.Health.V1Alpha {
     // client interface
     public interface IHealthClient
     {
-      global::Grpc.Health.V1Alpha.HealthCheckResponse Check(global::Grpc.Health.V1Alpha.HealthCheckRequest request, Metadata headers = null, CancellationToken cancellationToken = default(CancellationToken));
-      AsyncUnaryCall<global::Grpc.Health.V1Alpha.HealthCheckResponse> CheckAsync(global::Grpc.Health.V1Alpha.HealthCheckRequest request, Metadata headers = null, CancellationToken cancellationToken = default(CancellationToken));
+      global::Grpc.Health.V1Alpha.HealthCheckResponse Check(global::Grpc.Health.V1Alpha.HealthCheckRequest request, Metadata headers = null, DateTime? deadline = null, CancellationToken cancellationToken = default(CancellationToken));
+      global::Grpc.Health.V1Alpha.HealthCheckResponse Check(global::Grpc.Health.V1Alpha.HealthCheckRequest request, CallOptions options);
+      AsyncUnaryCall<global::Grpc.Health.V1Alpha.HealthCheckResponse> CheckAsync(global::Grpc.Health.V1Alpha.HealthCheckRequest request, Metadata headers = null, DateTime? deadline = null, CancellationToken cancellationToken = default(CancellationToken));
+      AsyncUnaryCall<global::Grpc.Health.V1Alpha.HealthCheckResponse> CheckAsync(global::Grpc.Health.V1Alpha.HealthCheckRequest request, CallOptions options);
     }
 
     // server-side interface
@@ -40,15 +43,25 @@ namespace Grpc.Health.V1Alpha {
       public HealthClient(Channel channel) : base(channel)
       {
       }
-      public global::Grpc.Health.V1Alpha.HealthCheckResponse Check(global::Grpc.Health.V1Alpha.HealthCheckRequest request, Metadata headers = null, CancellationToken cancellationToken = default(CancellationToken))
+      public global::Grpc.Health.V1Alpha.HealthCheckResponse Check(global::Grpc.Health.V1Alpha.HealthCheckRequest request, Metadata headers = null, DateTime? deadline = null, CancellationToken cancellationToken = default(CancellationToken))
       {
-        var call = CreateCall(__ServiceName, __Method_Check, headers);
-        return Calls.BlockingUnaryCall(call, request, cancellationToken);
+        var call = CreateCall(__Method_Check, new CallOptions(headers, deadline, cancellationToken));
+        return Calls.BlockingUnaryCall(call, request);
       }
-      public AsyncUnaryCall<global::Grpc.Health.V1Alpha.HealthCheckResponse> CheckAsync(global::Grpc.Health.V1Alpha.HealthCheckRequest request, Metadata headers = null, CancellationToken cancellationToken = default(CancellationToken))
+      public global::Grpc.Health.V1Alpha.HealthCheckResponse Check(global::Grpc.Health.V1Alpha.HealthCheckRequest request, CallOptions options)
       {
-        var call = CreateCall(__ServiceName, __Method_Check, headers);
-        return Calls.AsyncUnaryCall(call, request, cancellationToken);
+        var call = CreateCall(__Method_Check, options);
+        return Calls.BlockingUnaryCall(call, request);
+      }
+      public AsyncUnaryCall<global::Grpc.Health.V1Alpha.HealthCheckResponse> CheckAsync(global::Grpc.Health.V1Alpha.HealthCheckRequest request, Metadata headers = null, DateTime? deadline = null, CancellationToken cancellationToken = default(CancellationToken))
+      {
+        var call = CreateCall(__Method_Check, new CallOptions(headers, deadline, cancellationToken));
+        return Calls.AsyncUnaryCall(call, request);
+      }
+      public AsyncUnaryCall<global::Grpc.Health.V1Alpha.HealthCheckResponse> CheckAsync(global::Grpc.Health.V1Alpha.HealthCheckRequest request, CallOptions options)
+      {
+        var call = CreateCall(__Method_Check, options);
+        return Calls.AsyncUnaryCall(call, request);
       }
     }
 
diff --git a/src/csharp/Grpc.IntegrationTesting.Client/Grpc.IntegrationTesting.Client.csproj b/src/csharp/Grpc.IntegrationTesting.Client/Grpc.IntegrationTesting.Client.csproj
index dc1d0a44c0..2c38c9645c 100644
--- a/src/csharp/Grpc.IntegrationTesting.Client/Grpc.IntegrationTesting.Client.csproj
+++ b/src/csharp/Grpc.IntegrationTesting.Client/Grpc.IntegrationTesting.Client.csproj
@@ -2,7 +2,7 @@
 <Project DefaultTargets="Build" ToolsVersion="4.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
   <PropertyGroup>
     <Configuration Condition=" '$(Configuration)' == '' ">Debug</Configuration>
-    <Platform Condition=" '$(Platform)' == '' ">x86</Platform>
+    <Platform Condition=" '$(Platform)' == '' ">AnyCPU</Platform>
     <ProjectGuid>{3D166931-BA2D-416E-95A3-D36E8F6E90B9}</ProjectGuid>
     <OutputType>Exe</OutputType>
     <RootNamespace>Grpc.IntegrationTesting.Client</RootNamespace>
@@ -10,7 +10,7 @@
     <StartupObject>Grpc.IntegrationTesting.Client.Program</StartupObject>
     <TargetFrameworkVersion>v4.5</TargetFrameworkVersion>
   </PropertyGroup>
-  <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Debug|x86' ">
+  <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Debug|AnyCPU' ">
     <DebugSymbols>true</DebugSymbols>
     <DebugType>full</DebugType>
     <Optimize>false</Optimize>
@@ -18,17 +18,24 @@
     <DefineConstants>DEBUG;</DefineConstants>
     <ErrorReport>prompt</ErrorReport>
     <WarningLevel>4</WarningLevel>
-    <Externalconsole>true</Externalconsole>
-    <PlatformTarget>x86</PlatformTarget>
+    <PlatformTarget>AnyCPU</PlatformTarget>
   </PropertyGroup>
-  <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Release|x86' ">
-    <DebugType>full</DebugType>
+  <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Release|AnyCPU' ">
+    <DebugType>pdbonly</DebugType>
     <Optimize>true</Optimize>
     <OutputPath>bin\Release</OutputPath>
     <ErrorReport>prompt</ErrorReport>
     <WarningLevel>4</WarningLevel>
-    <Externalconsole>true</Externalconsole>
-    <PlatformTarget>x86</PlatformTarget>
+    <PlatformTarget>AnyCPU</PlatformTarget>
+  </PropertyGroup>
+  <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'ReleaseSigned|AnyCPU' ">
+    <DebugType>pdbonly</DebugType>
+    <Optimize>true</Optimize>
+    <OutputPath>bin\ReleaseSigned</OutputPath>
+    <ErrorReport>prompt</ErrorReport>
+    <WarningLevel>4</WarningLevel>
+    <SignAssembly>True</SignAssembly>
+    <AssemblyOriginatorKeyFile>C:\keys\Grpc.snk</AssemblyOriginatorKeyFile>
   </PropertyGroup>
   <ItemGroup>
     <Reference Include="System" />
diff --git a/src/csharp/Grpc.IntegrationTesting.Client/app.config b/src/csharp/Grpc.IntegrationTesting.Client/app.config
index 966b777192..0a82bb4f16 100644
--- a/src/csharp/Grpc.IntegrationTesting.Client/app.config
+++ b/src/csharp/Grpc.IntegrationTesting.Client/app.config
@@ -4,7 +4,7 @@
     <assemblyBinding xmlns="urn:schemas-microsoft-com:asm.v1">
       <dependentAssembly>
         <assemblyIdentity name="System.Net.Http.Primitives" publicKeyToken="b03f5f7f11d50a3a" culture="neutral" />
-        <bindingRedirect oldVersion="0.0.0.0-4.2.28.0" newVersion="4.2.28.0" />
+        <bindingRedirect oldVersion="0.0.0.0-4.2.29.0" newVersion="4.2.29.0" />
       </dependentAssembly>
       <dependentAssembly>
         <assemblyIdentity name="System.Net.Http" publicKeyToken="b03f5f7f11d50a3a" culture="neutral" />
diff --git a/src/csharp/Grpc.IntegrationTesting.Server/Grpc.IntegrationTesting.Server.csproj b/src/csharp/Grpc.IntegrationTesting.Server/Grpc.IntegrationTesting.Server.csproj
index f03c8f3ce3..949ad61375 100644
--- a/src/csharp/Grpc.IntegrationTesting.Server/Grpc.IntegrationTesting.Server.csproj
+++ b/src/csharp/Grpc.IntegrationTesting.Server/Grpc.IntegrationTesting.Server.csproj
@@ -2,7 +2,7 @@
 <Project DefaultTargets="Build" ToolsVersion="4.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
   <PropertyGroup>
     <Configuration Condition=" '$(Configuration)' == '' ">Debug</Configuration>
-    <Platform Condition=" '$(Platform)' == '' ">x86</Platform>
+    <Platform Condition=" '$(Platform)' == '' ">AnyCPU</Platform>
     <ProjectGuid>{A654F3B8-E859-4E6A-B30D-227527DBEF0D}</ProjectGuid>
     <OutputType>Exe</OutputType>
     <RootNamespace>Grpc.IntegrationTesting.Server</RootNamespace>
@@ -10,7 +10,7 @@
     <StartupObject>Grpc.IntegrationTesting.Server.Program</StartupObject>
     <TargetFrameworkVersion>v4.5</TargetFrameworkVersion>
   </PropertyGroup>
-  <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Debug|x86' ">
+  <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Debug|AnyCPU' ">
     <DebugSymbols>true</DebugSymbols>
     <DebugType>full</DebugType>
     <Optimize>false</Optimize>
@@ -18,17 +18,24 @@
     <DefineConstants>DEBUG;</DefineConstants>
     <ErrorReport>prompt</ErrorReport>
     <WarningLevel>4</WarningLevel>
-    <Externalconsole>true</Externalconsole>
-    <PlatformTarget>x86</PlatformTarget>
+    <PlatformTarget>AnyCPU</PlatformTarget>
   </PropertyGroup>
-  <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Release|x86' ">
-    <DebugType>full</DebugType>
+  <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Release|AnyCPU' ">
+    <DebugType>pdbonly</DebugType>
     <Optimize>true</Optimize>
     <OutputPath>bin\Release</OutputPath>
     <ErrorReport>prompt</ErrorReport>
     <WarningLevel>4</WarningLevel>
-    <Externalconsole>true</Externalconsole>
-    <PlatformTarget>x86</PlatformTarget>
+    <PlatformTarget>AnyCPU</PlatformTarget>
+  </PropertyGroup>
+  <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'ReleaseSigned|AnyCPU' ">
+    <DebugType>pdbonly</DebugType>
+    <Optimize>true</Optimize>
+    <OutputPath>bin\ReleaseSigned</OutputPath>
+    <ErrorReport>prompt</ErrorReport>
+    <WarningLevel>4</WarningLevel>
+    <SignAssembly>True</SignAssembly>
+    <AssemblyOriginatorKeyFile>C:\keys\Grpc.snk</AssemblyOriginatorKeyFile>
   </PropertyGroup>
   <ItemGroup>
     <Reference Include="System" />
diff --git a/src/csharp/Grpc.IntegrationTesting.Server/app.config b/src/csharp/Grpc.IntegrationTesting.Server/app.config
index 966b777192..0a82bb4f16 100644
--- a/src/csharp/Grpc.IntegrationTesting.Server/app.config
+++ b/src/csharp/Grpc.IntegrationTesting.Server/app.config
@@ -4,7 +4,7 @@
     <assemblyBinding xmlns="urn:schemas-microsoft-com:asm.v1">
       <dependentAssembly>
         <assemblyIdentity name="System.Net.Http.Primitives" publicKeyToken="b03f5f7f11d50a3a" culture="neutral" />
-        <bindingRedirect oldVersion="0.0.0.0-4.2.28.0" newVersion="4.2.28.0" />
+        <bindingRedirect oldVersion="0.0.0.0-4.2.29.0" newVersion="4.2.29.0" />
       </dependentAssembly>
       <dependentAssembly>
         <assemblyIdentity name="System.Net.Http" publicKeyToken="b03f5f7f11d50a3a" culture="neutral" />
diff --git a/src/csharp/Grpc.IntegrationTesting/Grpc.IntegrationTesting.csproj b/src/csharp/Grpc.IntegrationTesting/Grpc.IntegrationTesting.csproj
index d3c69ab9eb..06a75a3351 100644
--- a/src/csharp/Grpc.IntegrationTesting/Grpc.IntegrationTesting.csproj
+++ b/src/csharp/Grpc.IntegrationTesting/Grpc.IntegrationTesting.csproj
@@ -2,16 +2,15 @@
 <Project DefaultTargets="Build" ToolsVersion="4.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
   <PropertyGroup>
     <Configuration Condition=" '$(Configuration)' == '' ">Debug</Configuration>
-    <Platform Condition=" '$(Platform)' == '' ">x86</Platform>
-    <ProductVersion>8.0.30703</ProductVersion>
-    <SchemaVersion>2.0</SchemaVersion>
+    <Platform Condition=" '$(Platform)' == '' ">AnyCPU</Platform>
     <ProjectGuid>{C61154BA-DD4A-4838-8420-0162A28925E0}</ProjectGuid>
     <OutputType>Library</OutputType>
     <RootNamespace>Grpc.IntegrationTesting</RootNamespace>
     <AssemblyName>Grpc.IntegrationTesting</AssemblyName>
     <TargetFrameworkVersion>v4.5</TargetFrameworkVersion>
+    <NuGetPackageImportStamp>041c163e</NuGetPackageImportStamp>
   </PropertyGroup>
-  <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Debug|x86' ">
+  <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Debug|AnyCPU' ">
     <DebugSymbols>true</DebugSymbols>
     <DebugType>full</DebugType>
     <Optimize>false</Optimize>
@@ -19,46 +18,44 @@
     <DefineConstants>DEBUG;</DefineConstants>
     <ErrorReport>prompt</ErrorReport>
     <WarningLevel>4</WarningLevel>
-    <Externalconsole>true</Externalconsole>
-    <PlatformTarget>x86</PlatformTarget>
+    <PlatformTarget>AnyCPU</PlatformTarget>
   </PropertyGroup>
-  <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Release|x86' ">
-    <DebugType>full</DebugType>
+  <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Release|AnyCPU' ">
+    <DebugType>pdbonly</DebugType>
     <Optimize>true</Optimize>
     <OutputPath>bin\Release</OutputPath>
     <ErrorReport>prompt</ErrorReport>
     <WarningLevel>4</WarningLevel>
-    <Externalconsole>true</Externalconsole>
-    <PlatformTarget>x86</PlatformTarget>
+    <PlatformTarget>AnyCPU</PlatformTarget>
+  </PropertyGroup>
+  <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'ReleaseSigned|AnyCPU' ">
+    <DebugType>pdbonly</DebugType>
+    <Optimize>true</Optimize>
+    <OutputPath>bin\ReleaseSigned</OutputPath>
+    <ErrorReport>prompt</ErrorReport>
+    <WarningLevel>4</WarningLevel>
+    <SignAssembly>True</SignAssembly>
+    <AssemblyOriginatorKeyFile>C:\keys\Grpc.snk</AssemblyOriginatorKeyFile>
   </PropertyGroup>
   <ItemGroup>
-    <Reference Include="Google.Apis.Auth, Version=1.9.1.12395, Culture=neutral, processorArchitecture=MSIL">
-      <SpecificVersion>False</SpecificVersion>
-      <HintPath>..\packages\Google.Apis.Auth.1.9.1\lib\net40\Google.Apis.Auth.dll</HintPath>
+    <Reference Include="BouncyCastle.Crypto">
+      <HintPath>..\packages\BouncyCastle.1.7.0\lib\Net40-Client\BouncyCastle.Crypto.dll</HintPath>
     </Reference>
-    <Reference Include="Google.Apis.Auth.PlatformServices, Version=1.9.1.12399, Culture=neutral, processorArchitecture=MSIL">
+    <Reference Include="Google.Apis.Auth, Version=1.9.2.27817, Culture=neutral, PublicKeyToken=4b01fa6e34db77ab, processorArchitecture=MSIL">
       <SpecificVersion>False</SpecificVersion>
-      <HintPath>..\packages\Google.Apis.Auth.1.9.1\lib\net40\Google.Apis.Auth.PlatformServices.dll</HintPath>
+      <HintPath>..\packages\Google.Apis.Auth.1.9.2\lib\net40\Google.Apis.Auth.dll</HintPath>
     </Reference>
-    <Reference Include="Google.Apis.Core, Version=1.9.1.12394, Culture=neutral, processorArchitecture=MSIL">
+    <Reference Include="Google.Apis.Auth.PlatformServices, Version=1.9.2.27820, Culture=neutral, PublicKeyToken=4b01fa6e34db77ab, processorArchitecture=MSIL">
       <SpecificVersion>False</SpecificVersion>
-      <HintPath>..\packages\Google.Apis.Core.1.9.1\lib\portable-net40+sl50+win+wpa81+wp80\Google.Apis.Core.dll</HintPath>
+      <HintPath>..\packages\Google.Apis.Auth.1.9.2\lib\net40\Google.Apis.Auth.PlatformServices.dll</HintPath>
     </Reference>
-    <Reference Include="Microsoft.Threading.Tasks, Version=1.0.12.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a, processorArchitecture=MSIL">
+    <Reference Include="Google.Apis.Core, Version=1.9.2.27816, Culture=neutral, PublicKeyToken=4b01fa6e34db77ab, processorArchitecture=MSIL">
       <SpecificVersion>False</SpecificVersion>
-      <HintPath>..\packages\Microsoft.Bcl.Async.1.0.168\lib\net40\Microsoft.Threading.Tasks.dll</HintPath>
+      <HintPath>..\packages\Google.Apis.Core.1.9.2\lib\portable-net40+sl50+win+wpa81+wp80\Google.Apis.Core.dll</HintPath>
     </Reference>
-    <Reference Include="Microsoft.Threading.Tasks.Extensions, Version=1.0.12.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a, processorArchitecture=MSIL">
+    <Reference Include="Newtonsoft.Json, Version=7.0.0.0, Culture=neutral, PublicKeyToken=30ad4fe6b2a6aeed, processorArchitecture=MSIL">
       <SpecificVersion>False</SpecificVersion>
-      <HintPath>..\packages\Microsoft.Bcl.Async.1.0.168\lib\net40\Microsoft.Threading.Tasks.Extensions.dll</HintPath>
-    </Reference>
-    <Reference Include="Microsoft.Threading.Tasks.Extensions.Desktop, Version=1.0.168.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a, processorArchitecture=MSIL">
-      <SpecificVersion>False</SpecificVersion>
-      <HintPath>..\packages\Microsoft.Bcl.Async.1.0.168\lib\net40\Microsoft.Threading.Tasks.Extensions.Desktop.dll</HintPath>
-    </Reference>
-    <Reference Include="Newtonsoft.Json, Version=6.0.0.0, Culture=neutral, PublicKeyToken=30ad4fe6b2a6aeed, processorArchitecture=MSIL">
-      <SpecificVersion>False</SpecificVersion>
-      <HintPath>..\packages\Newtonsoft.Json.6.0.6\lib\net45\Newtonsoft.Json.dll</HintPath>
+      <HintPath>..\packages\Newtonsoft.Json.7.0.1\lib\net45\Newtonsoft.Json.dll</HintPath>
     </Reference>
     <Reference Include="nunit.framework">
       <HintPath>..\packages\NUnit.2.6.4\lib\nunit.framework.dll</HintPath>
@@ -67,24 +64,29 @@
     <Reference Include="Google.ProtocolBuffers">
       <HintPath>..\packages\Google.ProtocolBuffers.2.4.1.521\lib\net40\Google.ProtocolBuffers.dll</HintPath>
     </Reference>
-    <Reference Include="System.Collections.Immutable, Version=1.1.36.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a, processorArchitecture=MSIL">
-      <SpecificVersion>False</SpecificVersion>
-      <HintPath>..\packages\System.Collections.Immutable.1.1.36\lib\portable-net45+win8+wp8+wpa81\System.Collections.Immutable.dll</HintPath>
-    </Reference>
     <Reference Include="System.Interactive.Async">
       <HintPath>..\packages\Ix-Async.1.2.3\lib\net45\System.Interactive.Async.dll</HintPath>
     </Reference>
     <Reference Include="System.Net" />
     <Reference Include="System.Net.Http" />
-    <Reference Include="System.Net.Http.Extensions, Version=2.2.28.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a, processorArchitecture=MSIL">
+    <Reference Include="System.Net.Http.Extensions, Version=2.2.29.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a, processorArchitecture=MSIL">
       <SpecificVersion>False</SpecificVersion>
-      <HintPath>..\packages\Microsoft.Net.Http.2.2.28\lib\net45\System.Net.Http.Extensions.dll</HintPath>
+      <HintPath>..\packages\Microsoft.Net.Http.2.2.29\lib\net45\System.Net.Http.Extensions.dll</HintPath>
     </Reference>
-    <Reference Include="System.Net.Http.Primitives, Version=4.2.28.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a, processorArchitecture=MSIL">
+    <Reference Include="System.Net.Http.Primitives, Version=4.2.29.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a, processorArchitecture=MSIL">
       <SpecificVersion>False</SpecificVersion>
-      <HintPath>..\packages\Microsoft.Net.Http.2.2.28\lib\net45\System.Net.Http.Primitives.dll</HintPath>
+      <HintPath>..\packages\Microsoft.Net.Http.2.2.29\lib\net45\System.Net.Http.Primitives.dll</HintPath>
     </Reference>
     <Reference Include="System.Net.Http.WebRequest" />
+    <Reference Include="Microsoft.Threading.Tasks">
+      <HintPath>..\packages\Microsoft.Bcl.Async.1.0.168\lib\net40\Microsoft.Threading.Tasks.dll</HintPath>
+    </Reference>
+    <Reference Include="Microsoft.Threading.Tasks.Extensions">
+      <HintPath>..\packages\Microsoft.Bcl.Async.1.0.168\lib\net40\Microsoft.Threading.Tasks.Extensions.dll</HintPath>
+    </Reference>
+    <Reference Include="Microsoft.Threading.Tasks.Extensions.Desktop">
+      <HintPath>..\packages\Microsoft.Bcl.Async.1.0.168\lib\net40\Microsoft.Threading.Tasks.Extensions.Desktop.dll</HintPath>
+    </Reference>
   </ItemGroup>
   <ItemGroup>
     <Compile Include="..\Grpc.Core\Version.cs">
@@ -99,6 +101,7 @@
     <Compile Include="InteropClient.cs" />
     <Compile Include="TestCredentials.cs" />
     <Compile Include="TestGrpc.cs" />
+    <Compile Include="SslCredentialsTest.cs" />
   </ItemGroup>
   <Import Project="$(MSBuildBinPath)\Microsoft.CSharp.targets" />
   <ItemGroup>
@@ -133,9 +136,11 @@
   <ItemGroup>
     <Service Include="{82A7F48D-3B50-4B1E-B82E-3ADA8210C358}" />
   </ItemGroup>
-  <Import Project="..\packages\Microsoft.Bcl.Build.1.0.14\tools\Microsoft.Bcl.Build.targets" Condition="Exists('..\packages\Microsoft.Bcl.Build.1.0.14\tools\Microsoft.Bcl.Build.targets')" />
-  <Target Name="EnsureBclBuildImported" BeforeTargets="BeforeBuild" Condition="'$(BclBuildImported)' == ''">
-    <Error Condition="!Exists('..\packages\Microsoft.Bcl.Build.1.0.14\tools\Microsoft.Bcl.Build.targets')" Text="This project references NuGet package(s) that are missing on this computer. Enable NuGet Package Restore to download them.  For more information, see http://go.microsoft.com/fwlink/?LinkID=317567." HelpKeyword="BCLBUILD2001" />
-    <Error Condition="Exists('..\packages\Microsoft.Bcl.Build.1.0.14\tools\Microsoft.Bcl.Build.targets')" Text="The build restored NuGet packages. Build the project again to include these packages in the build. For more information, see http://go.microsoft.com/fwlink/?LinkID=317568." HelpKeyword="BCLBUILD2002" />
+  <Import Project="..\packages\Microsoft.Bcl.Build.1.0.21\build\Microsoft.Bcl.Build.targets" Condition="Exists('..\packages\Microsoft.Bcl.Build.1.0.21\build\Microsoft.Bcl.Build.targets')" />
+  <Target Name="EnsureNuGetPackageBuildImports" BeforeTargets="PrepareForBuild">
+    <PropertyGroup>
+      <ErrorText>This project references NuGet package(s) that are missing on this computer. Enable NuGet Package Restore to download them.  For more information, see http://go.microsoft.com/fwlink/?LinkID=322105. The missing file is {0}.</ErrorText>
+    </PropertyGroup>
+    <Error Condition="!Exists('..\packages\Microsoft.Bcl.Build.1.0.21\build\Microsoft.Bcl.Build.targets')" Text="$([System.String]::Format('$(ErrorText)', '..\packages\Microsoft.Bcl.Build.1.0.21\build\Microsoft.Bcl.Build.targets'))" />
   </Target>
 </Project>
\ No newline at end of file
diff --git a/src/csharp/Grpc.IntegrationTesting/InteropClient.cs b/src/csharp/Grpc.IntegrationTesting/InteropClient.cs
index ce255f9423..7411d91d5a 100644
--- a/src/csharp/Grpc.IntegrationTesting/InteropClient.cs
+++ b/src/csharp/Grpc.IntegrationTesting/InteropClient.cs
@@ -127,15 +127,15 @@ namespace Grpc.IntegrationTesting
                     {
                         credential = credential.CreateScoped(new[] { AuthScope });
                     }
-                    client.HeaderInterceptor = OAuth2InterceptorFactory.Create(credential);
+                    client.HeaderInterceptor = OAuth2Interceptors.FromCredential(credential);
                 }
 
-                RunTestCase(options.testCase, client);
+                RunTestCaseAsync(options.testCase, client).Wait();
             }
             GrpcEnvironment.Shutdown();
         }
 
-        private void RunTestCase(string testCase, TestService.TestServiceClient client)
+        private async Task RunTestCaseAsync(string testCase, TestService.TestServiceClient client)
         {
             switch (testCase)
             {
@@ -146,16 +146,16 @@ namespace Grpc.IntegrationTesting
                     RunLargeUnary(client);
                     break;
                 case "client_streaming":
-                    RunClientStreaming(client);
+                    await RunClientStreamingAsync(client);
                     break;
                 case "server_streaming":
-                    RunServerStreaming(client);
+                    await RunServerStreamingAsync(client);
                     break;
                 case "ping_pong":
-                    RunPingPong(client);
+                    await RunPingPongAsync(client);
                     break;
                 case "empty_stream":
-                    RunEmptyStream(client);
+                    await RunEmptyStreamAsync(client);
                     break;
                 case "service_account_creds":
                     RunServiceAccountCreds(client);
@@ -170,10 +170,10 @@ namespace Grpc.IntegrationTesting
                     RunPerRpcCreds(client);
                     break;
                 case "cancel_after_begin":
-                    RunCancelAfterBegin(client);
+                    await RunCancelAfterBeginAsync(client);
                     break;
                 case "cancel_after_first_response":
-                    RunCancelAfterFirstResponse(client);
+                    await RunCancelAfterFirstResponseAsync(client);
                     break;
                 case "benchmark_empty_unary":
                     RunBenchmarkEmptyUnary(client);
@@ -207,118 +207,106 @@ namespace Grpc.IntegrationTesting
             Console.WriteLine("Passed!");
         }
 
-        public static void RunClientStreaming(TestService.ITestServiceClient client)
+        public static async Task RunClientStreamingAsync(TestService.ITestServiceClient client)
         {
-            Task.Run(async () =>
-            {
-                Console.WriteLine("running client_streaming");
+            Console.WriteLine("running client_streaming");
 
-                var bodySizes = new List<int> { 27182, 8, 1828, 45904 }.ConvertAll((size) => StreamingInputCallRequest.CreateBuilder().SetPayload(CreateZerosPayload(size)).Build());
+            var bodySizes = new List<int> { 27182, 8, 1828, 45904 }.ConvertAll((size) => StreamingInputCallRequest.CreateBuilder().SetPayload(CreateZerosPayload(size)).Build());
 
-                using (var call = client.StreamingInputCall())
-                {
-                    await call.RequestStream.WriteAll(bodySizes);
+            using (var call = client.StreamingInputCall())
+            {
+                await call.RequestStream.WriteAll(bodySizes);
 
-                    var response = await call.ResponseAsync;
-                    Assert.AreEqual(74922, response.AggregatedPayloadSize);
-                }
-                Console.WriteLine("Passed!");
-            }).Wait();
+                var response = await call.ResponseAsync;
+                Assert.AreEqual(74922, response.AggregatedPayloadSize);
+            }
+            Console.WriteLine("Passed!");
         }
 
-        public static void RunServerStreaming(TestService.ITestServiceClient client)
+        public static async Task RunServerStreamingAsync(TestService.ITestServiceClient client)
         {
-            Task.Run(async () =>
-            {
-                Console.WriteLine("running server_streaming");
+            Console.WriteLine("running server_streaming");
 
-                var bodySizes = new List<int> { 31415, 9, 2653, 58979 };
+            var bodySizes = new List<int> { 31415, 9, 2653, 58979 };
 
-                var request = StreamingOutputCallRequest.CreateBuilder()
-                .SetResponseType(PayloadType.COMPRESSABLE)
-                .AddRangeResponseParameters(bodySizes.ConvertAll(
-                    (size) => ResponseParameters.CreateBuilder().SetSize(size).Build()))
-                .Build();
+            var request = StreamingOutputCallRequest.CreateBuilder()
+            .SetResponseType(PayloadType.COMPRESSABLE)
+            .AddRangeResponseParameters(bodySizes.ConvertAll(
+                (size) => ResponseParameters.CreateBuilder().SetSize(size).Build()))
+            .Build();
 
-                using (var call = client.StreamingOutputCall(request))
+            using (var call = client.StreamingOutputCall(request))
+            {
+                var responseList = await call.ResponseStream.ToList();
+                foreach (var res in responseList)
                 {
-                    var responseList = await call.ResponseStream.ToList();
-                    foreach (var res in responseList)
-                    {
-                        Assert.AreEqual(PayloadType.COMPRESSABLE, res.Payload.Type);
-                    }
-                    CollectionAssert.AreEqual(bodySizes, responseList.ConvertAll((item) => item.Payload.Body.Length));
+                    Assert.AreEqual(PayloadType.COMPRESSABLE, res.Payload.Type);
                 }
-                Console.WriteLine("Passed!");
-            }).Wait();
+                CollectionAssert.AreEqual(bodySizes, responseList.ConvertAll((item) => item.Payload.Body.Length));
+            }
+            Console.WriteLine("Passed!");
         }
 
-        public static void RunPingPong(TestService.ITestServiceClient client)
+        public static async Task RunPingPongAsync(TestService.ITestServiceClient client)
         {
-            Task.Run(async () =>
-            {
-                Console.WriteLine("running ping_pong");
+            Console.WriteLine("running ping_pong");
 
-                using (var call = client.FullDuplexCall())
-                {
-                    await call.RequestStream.WriteAsync(StreamingOutputCallRequest.CreateBuilder()
-                    .SetResponseType(PayloadType.COMPRESSABLE)
-                    .AddResponseParameters(ResponseParameters.CreateBuilder().SetSize(31415))
-                    .SetPayload(CreateZerosPayload(27182)).Build());
+            using (var call = client.FullDuplexCall())
+            {
+                await call.RequestStream.WriteAsync(StreamingOutputCallRequest.CreateBuilder()
+                .SetResponseType(PayloadType.COMPRESSABLE)
+                .AddResponseParameters(ResponseParameters.CreateBuilder().SetSize(31415))
+                .SetPayload(CreateZerosPayload(27182)).Build());
 
-                    Assert.IsTrue(await call.ResponseStream.MoveNext());
-                    Assert.AreEqual(PayloadType.COMPRESSABLE, call.ResponseStream.Current.Payload.Type);
-                    Assert.AreEqual(31415, call.ResponseStream.Current.Payload.Body.Length);
+                Assert.IsTrue(await call.ResponseStream.MoveNext());
+                Assert.AreEqual(PayloadType.COMPRESSABLE, call.ResponseStream.Current.Payload.Type);
+                Assert.AreEqual(31415, call.ResponseStream.Current.Payload.Body.Length);
 
-                    await call.RequestStream.WriteAsync(StreamingOutputCallRequest.CreateBuilder()
-                              .SetResponseType(PayloadType.COMPRESSABLE)
-                              .AddResponseParameters(ResponseParameters.CreateBuilder().SetSize(9))
-                              .SetPayload(CreateZerosPayload(8)).Build());
+                await call.RequestStream.WriteAsync(StreamingOutputCallRequest.CreateBuilder()
+                            .SetResponseType(PayloadType.COMPRESSABLE)
+                            .AddResponseParameters(ResponseParameters.CreateBuilder().SetSize(9))
+                            .SetPayload(CreateZerosPayload(8)).Build());
 
-                    Assert.IsTrue(await call.ResponseStream.MoveNext());
-                    Assert.AreEqual(PayloadType.COMPRESSABLE, call.ResponseStream.Current.Payload.Type);
-                    Assert.AreEqual(9, call.ResponseStream.Current.Payload.Body.Length);
+                Assert.IsTrue(await call.ResponseStream.MoveNext());
+                Assert.AreEqual(PayloadType.COMPRESSABLE, call.ResponseStream.Current.Payload.Type);
+                Assert.AreEqual(9, call.ResponseStream.Current.Payload.Body.Length);
 
-                    await call.RequestStream.WriteAsync(StreamingOutputCallRequest.CreateBuilder()
-                              .SetResponseType(PayloadType.COMPRESSABLE)
-                              .AddResponseParameters(ResponseParameters.CreateBuilder().SetSize(2653))
-                              .SetPayload(CreateZerosPayload(1828)).Build());
+                await call.RequestStream.WriteAsync(StreamingOutputCallRequest.CreateBuilder()
+                            .SetResponseType(PayloadType.COMPRESSABLE)
+                            .AddResponseParameters(ResponseParameters.CreateBuilder().SetSize(2653))
+                            .SetPayload(CreateZerosPayload(1828)).Build());
 
-                    Assert.IsTrue(await call.ResponseStream.MoveNext());
-                    Assert.AreEqual(PayloadType.COMPRESSABLE, call.ResponseStream.Current.Payload.Type);
-                    Assert.AreEqual(2653, call.ResponseStream.Current.Payload.Body.Length);
+                Assert.IsTrue(await call.ResponseStream.MoveNext());
+                Assert.AreEqual(PayloadType.COMPRESSABLE, call.ResponseStream.Current.Payload.Type);
+                Assert.AreEqual(2653, call.ResponseStream.Current.Payload.Body.Length);
 
-                    await call.RequestStream.WriteAsync(StreamingOutputCallRequest.CreateBuilder()
-                              .SetResponseType(PayloadType.COMPRESSABLE)
-                              .AddResponseParameters(ResponseParameters.CreateBuilder().SetSize(58979))
-                              .SetPayload(CreateZerosPayload(45904)).Build());
+                await call.RequestStream.WriteAsync(StreamingOutputCallRequest.CreateBuilder()
+                            .SetResponseType(PayloadType.COMPRESSABLE)
+                            .AddResponseParameters(ResponseParameters.CreateBuilder().SetSize(58979))
+                            .SetPayload(CreateZerosPayload(45904)).Build());
 
-                    Assert.IsTrue(await call.ResponseStream.MoveNext());
-                    Assert.AreEqual(PayloadType.COMPRESSABLE, call.ResponseStream.Current.Payload.Type);
-                    Assert.AreEqual(58979, call.ResponseStream.Current.Payload.Body.Length);
+                Assert.IsTrue(await call.ResponseStream.MoveNext());
+                Assert.AreEqual(PayloadType.COMPRESSABLE, call.ResponseStream.Current.Payload.Type);
+                Assert.AreEqual(58979, call.ResponseStream.Current.Payload.Body.Length);
 
-                    await call.RequestStream.CompleteAsync();
+                await call.RequestStream.CompleteAsync();
 
-                    Assert.IsFalse(await call.ResponseStream.MoveNext());
-                }
-                Console.WriteLine("Passed!");
-            }).Wait();
+                Assert.IsFalse(await call.ResponseStream.MoveNext());
+            }
+            Console.WriteLine("Passed!");
         }
 
-        public static void RunEmptyStream(TestService.ITestServiceClient client)
+        public static async Task RunEmptyStreamAsync(TestService.ITestServiceClient client)
         {
-            Task.Run(async () =>
+            Console.WriteLine("running empty_stream");
+            using (var call = client.FullDuplexCall())
             {
-                Console.WriteLine("running empty_stream");
-                using (var call = client.FullDuplexCall())
-                {
-                    await call.RequestStream.CompleteAsync();
+                await call.RequestStream.CompleteAsync();
 
-                    var responseList = await call.ResponseStream.ToList();
-                    Assert.AreEqual(0, responseList.Count);
-                }
-                Console.WriteLine("Passed!");
-            }).Wait();
+                var responseList = await call.ResponseStream.ToList();
+                Assert.AreEqual(0, responseList.Count);
+            }
+            Console.WriteLine("Passed!");
         }
 
         public static void RunServiceAccountCreds(TestService.ITestServiceClient client)
@@ -368,11 +356,7 @@ namespace Grpc.IntegrationTesting
             Assert.IsTrue(credential.RequestAccessTokenAsync(CancellationToken.None).Result);
             string oauth2Token = credential.Token.AccessToken;
 
-            // Intercept calls with an OAuth2 token obtained out-of-band.
-            client.HeaderInterceptor = new MetadataInterceptorDelegate((metadata) =>
-            {
-                metadata.Add(new Metadata.Entry("Authorization", "Bearer " + oauth2Token));
-            });
+            client.HeaderInterceptor = OAuth2Interceptors.FromAccessToken(oauth2Token);
 
             var request = SimpleRequest.CreateBuilder()
                 .SetFillUsername(true)
@@ -393,78 +377,75 @@ namespace Grpc.IntegrationTesting
             var credential = GoogleCredential.GetApplicationDefault().CreateScoped(new[] { AuthScope });
             Assert.IsTrue(credential.RequestAccessTokenAsync(CancellationToken.None).Result);
             string oauth2Token = credential.Token.AccessToken;
+            var headerInterceptor = OAuth2Interceptors.FromAccessToken(oauth2Token);
 
             var request = SimpleRequest.CreateBuilder()
                 .SetFillUsername(true)
                 .SetFillOauthScope(true)
                 .Build();
 
-            var response = client.UnaryCall(request, headers: new Metadata { new Metadata.Entry("Authorization", "Bearer " + oauth2Token) });
+            var headers = new Metadata();
+            headerInterceptor(headers);
+            var response = client.UnaryCall(request, headers: headers);
 
             Assert.AreEqual(AuthScopeResponse, response.OauthScope);
             Assert.AreEqual(ServiceAccountUser, response.Username);
             Console.WriteLine("Passed!");
         }
 
-        public static void RunCancelAfterBegin(TestService.ITestServiceClient client)
+        public static async Task RunCancelAfterBeginAsync(TestService.ITestServiceClient client)
         {
-            Task.Run(async () =>
+            Console.WriteLine("running cancel_after_begin");
+
+            var cts = new CancellationTokenSource();
+            using (var call = client.StreamingInputCall(cancellationToken: cts.Token))
             {
-                Console.WriteLine("running cancel_after_begin");
+                // TODO(jtattermusch): we need this to ensure call has been initiated once we cancel it.
+                await Task.Delay(1000);
+                cts.Cancel();
 
-                var cts = new CancellationTokenSource();
-                using (var call = client.StreamingInputCall(cancellationToken: cts.Token))
+                try
                 {
-                    // TODO(jtattermusch): we need this to ensure call has been initiated once we cancel it.
-                    await Task.Delay(1000);
-                    cts.Cancel();
-
-                    try
-                    {
-                        var response = await call.ResponseAsync;
-                        Assert.Fail();
-                    }
-                    catch (RpcException e)
-                    {
-                        Assert.AreEqual(StatusCode.Cancelled, e.Status.StatusCode);
-                    }
+                    var response = await call.ResponseAsync;
+                    Assert.Fail();
+                }
+                catch (RpcException e)
+                {
+                    Assert.AreEqual(StatusCode.Cancelled, e.Status.StatusCode);
                 }
-                Console.WriteLine("Passed!");
-            }).Wait();
+            }
+            Console.WriteLine("Passed!");
         }
 
-        public static void RunCancelAfterFirstResponse(TestService.ITestServiceClient client)
+        public static async Task RunCancelAfterFirstResponseAsync(TestService.ITestServiceClient client)
         {
-            Task.Run(async () =>
-            {
-                Console.WriteLine("running cancel_after_first_response");
+            Console.WriteLine("running cancel_after_first_response");
 
-                var cts = new CancellationTokenSource();
-                using (var call = client.FullDuplexCall(cancellationToken: cts.Token))
-                {
-                    await call.RequestStream.WriteAsync(StreamingOutputCallRequest.CreateBuilder()
-                        .SetResponseType(PayloadType.COMPRESSABLE)
-                        .AddResponseParameters(ResponseParameters.CreateBuilder().SetSize(31415))
-                        .SetPayload(CreateZerosPayload(27182)).Build());
+            var cts = new CancellationTokenSource();
+            using (var call = client.FullDuplexCall(cancellationToken: cts.Token))
+            {
+                await call.RequestStream.WriteAsync(StreamingOutputCallRequest.CreateBuilder()
+                    .SetResponseType(PayloadType.COMPRESSABLE)
+                    .AddResponseParameters(ResponseParameters.CreateBuilder().SetSize(31415))
+                    .SetPayload(CreateZerosPayload(27182)).Build());
 
-                    Assert.IsTrue(await call.ResponseStream.MoveNext());
-                    Assert.AreEqual(PayloadType.COMPRESSABLE, call.ResponseStream.Current.Payload.Type);
-                    Assert.AreEqual(31415, call.ResponseStream.Current.Payload.Body.Length);
+                Assert.IsTrue(await call.ResponseStream.MoveNext());
+                Assert.AreEqual(PayloadType.COMPRESSABLE, call.ResponseStream.Current.Payload.Type);
+                Assert.AreEqual(31415, call.ResponseStream.Current.Payload.Body.Length);
 
-                    cts.Cancel();
+                cts.Cancel();
 
-                    try
-                    {
-                        await call.ResponseStream.MoveNext();
-                        Assert.Fail();
-                    }
-                    catch (RpcException e)
-                    {
-                        Assert.AreEqual(StatusCode.Cancelled, e.Status.StatusCode);
-                    }
+                try
+                {
+                    await call.ResponseStream.MoveNext();
+                    Assert.Fail();
                 }
-                Console.WriteLine("Passed!");
-            }).Wait();
+                catch (RpcException e)
+                {
+                    Assert.AreEqual(StatusCode.Cancelled, e.Status.StatusCode);
+                }
+            }
+            Console.WriteLine("Passed!");
         }
 
         // This is not an official interop test, but it's useful.
diff --git a/src/csharp/Grpc.IntegrationTesting/InteropClientServerTest.cs b/src/csharp/Grpc.IntegrationTesting/InteropClientServerTest.cs
index f306289cfb..6fa721bc1c 100644
--- a/src/csharp/Grpc.IntegrationTesting/InteropClientServerTest.cs
+++ b/src/csharp/Grpc.IntegrationTesting/InteropClientServerTest.cs
@@ -33,6 +33,7 @@
 
 using System;
 using System.Collections.Generic;
+using System.Linq;
 using System.Threading;
 using System.Threading.Tasks;
 using grpc.testing;
@@ -47,7 +48,7 @@ namespace Grpc.IntegrationTesting
     /// </summary>
     public class InteropClientServerTest
     {
-        string host = "localhost";
+        const string Host = "localhost";
         Server server;
         Channel channel;
         TestService.ITestServiceClient client;
@@ -55,16 +56,19 @@ namespace Grpc.IntegrationTesting
         [TestFixtureSetUp]
         public void Init()
         {
-            server = new Server();
-            server.AddServiceDefinition(TestService.BindService(new TestServiceImpl()));
-            int port = server.AddListeningPort(host, Server.PickUnusedPort, TestCredentials.CreateTestServerCredentials());
+            server = new Server
+            {
+                Services = { TestService.BindService(new TestServiceImpl()) },
+                Ports = { { Host, ServerPort.PickUnused, TestCredentials.CreateTestServerCredentials() } }
+            };
             server.Start();
 
             var options = new List<ChannelOption>
             {
                 new ChannelOption(ChannelOptions.SslTargetNameOverride, TestCredentials.DefaultHostOverride)
             };
-            channel = new Channel(host, port, TestCredentials.CreateTestClientCredentials(true), options);
+            int port = server.Ports.Single().BoundPort;
+            channel = new Channel(Host, port, TestCredentials.CreateTestClientCredentials(true), options);
             client = TestService.NewClient(channel);
         }
 
@@ -89,39 +93,39 @@ namespace Grpc.IntegrationTesting
         }
 
         [Test]
-        public void ClientStreaming()
+        public async Task ClientStreaming()
         {
-            InteropClient.RunClientStreaming(client);
+            await InteropClient.RunClientStreamingAsync(client);
         }
 
         [Test]
-        public void ServerStreaming()
+        public async Task ServerStreaming()
         {
-            InteropClient.RunServerStreaming(client);
+            await InteropClient.RunServerStreamingAsync(client);
         }
 
         [Test]
-        public void PingPong()
+        public async Task PingPong()
         {
-            InteropClient.RunPingPong(client);
+            await InteropClient.RunPingPongAsync(client);
         }
 
         [Test]
-        public void EmptyStream()
+        public async Task EmptyStream()
         {
-            InteropClient.RunEmptyStream(client);
+            await InteropClient.RunEmptyStreamAsync(client);
         }
 
         [Test]
-        public void CancelAfterBegin()
+        public async Task CancelAfterBegin()
         {
-            InteropClient.RunCancelAfterBegin(client);
+            await InteropClient.RunCancelAfterBeginAsync(client);
         }
 
         [Test]
-        public void CancelAfterFirstResponse()
+        public async Task CancelAfterFirstResponse()
         {
-            InteropClient.RunCancelAfterFirstResponse(client);
+            await InteropClient.RunCancelAfterFirstResponseAsync(client);
         }
     }
 }
diff --git a/src/csharp/Grpc.IntegrationTesting/InteropServer.cs b/src/csharp/Grpc.IntegrationTesting/InteropServer.cs
index 9475e66c40..504fd11857 100644
--- a/src/csharp/Grpc.IntegrationTesting/InteropServer.cs
+++ b/src/csharp/Grpc.IntegrationTesting/InteropServer.cs
@@ -88,18 +88,20 @@ namespace Grpc.IntegrationTesting
 
         private void Run()
         {
-            var server = new Server();
-            server.AddServiceDefinition(TestService.BindService(new TestServiceImpl()));
+            var server = new Server
+            {
+                Services = { TestService.BindService(new TestServiceImpl()) }
+            };
 
             string host = "0.0.0.0";
             int port = options.port.Value;
             if (options.useTls)
             {
-                server.AddListeningPort(host, port, TestCredentials.CreateTestServerCredentials());
+                server.Ports.Add(host, port, TestCredentials.CreateTestServerCredentials());
             }
             else
             {
-                server.AddListeningPort(host, options.port.Value);
+                server.Ports.Add(host, options.port.Value, ServerCredentials.Insecure);
             }
             Console.WriteLine("Running server on " + string.Format("{0}:{1}", host, port));
             server.Start();
diff --git a/src/csharp/Grpc.IntegrationTesting/SslCredentialsTest.cs b/src/csharp/Grpc.IntegrationTesting/SslCredentialsTest.cs
new file mode 100644
index 0000000000..1c398eb84e
--- /dev/null
+++ b/src/csharp/Grpc.IntegrationTesting/SslCredentialsTest.cs
@@ -0,0 +1,100 @@
+#region Copyright notice and license
+
+// Copyright 2015, Google Inc.
+// All rights reserved.
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+#endregion
+
+using System;
+using System.Collections.Generic;
+using System.IO;
+using System.Linq;
+using System.Threading;
+using System.Threading.Tasks;
+using grpc.testing;
+using Grpc.Core;
+using Grpc.Core.Utils;
+using NUnit.Framework;
+
+namespace Grpc.IntegrationTesting
+{
+    /// <summary>
+    /// Test SSL credentials where server authenticates client 
+    /// and client authenticates the server.
+    /// </summary>
+    public class SslCredentialsTest
+    {
+        const string Host = "localhost";
+        Server server;
+        Channel channel;
+        TestService.ITestServiceClient client;
+
+        [TestFixtureSetUp]
+        public void Init()
+        {
+            var rootCert = File.ReadAllText(TestCredentials.ClientCertAuthorityPath);
+            var keyCertPair = new KeyCertificatePair(
+                File.ReadAllText(TestCredentials.ServerCertChainPath),
+                File.ReadAllText(TestCredentials.ServerPrivateKeyPath));
+
+            var serverCredentials = new SslServerCredentials(new[] { keyCertPair }, rootCert, true);
+            var clientCredentials = new SslCredentials(rootCert, keyCertPair);
+
+            server = new Server
+            {
+                Services = { TestService.BindService(new TestServiceImpl()) },
+                Ports = { { Host, ServerPort.PickUnused, serverCredentials } }
+            };
+            server.Start();
+
+            var options = new List<ChannelOption>
+            {
+                new ChannelOption(ChannelOptions.SslTargetNameOverride, TestCredentials.DefaultHostOverride)
+            };
+
+            channel = new Channel(Host, server.Ports.Single().BoundPort, clientCredentials, options);
+            client = TestService.NewClient(channel);
+        }
+
+        [TestFixtureTearDown]
+        public void Cleanup()
+        {
+            channel.Dispose();
+            server.ShutdownAsync().Wait();
+            GrpcEnvironment.Shutdown();
+        }
+
+        [Test]
+        public void AuthenticatedClientAndServer()
+        {
+            var response = client.UnaryCall(SimpleRequest.CreateBuilder().SetResponseSize(10).Build());
+            Assert.AreEqual(10, response.Payload.Body.Length);
+        }
+    }
+}
diff --git a/src/csharp/Grpc.IntegrationTesting/TestCredentials.cs b/src/csharp/Grpc.IntegrationTesting/TestCredentials.cs
index 401c50b1ae..da0b7fb910 100644
--- a/src/csharp/Grpc.IntegrationTesting/TestCredentials.cs
+++ b/src/csharp/Grpc.IntegrationTesting/TestCredentials.cs
@@ -33,7 +33,6 @@
 
 using System;
 using System.Collections.Generic;
-using System.Collections.Immutable;
 using System.Diagnostics;
 using System.IO;
 using System.Text.RegularExpressions;
@@ -78,7 +77,7 @@ namespace Grpc.IntegrationTesting
             var keyCertPair = new KeyCertificatePair(
                 File.ReadAllText(ServerCertChainPath),
                 File.ReadAllText(ServerPrivateKeyPath));
-            return new SslServerCredentials(ImmutableList.Create(keyCertPair));
+            return new SslServerCredentials(new[] { keyCertPair });
         }
     }
 }
diff --git a/src/csharp/Grpc.IntegrationTesting/TestGrpc.cs b/src/csharp/Grpc.IntegrationTesting/TestGrpc.cs
index de2fa07441..697acb53d8 100644
--- a/src/csharp/Grpc.IntegrationTesting/TestGrpc.cs
+++ b/src/csharp/Grpc.IntegrationTesting/TestGrpc.cs
@@ -22,36 +22,42 @@ namespace grpc.testing {
 
     static readonly Method<global::grpc.testing.Empty, global::grpc.testing.Empty> __Method_EmptyCall = new Method<global::grpc.testing.Empty, global::grpc.testing.Empty>(
         MethodType.Unary,
+        __ServiceName,
         "EmptyCall",
         __Marshaller_Empty,
         __Marshaller_Empty);
 
     static readonly Method<global::grpc.testing.SimpleRequest, global::grpc.testing.SimpleResponse> __Method_UnaryCall = new Method<global::grpc.testing.SimpleRequest, global::grpc.testing.SimpleResponse>(
         MethodType.Unary,
+        __ServiceName,
         "UnaryCall",
         __Marshaller_SimpleRequest,
         __Marshaller_SimpleResponse);
 
     static readonly Method<global::grpc.testing.StreamingOutputCallRequest, global::grpc.testing.StreamingOutputCallResponse> __Method_StreamingOutputCall = new Method<global::grpc.testing.StreamingOutputCallRequest, global::grpc.testing.StreamingOutputCallResponse>(
         MethodType.ServerStreaming,
+        __ServiceName,
         "StreamingOutputCall",
         __Marshaller_StreamingOutputCallRequest,
         __Marshaller_StreamingOutputCallResponse);
 
     static readonly Method<global::grpc.testing.StreamingInputCallRequest, global::grpc.testing.StreamingInputCallResponse> __Method_StreamingInputCall = new Method<global::grpc.testing.StreamingInputCallRequest, global::grpc.testing.StreamingInputCallResponse>(
         MethodType.ClientStreaming,
+        __ServiceName,
         "StreamingInputCall",
         __Marshaller_StreamingInputCallRequest,
         __Marshaller_StreamingInputCallResponse);
 
     static readonly Method<global::grpc.testing.StreamingOutputCallRequest, global::grpc.testing.StreamingOutputCallResponse> __Method_FullDuplexCall = new Method<global::grpc.testing.StreamingOutputCallRequest, global::grpc.testing.StreamingOutputCallResponse>(
         MethodType.DuplexStreaming,
+        __ServiceName,
         "FullDuplexCall",
         __Marshaller_StreamingOutputCallRequest,
         __Marshaller_StreamingOutputCallResponse);
 
     static readonly Method<global::grpc.testing.StreamingOutputCallRequest, global::grpc.testing.StreamingOutputCallResponse> __Method_HalfDuplexCall = new Method<global::grpc.testing.StreamingOutputCallRequest, global::grpc.testing.StreamingOutputCallResponse>(
         MethodType.DuplexStreaming,
+        __ServiceName,
         "HalfDuplexCall",
         __Marshaller_StreamingOutputCallRequest,
         __Marshaller_StreamingOutputCallResponse);
@@ -59,14 +65,22 @@ namespace grpc.testing {
     // client interface
     public interface ITestServiceClient
     {
-      global::grpc.testing.Empty EmptyCall(global::grpc.testing.Empty request, Metadata headers = null, CancellationToken cancellationToken = default(CancellationToken));
-      AsyncUnaryCall<global::grpc.testing.Empty> EmptyCallAsync(global::grpc.testing.Empty request, Metadata headers = null, CancellationToken cancellationToken = default(CancellationToken));
-      global::grpc.testing.SimpleResponse UnaryCall(global::grpc.testing.SimpleRequest request, Metadata headers = null, CancellationToken cancellationToken = default(CancellationToken));
-      AsyncUnaryCall<global::grpc.testing.SimpleResponse> UnaryCallAsync(global::grpc.testing.SimpleRequest request, Metadata headers = null, CancellationToken cancellationToken = default(CancellationToken));
-      AsyncServerStreamingCall<global::grpc.testing.StreamingOutputCallResponse> StreamingOutputCall(global::grpc.testing.StreamingOutputCallRequest request, Metadata headers = null, CancellationToken cancellationToken = default(CancellationToken));
-      AsyncClientStreamingCall<global::grpc.testing.StreamingInputCallRequest, global::grpc.testing.StreamingInputCallResponse> StreamingInputCall(Metadata headers = null, CancellationToken cancellationToken = default(CancellationToken));
-      AsyncDuplexStreamingCall<global::grpc.testing.StreamingOutputCallRequest, global::grpc.testing.StreamingOutputCallResponse> FullDuplexCall(Metadata headers = null, CancellationToken cancellationToken = default(CancellationToken));
-      AsyncDuplexStreamingCall<global::grpc.testing.StreamingOutputCallRequest, global::grpc.testing.StreamingOutputCallResponse> HalfDuplexCall(Metadata headers = null, CancellationToken cancellationToken = default(CancellationToken));
+      global::grpc.testing.Empty EmptyCall(global::grpc.testing.Empty request, Metadata headers = null, DateTime? deadline = null, CancellationToken cancellationToken = default(CancellationToken));
+      global::grpc.testing.Empty EmptyCall(global::grpc.testing.Empty request, CallOptions options);
+      AsyncUnaryCall<global::grpc.testing.Empty> EmptyCallAsync(global::grpc.testing.Empty request, Metadata headers = null, DateTime? deadline = null, CancellationToken cancellationToken = default(CancellationToken));
+      AsyncUnaryCall<global::grpc.testing.Empty> EmptyCallAsync(global::grpc.testing.Empty request, CallOptions options);
+      global::grpc.testing.SimpleResponse UnaryCall(global::grpc.testing.SimpleRequest request, Metadata headers = null, DateTime? deadline = null, CancellationToken cancellationToken = default(CancellationToken));
+      global::grpc.testing.SimpleResponse UnaryCall(global::grpc.testing.SimpleRequest request, CallOptions options);
+      AsyncUnaryCall<global::grpc.testing.SimpleResponse> UnaryCallAsync(global::grpc.testing.SimpleRequest request, Metadata headers = null, DateTime? deadline = null, CancellationToken cancellationToken = default(CancellationToken));
+      AsyncUnaryCall<global::grpc.testing.SimpleResponse> UnaryCallAsync(global::grpc.testing.SimpleRequest request, CallOptions options);
+      AsyncServerStreamingCall<global::grpc.testing.StreamingOutputCallResponse> StreamingOutputCall(global::grpc.testing.StreamingOutputCallRequest request, Metadata headers = null, DateTime? deadline = null, CancellationToken cancellationToken = default(CancellationToken));
+      AsyncServerStreamingCall<global::grpc.testing.StreamingOutputCallResponse> StreamingOutputCall(global::grpc.testing.StreamingOutputCallRequest request, CallOptions options);
+      AsyncClientStreamingCall<global::grpc.testing.StreamingInputCallRequest, global::grpc.testing.StreamingInputCallResponse> StreamingInputCall(Metadata headers = null, DateTime? deadline = null, CancellationToken cancellationToken = default(CancellationToken));
+      AsyncClientStreamingCall<global::grpc.testing.StreamingInputCallRequest, global::grpc.testing.StreamingInputCallResponse> StreamingInputCall(CallOptions options);
+      AsyncDuplexStreamingCall<global::grpc.testing.StreamingOutputCallRequest, global::grpc.testing.StreamingOutputCallResponse> FullDuplexCall(Metadata headers = null, DateTime? deadline = null, CancellationToken cancellationToken = default(CancellationToken));
+      AsyncDuplexStreamingCall<global::grpc.testing.StreamingOutputCallRequest, global::grpc.testing.StreamingOutputCallResponse> FullDuplexCall(CallOptions options);
+      AsyncDuplexStreamingCall<global::grpc.testing.StreamingOutputCallRequest, global::grpc.testing.StreamingOutputCallResponse> HalfDuplexCall(Metadata headers = null, DateTime? deadline = null, CancellationToken cancellationToken = default(CancellationToken));
+      AsyncDuplexStreamingCall<global::grpc.testing.StreamingOutputCallRequest, global::grpc.testing.StreamingOutputCallResponse> HalfDuplexCall(CallOptions options);
     }
 
     // server-side interface
@@ -86,45 +100,85 @@ namespace grpc.testing {
       public TestServiceClient(Channel channel) : base(channel)
       {
       }
-      public global::grpc.testing.Empty EmptyCall(global::grpc.testing.Empty request, Metadata headers = null, CancellationToken cancellationToken = default(CancellationToken))
+      public global::grpc.testing.Empty EmptyCall(global::grpc.testing.Empty request, Metadata headers = null, DateTime? deadline = null, CancellationToken cancellationToken = default(CancellationToken))
       {
-        var call = CreateCall(__ServiceName, __Method_EmptyCall, headers);
-        return Calls.BlockingUnaryCall(call, request, cancellationToken);
+        var call = CreateCall(__Method_EmptyCall, new CallOptions(headers, deadline, cancellationToken));
+        return Calls.BlockingUnaryCall(call, request);
       }
-      public AsyncUnaryCall<global::grpc.testing.Empty> EmptyCallAsync(global::grpc.testing.Empty request, Metadata headers = null, CancellationToken cancellationToken = default(CancellationToken))
+      public global::grpc.testing.Empty EmptyCall(global::grpc.testing.Empty request, CallOptions options)
       {
-        var call = CreateCall(__ServiceName, __Method_EmptyCall, headers);
-        return Calls.AsyncUnaryCall(call, request, cancellationToken);
+        var call = CreateCall(__Method_EmptyCall, options);
+        return Calls.BlockingUnaryCall(call, request);
       }
-      public global::grpc.testing.SimpleResponse UnaryCall(global::grpc.testing.SimpleRequest request, Metadata headers = null, CancellationToken cancellationToken = default(CancellationToken))
+      public AsyncUnaryCall<global::grpc.testing.Empty> EmptyCallAsync(global::grpc.testing.Empty request, Metadata headers = null, DateTime? deadline = null, CancellationToken cancellationToken = default(CancellationToken))
       {
-        var call = CreateCall(__ServiceName, __Method_UnaryCall, headers);
-        return Calls.BlockingUnaryCall(call, request, cancellationToken);
+        var call = CreateCall(__Method_EmptyCall, new CallOptions(headers, deadline, cancellationToken));
+        return Calls.AsyncUnaryCall(call, request);
       }
-      public AsyncUnaryCall<global::grpc.testing.SimpleResponse> UnaryCallAsync(global::grpc.testing.SimpleRequest request, Metadata headers = null, CancellationToken cancellationToken = default(CancellationToken))
+      public AsyncUnaryCall<global::grpc.testing.Empty> EmptyCallAsync(global::grpc.testing.Empty request, CallOptions options)
       {
-        var call = CreateCall(__ServiceName, __Method_UnaryCall, headers);
-        return Calls.AsyncUnaryCall(call, request, cancellationToken);
+        var call = CreateCall(__Method_EmptyCall, options);
+        return Calls.AsyncUnaryCall(call, request);
       }
-      public AsyncServerStreamingCall<global::grpc.testing.StreamingOutputCallResponse> StreamingOutputCall(global::grpc.testing.StreamingOutputCallRequest request, Metadata headers = null, CancellationToken cancellationToken = default(CancellationToken))
+      public global::grpc.testing.SimpleResponse UnaryCall(global::grpc.testing.SimpleRequest request, Metadata headers = null, DateTime? deadline = null, CancellationToken cancellationToken = default(CancellationToken))
       {
-        var call = CreateCall(__ServiceName, __Method_StreamingOutputCall, headers);
-        return Calls.AsyncServerStreamingCall(call, request, cancellationToken);
+        var call = CreateCall(__Method_UnaryCall, new CallOptions(headers, deadline, cancellationToken));
+        return Calls.BlockingUnaryCall(call, request);
       }
-      public AsyncClientStreamingCall<global::grpc.testing.StreamingInputCallRequest, global::grpc.testing.StreamingInputCallResponse> StreamingInputCall(Metadata headers = null, CancellationToken cancellationToken = default(CancellationToken))
+      public global::grpc.testing.SimpleResponse UnaryCall(global::grpc.testing.SimpleRequest request, CallOptions options)
       {
-        var call = CreateCall(__ServiceName, __Method_StreamingInputCall, headers);
-        return Calls.AsyncClientStreamingCall(call, cancellationToken);
+        var call = CreateCall(__Method_UnaryCall, options);
+        return Calls.BlockingUnaryCall(call, request);
       }
-      public AsyncDuplexStreamingCall<global::grpc.testing.StreamingOutputCallRequest, global::grpc.testing.StreamingOutputCallResponse> FullDuplexCall(Metadata headers = null, CancellationToken cancellationToken = default(CancellationToken))
+      public AsyncUnaryCall<global::grpc.testing.SimpleResponse> UnaryCallAsync(global::grpc.testing.SimpleRequest request, Metadata headers = null, DateTime? deadline = null, CancellationToken cancellationToken = default(CancellationToken))
       {
-        var call = CreateCall(__ServiceName, __Method_FullDuplexCall, headers);
-        return Calls.AsyncDuplexStreamingCall(call, cancellationToken);
+        var call = CreateCall(__Method_UnaryCall, new CallOptions(headers, deadline, cancellationToken));
+        return Calls.AsyncUnaryCall(call, request);
       }
-      public AsyncDuplexStreamingCall<global::grpc.testing.StreamingOutputCallRequest, global::grpc.testing.StreamingOutputCallResponse> HalfDuplexCall(Metadata headers = null, CancellationToken cancellationToken = default(CancellationToken))
+      public AsyncUnaryCall<global::grpc.testing.SimpleResponse> UnaryCallAsync(global::grpc.testing.SimpleRequest request, CallOptions options)
       {
-        var call = CreateCall(__ServiceName, __Method_HalfDuplexCall, headers);
-        return Calls.AsyncDuplexStreamingCall(call, cancellationToken);
+        var call = CreateCall(__Method_UnaryCall, options);
+        return Calls.AsyncUnaryCall(call, request);
+      }
+      public AsyncServerStreamingCall<global::grpc.testing.StreamingOutputCallResponse> StreamingOutputCall(global::grpc.testing.StreamingOutputCallRequest request, Metadata headers = null, DateTime? deadline = null, CancellationToken cancellationToken = default(CancellationToken))
+      {
+        var call = CreateCall(__Method_StreamingOutputCall, new CallOptions(headers, deadline, cancellationToken));
+        return Calls.AsyncServerStreamingCall(call, request);
+      }
+      public AsyncServerStreamingCall<global::grpc.testing.StreamingOutputCallResponse> StreamingOutputCall(global::grpc.testing.StreamingOutputCallRequest request, CallOptions options)
+      {
+        var call = CreateCall(__Method_StreamingOutputCall, options);
+        return Calls.AsyncServerStreamingCall(call, request);
+      }
+      public AsyncClientStreamingCall<global::grpc.testing.StreamingInputCallRequest, global::grpc.testing.StreamingInputCallResponse> StreamingInputCall(Metadata headers = null, DateTime? deadline = null, CancellationToken cancellationToken = default(CancellationToken))
+      {
+        var call = CreateCall(__Method_StreamingInputCall, new CallOptions(headers, deadline, cancellationToken));
+        return Calls.AsyncClientStreamingCall(call);
+      }
+      public AsyncClientStreamingCall<global::grpc.testing.StreamingInputCallRequest, global::grpc.testing.StreamingInputCallResponse> StreamingInputCall(CallOptions options)
+      {
+        var call = CreateCall(__Method_StreamingInputCall, options);
+        return Calls.AsyncClientStreamingCall(call);
+      }
+      public AsyncDuplexStreamingCall<global::grpc.testing.StreamingOutputCallRequest, global::grpc.testing.StreamingOutputCallResponse> FullDuplexCall(Metadata headers = null, DateTime? deadline = null, CancellationToken cancellationToken = default(CancellationToken))
+      {
+        var call = CreateCall(__Method_FullDuplexCall, new CallOptions(headers, deadline, cancellationToken));
+        return Calls.AsyncDuplexStreamingCall(call);
+      }
+      public AsyncDuplexStreamingCall<global::grpc.testing.StreamingOutputCallRequest, global::grpc.testing.StreamingOutputCallResponse> FullDuplexCall(CallOptions options)
+      {
+        var call = CreateCall(__Method_FullDuplexCall, options);
+        return Calls.AsyncDuplexStreamingCall(call);
+      }
+      public AsyncDuplexStreamingCall<global::grpc.testing.StreamingOutputCallRequest, global::grpc.testing.StreamingOutputCallResponse> HalfDuplexCall(Metadata headers = null, DateTime? deadline = null, CancellationToken cancellationToken = default(CancellationToken))
+      {
+        var call = CreateCall(__Method_HalfDuplexCall, new CallOptions(headers, deadline, cancellationToken));
+        return Calls.AsyncDuplexStreamingCall(call);
+      }
+      public AsyncDuplexStreamingCall<global::grpc.testing.StreamingOutputCallRequest, global::grpc.testing.StreamingOutputCallResponse> HalfDuplexCall(CallOptions options)
+      {
+        var call = CreateCall(__Method_HalfDuplexCall, options);
+        return Calls.AsyncDuplexStreamingCall(call);
       }
     }
 
diff --git a/src/csharp/Grpc.IntegrationTesting/app.config b/src/csharp/Grpc.IntegrationTesting/app.config
index 966b777192..0a82bb4f16 100644
--- a/src/csharp/Grpc.IntegrationTesting/app.config
+++ b/src/csharp/Grpc.IntegrationTesting/app.config
@@ -4,7 +4,7 @@
     <assemblyBinding xmlns="urn:schemas-microsoft-com:asm.v1">
       <dependentAssembly>
         <assemblyIdentity name="System.Net.Http.Primitives" publicKeyToken="b03f5f7f11d50a3a" culture="neutral" />
-        <bindingRedirect oldVersion="0.0.0.0-4.2.28.0" newVersion="4.2.28.0" />
+        <bindingRedirect oldVersion="0.0.0.0-4.2.29.0" newVersion="4.2.29.0" />
       </dependentAssembly>
       <dependentAssembly>
         <assemblyIdentity name="System.Net.Http" publicKeyToken="b03f5f7f11d50a3a" culture="neutral" />
diff --git a/src/csharp/Grpc.IntegrationTesting/packages.config b/src/csharp/Grpc.IntegrationTesting/packages.config
index c74ac75d79..7d1f84f303 100644
--- a/src/csharp/Grpc.IntegrationTesting/packages.config
+++ b/src/csharp/Grpc.IntegrationTesting/packages.config
@@ -1,14 +1,14 @@
 <?xml version="1.0" encoding="utf-8"?>
 <packages>
-  <package id="Google.Apis.Auth" version="1.9.1" targetFramework="net45" />
-  <package id="Google.Apis.Core" version="1.9.1" targetFramework="net45" />
+  <package id="BouncyCastle" version="1.7.0" targetFramework="net45" />
+  <package id="Google.Apis.Auth" version="1.9.2" targetFramework="net45" />
+  <package id="Google.Apis.Core" version="1.9.2" targetFramework="net45" />
   <package id="Google.ProtocolBuffers" version="2.4.1.521" targetFramework="net45" />
   <package id="Ix-Async" version="1.2.3" targetFramework="net45" />
-  <package id="Microsoft.Bcl" version="1.1.9" targetFramework="net45" />
+  <package id="Microsoft.Bcl" version="1.1.10" targetFramework="net45" />
   <package id="Microsoft.Bcl.Async" version="1.0.168" targetFramework="net45" />
-  <package id="Microsoft.Bcl.Build" version="1.0.14" targetFramework="net45" />
-  <package id="Microsoft.Net.Http" version="2.2.28" targetFramework="net45" />
-  <package id="Newtonsoft.Json" version="6.0.6" targetFramework="net45" />
+  <package id="Microsoft.Bcl.Build" version="1.0.21" targetFramework="net45" />
+  <package id="Microsoft.Net.Http" version="2.2.29" targetFramework="net45" />
+  <package id="Newtonsoft.Json" version="7.0.1" targetFramework="net45" />
   <package id="NUnit" version="2.6.4" targetFramework="net45" />
-  <package id="System.Collections.Immutable" version="1.1.36" targetFramework="net45" />
 </packages>
\ No newline at end of file
diff --git a/src/csharp/Grpc.sln b/src/csharp/Grpc.sln
index 705e4fb1c2..f19f29c6a2 100644
--- a/src/csharp/Grpc.sln
+++ b/src/csharp/Grpc.sln
@@ -34,60 +34,83 @@ Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Grpc.HealthCheck.Tests", "G
 EndProject

 Global

 	GlobalSection(SolutionConfigurationPlatforms) = preSolution

-		Debug|x86 = Debug|x86

-		Release|x86 = Release|x86

+		Debug|Any CPU = Debug|Any CPU

+		Release|Any CPU = Release|Any CPU

+		ReleaseSigned|Any CPU = ReleaseSigned|Any CPU

 	EndGlobalSection

 	GlobalSection(ProjectConfigurationPlatforms) = postSolution

-		{143B1C29-C442-4BE0-BF3F-A8F92288AC9F}.Debug|x86.ActiveCfg = Debug|Any CPU

-		{143B1C29-C442-4BE0-BF3F-A8F92288AC9F}.Debug|x86.Build.0 = Debug|Any CPU

-		{143B1C29-C442-4BE0-BF3F-A8F92288AC9F}.Release|x86.ActiveCfg = Release|Any CPU

-		{143B1C29-C442-4BE0-BF3F-A8F92288AC9F}.Release|x86.Build.0 = Release|Any CPU

-		{3D166931-BA2D-416E-95A3-D36E8F6E90B9}.Debug|x86.ActiveCfg = Debug|x86

-		{3D166931-BA2D-416E-95A3-D36E8F6E90B9}.Debug|x86.Build.0 = Debug|x86

-		{3D166931-BA2D-416E-95A3-D36E8F6E90B9}.Release|x86.ActiveCfg = Release|x86

-		{3D166931-BA2D-416E-95A3-D36E8F6E90B9}.Release|x86.Build.0 = Release|x86

-		{61ECB8EE-0C96-4F8E-B187-8E4D227417C0}.Debug|x86.ActiveCfg = Debug|x86

-		{61ECB8EE-0C96-4F8E-B187-8E4D227417C0}.Debug|x86.Build.0 = Debug|x86

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-		{61ECB8EE-0C96-4F8E-B187-8E4D227417C0}.Release|x86.Build.0 = Release|x86

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-		{7DC1433E-3225-42C7-B7EA-546D56E27A4B}.Release|x86.Build.0 = Release|Any CPU

-		{86EC5CB4-4EA2-40A2-8057-86542A0353BB}.Debug|x86.ActiveCfg = Debug|Any CPU

-		{86EC5CB4-4EA2-40A2-8057-86542A0353BB}.Debug|x86.Build.0 = Debug|Any CPU

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-	EndGlobalSection

-	GlobalSection(NestedProjects) = preSolution

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+		{CCC4440E-49F7-4790-B0AF-FEABB0837AE7}.Debug|Any CPU.ActiveCfg = Debug|Any CPU

+		{CCC4440E-49F7-4790-B0AF-FEABB0837AE7}.Debug|Any CPU.Build.0 = Debug|Any CPU

+		{CCC4440E-49F7-4790-B0AF-FEABB0837AE7}.Release|Any CPU.ActiveCfg = Release|Any CPU

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+		{CCC4440E-49F7-4790-B0AF-FEABB0837AE7}.ReleaseSigned|Any CPU.ActiveCfg = ReleaseSigned|Any CPU

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+		{86EC5CB4-4EA2-40A2-8057-86542A0353BB}.Debug|Any CPU.ActiveCfg = Debug|Any CPU

+		{86EC5CB4-4EA2-40A2-8057-86542A0353BB}.Debug|Any CPU.Build.0 = Debug|Any CPU

+		{86EC5CB4-4EA2-40A2-8057-86542A0353BB}.Release|Any CPU.ActiveCfg = Release|Any CPU

+		{86EC5CB4-4EA2-40A2-8057-86542A0353BB}.Release|Any CPU.Build.0 = Release|Any CPU

+		{86EC5CB4-4EA2-40A2-8057-86542A0353BB}.ReleaseSigned|Any CPU.ActiveCfg = ReleaseSigned|Any CPU

+		{86EC5CB4-4EA2-40A2-8057-86542A0353BB}.ReleaseSigned|Any CPU.Build.0 = ReleaseSigned|Any CPU

+		{143B1C29-C442-4BE0-BF3F-A8F92288AC9F}.Debug|Any CPU.ActiveCfg = Debug|Any CPU

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+		{61ECB8EE-0C96-4F8E-B187-8E4D227417C0}.ReleaseSigned|Any CPU.Build.0 = ReleaseSigned|Any CPU

+		{C61154BA-DD4A-4838-8420-0162A28925E0}.Debug|Any CPU.ActiveCfg = Debug|Any CPU

+		{C61154BA-DD4A-4838-8420-0162A28925E0}.Debug|Any CPU.Build.0 = Debug|Any CPU

+		{C61154BA-DD4A-4838-8420-0162A28925E0}.Release|Any CPU.ActiveCfg = Release|Any CPU

+		{C61154BA-DD4A-4838-8420-0162A28925E0}.Release|Any CPU.Build.0 = Release|Any CPU

+		{C61154BA-DD4A-4838-8420-0162A28925E0}.ReleaseSigned|Any CPU.ActiveCfg = ReleaseSigned|Any CPU

+		{C61154BA-DD4A-4838-8420-0162A28925E0}.ReleaseSigned|Any CPU.Build.0 = ReleaseSigned|Any CPU

+		{3D166931-BA2D-416E-95A3-D36E8F6E90B9}.Debug|Any CPU.ActiveCfg = Debug|Any CPU

+		{3D166931-BA2D-416E-95A3-D36E8F6E90B9}.Debug|Any CPU.Build.0 = Debug|Any CPU

+		{3D166931-BA2D-416E-95A3-D36E8F6E90B9}.Release|Any CPU.ActiveCfg = Release|Any CPU

+		{3D166931-BA2D-416E-95A3-D36E8F6E90B9}.Release|Any CPU.Build.0 = Release|Any CPU

+		{3D166931-BA2D-416E-95A3-D36E8F6E90B9}.ReleaseSigned|Any CPU.ActiveCfg = ReleaseSigned|Any CPU

+		{3D166931-BA2D-416E-95A3-D36E8F6E90B9}.ReleaseSigned|Any CPU.Build.0 = ReleaseSigned|Any CPU

+		{A654F3B8-E859-4E6A-B30D-227527DBEF0D}.Debug|Any CPU.ActiveCfg = Debug|Any CPU

+		{A654F3B8-E859-4E6A-B30D-227527DBEF0D}.Debug|Any CPU.Build.0 = Debug|Any CPU

+		{A654F3B8-E859-4E6A-B30D-227527DBEF0D}.Release|Any CPU.ActiveCfg = Release|Any CPU

+		{A654F3B8-E859-4E6A-B30D-227527DBEF0D}.Release|Any CPU.Build.0 = Release|Any CPU

+		{A654F3B8-E859-4E6A-B30D-227527DBEF0D}.ReleaseSigned|Any CPU.ActiveCfg = ReleaseSigned|Any CPU

+		{A654F3B8-E859-4E6A-B30D-227527DBEF0D}.ReleaseSigned|Any CPU.Build.0 = ReleaseSigned|Any CPU

+		{BF62FE08-373A-43D6-9D73-41CAA38B7011}.Debug|Any CPU.ActiveCfg = Debug|Any CPU

+		{BF62FE08-373A-43D6-9D73-41CAA38B7011}.Debug|Any CPU.Build.0 = Debug|Any CPU

+		{BF62FE08-373A-43D6-9D73-41CAA38B7011}.Release|Any CPU.ActiveCfg = Release|Any CPU

+		{BF62FE08-373A-43D6-9D73-41CAA38B7011}.Release|Any CPU.Build.0 = Release|Any CPU

+		{BF62FE08-373A-43D6-9D73-41CAA38B7011}.ReleaseSigned|Any CPU.ActiveCfg = ReleaseSigned|Any CPU

+		{BF62FE08-373A-43D6-9D73-41CAA38B7011}.ReleaseSigned|Any CPU.Build.0 = ReleaseSigned|Any CPU

+		{AE21D0EE-9A2C-4C15-AB7F-5224EED5B0EA}.Debug|Any CPU.ActiveCfg = Debug|Any CPU

+		{AE21D0EE-9A2C-4C15-AB7F-5224EED5B0EA}.Debug|Any CPU.Build.0 = Debug|Any CPU

+		{AE21D0EE-9A2C-4C15-AB7F-5224EED5B0EA}.Release|Any CPU.ActiveCfg = Release|Any CPU

+		{AE21D0EE-9A2C-4C15-AB7F-5224EED5B0EA}.Release|Any CPU.Build.0 = Release|Any CPU

+		{AE21D0EE-9A2C-4C15-AB7F-5224EED5B0EA}.ReleaseSigned|Any CPU.ActiveCfg = ReleaseSigned|Any CPU

+		{AE21D0EE-9A2C-4C15-AB7F-5224EED5B0EA}.ReleaseSigned|Any CPU.Build.0 = ReleaseSigned|Any CPU

+		{AA5E328A-8835-49D7-98ED-C29F2B3049F0}.Debug|Any CPU.ActiveCfg = Debug|Any CPU

+		{AA5E328A-8835-49D7-98ED-C29F2B3049F0}.Debug|Any CPU.Build.0 = Debug|Any CPU

+		{AA5E328A-8835-49D7-98ED-C29F2B3049F0}.Release|Any CPU.ActiveCfg = Release|Any CPU

+		{AA5E328A-8835-49D7-98ED-C29F2B3049F0}.Release|Any CPU.Build.0 = Release|Any CPU

+		{AA5E328A-8835-49D7-98ED-C29F2B3049F0}.ReleaseSigned|Any CPU.ActiveCfg = ReleaseSigned|Any CPU

+		{AA5E328A-8835-49D7-98ED-C29F2B3049F0}.ReleaseSigned|Any CPU.Build.0 = ReleaseSigned|Any CPU

+		{F8C6D937-C44B-4EE3-A431-B0FBAEACE47D}.Debug|Any CPU.ActiveCfg = Debug|Any CPU

+		{F8C6D937-C44B-4EE3-A431-B0FBAEACE47D}.Debug|Any CPU.Build.0 = Debug|Any CPU

+		{F8C6D937-C44B-4EE3-A431-B0FBAEACE47D}.Release|Any CPU.ActiveCfg = Release|Any CPU

+		{F8C6D937-C44B-4EE3-A431-B0FBAEACE47D}.Release|Any CPU.Build.0 = Release|Any CPU

+		{F8C6D937-C44B-4EE3-A431-B0FBAEACE47D}.ReleaseSigned|Any CPU.ActiveCfg = ReleaseSigned|Any CPU

+		{F8C6D937-C44B-4EE3-A431-B0FBAEACE47D}.ReleaseSigned|Any CPU.Build.0 = ReleaseSigned|Any CPU

 	EndGlobalSection

 	GlobalSection(SolutionProperties) = preSolution

 		HideSolutionNode = FALSE

diff --git a/src/csharp/build_packages.bat b/src/csharp/build_packages.bat
index c3e5fe8817..9e1253bf0b 100644
--- a/src/csharp/build_packages.bat
+++ b/src/csharp/build_packages.bat
@@ -12,7 +12,7 @@ cd ..\..\vsprojects\nuget_package
 @call buildall.bat || goto :error
 endlocal
 
-@call buildall.bat || goto :error
+@call buildall.bat BUILD_SIGNED || goto :error
 
 %NUGET% pack ..\..\vsprojects\nuget_package\grpc.native.csharp_ext.nuspec -Version %CORE_VERSION% || goto :error
 %NUGET% pack Grpc.Auth\Grpc.Auth.nuspec -Symbols -Version %VERSION% || goto :error
diff --git a/src/csharp/buildall.bat b/src/csharp/buildall.bat
index 16860aec3c..d85896c255 100644
--- a/src/csharp/buildall.bat
+++ b/src/csharp/buildall.bat
@@ -9,10 +9,15 @@ cd /d %~dp0
 @call "%VS120COMNTOOLS%\..\..\vc\vcvarsall.bat" x86
 
 @rem Build the C# native extension
-msbuild ..\..\vsprojects\grpc.sln /t:grpc_csharp_ext /p:PlatformToolset=v120 || goto :error
+msbuild ..\..\vsprojects\grpc_csharp_ext.sln /p:PlatformToolset=v120 || goto :error
 
 msbuild Grpc.sln /p:Configuration=Debug || goto :error
 msbuild Grpc.sln /p:Configuration=Release || goto :error
+
+if "%1" == "BUILD_SIGNED" (
+msbuild Grpc.sln /p:Configuration=ReleaseSigned || goto :error
+)
+
 endlocal
 
 goto :EOF
diff --git a/src/csharp/ext/grpc_csharp_ext.c b/src/csharp/ext/grpc_csharp_ext.c
index 682521446f..048887bc12 100644
--- a/src/csharp/ext/grpc_csharp_ext.c
+++ b/src/csharp/ext/grpc_csharp_ext.c
@@ -169,7 +169,7 @@ grpcsharp_metadata_array_add(grpc_metadata_array *array, const char *key,
 
 GPR_EXPORT gpr_intptr GPR_CALLTYPE
 grpcsharp_metadata_array_count(grpc_metadata_array *array) {
-  return (gpr_intptr) array->count;
+  return (gpr_intptr)array->count;
 }
 
 GPR_EXPORT const char *GPR_CALLTYPE
@@ -184,10 +184,10 @@ grpcsharp_metadata_array_get_value(grpc_metadata_array *array, size_t index) {
   return array->metadata[index].value;
 }
 
-GPR_EXPORT gpr_intptr GPR_CALLTYPE
-grpcsharp_metadata_array_get_value_length(grpc_metadata_array *array, size_t index) {
+GPR_EXPORT gpr_intptr GPR_CALLTYPE grpcsharp_metadata_array_get_value_length(
+    grpc_metadata_array *array, size_t index) {
   GPR_ASSERT(index < array->count);
-  return (gpr_intptr) array->metadata[index].value_length;
+  return (gpr_intptr)array->metadata[index].value_length;
 }
 
 /* Move contents of metadata array */
@@ -306,8 +306,7 @@ grpcsharp_batch_context_server_rpc_new_method(
   return ctx->server_rpc_new.call_details.method;
 }
 
-GPR_EXPORT const char *GPR_CALLTYPE
-grpcsharp_batch_context_server_rpc_new_host(
+GPR_EXPORT const char *GPR_CALLTYPE grpcsharp_batch_context_server_rpc_new_host(
     const grpcsharp_batch_context *ctx) {
   return ctx->server_rpc_new.call_details.host;
 }
@@ -367,8 +366,9 @@ grpcsharp_completion_queue_pluck(grpc_completion_queue *cq, void *tag) {
 /* Channel */
 
 GPR_EXPORT grpc_channel *GPR_CALLTYPE
-grpcsharp_channel_create(const char *target, const grpc_channel_args *args) {
-  return grpc_channel_create(target, args);
+
+grpcsharp_insecure_channel_create(const char *target, const grpc_channel_args *args) {
+  return grpc_insecure_channel_create(target, args);
 }
 
 GPR_EXPORT void GPR_CALLTYPE grpcsharp_channel_destroy(grpc_channel *channel) {
@@ -379,7 +379,24 @@ GPR_EXPORT grpc_call *GPR_CALLTYPE
 grpcsharp_channel_create_call(grpc_channel *channel, grpc_completion_queue *cq,
                               const char *method, const char *host,
                               gpr_timespec deadline) {
-  return grpc_channel_create_call(channel, cq, method, host, deadline);
+  return grpc_channel_create_call(channel, NULL, GRPC_PROPAGATE_DEFAULTS, cq,
+                                  method, host, deadline);
+}
+
+GPR_EXPORT grpc_connectivity_state GPR_CALLTYPE
+grpcsharp_channel_check_connectivity_state(grpc_channel *channel, gpr_int32 try_to_connect) {
+  return grpc_channel_check_connectivity_state(channel, try_to_connect);
+}
+
+GPR_EXPORT void GPR_CALLTYPE grpcsharp_channel_watch_connectivity_state(
+    grpc_channel *channel, grpc_connectivity_state last_observed_state,
+    gpr_timespec deadline, grpc_completion_queue *cq, grpcsharp_batch_context *ctx) {
+  grpc_channel_watch_connectivity_state(channel, last_observed_state,
+                                        deadline, cq, ctx);
+}
+
+GPR_EXPORT char *GPR_CALLTYPE grpcsharp_channel_get_target(grpc_channel *channel) {
+  return grpc_channel_get_target(channel);
 }
 
 /* Channel args */
@@ -433,10 +450,20 @@ grpcsharp_channel_args_destroy(grpc_channel_args *args) {
 
 /* Timespec */
 
-GPR_EXPORT gpr_timespec GPR_CALLTYPE gprsharp_now(void) { return gpr_now(GPR_CLOCK_REALTIME); }
+GPR_EXPORT gpr_timespec GPR_CALLTYPE gprsharp_now(gpr_clock_type clock_type) {
+  return gpr_now(clock_type);
+}
 
-GPR_EXPORT gpr_timespec GPR_CALLTYPE gprsharp_inf_future(void) {
-  return gpr_inf_future(GPR_CLOCK_REALTIME);
+GPR_EXPORT gpr_timespec GPR_CALLTYPE gprsharp_inf_future(gpr_clock_type clock_type) {
+  return gpr_inf_future(clock_type);
+}
+
+GPR_EXPORT gpr_timespec GPR_CALLTYPE gprsharp_inf_past(gpr_clock_type clock_type) {
+  return gpr_inf_past(clock_type);
+}
+
+GPR_EXPORT gpr_timespec GPR_CALLTYPE gprsharp_convert_clock_type(gpr_timespec t, gpr_clock_type target_clock) {
+  return gpr_convert_clock_type(t, target_clock);
 }
 
 GPR_EXPORT gpr_int32 GPR_CALLTYPE gprsharp_sizeof_timespec(void) {
@@ -455,6 +482,14 @@ grpcsharp_call_cancel_with_status(grpc_call *call, grpc_status_code status,
   return grpc_call_cancel_with_status(call, status, description);
 }
 
+GPR_EXPORT char *GPR_CALLTYPE grpcsharp_call_get_peer(grpc_call *call) {
+  return grpc_call_get_peer(call);
+}
+
+GPR_EXPORT void GPR_CALLTYPE gprsharp_free(void *p) {
+  gpr_free(p);
+}
+
 GPR_EXPORT void GPR_CALLTYPE grpcsharp_call_destroy(grpc_call *call) {
   grpc_call_destroy(call);
 }
@@ -638,20 +673,17 @@ grpcsharp_call_send_close_from_client(grpc_call *call,
   return grpc_call_start_batch(call, ops, sizeof(ops) / sizeof(ops[0]), ctx);
 }
 
-GPR_EXPORT grpc_call_error GPR_CALLTYPE
-grpcsharp_call_send_status_from_server(grpc_call *call,
-                                       grpcsharp_batch_context *ctx,
-                                       grpc_status_code status_code,
-                                       const char *status_details,
-                                       grpc_metadata_array *trailing_metadata) {
+GPR_EXPORT grpc_call_error GPR_CALLTYPE grpcsharp_call_send_status_from_server(
+    grpc_call *call, grpcsharp_batch_context *ctx, grpc_status_code status_code,
+    const char *status_details, grpc_metadata_array *trailing_metadata) {
   /* TODO: don't use magic number */
   grpc_op ops[1];
   ops[0].op = GRPC_OP_SEND_STATUS_FROM_SERVER;
   ops[0].data.send_status_from_server.status = status_code;
   ops[0].data.send_status_from_server.status_details =
       gpr_strdup(status_details);
-  grpcsharp_metadata_array_move(&(ctx->send_status_from_server.trailing_metadata),
-                                  trailing_metadata);
+  grpcsharp_metadata_array_move(
+      &(ctx->send_status_from_server.trailing_metadata), trailing_metadata);
   ops[0].data.send_status_from_server.trailing_metadata_count =
       ctx->send_status_from_server.trailing_metadata.count;
   ops[0].data.send_status_from_server.trailing_metadata =
@@ -699,8 +731,8 @@ grpcsharp_server_create(grpc_completion_queue *cq,
 }
 
 GPR_EXPORT gpr_int32 GPR_CALLTYPE
-grpcsharp_server_add_http2_port(grpc_server *server, const char *addr) {
-  return grpc_server_add_http2_port(server, addr);
+grpcsharp_server_add_insecure_http2_port(grpc_server *server, const char *addr) {
+  return grpc_server_add_insecure_http2_port(server, addr);
 }
 
 GPR_EXPORT void GPR_CALLTYPE grpcsharp_server_start(grpc_server *server) {
@@ -761,7 +793,8 @@ grpcsharp_secure_channel_create(grpc_credentials *creds, const char *target,
 GPR_EXPORT grpc_server_credentials *GPR_CALLTYPE
 grpcsharp_ssl_server_credentials_create(
     const char *pem_root_certs, const char **key_cert_pair_cert_chain_array,
-    const char **key_cert_pair_private_key_array, size_t num_key_cert_pairs) {
+    const char **key_cert_pair_private_key_array, size_t num_key_cert_pairs,
+    int force_client_auth) {
   size_t i;
   grpc_server_credentials *creds;
   grpc_ssl_pem_key_cert_pair *key_cert_pairs =
@@ -777,7 +810,8 @@ grpcsharp_ssl_server_credentials_create(
     }
   }
   creds = grpc_ssl_server_credentials_create(pem_root_certs, key_cert_pairs,
-                                             num_key_cert_pairs);
+                                             num_key_cert_pairs,
+                                             force_client_auth);
   gpr_free(key_cert_pairs);
   return creds;
 }
diff --git a/src/csharp/keys/Grpc.public.snk b/src/csharp/keys/Grpc.public.snk
new file mode 100644
index 0000000000..bac3046b36
--- /dev/null
+++ b/src/csharp/keys/Grpc.public.snk
diff --git a/src/csharp/keys/README.md b/src/csharp/keys/README.md
new file mode 100644
index 0000000000..f3e9a3cb56
--- /dev/null
+++ b/src/csharp/keys/README.md
@@ -0,0 +1,5 @@
+Contents
+--------
+
+- Grpc.public.snk:
+  Public key to verify strong name of gRPC assemblies.
\ No newline at end of file
diff --git a/src/node/README.md b/src/node/README.md
index 78781dab14..7d3d8c7fa1 100644
--- a/src/node/README.md
+++ b/src/node/README.md
@@ -85,7 +85,7 @@ An object with factory methods for creating credential objects for clients.
 ServerCredentials
 ```
 
-An object with factory methods fro creating credential objects for servers.
+An object with factory methods for creating credential objects for servers.
 
 [homebrew]:http://brew.sh
 [linuxbrew]:https://github.com/Homebrew/linuxbrew#installation
diff --git a/src/node/examples/math_server.js b/src/node/examples/math_server.js
index b1f8a6323f..31892c65df 100644
--- a/src/node/examples/math_server.js
+++ b/src/node/examples/math_server.js
@@ -115,7 +115,7 @@ server.addProtoService(math.Math.service, {
 });
 
 if (require.main === module) {
-  server.bind('0.0.0.0:50051');
+  server.bind('0.0.0.0:50051', grpc.ServerCredentials.createInsecure());
   server.start();
 }
 
diff --git a/src/node/examples/perf_test.js b/src/node/examples/perf_test.js
index da919eced5..0f38725f72 100644
--- a/src/node/examples/perf_test.js
+++ b/src/node/examples/perf_test.js
@@ -41,7 +41,8 @@ var interop_server = require('../interop/interop_server.js');
 function runTest(iterations, callback) {
   var testServer = interop_server.getServer(0, false);
   testServer.server.listen();
-  var client = new testProto.TestService('localhost:' + testServer.port);
+  var client = new testProto.TestService('localhost:' + testServer.port,
+                                         grpc.Credentials.createInsecure());
 
   function runIterations(finish) {
     var start = process.hrtime();
diff --git a/src/node/examples/qps_test.js b/src/node/examples/qps_test.js
index 00293b464a..1ce4dbe070 100644
--- a/src/node/examples/qps_test.js
+++ b/src/node/examples/qps_test.js
@@ -61,7 +61,8 @@ var interop_server = require('../interop/interop_server.js');
 function runTest(concurrent_calls, seconds, callback) {
   var testServer = interop_server.getServer(0, false);
   testServer.server.listen();
-  var client = new testProto.TestService('localhost:' + testServer.port);
+  var client = new testProto.TestService('localhost:' + testServer.port,
+                                         grpc.Credentials.createInsecure());
 
   var warmup_num = 100;
 
diff --git a/src/node/examples/route_guide_client.js b/src/node/examples/route_guide_client.js
index 8cd532fef1..647f3ffaba 100644
--- a/src/node/examples/route_guide_client.js
+++ b/src/node/examples/route_guide_client.js
@@ -40,7 +40,8 @@ var path = require('path');
 var _ = require('lodash');
 var grpc = require('..');
 var examples = grpc.load(__dirname + '/route_guide.proto').examples;
-var client = new examples.RouteGuide('localhost:50051');
+var client = new examples.RouteGuide('localhost:50051',
+                                     grpc.Credentials.createInsecure());
 
 var COORD_FACTOR = 1e7;
 
diff --git a/src/node/examples/route_guide_server.js b/src/node/examples/route_guide_server.js
index 70044a322c..bb8e79b5bd 100644
--- a/src/node/examples/route_guide_server.js
+++ b/src/node/examples/route_guide_server.js
@@ -239,7 +239,7 @@ function getServer() {
 if (require.main === module) {
   // If this is run as a script, start a server on an unused port
   var routeServer = getServer();
-  routeServer.bind('0.0.0.0:50051');
+  routeServer.bind('0.0.0.0:50051', grpc.ServerCredentials.createInsecure());
   var argv = parseArgs(process.argv, {
     string: 'db_path'
   });
diff --git a/src/node/examples/stock_client.js b/src/node/examples/stock_client.js
index b37e66df07..ab9b050e9b 100644
--- a/src/node/examples/stock_client.js
+++ b/src/node/examples/stock_client.js
@@ -38,7 +38,8 @@ var examples = grpc.load(__dirname + '/stock.proto').examples;
  * This exports a client constructor for the Stock service. The usage looks like
  *
  * var StockClient = require('stock_client.js');
- * var stockClient = new StockClient(server_address);
+ * var stockClient = new StockClient(server_address,
+ *                                   grpc.Credentials.createInsecure());
  * stockClient.getLastTradePrice({symbol: 'GOOG'}, function(error, response) {
  *   console.log(error || response);
  * });
diff --git a/src/node/examples/stock_server.js b/src/node/examples/stock_server.js
index f2eb6ad4ab..dfcfe30eb4 100644
--- a/src/node/examples/stock_server.js
+++ b/src/node/examples/stock_server.js
@@ -80,7 +80,7 @@ stockServer.addProtoService(examples.Stock.service, {
 });
 
 if (require.main === module) {
-  stockServer.bind('0.0.0.0:50051');
+  stockServer.bind('0.0.0.0:50051', grpc.ServerCredentials.createInsecure());
   stockServer.listen();
 }
 
diff --git a/src/node/ext/call.cc b/src/node/ext/call.cc
index 15c9b2d97d..fe585a0d4f 100644
--- a/src/node/ext/call.cc
+++ b/src/node/ext/call.cc
@@ -192,7 +192,7 @@ class SendMetadataOp : public Op {
   }
  protected:
   std::string GetTypeString() const {
-    return "send metadata";
+    return "send_metadata";
   }
 };
 
@@ -216,7 +216,7 @@ class SendMessageOp : public Op {
   }
  protected:
   std::string GetTypeString() const {
-    return "send message";
+    return "send_message";
   }
 };
 
@@ -232,7 +232,7 @@ class SendClientCloseOp : public Op {
   }
  protected:
   std::string GetTypeString() const {
-    return "client close";
+    return "client_close";
   }
 };
 
@@ -276,7 +276,7 @@ class SendServerStatusOp : public Op {
   }
  protected:
   std::string GetTypeString() const {
-    return "send status";
+    return "send_status";
   }
 };
 
@@ -453,6 +453,8 @@ void Call::Init(Handle<Object> exports) {
                           NanNew<FunctionTemplate>(StartBatch)->GetFunction());
   NanSetPrototypeTemplate(tpl, "cancel",
                           NanNew<FunctionTemplate>(Cancel)->GetFunction());
+  NanSetPrototypeTemplate(tpl, "getPeer",
+                          NanNew<FunctionTemplate>(GetPeer)->GetFunction());
   NanAssignPersistent(fun_tpl, tpl);
   Handle<Function> ctr = tpl->GetFunction();
   ctr->Set(NanNew("WRITE_BUFFER_HINT"),
@@ -509,8 +511,9 @@ NAN_METHOD(Call::New) {
       double deadline = args[2]->NumberValue();
       grpc_channel *wrapped_channel = channel->GetWrappedChannel();
       grpc_call *wrapped_call = grpc_channel_create_call(
-          wrapped_channel, CompletionQueueAsyncWorker::GetQueue(), *method,
-          channel->GetHost(), MillisecondsToTimespec(deadline));
+          wrapped_channel, NULL, GRPC_PROPAGATE_DEFAULTS,
+          CompletionQueueAsyncWorker::GetQueue(), *method, channel->GetHost(),
+          MillisecondsToTimespec(deadline));
       call = new Call(wrapped_call);
       args.This()->SetHiddenValue(NanNew("channel_"), channel_object);
     }
@@ -608,5 +611,17 @@ NAN_METHOD(Call::Cancel) {
   NanReturnUndefined();
 }
 
+NAN_METHOD(Call::GetPeer) {
+  NanScope();
+  if (!HasInstance(args.This())) {
+    return NanThrowTypeError("getPeer can only be called on Call objects");
+  }
+  Call *call = ObjectWrap::Unwrap<Call>(args.This());
+  char *peer = grpc_call_get_peer(call->wrapped_call);
+  Handle<Value> peer_value = NanNew(peer);
+  gpr_free(peer);
+  NanReturnValue(peer_value);
+}
+
 }  // namespace node
 }  // namespace grpc
diff --git a/src/node/ext/call.h b/src/node/ext/call.h
index 43142c7091..6acda76197 100644
--- a/src/node/ext/call.h
+++ b/src/node/ext/call.h
@@ -120,6 +120,7 @@ class Call : public ::node::ObjectWrap {
   static NAN_METHOD(New);
   static NAN_METHOD(StartBatch);
   static NAN_METHOD(Cancel);
+  static NAN_METHOD(GetPeer);
   static NanCallback *constructor;
   // Used for typechecking instances of this javascript class
   static v8::Persistent<v8::FunctionTemplate> fun_tpl;
diff --git a/src/node/ext/channel.cc b/src/node/ext/channel.cc
index d37bf763dd..d02ed95672 100644
--- a/src/node/ext/channel.cc
+++ b/src/node/ext/channel.cc
@@ -76,6 +76,8 @@ void Channel::Init(Handle<Object> exports) {
   tpl->InstanceTemplate()->SetInternalFieldCount(1);
   NanSetPrototypeTemplate(tpl, "close",
                           NanNew<FunctionTemplate>(Close)->GetFunction());
+  NanSetPrototypeTemplate(tpl, "getTarget",
+                          NanNew<FunctionTemplate>(GetTarget)->GetFunction());
   NanAssignPersistent(fun_tpl, tpl);
   Handle<Function> ctr = tpl->GetFunction();
   constructor = new NanCallback(ctr);
@@ -96,31 +98,30 @@ NAN_METHOD(Channel::New) {
 
   if (args.IsConstructCall()) {
     if (!args[0]->IsString()) {
-      return NanThrowTypeError("Channel expects a string and an object");
+      return NanThrowTypeError(
+          "Channel expects a string, a credential and an object");
     }
     grpc_channel *wrapped_channel;
     // Owned by the Channel object
     NanUtf8String *host = new NanUtf8String(args[0]);
     NanUtf8String *host_override = NULL;
-    if (args[1]->IsUndefined()) {
-      wrapped_channel = grpc_channel_create(**host, NULL);
-    } else if (args[1]->IsObject()) {
-      grpc_credentials *creds = NULL;
-      Handle<Object> args_hash(args[1]->ToObject()->Clone());
+    grpc_credentials *creds;
+    if (!Credentials::HasInstance(args[1])) {
+      return NanThrowTypeError(
+          "Channel's second argument must be a credential");
+    }
+    Credentials *creds_object = ObjectWrap::Unwrap<Credentials>(
+        args[1]->ToObject());
+    creds = creds_object->GetWrappedCredentials();
+    grpc_channel_args *channel_args_ptr;
+    if (args[2]->IsUndefined()) {
+      channel_args_ptr = NULL;
+      wrapped_channel = grpc_insecure_channel_create(**host, NULL);
+    } else if (args[2]->IsObject()) {
+      Handle<Object> args_hash(args[2]->ToObject()->Clone());
       if (args_hash->HasOwnProperty(NanNew(GRPC_SSL_TARGET_NAME_OVERRIDE_ARG))) {
         host_override = new NanUtf8String(args_hash->Get(NanNew(GRPC_SSL_TARGET_NAME_OVERRIDE_ARG)));
       }
-      if (args_hash->HasOwnProperty(NanNew("credentials"))) {
-        Handle<Value> creds_value = args_hash->Get(NanNew("credentials"));
-        if (!Credentials::HasInstance(creds_value)) {
-          return NanThrowTypeError(
-              "credentials arg must be a Credentials object");
-        }
-        Credentials *creds_object =
-            ObjectWrap::Unwrap<Credentials>(creds_value->ToObject());
-        creds = creds_object->GetWrappedCredentials();
-        args_hash->Delete(NanNew("credentials"));
-      }
       Handle<Array> keys(args_hash->GetOwnPropertyNames());
       grpc_channel_args channel_args;
       channel_args.num_args = keys->Length();
@@ -147,16 +148,19 @@ NAN_METHOD(Channel::New) {
           return NanThrowTypeError("Arg values must be strings");
         }
       }
-      if (creds == NULL) {
-        wrapped_channel = grpc_channel_create(**host, &channel_args);
-      } else {
-        wrapped_channel =
-            grpc_secure_channel_create(creds, **host, &channel_args);
-      }
-      free(channel_args.args);
+      channel_args_ptr = &channel_args;
     } else {
       return NanThrowTypeError("Channel expects a string and an object");
     }
+    if (creds == NULL) {
+      wrapped_channel = grpc_insecure_channel_create(**host, channel_args_ptr);
+    } else {
+      wrapped_channel =
+          grpc_secure_channel_create(creds, **host, channel_args_ptr);
+    }
+    if (channel_args_ptr != NULL) {
+      free(channel_args_ptr->args);
+    }
     Channel *channel;
     if (host_override == NULL) {
       channel = new Channel(wrapped_channel, host);
@@ -166,8 +170,8 @@ NAN_METHOD(Channel::New) {
     channel->Wrap(args.This());
     NanReturnValue(args.This());
   } else {
-    const int argc = 2;
-    Local<Value> argv[argc] = {args[0], args[1]};
+    const int argc = 3;
+    Local<Value> argv[argc] = {args[0], args[1], args[2]};
     NanReturnValue(constructor->GetFunction()->NewInstance(argc, argv));
   }
 }
@@ -185,5 +189,14 @@ NAN_METHOD(Channel::Close) {
   NanReturnUndefined();
 }
 
+NAN_METHOD(Channel::GetTarget) {
+  NanScope();
+  if (!HasInstance(args.This())) {
+    return NanThrowTypeError("getTarget can only be called on Channel objects");
+  }
+  Channel *channel = ObjectWrap::Unwrap<Channel>(args.This());
+  NanReturnValue(NanNew(grpc_channel_get_target(channel->wrapped_channel)));
+}
+
 }  // namespace node
 }  // namespace grpc
diff --git a/src/node/ext/channel.h b/src/node/ext/channel.h
index b3aa0f700f..6725ebb03f 100644
--- a/src/node/ext/channel.h
+++ b/src/node/ext/channel.h
@@ -66,6 +66,7 @@ class Channel : public ::node::ObjectWrap {
 
   static NAN_METHOD(New);
   static NAN_METHOD(Close);
+  static NAN_METHOD(GetTarget);
   static NanCallback *constructor;
   static v8::Persistent<v8::FunctionTemplate> fun_tpl;
 
diff --git a/src/node/ext/credentials.cc b/src/node/ext/credentials.cc
index 34872017ea..21d61f1a7f 100644
--- a/src/node/ext/credentials.cc
+++ b/src/node/ext/credentials.cc
@@ -79,10 +79,10 @@ void Credentials::Init(Handle<Object> exports) {
            NanNew<FunctionTemplate>(CreateComposite)->GetFunction());
   ctr->Set(NanNew("createGce"),
            NanNew<FunctionTemplate>(CreateGce)->GetFunction());
-  ctr->Set(NanNew("createFake"),
-           NanNew<FunctionTemplate>(CreateFake)->GetFunction());
   ctr->Set(NanNew("createIam"),
            NanNew<FunctionTemplate>(CreateIam)->GetFunction());
+  ctr->Set(NanNew("createInsecure"),
+           NanNew<FunctionTemplate>(CreateInsecure)->GetFunction());
   constructor = new NanCallback(ctr);
   exports->Set(NanNew("Credentials"), ctr);
 }
@@ -94,9 +94,6 @@ bool Credentials::HasInstance(Handle<Value> val) {
 
 Handle<Value> Credentials::WrapStruct(grpc_credentials *credentials) {
   NanEscapableScope();
-  if (credentials == NULL) {
-    return NanEscapeScope(NanNull());
-  }
   const int argc = 1;
   Handle<Value> argv[argc] = {
     NanNew<External>(reinterpret_cast<void *>(credentials))};
@@ -130,7 +127,11 @@ NAN_METHOD(Credentials::New) {
 
 NAN_METHOD(Credentials::CreateDefault) {
   NanScope();
-  NanReturnValue(WrapStruct(grpc_google_default_credentials_create()));
+  grpc_credentials *creds = grpc_google_default_credentials_create();
+  if (creds == NULL) {
+    NanReturnNull();
+  }
+  NanReturnValue(WrapStruct(creds));
 }
 
 NAN_METHOD(Credentials::CreateSsl) {
@@ -154,9 +155,12 @@ NAN_METHOD(Credentials::CreateSsl) {
     return NanThrowTypeError(
         "createSSl's third argument must be a Buffer if provided");
   }
-
-  NanReturnValue(WrapStruct(grpc_ssl_credentials_create(
-      root_certs, key_cert_pair.private_key == NULL ? NULL : &key_cert_pair)));
+  grpc_credentials *creds = grpc_ssl_credentials_create(
+      root_certs, key_cert_pair.private_key == NULL ? NULL : &key_cert_pair);
+  if (creds == NULL) {
+    NanReturnNull();
+  }
+  NanReturnValue(WrapStruct(creds));
 }
 
 NAN_METHOD(Credentials::CreateComposite) {
@@ -171,18 +175,21 @@ NAN_METHOD(Credentials::CreateComposite) {
   }
   Credentials *creds1 = ObjectWrap::Unwrap<Credentials>(args[0]->ToObject());
   Credentials *creds2 = ObjectWrap::Unwrap<Credentials>(args[1]->ToObject());
-  NanReturnValue(WrapStruct(grpc_composite_credentials_create(
-      creds1->wrapped_credentials, creds2->wrapped_credentials)));
+  grpc_credentials *creds = grpc_composite_credentials_create(
+      creds1->wrapped_credentials, creds2->wrapped_credentials);
+  if (creds == NULL) {
+    NanReturnNull();
+  }
+  NanReturnValue(WrapStruct(creds));
 }
 
 NAN_METHOD(Credentials::CreateGce) {
   NanScope();
-  NanReturnValue(WrapStruct(grpc_compute_engine_credentials_create()));
-}
-
-NAN_METHOD(Credentials::CreateFake) {
-  NanScope();
-  NanReturnValue(WrapStruct(grpc_fake_transport_security_credentials_create()));
+  grpc_credentials *creds = grpc_compute_engine_credentials_create();
+  if (creds == NULL) {
+    NanReturnNull();
+  }
+  NanReturnValue(WrapStruct(creds));
 }
 
 NAN_METHOD(Credentials::CreateIam) {
@@ -195,8 +202,17 @@ NAN_METHOD(Credentials::CreateIam) {
   }
   NanUtf8String auth_token(args[0]);
   NanUtf8String auth_selector(args[1]);
-  NanReturnValue(
-      WrapStruct(grpc_iam_credentials_create(*auth_token, *auth_selector)));
+  grpc_credentials *creds = grpc_iam_credentials_create(*auth_token,
+                                                       *auth_selector);
+  if (creds == NULL) {
+    NanReturnNull();
+  }
+  NanReturnValue(WrapStruct(creds));
+}
+
+NAN_METHOD(Credentials::CreateInsecure) {
+  NanScope();
+  NanReturnValue(WrapStruct(NULL));
 }
 
 }  // namespace node
diff --git a/src/node/ext/credentials.h b/src/node/ext/credentials.h
index 794736fe1a..62957e61c3 100644
--- a/src/node/ext/credentials.h
+++ b/src/node/ext/credentials.h
@@ -68,6 +68,7 @@ class Credentials : public ::node::ObjectWrap {
   static NAN_METHOD(CreateGce);
   static NAN_METHOD(CreateFake);
   static NAN_METHOD(CreateIam);
+  static NAN_METHOD(CreateInsecure);
   static NanCallback *constructor;
   // Used for typechecking instances of this javascript class
   static v8::Persistent<v8::FunctionTemplate> fun_tpl;
diff --git a/src/node/ext/server.cc b/src/node/ext/server.cc
index 34cde9ffab..1dc179db3d 100644
--- a/src/node/ext/server.cc
+++ b/src/node/ext/server.cc
@@ -108,7 +108,7 @@ class NewCallOp : public Op {
 
  protected:
   std::string GetTypeString() const {
-    return "new call";
+    return "new_call";
   }
 };
 
@@ -136,10 +136,6 @@ void Server::Init(Handle<Object> exports) {
       tpl, "addHttp2Port",
       NanNew<FunctionTemplate>(AddHttp2Port)->GetFunction());
 
-  NanSetPrototypeTemplate(
-      tpl, "addSecureHttp2Port",
-      NanNew<FunctionTemplate>(AddSecureHttp2Port)->GetFunction());
-
   NanSetPrototypeTemplate(tpl, "start",
                           NanNew<FunctionTemplate>(Start)->GetFunction());
 
@@ -248,43 +244,35 @@ NAN_METHOD(Server::RequestCall) {
 NAN_METHOD(Server::AddHttp2Port) {
   NanScope();
   if (!HasInstance(args.This())) {
-    return NanThrowTypeError("addHttp2Port can only be called on a Server");
-  }
-  if (!args[0]->IsString()) {
-    return NanThrowTypeError("addHttp2Port's argument must be a String");
-  }
-  Server *server = ObjectWrap::Unwrap<Server>(args.This());
-  if (server->wrapped_server == NULL) {
-    return NanThrowError("addHttp2Port cannot be called on a shut down Server");
-  }
-  NanReturnValue(NanNew<Number>(grpc_server_add_http2_port(
-      server->wrapped_server, *NanUtf8String(args[0]))));
-}
-
-NAN_METHOD(Server::AddSecureHttp2Port) {
-  NanScope();
-  if (!HasInstance(args.This())) {
     return NanThrowTypeError(
-        "addSecureHttp2Port can only be called on a Server");
+        "addHttp2Port can only be called on a Server");
   }
   if (!args[0]->IsString()) {
     return NanThrowTypeError(
-        "addSecureHttp2Port's first argument must be a String");
+        "addHttp2Port's first argument must be a String");
   }
   if (!ServerCredentials::HasInstance(args[1])) {
     return NanThrowTypeError(
-        "addSecureHttp2Port's second argument must be ServerCredentials");
+        "addHttp2Port's second argument must be ServerCredentials");
   }
   Server *server = ObjectWrap::Unwrap<Server>(args.This());
   if (server->wrapped_server == NULL) {
     return NanThrowError(
-        "addSecureHttp2Port cannot be called on a shut down Server");
+        "addHttp2Port cannot be called on a shut down Server");
   }
-  ServerCredentials *creds = ObjectWrap::Unwrap<ServerCredentials>(
+  ServerCredentials *creds_object = ObjectWrap::Unwrap<ServerCredentials>(
       args[1]->ToObject());
-  NanReturnValue(NanNew<Number>(grpc_server_add_secure_http2_port(
-      server->wrapped_server, *NanUtf8String(args[0]),
-      creds->GetWrappedServerCredentials())));
+  grpc_server_credentials *creds = creds_object->GetWrappedServerCredentials();
+  int port;
+  if (creds == NULL) {
+    port = grpc_server_add_insecure_http2_port(server->wrapped_server,
+                                               *NanUtf8String(args[0]));
+  } else {
+    port = grpc_server_add_secure_http2_port(server->wrapped_server,
+                                             *NanUtf8String(args[0]),
+                                             creds);
+  }
+  NanReturnValue(NanNew<Number>(port));
 }
 
 NAN_METHOD(Server::Start) {
diff --git a/src/node/ext/server.h b/src/node/ext/server.h
index 5b4b18a0e0..faab7e3418 100644
--- a/src/node/ext/server.h
+++ b/src/node/ext/server.h
@@ -66,7 +66,6 @@ class Server : public ::node::ObjectWrap {
   static NAN_METHOD(New);
   static NAN_METHOD(RequestCall);
   static NAN_METHOD(AddHttp2Port);
-  static NAN_METHOD(AddSecureHttp2Port);
   static NAN_METHOD(Start);
   static NAN_METHOD(Shutdown);
   static NanCallback *constructor;
diff --git a/src/node/ext/server_credentials.cc b/src/node/ext/server_credentials.cc
index d2b63cdc4e..1b8e7b43fb 100644
--- a/src/node/ext/server_credentials.cc
+++ b/src/node/ext/server_credentials.cc
@@ -73,8 +73,8 @@ void ServerCredentials::Init(Handle<Object> exports) {
   Handle<Function> ctr = tpl->GetFunction();
   ctr->Set(NanNew("createSsl"),
            NanNew<FunctionTemplate>(CreateSsl)->GetFunction());
-  ctr->Set(NanNew("createFake"),
-           NanNew<FunctionTemplate>(CreateFake)->GetFunction());
+  ctr->Set(NanNew("createInsecure"),
+           NanNew<FunctionTemplate>(CreateInsecure)->GetFunction());
   constructor = new NanCallback(ctr);
   exports->Set(NanNew("ServerCredentials"), ctr);
 }
@@ -87,9 +87,6 @@ bool ServerCredentials::HasInstance(Handle<Value> val) {
 Handle<Value> ServerCredentials::WrapStruct(
     grpc_server_credentials *credentials) {
   NanEscapableScope();
-  if (credentials == NULL) {
-    return NanEscapeScope(NanNull());
-  }
   const int argc = 1;
   Handle<Value> argv[argc] = {
     NanNew<External>(reinterpret_cast<void *>(credentials))};
@@ -140,14 +137,19 @@ NAN_METHOD(ServerCredentials::CreateSsl) {
     return NanThrowTypeError("createSsl's third argument must be a Buffer");
   }
   key_cert_pair.cert_chain = ::node::Buffer::Data(args[2]);
-  NanReturnValue(WrapStruct(
-      grpc_ssl_server_credentials_create(root_certs, &key_cert_pair, 1)));
+  // TODO Add a force_client_auth parameter and pass it as the last parameter
+  // here.
+  grpc_server_credentials *creds =
+      grpc_ssl_server_credentials_create(root_certs, &key_cert_pair, 1, 0);
+  if (creds == NULL) {
+    NanReturnNull();
+  }
+  NanReturnValue(WrapStruct(creds));
 }
 
-NAN_METHOD(ServerCredentials::CreateFake) {
+NAN_METHOD(ServerCredentials::CreateInsecure) {
   NanScope();
-  NanReturnValue(
-      WrapStruct(grpc_fake_transport_security_server_credentials_create()));
+  NanReturnValue(WrapStruct(NULL));
 }
 
 }  // namespace node
diff --git a/src/node/ext/server_credentials.h b/src/node/ext/server_credentials.h
index aaa7ef297a..63903f663c 100644
--- a/src/node/ext/server_credentials.h
+++ b/src/node/ext/server_credentials.h
@@ -63,7 +63,7 @@ class ServerCredentials : public ::node::ObjectWrap {
 
   static NAN_METHOD(New);
   static NAN_METHOD(CreateSsl);
-  static NAN_METHOD(CreateFake);
+  static NAN_METHOD(CreateInsecure);
   static NanCallback *constructor;
   // Used for typechecking instances of this javascript class
   static v8::Persistent<v8::FunctionTemplate> fun_tpl;
diff --git a/src/node/ext/timeval.cc b/src/node/ext/timeval.cc
index 60de4d816d..bf68513c48 100644
--- a/src/node/ext/timeval.cc
+++ b/src/node/ext/timeval.cc
@@ -52,6 +52,7 @@ gpr_timespec MillisecondsToTimespec(double millis) {
 }
 
 double TimespecToMilliseconds(gpr_timespec timespec) {
+  timespec = gpr_convert_clock_type(timespec, GPR_CLOCK_REALTIME);
   if (gpr_time_cmp(timespec, gpr_inf_future(GPR_CLOCK_REALTIME)) == 0) {
     return std::numeric_limits<double>::infinity();
   } else if (gpr_time_cmp(timespec, gpr_inf_past(GPR_CLOCK_REALTIME)) == 0) {
diff --git a/src/node/index.js b/src/node/index.js
index d81e780443..b26ab35f2c 100644
--- a/src/node/index.js
+++ b/src/node/index.js
@@ -48,7 +48,7 @@ var grpc = require('bindings')('grpc');
  * @param {ProtoBuf.Reflect.Namespace} value The ProtoBuf object to load.
  * @return {Object<string, *>} The resulting gRPC object
  */
-function loadObject(value) {
+exports.loadObject = function loadObject(value) {
   var result = {};
   if (value.className === 'Namespace') {
     _.each(value.children, function(child) {
@@ -62,7 +62,9 @@ function loadObject(value) {
   } else {
     return value;
   }
-}
+};
+
+var loadObject = exports.loadObject;
 
 /**
  * Load a gRPC object from a .proto file.
@@ -71,7 +73,7 @@ function loadObject(value) {
  *     'json'. Defaults to 'proto'
  * @return {Object<string, *>} The resulting gRPC object
  */
-function load(filename, format) {
+exports.load = function load(filename, format) {
   if (!format) {
     format = 'proto';
   }
@@ -88,7 +90,7 @@ function load(filename, format) {
   }
 
   return loadObject(builder.ns);
-}
+};
 
 /**
  * Get a function that a client can use to update metadata with authentication
@@ -97,7 +99,7 @@ function load(filename, format) {
  * @param {Object} credential The credential object to use
  * @return {function(Object, callback)} Metadata updater function
  */
-function getGoogleAuthDelegate(credential) {
+exports.getGoogleAuthDelegate = function getGoogleAuthDelegate(credential) {
   /**
    * Update a metadata object with authentication information.
    * @param {string} authURI The uri to authenticate to
@@ -120,20 +122,10 @@ function getGoogleAuthDelegate(credential) {
       callback(null, metadata);
     });
   };
-}
-
-/**
- * See docs for loadObject
- */
-exports.loadObject = loadObject;
+};
 
 /**
- * See docs for load
- */
-exports.load = load;
-
-/**
- * See docs for Server
+ * @see module:src/server.Server
  */
 exports.Server = server.Server;
 
@@ -141,6 +133,7 @@ exports.Server = server.Server;
  * Status name to code number mapping
  */
 exports.status = grpc.status;
+
 /**
  * Call error name to code number mapping
  */
@@ -156,6 +149,7 @@ exports.Credentials = grpc.Credentials;
  */
 exports.ServerCredentials = grpc.ServerCredentials;
 
-exports.getGoogleAuthDelegate = getGoogleAuthDelegate;
-
+/**
+ * @see module:src/client.makeClientConstructor
+ */
 exports.makeGenericClientConstructor = client.makeClientConstructor;
diff --git a/src/node/interop/interop_client.js b/src/node/interop/interop_client.js
index e810e68e45..236b36616c 100644
--- a/src/node/interop/interop_client.js
+++ b/src/node/interop/interop_client.js
@@ -397,6 +397,7 @@ var test_cases = {
 function runTest(address, host_override, test_case, tls, test_ca, done) {
   // TODO(mlumish): enable TLS functionality
   var options = {};
+  var creds;
   if (tls) {
     var ca_path;
     if (test_ca) {
@@ -405,13 +406,14 @@ function runTest(address, host_override, test_case, tls, test_ca, done) {
       ca_path = process.env.SSL_CERT_FILE;
     }
     var ca_data = fs.readFileSync(ca_path);
-    var creds = grpc.Credentials.createSsl(ca_data);
-    options.credentials = creds;
+    creds = grpc.Credentials.createSsl(ca_data);
     if (host_override) {
       options['grpc.ssl_target_name_override'] = host_override;
     }
+  } else {
+    creds = grpc.Credentials.createInsecure();
   }
-  var client = new testProto.TestService(address, options);
+  var client = new testProto.TestService(address, creds, options);
 
   test_cases[test_case](client, done);
 }
diff --git a/src/node/interop/interop_server.js b/src/node/interop/interop_server.js
index 505c6bb537..ece22cce31 100644
--- a/src/node/interop/interop_server.js
+++ b/src/node/interop/interop_server.js
@@ -161,7 +161,7 @@ function handleHalfDuplex(call) {
 function getServer(port, tls) {
   // TODO(mlumish): enable TLS functionality
   var options = {};
-  var server_creds = null;
+  var server_creds;
   if (tls) {
     var key_path = path.join(__dirname, '../test/data/server1.key');
     var pem_path = path.join(__dirname, '../test/data/server1.pem');
@@ -171,6 +171,8 @@ function getServer(port, tls) {
     server_creds = grpc.ServerCredentials.createSsl(null,
                                                     key_data,
                                                     pem_data);
+  } else {
+    server_creds = grpc.ServerCredentials.createInsecure();
   }
   var server = new grpc.Server(options);
   server.addProtoService(testProto.TestService.service, {
diff --git a/src/node/jsdoc_conf.json b/src/node/jsdoc_conf.json
new file mode 100644
index 0000000000..876a8e19c6
--- /dev/null
+++ b/src/node/jsdoc_conf.json
@@ -0,0 +1,22 @@
+{
+  "tags": {
+    "allowUnknownTags": true
+  },
+  "source": {
+    "include": [ "index.js", "src" ],
+    "includePattern": ".+\\.js(doc)?$",
+    "excludePattern": "(^|\\/|\\\\)_"
+  },
+  "opts": {
+    "package": "package.json",
+    "readme": "README.md"
+  },
+  "plugins": [],
+  "templates": {
+    "cleverLinks": false,
+    "monospaceLinks": false,
+    "default": {
+      "outputSourceFiles": true
+    }
+  }
+}
diff --git a/src/node/package.json b/src/node/package.json
index 1caf158792..756d41b0af 100644
--- a/src/node/package.json
+++ b/src/node/package.json
@@ -21,7 +21,8 @@
   },
   "scripts": {
     "lint": "node ./node_modules/jshint/bin/jshint src test examples interop index.js",
-    "test": "node ./node_modules/mocha/bin/mocha && npm run-script lint"
+    "test": "node ./node_modules/mocha/bin/mocha && npm run-script lint",
+    "gen_docs": "./node_modules/.bin/jsdoc -c jsdoc_conf.json"
   },
   "dependencies": {
     "bindings": "^1.2.0",
@@ -32,6 +33,7 @@
   "devDependencies": {
     "async": "^0.9.0",
     "google-auth-library": "^0.9.2",
+    "jsdoc": "^3.3.2",
     "jshint": "^2.5.0",
     "minimist": "^1.1.0",
     "mocha": "~1.21.0",
diff --git a/src/node/src/client.js b/src/node/src/client.js
index da6327b432..b2b4423707 100644
--- a/src/node/src/client.js
+++ b/src/node/src/client.js
@@ -31,6 +31,11 @@
  *
  */
 
+/**
+ * Server module
+ * @module
+ */
+
 'use strict';
 
 var _ = require('lodash');
@@ -72,6 +77,7 @@ function ClientWritableStream(call, serialize) {
 /**
  * Attempt to write the given chunk. Calls the callback when done. This is an
  * implementation of a method needed for implementing stream.Writable.
+ * @access private
  * @param {Buffer} chunk The chunk to write
  * @param {string} encoding Ignored
  * @param {function(Error=)} callback Called when the write is complete
@@ -110,6 +116,7 @@ function ClientReadableStream(call, deserialize) {
 
 /**
  * Read the next object from the stream.
+ * @access private
  * @param {*} size Ignored because we use objectMode=true
  */
 function _read(size) {
@@ -188,6 +195,19 @@ ClientWritableStream.prototype.cancel = cancel;
 ClientDuplexStream.prototype.cancel = cancel;
 
 /**
+ * Get the endpoint this call/stream is connected to.
+ * @return {string} The URI of the endpoint
+ */
+function getPeer() {
+  /* jshint validthis: true */
+  return this.call.getPeer();
+}
+
+ClientReadableStream.prototype.getPeer = getPeer;
+ClientWritableStream.prototype.getPeer = getPeer;
+ClientDuplexStream.prototype.getPeer = getPeer;
+
+/**
  * Get a function that can make unary requests to the specified method.
  * @param {string} method The name of the method to request
  * @param {function(*):Buffer} serialize The serialization function for inputs
@@ -223,6 +243,9 @@ function makeUnaryRequestFunction(method, serialize, deserialize) {
     emitter.cancel = function cancel() {
       call.cancel();
     };
+    emitter.getPeer = function getPeer() {
+      return call.getPeer();
+    };
     this.updateMetadata(this.auth_uri, metadata, function(error, metadata) {
       if (error) {
         call.cancel();
@@ -503,16 +526,18 @@ var requester_makers = {
  * @param {string} serviceName The name of the service
  * @return {function(string, Object)} New client constructor
  */
-function makeClientConstructor(methods, serviceName) {
+exports.makeClientConstructor = function(methods, serviceName) {
   /**
    * Create a client with the given methods
    * @constructor
    * @param {string} address The address of the server to connect to
+   * @param {grpc.Credentials} credentials Credentials to use to connect
+   *     to the server
    * @param {Object} options Options to pass to the underlying channel
    * @param {function(string, Object, function)=} updateMetadata function to
    *     update the metadata for each request
    */
-  function Client(address, options, updateMetadata) {
+  function Client(address, credentials, options, updateMetadata) {
     if (!updateMetadata) {
       updateMetadata = function(uri, metadata, callback) {
         callback(null, metadata);
@@ -522,7 +547,7 @@ function makeClientConstructor(methods, serviceName) {
       options = {};
     }
     options['grpc.primary_user_agent'] = 'grpc-node/' + version;
-    this.channel = new grpc.Channel(address, options);
+    this.channel = new grpc.Channel(address, credentials, options);
     this.server_address = address.replace(/\/$/, '');
     this.auth_uri = this.server_address + '/' + serviceName;
     this.updateMetadata = updateMetadata;
@@ -552,7 +577,7 @@ function makeClientConstructor(methods, serviceName) {
   });
 
   return Client;
-}
+};
 
 /**
  * Creates a constructor for clients for the given service
@@ -560,22 +585,18 @@ function makeClientConstructor(methods, serviceName) {
  *     for
  * @return {function(string, Object)} New client constructor
  */
-function makeProtobufClientConstructor(service) {
+exports.makeProtobufClientConstructor =  function(service) {
   var method_attrs = common.getProtobufServiceAttrs(service, service.name);
-  var Client = makeClientConstructor(method_attrs);
+  var Client = exports.makeClientConstructor(method_attrs);
   Client.service = service;
-
   return Client;
-}
-
-exports.makeClientConstructor = makeClientConstructor;
-
-exports.makeProtobufClientConstructor = makeProtobufClientConstructor;
+};
 
 /**
- * See docs for client.status
+ * Map of status code names to status codes
  */
 exports.status = grpc.status;
+
 /**
  * See docs for client.callError
  */
diff --git a/src/node/src/common.js b/src/node/src/common.js
index feaa859a4f..5551ebeec8 100644
--- a/src/node/src/common.js
+++ b/src/node/src/common.js
@@ -31,6 +31,10 @@
  *
  */
 
+/**
+ * @module
+ */
+
 'use strict';
 
 var _ = require('lodash');
@@ -40,7 +44,7 @@ var _ = require('lodash');
  * @param {function()} cls The constructor of the message type to deserialize
  * @return {function(Buffer):cls} The deserialization function
  */
-function deserializeCls(cls) {
+exports.deserializeCls = function deserializeCls(cls) {
   /**
    * Deserialize a buffer to a message object
    * @param {Buffer} arg_buf The buffer to deserialize
@@ -51,14 +55,16 @@ function deserializeCls(cls) {
     // and longs as strings (second argument)
     return cls.decode(arg_buf).toRaw(false, true);
   };
-}
+};
+
+var deserializeCls = exports.deserializeCls;
 
 /**
  * Get a function that serializes objects to a buffer by protobuf class.
  * @param {function()} Cls The constructor of the message type to serialize
  * @return {function(Cls):Buffer} The serialization function
  */
-function serializeCls(Cls) {
+exports.serializeCls = function serializeCls(Cls) {
   /**
    * Serialize an object to a Buffer
    * @param {Object} arg The object to serialize
@@ -67,14 +73,16 @@ function serializeCls(Cls) {
   return function serialize(arg) {
     return new Buffer(new Cls(arg).encode().toBuffer());
   };
-}
+};
+
+var serializeCls = exports.serializeCls;
 
 /**
  * Get the fully qualified (dotted) name of a ProtoBuf.Reflect value.
  * @param {ProtoBuf.Reflect.Namespace} value The value to get the name of
  * @return {string} The fully qualified name of the value
  */
-function fullyQualifiedName(value) {
+exports.fullyQualifiedName = function fullyQualifiedName(value) {
   if (value === null || value === undefined) {
     return '';
   }
@@ -89,7 +97,9 @@ function fullyQualifiedName(value) {
     }
   }
   return name;
-}
+};
+
+var fullyQualifiedName = exports.fullyQualifiedName;
 
 /**
  * Wrap a function to pass null-like values through without calling it. If no
@@ -97,7 +107,7 @@ function fullyQualifiedName(value) {
  * @param {?function} func The function to wrap
  * @return {function} The wrapped function
  */
-function wrapIgnoreNull(func) {
+exports.wrapIgnoreNull = function wrapIgnoreNull(func) {
   if (!func) {
     return _.identity;
   }
@@ -107,14 +117,14 @@ function wrapIgnoreNull(func) {
     }
     return func(arg);
   };
-}
+};
 
 /**
  * Return a map from method names to method attributes for the service.
  * @param {ProtoBuf.Reflect.Service} service The service to get attributes for
  * @return {Object} The attributes map
  */
-function getProtobufServiceAttrs(service) {
+exports.getProtobufServiceAttrs = function getProtobufServiceAttrs(service) {
   var prefix = '/' + fullyQualifiedName(service) + '/';
   return _.object(_.map(service.children, function(method) {
     return [_.camelCase(method.name), {
@@ -127,26 +137,4 @@ function getProtobufServiceAttrs(service) {
       responseDeserialize: deserializeCls(method.resolvedResponseType.build())
     }];
   }));
-}
-
-/**
- * See docs for deserializeCls
- */
-exports.deserializeCls = deserializeCls;
-
-/**
- * See docs for serializeCls
- */
-exports.serializeCls = serializeCls;
-
-/**
- * See docs for fullyQualifiedName
- */
-exports.fullyQualifiedName = fullyQualifiedName;
-
-/**
- * See docs for wrapIgnoreNull
- */
-exports.wrapIgnoreNull = wrapIgnoreNull;
-
-exports.getProtobufServiceAttrs = getProtobufServiceAttrs;
+};
diff --git a/src/node/src/server.js b/src/node/src/server.js
index 0a3a0031bd..5c62f5990c 100644
--- a/src/node/src/server.js
+++ b/src/node/src/server.js
@@ -31,6 +31,11 @@
  *
  */
 
+/**
+ * Server module
+ * @module
+ */
+
 'use strict';
 
 var _ = require('lodash');
@@ -50,6 +55,7 @@ var EventEmitter = require('events').EventEmitter;
 
 /**
  * Handle an error on a call by sending it as a status
+ * @access private
  * @param {grpc.Call} call The call to send the error on
  * @param {Object} error The error object
  */
@@ -82,6 +88,7 @@ function handleError(call, error) {
 /**
  * Wait for the client to close, then emit a cancelled event if the client
  * cancelled.
+ * @access private
  * @param {grpc.Call} call The call object to wait on
  * @param {EventEmitter} emitter The event emitter to emit the cancelled event
  *     on
@@ -102,6 +109,7 @@ function waitForCancel(call, emitter) {
 
 /**
  * Send a response to a unary or client streaming call.
+ * @access private
  * @param {grpc.Call} call The call to respond on
  * @param {*} value The value to respond with
  * @param {function(*):Buffer=} serialize Serialization function for the
@@ -130,6 +138,7 @@ function sendUnaryResponse(call, value, serialize, metadata) {
 /**
  * Initialize a writable stream. This is used for both the writable and duplex
  * stream constructors.
+ * @access private
  * @param {Writable} stream The stream to set up
  * @param {function(*):Buffer=} Serialization function for responses
  */
@@ -203,6 +212,7 @@ function setUpWritable(stream, serialize) {
 /**
  * Initialize a readable stream. This is used for both the readable and duplex
  * stream constructors.
+ * @access private
  * @param {Readable} stream The stream to initialize
  * @param {function(Buffer):*=} deserialize Deserialization function for
  *     incoming data.
@@ -242,6 +252,7 @@ function ServerWritableStream(call, serialize) {
 /**
  * Start writing a chunk of data. This is an implementation of a method required
  * for implementing stream.Writable.
+ * @access private
  * @param {Buffer} chunk The chunk of data to write
  * @param {string} encoding Ignored
  * @param {function(Error=)} callback Callback to indicate that the write is
@@ -266,6 +277,11 @@ function _write(chunk, encoding, callback) {
 
 ServerWritableStream.prototype._write = _write;
 
+/**
+ * Send the initial metadata for a writable stream.
+ * @param {Object<String, Array<(String|Buffer)>>} responseMetadata Metadata
+ *   to send
+ */
 function sendMetadata(responseMetadata) {
   /* jshint validthis: true */
   if (!this.call.metadataSent) {
@@ -281,6 +297,10 @@ function sendMetadata(responseMetadata) {
   }
 }
 
+/**
+ * @inheritdoc
+ * @alias module:src/server~ServerWritableStream#sendMetadata
+ */
 ServerWritableStream.prototype.sendMetadata = sendMetadata;
 
 util.inherits(ServerReadableStream, Readable);
@@ -301,6 +321,7 @@ function ServerReadableStream(call, deserialize) {
 /**
  * Start reading from the gRPC data source. This is an implementation of a
  * method required for implementing stream.Readable
+ * @access private
  * @param {number} size Ignored
  */
 function _read(size) {
@@ -374,7 +395,21 @@ ServerDuplexStream.prototype._write = _write;
 ServerDuplexStream.prototype.sendMetadata = sendMetadata;
 
 /**
+ * Get the endpoint this call/stream is connected to.
+ * @return {string} The URI of the endpoint
+ */
+function getPeer() {
+  /* jshint validthis: true */
+  return this.call.getPeer();
+}
+
+ServerReadableStream.prototype.getPeer = getPeer;
+ServerWritableStream.prototype.getPeer = getPeer;
+ServerDuplexStream.prototype.getPeer = getPeer;
+
+/**
  * Fully handle a unary call
+ * @access private
  * @param {grpc.Call} call The call to handle
  * @param {Object} handler Request handler object for the method that was called
  * @param {Object} metadata Metadata from the client
@@ -389,6 +424,9 @@ function handleUnary(call, handler, metadata) {
       call.startBatch(batch, function() {});
     }
   };
+  emitter.getPeer = function() {
+    return call.getPeer();
+  };
   emitter.on('error', function(error) {
     handleError(call, error);
   });
@@ -426,6 +464,7 @@ function handleUnary(call, handler, metadata) {
 
 /**
  * Fully handle a server streaming call
+ * @access private
  * @param {grpc.Call} call The call to handle
  * @param {Object} handler Request handler object for the method that was called
  * @param {Object} metadata Metadata from the client
@@ -454,6 +493,7 @@ function handleServerStreaming(call, handler, metadata) {
 
 /**
  * Fully handle a client streaming call
+ * @access private
  * @param {grpc.Call} call The call to handle
  * @param {Object} handler Request handler object for the method that was called
  * @param {Object} metadata Metadata from the client
@@ -488,6 +528,7 @@ function handleClientStreaming(call, handler, metadata) {
 
 /**
  * Fully handle a bidirectional streaming call
+ * @access private
  * @param {grpc.Call} call The call to handle
  * @param {Object} handler Request handler object for the method that was called
  * @param {Object} metadata Metadata from the client
@@ -544,7 +585,7 @@ function Server(options) {
       if (err) {
         return;
       }
-      var details = event['new call'];
+      var details = event.new_call;
       var call = details.call;
       var method = details.method;
       var metadata = details.metadata;
@@ -571,7 +612,8 @@ function Server(options) {
     }
     server.requestCall(handleNewCall);
   };
-  /** Shuts down the server.
+  /**
+   * Shuts down the server.
    */
   this.shutdown = function() {
     server.shutdown();
@@ -605,6 +647,15 @@ Server.prototype.register = function(name, handler, serialize, deserialize,
   return true;
 };
 
+/**
+ * Add a service to the server, with a corresponding implementation. If you are
+ * generating this from a proto file, you should instead use
+ * addProtoService.
+ * @param {Object<String, *>} service The service descriptor, as
+ *     {@link module:src/common.getProtobufServiceAttrs} returns
+ * @param {Object<String, function>} implementation Map of method names to
+ *     method implementation for the provided service.
+ */
 Server.prototype.addService = function(service, implementation) {
   if (this.started) {
     throw new Error('Can\'t add a service to a started server.');
@@ -642,6 +693,12 @@ Server.prototype.addService = function(service, implementation) {
   });
 };
 
+/**
+ * Add a proto service to the server, with a corresponding implementation
+ * @param {Protobuf.Reflect.Service} service The proto service descriptor
+ * @param {Object<String, function>} implementation Map of method names to
+ *     method implementation for the provided service.
+ */
 Server.prototype.addProtoService = function(service, implementation) {
   this.addService(common.getProtobufServiceAttrs(service), implementation);
 };
@@ -657,14 +714,10 @@ Server.prototype.bind = function(port, creds) {
   if (this.started) {
     throw new Error('Can\'t bind an already running server to an address');
   }
-  if (creds) {
-    return this._server.addSecureHttp2Port(port, creds);
-  } else {
-    return this._server.addHttp2Port(port);
-  }
+  return this._server.addHttp2Port(port, creds);
 };
 
 /**
- * See documentation for Server
+ * @see module:src/server~Server
  */
 exports.Server = Server;
diff --git a/src/node/test/call_test.js b/src/node/test/call_test.js
index 98158ffff3..48d859a8ec 100644
--- a/src/node/test/call_test.js
+++ b/src/node/test/call_test.js
@@ -48,14 +48,17 @@ function getDeadline(timeout_secs) {
   return deadline;
 }
 
+var insecureCreds = grpc.Credentials.createInsecure();
+
 describe('call', function() {
   var channel;
   var server;
   before(function() {
     server = new grpc.Server();
-    var port = server.addHttp2Port('localhost:0');
+    var port = server.addHttp2Port('localhost:0',
+                                   grpc.ServerCredentials.createInsecure());
     server.start();
-    channel = new grpc.Channel('localhost:' + port);
+    channel = new grpc.Channel('localhost:' + port, insecureCreds);
   });
   after(function() {
     server.shutdown();
@@ -82,7 +85,7 @@ describe('call', function() {
          });
        });
     it('should fail with a closed channel', function() {
-      var local_channel = new grpc.Channel('hostname');
+      var local_channel = new grpc.Channel('hostname', insecureCreds);
       local_channel.close();
       assert.throws(function() {
         new grpc.Call(channel, 'method');
@@ -132,7 +135,7 @@ describe('call', function() {
                                                     'key2': ['value2']};
         call.startBatch(batch, function(err, resp) {
           assert.ifError(err);
-          assert.deepEqual(resp, {'send metadata': true});
+          assert.deepEqual(resp, {'send_metadata': true});
           done();
         });
       });
@@ -147,7 +150,7 @@ describe('call', function() {
         };
         call.startBatch(batch, function(err, resp) {
           assert.ifError(err);
-          assert.deepEqual(resp, {'send metadata': true});
+          assert.deepEqual(resp, {'send_metadata': true});
           done();
         });
       });
@@ -184,4 +187,10 @@ describe('call', function() {
       });
     });
   });
+  describe('getPeer', function() {
+    it('should return a string', function() {
+      var call = new grpc.Call(channel, 'method', getDeadline(1));
+      assert.strictEqual(typeof call.getPeer(), 'string');
+    });
+  });
 });
diff --git a/src/node/test/channel_test.js b/src/node/test/channel_test.js
index 33200c99ee..c991d7b25b 100644
--- a/src/node/test/channel_test.js
+++ b/src/node/test/channel_test.js
@@ -36,11 +36,13 @@
 var assert = require('assert');
 var grpc = require('bindings')('grpc.node');
 
+var insecureCreds = grpc.Credentials.createInsecure();
+
 describe('channel', function() {
   describe('constructor', function() {
     it('should require a string for the first argument', function() {
       assert.doesNotThrow(function() {
-        new grpc.Channel('hostname');
+        new grpc.Channel('hostname', insecureCreds);
       });
       assert.throws(function() {
         new grpc.Channel();
@@ -49,42 +51,59 @@ describe('channel', function() {
         new grpc.Channel(5);
       });
     });
-    it('should accept an object for the second parameter', function() {
+    it('should require a credential for the second argument', function() {
       assert.doesNotThrow(function() {
-        new grpc.Channel('hostname', {});
+        new grpc.Channel('hostname', insecureCreds);
       });
       assert.throws(function() {
         new grpc.Channel('hostname', 5);
       });
+      assert.throws(function() {
+        new grpc.Channel('hostname');
+      });
+    });
+    it('should accept an object for the third argument', function() {
+      assert.doesNotThrow(function() {
+        new grpc.Channel('hostname', insecureCreds, {});
+      });
+      assert.throws(function() {
+        new grpc.Channel('hostname', insecureCreds, 'abc');
+      });
     });
     it('should only accept objects with string or int values', function() {
       assert.doesNotThrow(function() {
-        new grpc.Channel('hostname', {'key' : 'value'});
+        new grpc.Channel('hostname', insecureCreds,{'key' : 'value'});
       });
       assert.doesNotThrow(function() {
-        new grpc.Channel('hostname', {'key' : 5});
+        new grpc.Channel('hostname', insecureCreds, {'key' : 5});
       });
       assert.throws(function() {
-        new grpc.Channel('hostname', {'key' : null});
+        new grpc.Channel('hostname', insecureCreds, {'key' : null});
       });
       assert.throws(function() {
-        new grpc.Channel('hostname', {'key' : new Date()});
+        new grpc.Channel('hostname', insecureCreds, {'key' : new Date()});
       });
     });
   });
   describe('close', function() {
     it('should succeed silently', function() {
-      var channel = new grpc.Channel('hostname', {});
+      var channel = new grpc.Channel('hostname', insecureCreds, {});
       assert.doesNotThrow(function() {
         channel.close();
       });
     });
     it('should be idempotent', function() {
-      var channel = new grpc.Channel('hostname', {});
+      var channel = new grpc.Channel('hostname', insecureCreds, {});
       assert.doesNotThrow(function() {
         channel.close();
         channel.close();
       });
     });
   });
+  describe('getTarget', function() {
+    it('should return a string', function() {
+      var channel = new grpc.Channel('localhost', insecureCreds, {});
+      assert.strictEqual(typeof channel.getTarget(), 'string');
+    });
+  });
 });
diff --git a/src/node/test/end_to_end_test.js b/src/node/test/end_to_end_test.js
index 667852f382..ea41dfc28c 100644
--- a/src/node/test/end_to_end_test.js
+++ b/src/node/test/end_to_end_test.js
@@ -57,14 +57,17 @@ function multiDone(done, count) {
   };
 }
 
+var insecureCreds = grpc.Credentials.createInsecure();
+
 describe('end-to-end', function() {
   var server;
   var channel;
   before(function() {
     server = new grpc.Server();
-    var port_num = server.addHttp2Port('0.0.0.0:0');
+    var port_num = server.addHttp2Port('0.0.0.0:0',
+                                       grpc.ServerCredentials.createInsecure());
     server.start();
-    channel = new grpc.Channel('localhost:' + port_num);
+    channel = new grpc.Channel('localhost:' + port_num, insecureCreds);
   });
   after(function() {
     server.shutdown();
@@ -85,37 +88,37 @@ describe('end-to-end', function() {
     call.startBatch(client_batch, function(err, response) {
       assert.ifError(err);
       assert.deepEqual(response, {
-        'send metadata': true,
-        'client close': true,
-        'metadata': {},
-        'status': {
-          'code': grpc.status.OK,
-          'details': status_text,
-          'metadata': {}
+        send_metadata: true,
+        client_close: true,
+        metadata: {},
+        status: {
+          code: grpc.status.OK,
+          details: status_text,
+          metadata: {}
         }
       });
       done();
     });
 
     server.requestCall(function(err, call_details) {
-      var new_call = call_details['new call'];
+      var new_call = call_details.new_call;
       assert.notEqual(new_call, null);
       var server_call = new_call.call;
       assert.notEqual(server_call, null);
       var server_batch = {};
       server_batch[grpc.opType.SEND_INITIAL_METADATA] = {};
       server_batch[grpc.opType.SEND_STATUS_FROM_SERVER] = {
-        'metadata': {},
-        'code': grpc.status.OK,
-        'details': status_text
+        metadata: {},
+        code: grpc.status.OK,
+        details: status_text
       };
       server_batch[grpc.opType.RECV_CLOSE_ON_SERVER] = true;
       server_call.startBatch(server_batch, function(err, response) {
         assert.ifError(err);
         assert.deepEqual(response, {
-          'send metadata': true,
-          'send status': true,
-          'cancelled': false
+          send_metadata: true,
+          send_status: true,
+          cancelled: false
         });
        done();
       });
@@ -131,7 +134,7 @@ describe('end-to-end', function() {
                              Infinity);
     var client_batch = {};
     client_batch[grpc.opType.SEND_INITIAL_METADATA] = {
-      'client_key': ['client_value']
+      client_key: ['client_value']
     };
     client_batch[grpc.opType.SEND_CLOSE_FROM_CLIENT] = true;
     client_batch[grpc.opType.RECV_INITIAL_METADATA] = true;
@@ -139,18 +142,18 @@ describe('end-to-end', function() {
     call.startBatch(client_batch, function(err, response) {
       assert.ifError(err);
       assert.deepEqual(response,{
-        'send metadata': true,
-        'client close': true,
+        send_metadata: true,
+        client_close: true,
         metadata: {server_key: ['server_value']},
-        status: {'code': grpc.status.OK,
-                 'details': status_text,
-                 'metadata': {}}
+        status: {code: grpc.status.OK,
+                 details: status_text,
+                 metadata: {}}
       });
       done();
     });
 
     server.requestCall(function(err, call_details) {
-      var new_call = call_details['new call'];
+      var new_call = call_details.new_call;
       assert.notEqual(new_call, null);
       assert.strictEqual(new_call.metadata.client_key[0],
                          'client_value');
@@ -158,20 +161,20 @@ describe('end-to-end', function() {
       assert.notEqual(server_call, null);
       var server_batch = {};
       server_batch[grpc.opType.SEND_INITIAL_METADATA] = {
-        'server_key': ['server_value']
+        server_key: ['server_value']
       };
       server_batch[grpc.opType.SEND_STATUS_FROM_SERVER] = {
-        'metadata': {},
-        'code': grpc.status.OK,
-        'details': status_text
+        metadata: {},
+        code: grpc.status.OK,
+        details: status_text
       };
       server_batch[grpc.opType.RECV_CLOSE_ON_SERVER] = true;
       server_call.startBatch(server_batch, function(err, response) {
         assert.ifError(err);
         assert.deepEqual(response, {
-          'send metadata': true,
-          'send status': true,
-          'cancelled': false
+          send_metadata: true,
+          send_status: true,
+          cancelled: false
         });
        done();
       });
@@ -196,19 +199,19 @@ describe('end-to-end', function() {
     client_batch[grpc.opType.RECV_STATUS_ON_CLIENT] = true;
     call.startBatch(client_batch, function(err, response) {
       assert.ifError(err);
-      assert(response['send metadata']);
-      assert(response['client close']);
+      assert(response.send_metadata);
+      assert(response.client_close);
       assert.deepEqual(response.metadata, {});
-      assert(response['send message']);
+      assert(response.send_message);
       assert.strictEqual(response.read.toString(), reply_text);
-      assert.deepEqual(response.status, {'code': grpc.status.OK,
-                                         'details': status_text,
-                                         'metadata': {}});
+      assert.deepEqual(response.status, {code: grpc.status.OK,
+                                         details: status_text,
+                                         metadata: {}});
       done();
     });
 
     server.requestCall(function(err, call_details) {
-      var new_call = call_details['new call'];
+      var new_call = call_details.new_call;
       assert.notEqual(new_call, null);
       var server_call = new_call.call;
       assert.notEqual(server_call, null);
@@ -217,18 +220,18 @@ describe('end-to-end', function() {
       server_batch[grpc.opType.RECV_MESSAGE] = true;
       server_call.startBatch(server_batch, function(err, response) {
         assert.ifError(err);
-        assert(response['send metadata']);
+        assert(response.send_metadata);
         assert.strictEqual(response.read.toString(), req_text);
         var response_batch = {};
         response_batch[grpc.opType.SEND_MESSAGE] = new Buffer(reply_text);
         response_batch[grpc.opType.SEND_STATUS_FROM_SERVER] = {
-          'metadata': {},
-          'code': grpc.status.OK,
-          'details': status_text
+          metadata: {},
+          code: grpc.status.OK,
+          details: status_text
         };
         response_batch[grpc.opType.RECV_CLOSE_ON_SERVER] = true;
         server_call.startBatch(response_batch, function(err, response) {
-          assert(response['send status']);
+          assert(response.send_status);
           assert(!response.cancelled);
           done();
         });
@@ -251,9 +254,9 @@ describe('end-to-end', function() {
     call.startBatch(client_batch, function(err, response) {
       assert.ifError(err);
       assert.deepEqual(response, {
-        'send metadata': true,
-        'send message': true,
-        'metadata': {}
+        send_metadata: true,
+        send_message: true,
+        metadata: {}
       });
       var req2_batch = {};
       req2_batch[grpc.opType.SEND_MESSAGE] = new Buffer(requests[1]);
@@ -262,12 +265,12 @@ describe('end-to-end', function() {
       call.startBatch(req2_batch, function(err, resp) {
         assert.ifError(err);
         assert.deepEqual(resp, {
-          'send message': true,
-          'client close': true,
-          'status': {
-            'code': grpc.status.OK,
-            'details': status_text,
-            'metadata': {}
+          send_message: true,
+          client_close: true,
+          status: {
+            code: grpc.status.OK,
+            details: status_text,
+            metadata: {}
           }
         });
         done();
@@ -275,7 +278,7 @@ describe('end-to-end', function() {
     });
 
     server.requestCall(function(err, call_details) {
-      var new_call = call_details['new call'];
+      var new_call = call_details.new_call;
       assert.notEqual(new_call, null);
       var server_call = new_call.call;
       assert.notEqual(server_call, null);
@@ -284,7 +287,7 @@ describe('end-to-end', function() {
       server_batch[grpc.opType.RECV_MESSAGE] = true;
       server_call.startBatch(server_batch, function(err, response) {
         assert.ifError(err);
-        assert(response['send metadata']);
+        assert(response.send_metadata);
         assert.strictEqual(response.read.toString(), requests[0]);
         var snd_batch = {};
         snd_batch[grpc.opType.RECV_MESSAGE] = true;
@@ -294,13 +297,13 @@ describe('end-to-end', function() {
           var end_batch = {};
           end_batch[grpc.opType.RECV_CLOSE_ON_SERVER] = true;
           end_batch[grpc.opType.SEND_STATUS_FROM_SERVER] = {
-            'metadata': {},
-            'code': grpc.status.OK,
-            'details': status_text
+            metadata: {},
+            code: grpc.status.OK,
+            details: status_text
           };
           server_call.startBatch(end_batch, function(err, response) {
             assert.ifError(err);
-            assert(response['send status']);
+            assert(response.send_status);
             assert(!response.cancelled);
             done();
           });
diff --git a/src/node/test/health_test.js b/src/node/test/health_test.js
index bb700cc46c..be4ef1d251 100644
--- a/src/node/test/health_test.js
+++ b/src/node/test/health_test.js
@@ -54,9 +54,11 @@ describe('Health Checking', function() {
                                new health.Implementation(statusMap));
   var healthClient;
   before(function() {
-    var port_num = healthServer.bind('0.0.0.0:0');
+    var port_num = healthServer.bind('0.0.0.0:0',
+                                     grpc.ServerCredentials.createInsecure());
     healthServer.start();
-    healthClient = new health.Client('localhost:' + port_num);
+    healthClient = new health.Client('localhost:' + port_num,
+                                     grpc.Credentials.createInsecure());
   });
   after(function() {
     healthServer.shutdown();
diff --git a/src/node/test/math_client_test.js b/src/node/test/math_client_test.js
index f2751857ff..ef01870a4c 100644
--- a/src/node/test/math_client_test.js
+++ b/src/node/test/math_client_test.js
@@ -51,9 +51,11 @@ var server = require('../examples/math_server.js');
 
 describe('Math client', function() {
   before(function(done) {
-    var port_num = server.bind('0.0.0.0:0');
+    var port_num = server.bind('0.0.0.0:0',
+                               grpc.ServerCredentials.createInsecure());
     server.start();
-    math_client = new math.Math('localhost:' + port_num);
+    math_client = new math.Math('localhost:' + port_num,
+                                grpc.Credentials.createInsecure());
     done();
   });
   after(function() {
diff --git a/src/node/test/server_test.js b/src/node/test/server_test.js
index 7cb34fa0cb..a9df43909e 100644
--- a/src/node/test/server_test.js
+++ b/src/node/test/server_test.js
@@ -34,6 +34,8 @@
 'use strict';
 
 var assert = require('assert');
+var fs = require('fs');
+var path = require('path');
 var grpc = require('bindings')('grpc.node');
 
 describe('server', function() {
@@ -57,7 +59,20 @@ describe('server', function() {
     it('should bind to an unused port', function() {
       var port;
       assert.doesNotThrow(function() {
-        port = server.addHttp2Port('0.0.0.0:0');
+        port = server.addHttp2Port('0.0.0.0:0',
+                                   grpc.ServerCredentials.createInsecure());
+      });
+      assert(port > 0);
+    });
+    it('should bind to an unused port with ssl credentials', function() {
+      var port;
+      var key_path = path.join(__dirname, '../test/data/server1.key');
+      var pem_path = path.join(__dirname, '../test/data/server1.pem');
+      var key_data = fs.readFileSync(key_path);
+      var pem_data = fs.readFileSync(pem_path);
+      var creds = grpc.ServerCredentials.createSsl(null, key_data, pem_data);
+      assert.doesNotThrow(function() {
+        port = server.addHttp2Port('0.0.0.0:0', creds);
       });
       assert(port > 0);
     });
@@ -67,20 +82,12 @@ describe('server', function() {
     before(function() {
       server = new grpc.Server();
     });
-    it('should bind to an unused port with fake credentials', function() {
-      var port;
-      var creds = grpc.ServerCredentials.createFake();
-      assert.doesNotThrow(function() {
-        port = server.addSecureHttp2Port('0.0.0.0:0', creds);
-      });
-      assert(port > 0);
-    });
   });
   describe('listen', function() {
     var server;
     before(function() {
       server = new grpc.Server();
-      server.addHttp2Port('0.0.0.0:0');
+      server.addHttp2Port('0.0.0.0:0', grpc.ServerCredentials.createInsecure());
     });
     after(function() {
       server.shutdown();
diff --git a/src/node/test/surface_test.js b/src/node/test/surface_test.js
index 3cb68f8cd8..dda2f8d127 100644
--- a/src/node/test/surface_test.js
+++ b/src/node/test/surface_test.js
@@ -47,6 +47,8 @@ var mathService = math_proto.lookup('math.Math');
 
 var _ = require('lodash');
 
+var server_insecure_creds = grpc.ServerCredentials.createInsecure();
+
 describe('File loader', function() {
   it('Should load a proto file by default', function() {
     assert.doesNotThrow(function() {
@@ -122,9 +124,9 @@ describe('Echo service', function() {
         callback(null, call.request);
       }
     });
-    var port = server.bind('localhost:0');
+    var port = server.bind('localhost:0', server_insecure_creds);
     var Client = surface_client.makeProtobufClientConstructor(echo_service);
-    client = new Client('localhost:' + port);
+    client = new Client('localhost:' + port, grpc.Credentials.createInsecure());
     server.start();
   });
   after(function() {
@@ -166,10 +168,11 @@ describe('Generic client and server', function() {
           callback(null, _.capitalize(call.request));
         }
       });
-      var port = server.bind('localhost:0');
+      var port = server.bind('localhost:0', server_insecure_creds);
       server.start();
       var Client = grpc.makeGenericClientConstructor(string_service_attrs);
-      client = new Client('localhost:' + port);
+      client = new Client('localhost:' + port,
+                          grpc.Credentials.createInsecure());
     });
     after(function() {
       server.shutdown();
@@ -214,9 +217,9 @@ describe('Echo metadata', function() {
         });
       }
     });
-    var port = server.bind('localhost:0');
+    var port = server.bind('localhost:0', server_insecure_creds);
     var Client = surface_client.makeProtobufClientConstructor(test_service);
-    client = new Client('localhost:' + port);
+    client = new Client('localhost:' + port, grpc.Credentials.createInsecure());
     server.start();
   });
   after(function() {
@@ -260,9 +263,8 @@ describe('Echo metadata', function() {
   });
   it('shows the correct user-agent string', function(done) {
     var version = require('../package.json').version;
-    var call = client.unary({}, function(err, data) {
-      assert.ifError(err);
-    }, {key: ['value']});
+    var call = client.unary({}, function(err, data) { assert.ifError(err); },
+                            {key: ['value']});
     call.on('metadata', function(metadata) {
       assert(_.startsWith(metadata['user-agent'], 'grpc-node/' + version));
       done();
@@ -336,14 +338,17 @@ describe('Other conditions', function() {
         });
       }
     });
-    port = server.bind('localhost:0');
+    port = server.bind('localhost:0', server_insecure_creds);
     var Client = surface_client.makeProtobufClientConstructor(test_service);
-    client = new Client('localhost:' + port);
+    client = new Client('localhost:' + port, grpc.Credentials.createInsecure());
     server.start();
   });
   after(function() {
     server.shutdown();
   });
+  it('channel.getTarget should be available', function() {
+    assert.strictEqual(typeof client.channel.getTarget(), 'string');
+  });
   describe('Server recieving bad input', function() {
     var misbehavingClient;
     var badArg = new Buffer([0xFF]);
@@ -380,7 +385,8 @@ describe('Other conditions', function() {
       };
       var Client = surface_client.makeClientConstructor(test_service_attrs,
                                                         'TestService');
-      misbehavingClient = new Client('localhost:' + port);
+      misbehavingClient = new Client('localhost:' + port,
+                                     grpc.Credentials.createInsecure());
     });
     it('should respond correctly to a unary call', function(done) {
       misbehavingClient.unary(badArg, function(err, data) {
@@ -549,6 +555,43 @@ describe('Other conditions', function() {
       });
     });
   });
+  describe('call.getPeer should return the peer', function() {
+    it('for a unary call', function(done) {
+      var call = client.unary({error: false}, function(err, data) {
+        assert.ifError(err);
+        done();
+      });
+      assert.strictEqual(typeof call.getPeer(), 'string');
+    });
+    it('for a client stream call', function(done) {
+      var call = client.clientStream(function(err, data) {
+        assert.ifError(err);
+        done();
+      });
+      assert.strictEqual(typeof call.getPeer(), 'string');
+      call.write({error: false});
+      call.end();
+    });
+    it('for a server stream call', function(done) {
+      var call = client.serverStream({error: false});
+      assert.strictEqual(typeof call.getPeer(), 'string');
+      call.on('data', function(){});
+      call.on('status', function(status) {
+        assert.strictEqual(status.code, grpc.status.OK);
+        done();
+      });
+    });
+    it('for a bidi stream call', function(done) {
+      var call = client.bidiStream();
+      assert.strictEqual(typeof call.getPeer(), 'string');
+      call.write({error: false});
+      call.end();
+      call.on('data', function(){});
+      call.on('status', function(status) {
+        done();
+      });
+    });
+  });
 });
 describe('Cancelling surface client', function() {
   var client;
@@ -561,9 +604,9 @@ describe('Cancelling surface client', function() {
       'fib': function(stream) {},
       'sum': function(stream) {}
     });
-    var port = server.bind('localhost:0');
+    var port = server.bind('localhost:0', server_insecure_creds);
     var Client = surface_client.makeProtobufClientConstructor(mathService);
-    client = new Client('localhost:' + port);
+    client = new Client('localhost:' + port, grpc.Credentials.createInsecure());
     server.start();
   });
   after(function() {
diff --git a/src/objective-c/GRPCClient/GRPCCall+OAuth2.h b/src/objective-c/GRPCClient/GRPCCall+OAuth2.h
new file mode 100644
index 0000000000..2e379a7157
--- /dev/null
+++ b/src/objective-c/GRPCClient/GRPCCall+OAuth2.h
@@ -0,0 +1,49 @@
+/*
+ *
+ * Copyright 2015, Google Inc.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *
+ *     * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above
+ * copyright notice, this list of conditions and the following disclaimer
+ * in the documentation and/or other materials provided with the
+ * distribution.
+ *     * Neither the name of Google Inc. nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ */
+
+#import "GRPCCall.h"
+
+// Helpers for setting and reading headers compatible with OAuth2.
+@interface GRPCCall (OAuth2)
+
+// Setting this property is equivalent to setting "Bearer <passed token>" as the value of the
+// request header with key "authorization" (the authorization header). Setting it to nil removes the
+// authorization header from the request.
+// The value obtained by getting the property is the OAuth2 bearer token if the authorization header
+// of the request has the form "Bearer <token>", or nil otherwise.
+@property(atomic, copy) NSString *oauth2AccessToken;
+
+// Returns the value (if any) of the "www-authenticate" response header (the challenge header).
+@property(atomic, readonly) NSString *oauth2ChallengeHeader;
+
+@end
diff --git a/src/objective-c/GRPCClient/GRPCCall+OAuth2.m b/src/objective-c/GRPCClient/GRPCCall+OAuth2.m
new file mode 100644
index 0000000000..ed39d4b0f7
--- /dev/null
+++ b/src/objective-c/GRPCClient/GRPCCall+OAuth2.m
@@ -0,0 +1,63 @@
+/*
+ *
+ * Copyright 2015, Google Inc.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *
+ *     * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above
+ * copyright notice, this list of conditions and the following disclaimer
+ * in the documentation and/or other materials provided with the
+ * distribution.
+ *     * Neither the name of Google Inc. nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ */
+
+#import "GRPCCall+OAuth2.h"
+
+static NSString * const kAuthorizationHeader = @"authorization";
+static NSString * const kBearerPrefix = @"Bearer ";
+static NSString * const kChallengeHeader = @"www-authenticate";
+
+@implementation GRPCCall (OAuth2)
+
+- (NSString *)oauth2AccessToken {
+  NSString *headerValue = self.requestMetadata[kAuthorizationHeader];
+  if ([headerValue hasPrefix:kBearerPrefix]) {
+    return [headerValue substringFromIndex:kBearerPrefix.length];
+  } else {
+    return nil;
+  }
+}
+
+- (void)setOauth2AccessToken:(NSString *)token {
+  if (token) {
+    self.requestMetadata[kAuthorizationHeader] = [kBearerPrefix stringByAppendingString:token];
+  } else {
+    [self.requestMetadata removeObjectForKey:kAuthorizationHeader];
+  }
+}
+
+- (NSString *)oauth2ChallengeHeader {
+  return self.responseMetadata[kChallengeHeader];
+}
+
+@end
diff --git a/src/objective-c/GRPCClient/GRPCCall+Tests.h b/src/objective-c/GRPCClient/GRPCCall+Tests.h
new file mode 100644
index 0000000000..cca1614606
--- /dev/null
+++ b/src/objective-c/GRPCClient/GRPCCall+Tests.h
@@ -0,0 +1,54 @@
+/*
+ *
+ * Copyright 2015, Google Inc.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *
+ *     * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above
+ * copyright notice, this list of conditions and the following disclaimer
+ * in the documentation and/or other materials provided with the
+ * distribution.
+ *     * Neither the name of Google Inc. nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ */
+
+#import "GRPCCall.h"
+
+// Methods to let tune down the security of gRPC connections for specific hosts. These shouldn't be
+// used in releases, but are sometimes needed for testing.
+@interface GRPCCall (Tests)
+
+// Establish all SSL connections to the provided host using the passed SSL target name and the root
+// certificates found in the file at |certsPath|.
+//
+// Must be called before any gRPC call to that host is made. It's illegal to pass the same host to
+// more than one invocation of the methods of this category.
++ (void)useTestCertsPath:(NSString *)certsPath
+                testName:(NSString *)testName
+                 forHost:(NSString *)host;
+
+// Establish all connections to the provided host using cleartext instead of SSL.
+//
+// Must be called before any gRPC call to that host is made. It's illegal to pass the same host to
+// more than one invocation of the methods of this category.
++ (void)useInsecureConnectionsForHost:(NSString *)host;
+@end
diff --git a/src/objective-c/GRPCClient/GRPCCall+Tests.m b/src/objective-c/GRPCClient/GRPCCall+Tests.m
new file mode 100644
index 0000000000..bade0b2920
--- /dev/null
+++ b/src/objective-c/GRPCClient/GRPCCall+Tests.m
@@ -0,0 +1,53 @@
+/*
+ *
+ * Copyright 2015, Google Inc.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *
+ *     * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above
+ * copyright notice, this list of conditions and the following disclaimer
+ * in the documentation and/or other materials provided with the
+ * distribution.
+ *     * Neither the name of Google Inc. nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ */
+
+#import "GRPCCall+Tests.h"
+
+#import "private/GRPCHost.h"
+
+@implementation GRPCCall (Tests)
+
++ (void)useTestCertsPath:(NSString *)certsPath
+                testName:(NSString *)testName
+                 forHost:(NSString *)host {
+  GRPCHost *hostConfig = [GRPCHost hostWithAddress:host];
+  hostConfig.pathToCertificates = certsPath;
+  hostConfig.hostNameOverride = testName;
+}
+
++ (void)useInsecureConnectionsForHost:(NSString *)host {
+  GRPCHost *hostConfig = [GRPCHost hostWithAddress:host];
+  hostConfig.secure = NO;
+}
+
+@end
diff --git a/src/objective-c/GRPCClient/GRPCCall.m b/src/objective-c/GRPCClient/GRPCCall.m
index 9435bf2b35..0f4c811ce4 100644
--- a/src/objective-c/GRPCClient/GRPCCall.m
+++ b/src/objective-c/GRPCClient/GRPCCall.m
@@ -37,8 +37,6 @@
 #include <grpc/support/time.h>
 #import <RxLibrary/GRXConcurrentWriteable.h>
 
-#import "private/GRPCChannel.h"
-#import "private/GRPCCompletionQueue.h"
 #import "private/GRPCWrappedCall.h"
 #import "private/NSData+GRPC.h"
 #import "private/NSDictionary+GRPC.h"
@@ -71,19 +69,25 @@ NSString * const kGRPCStatusMetadataKey = @"io.grpc.StatusMetadataKey";
   GRPCWrappedCall *_wrappedCall;
   dispatch_once_t _callAlreadyInvoked;
 
-  GRPCChannel *_channel;
-  GRPCCompletionQueue *_completionQueue;
-
   // The C gRPC library has less guarantees on the ordering of events than we
   // do. Particularly, in the face of errors, there's no ordering guarantee at
   // all. This wrapper over our actual writeable ensures thread-safety and
   // correct ordering.
   GRXConcurrentWriteable *_responseWriteable;
+
+  // The network thread wants the requestWriter to resume (when the server is ready for more input),
+  // or to stop (on errors), concurrently with user threads that want to start it, pause it or stop
+  // it. Because a writer isn't thread-safe, we'll synchronize those operations on it.
+  // We don't use a dispatch queue for that purpose, because the writer can call writeValue: or
+  // writesFinishedWithError: on this GRPCCall as part of those operations. We want to be able to
+  // pause the writer immediately on writeValue:, so we need our locking to be recursive.
   GRXWriter *_requestWriter;
 
   // To create a retain cycle when a call is started, up until it finishes. See
-  // |startWithWriteable:| and |finishWithError:|.
-  GRPCCall *_self;
+  // |startWithWriteable:| and |finishWithError:|. This saves users from having to retain a
+  // reference to the call object if all they're interested in is the handler being executed when
+  // the response arrives.
+  GRPCCall *_retainSelf;
 
   NSMutableDictionary *_requestMetadata;
   NSMutableDictionary *_responseMetadata;
@@ -100,24 +104,17 @@ NSString * const kGRPCStatusMetadataKey = @"io.grpc.StatusMetadataKey";
                         path:(NSString *)path
               requestsWriter:(GRXWriter *)requestWriter {
   if (!host || !path) {
-    [NSException raise:NSInvalidArgumentException format:@"Neither host nor method can be nil."];
+    [NSException raise:NSInvalidArgumentException format:@"Neither host nor path can be nil."];
   }
   if (requestWriter.state != GRXWriterStateNotStarted) {
-    [NSException raise:NSInvalidArgumentException format:@"The requests writer can't be already started."];
+    [NSException raise:NSInvalidArgumentException
+                format:@"The requests writer can't be already started."];
   }
   if ((self = [super init])) {
-    static dispatch_once_t initialization;
-    dispatch_once(&initialization, ^{
-      grpc_init();
-    });
-
-    _completionQueue = [GRPCCompletionQueue completionQueue];
-
-    _channel = [GRPCChannel channelToHost:host];
-
-    _wrappedCall = [[GRPCWrappedCall alloc] initWithChannel:_channel
-                                                       path:path
-                                                       host:host];
+    _wrappedCall = [[GRPCWrappedCall alloc] initWithHost:host path:path];
+    if (!_wrappedCall) {
+      return nil;
+    }
 
     // Serial queue to invoke the non-reentrant methods of the grpc_call object.
     _callQueue = dispatch_queue_create("org.grpc.call", NULL);
@@ -148,11 +145,12 @@ NSString * const kGRPCStatusMetadataKey = @"io.grpc.StatusMetadataKey";
 
 - (void)finishWithError:(NSError *)errorOrNil {
   // If the call isn't retained anywhere else, it can be deallocated now.
-  _self = nil;
+  _retainSelf = nil;
 
   // If there were still request messages coming, stop them.
-  _requestWriter.state = GRXWriterStateFinished;
-  _requestWriter = nil;
+  @synchronized(_requestWriter) {
+    _requestWriter.state = GRXWriterStateFinished;
+  }
 
   if (errorOrNil) {
     [_responseWriteable cancelWithError:errorOrNil];
@@ -252,12 +250,14 @@ NSString * const kGRPCStatusMetadataKey = @"io.grpc.StatusMetadataKey";
     // Resume the request writer.
     GRPCCall *strongSelf = weakSelf;
     if (strongSelf) {
-      strongSelf->_requestWriter.state = GRXWriterStateStarted;
+      @synchronized(strongSelf->_requestWriter) {
+        strongSelf->_requestWriter.state = GRXWriterStateStarted;
+      }
     }
   };
-  [_wrappedCall startBatchWithOperations:@[[[GRPCOpSendMessage alloc]
-                                            initWithMessage:message
-                                            handler:resumingHandler]] errorHandler:errorHandler];
+  [_wrappedCall startBatchWithOperations:@[[[GRPCOpSendMessage alloc] initWithMessage:message
+                                                                              handler:resumingHandler]]
+                            errorHandler:errorHandler];
 }
 
 - (void)writeValue:(id)value {
@@ -265,7 +265,9 @@ NSString * const kGRPCStatusMetadataKey = @"io.grpc.StatusMetadataKey";
 
   // Pause the input and only resume it when the C layer notifies us that writes
   // can proceed.
-  _requestWriter.state = GRXWriterStatePaused;
+  @synchronized(_requestWriter) {
+    _requestWriter.state = GRXWriterStatePaused;
+  }
 
   __weak GRPCCall *weakSelf = self;
   dispatch_async(_callQueue, ^{
@@ -285,7 +287,6 @@ NSString * const kGRPCStatusMetadataKey = @"io.grpc.StatusMetadataKey";
 }
 
 - (void)writesFinishedWithError:(NSError *)errorOrNil {
-  _requestWriter = nil;
   if (errorOrNil) {
     [self cancel];
   } else {
@@ -339,7 +340,9 @@ NSString * const kGRPCStatusMetadataKey = @"io.grpc.StatusMetadataKey";
     }
   }];
   // Now that the RPC has been initiated, request writes can start.
-  [_requestWriter startWithWriteable:self];
+  @synchronized(_requestWriter) {
+    [_requestWriter startWithWriteable:self];
+  }
 }
 
 #pragma mark GRXWriter implementation
@@ -350,7 +353,7 @@ NSString * const kGRPCStatusMetadataKey = @"io.grpc.StatusMetadataKey";
   // before being autoreleased).
   // Care is taken not to retain self strongly in any of the blocks used in this implementation, so
   // that the life of the instance is determined by this retain cycle.
-  _self = self;
+  _retainSelf = self;
 
   _responseWriteable = [[GRXConcurrentWriteable alloc] initWithWriteable:writeable];
   [self sendHeaders:_requestMetadata];
diff --git a/src/objective-c/GRPCClient/private/GRPCChannel.h b/src/objective-c/GRPCClient/private/GRPCChannel.h
index bc6a47d469..2a7b701576 100644
--- a/src/objective-c/GRPCClient/private/GRPCChannel.h
+++ b/src/objective-c/GRPCClient/private/GRPCChannel.h
@@ -35,17 +35,12 @@
 
 struct grpc_channel;
 
-// Each separate instance of this class represents at least one TCP
-// connection to the provided host. To create a grpc_call, pass the
-// value of the unmanagedChannel property to grpc_channel_create_call.
-// Release this object when the call is finished.
+// Each separate instance of this class represents at least one TCP connection to the provided host.
+// Create them using one of the subclasses |GRPCSecureChannel| and |GRPCUnsecuredChannel|.
 @interface GRPCChannel : NSObject
 @property(nonatomic, readonly) struct grpc_channel *unmanagedChannel;
 
-// Convenience constructor to allow for reuse of connections.
-+ (instancetype)channelToHost:(NSString *)host;
-
-- (instancetype)initWithHost:(NSString *)host NS_DESIGNATED_INITIALIZER;
-
+// This initializer takes ownership of the passed channel, and will destroy it when this object is
+// deallocated. It's illegal to pass the same grpc_channel to two different GRPCChannel objects.
 - (instancetype)initWithChannel:(struct grpc_channel *)unmanagedChannel NS_DESIGNATED_INITIALIZER;
 @end
diff --git a/src/objective-c/GRPCClient/private/GRPCChannel.m b/src/objective-c/GRPCClient/private/GRPCChannel.m
index af4326332f..4366e63320 100644
--- a/src/objective-c/GRPCClient/private/GRPCChannel.m
+++ b/src/objective-c/GRPCClient/private/GRPCChannel.m
@@ -35,53 +35,17 @@
 
 #include <grpc/grpc.h>
 
-#import "GRPCSecureChannel.h"
-#import "GRPCUnsecuredChannel.h"
-
 @implementation GRPCChannel
 
-+ (instancetype)channelToHost:(NSString *)host {
-  // TODO(mlumish): Investigate whether a cache with strong links is a good idea
-  static NSMutableDictionary *channelCache;
-  static dispatch_once_t cacheInitialization;
-  dispatch_once(&cacheInitialization, ^{
-    channelCache = [NSMutableDictionary dictionary];
-  });
-  GRPCChannel *channel = channelCache[host];
-  if (!channel) {
-    channel = [[self alloc] initWithHost:host];
-    channelCache[host] = channel;
-  }
-  return channel;
-}
-
 - (instancetype)init {
-  return [self initWithHost:nil];
+  return [self initWithChannel:NULL];
 }
 
-- (instancetype)initWithHost:(NSString *)host {
-  if (![host rangeOfString:@"://"].length) {
-    // No scheme provided; assume https.
-    host = [@"https://" stringByAppendingString:host];
-  }
-  NSURL *hostURL = [NSURL URLWithString:host];
-  if (!hostURL) {
-    [NSException raise:NSInvalidArgumentException format:@"Invalid URL: %@", host];
+// Designated initializer
+- (instancetype)initWithChannel:(grpc_channel *)unmanagedChannel {
+  if (!unmanagedChannel) {
+    return nil;
   }
-  if ([hostURL.scheme isEqualToString:@"https"]) {
-    host = [@[hostURL.host, hostURL.port ?: @443] componentsJoinedByString:@":"];
-    return [[GRPCSecureChannel alloc] initWithHost:host];
-  }
-  if ([hostURL.scheme isEqualToString:@"http"]) {
-    host = [@[hostURL.host, hostURL.port ?: @80] componentsJoinedByString:@":"];
-    return [[GRPCUnsecuredChannel alloc] initWithHost:host];
-  }
-  [NSException raise:NSInvalidArgumentException
-              format:@"URL scheme %@ isn't supported.", hostURL.scheme];
-  return nil; // silence warning.
-}
-
-- (instancetype)initWithChannel:(struct grpc_channel *)unmanagedChannel {
   if ((self = [super init])) {
     _unmanagedChannel = unmanagedChannel;
   }
@@ -89,12 +53,8 @@
 }
 
 - (void)dealloc {
-  // _unmanagedChannel is NULL when deallocating an object of the base class (because the
-  // initializer returns a different object).
-  if (_unmanagedChannel) {
-    // TODO(jcanizales): Be sure to add a test with a server that closes the connection prematurely,
-    // as in the past that made this call to crash.
-    grpc_channel_destroy(_unmanagedChannel);
-  }
+  // TODO(jcanizales): Be sure to add a test with a server that closes the connection prematurely,
+  // as in the past that made this call to crash.
+  grpc_channel_destroy(_unmanagedChannel);
 }
 @end
diff --git a/src/objective-c/GRPCClient/private/GRPCCompletionQueue.h b/src/objective-c/GRPCClient/private/GRPCCompletionQueue.h
index 603bf01939..ab8d714d22 100644
--- a/src/objective-c/GRPCClient/private/GRPCCompletionQueue.h
+++ b/src/objective-c/GRPCClient/private/GRPCCompletionQueue.h
@@ -36,15 +36,15 @@
 
 typedef void(^GRPCQueueCompletionHandler)(bool success);
 
-// This class lets one more easily use grpc_completion_queue. To use it, pass
-// the value of the unmanagedQueue property of an instance of this class to
-// grpc_call_start_invoke. Then for every grpc_call_* method that accepts a tag,
-// you can pass a block of type GRPCEventHandler (remembering to cast it using
-// __bridge_retained). The block is guaranteed to eventually be called, by a
-// concurrent queue, and then released. Each such block is passed a pointer to
-// the grpc_event that carried it (in event->tag).
-// Release the GRPCCompletionQueue object only after you are not going to pass
-// any more blocks to the grpc_call that's using it.
+// This class lets one more easily use |grpc_completion_queue|. To use it, pass the value of the
+// |unmanagedQueue| property of an instance of this class to |grpc_channel_create_call|. Then for
+// every |grpc_call_*| method that accepts a tag, you can pass a block of type
+// |GRPCQueueCompletionHandler| (remembering to cast it using |__bridge_retained|). The block is
+// guaranteed to eventually be called, by a concurrent queue, and then released. Each such block is
+// passed a |bool| that tells if the operation was successful.
+//
+// Release the GRPCCompletionQueue object only after you are not going to pass any more blocks to
+// the |grpc_call| that's using it.
 @interface GRPCCompletionQueue : NSObject
 @property(nonatomic, readonly) grpc_completion_queue *unmanagedQueue;
 
diff --git a/src/objective-c/GRPCClient/private/GRPCCompletionQueue.m b/src/objective-c/GRPCClient/private/GRPCCompletionQueue.m
index 12535c9616..696069c200 100644
--- a/src/objective-c/GRPCClient/private/GRPCCompletionQueue.m
+++ b/src/objective-c/GRPCClient/private/GRPCCompletionQueue.m
@@ -38,8 +38,6 @@
 @implementation GRPCCompletionQueue
 
 + (instancetype)completionQueue {
-  // TODO(jcanizales): Reuse completion queues to consume only one thread,
-  // instead of one per call.
   return [[self alloc] init];
 }
 
diff --git a/src/objective-c/GRPCClient/private/GRPCHost.h b/src/objective-c/GRPCClient/private/GRPCHost.h
new file mode 100644
index 0000000000..f0bbd53023
--- /dev/null
+++ b/src/objective-c/GRPCClient/private/GRPCHost.h
@@ -0,0 +1,58 @@
+/*
+ *
+ * Copyright 2015, Google Inc.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *
+ *     * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above
+ * copyright notice, this list of conditions and the following disclaimer
+ * in the documentation and/or other materials provided with the
+ * distribution.
+ *     * Neither the name of Google Inc. nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ */
+
+#import <Foundation/Foundation.h>
+
+@class GRPCCompletionQueue;
+struct grpc_call;
+
+@interface GRPCHost : NSObject
+
+@property(nonatomic, readonly) NSString *address;
+
+// The following properties should only be modified for testing:
+
+@property(nonatomic, getter=isSecure) BOOL secure;
+
+@property(nonatomic, copy) NSString *pathToCertificates;
+@property(nonatomic, copy) NSString *hostNameOverride;
+
+// Host objects initialized with the same address are the same.
++ (instancetype)hostWithAddress:(NSString *)address;
+- (instancetype)initWithAddress:(NSString *)address NS_DESIGNATED_INITIALIZER;
+
+// Create a grpc_call object to the provided path on this host.
+- (struct grpc_call *)unmanagedCallWithPath:(NSString *)path
+                            completionQueue:(GRPCCompletionQueue *)queue;
+
+@end
diff --git a/src/objective-c/GRPCClient/private/GRPCHost.m b/src/objective-c/GRPCClient/private/GRPCHost.m
new file mode 100644
index 0000000000..d902f95b51
--- /dev/null
+++ b/src/objective-c/GRPCClient/private/GRPCHost.m
@@ -0,0 +1,126 @@
+/*
+ *
+ * Copyright 2015, Google Inc.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *
+ *     * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above
+ * copyright notice, this list of conditions and the following disclaimer
+ * in the documentation and/or other materials provided with the
+ * distribution.
+ *     * Neither the name of Google Inc. nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ */
+
+#import "GRPCHost.h"
+
+#include <grpc/grpc.h>
+
+#import "GRPCChannel.h"
+#import "GRPCCompletionQueue.h"
+#import "GRPCSecureChannel.h"
+#import "GRPCUnsecuredChannel.h"
+
+@interface GRPCHost ()
+// TODO(mlumish): Investigate whether caching channels with strong links is a good idea.
+@property(nonatomic, strong) GRPCChannel *channel;
+@end
+
+@implementation GRPCHost
+
++ (instancetype)hostWithAddress:(NSString *)address {
+  return [[self alloc] initWithAddress:address];
+}
+
+- (instancetype)init {
+  return [self initWithAddress:nil];
+}
+
+// Default initializer.
+- (instancetype)initWithAddress:(NSString *)address {
+
+  // To provide a default port, we try to interpret the address. If it's just a host name without
+  // scheme and without port, we'll use port 443. If it has a scheme, we pass it untouched to the C
+  // gRPC library.
+  // TODO(jcanizales): Add unit tests for the types of addresses we want to let pass untouched.
+  NSURL *hostURL = [NSURL URLWithString:[@"https://" stringByAppendingString:address]];
+  if (hostURL && !hostURL.port) {
+    address = [hostURL.host stringByAppendingString:@":443"];
+  }
+
+  // Look up the GRPCHost in the cache.
+  static NSMutableDictionary *hostCache;
+  static dispatch_once_t cacheInitialization;
+  dispatch_once(&cacheInitialization, ^{
+    hostCache = [NSMutableDictionary dictionary];
+  });
+  @synchronized(hostCache) {
+    GRPCHost *cachedHost = hostCache[address];
+    if (cachedHost) {
+      return cachedHost;
+    }
+
+    if ((self = [super init])) {
+      _address = address;
+      _secure = YES;
+      hostCache[address] = self;
+    }
+  }
+  return self;
+}
+
+- (grpc_call *)unmanagedCallWithPath:(NSString *)path completionQueue:(GRPCCompletionQueue *)queue {
+  if (!queue || !path || !self.channel) {
+    return NULL;
+  }
+  return grpc_channel_create_call(self.channel.unmanagedChannel,
+                                  NULL, GRPC_PROPAGATE_DEFAULTS,
+                                  queue.unmanagedQueue,
+                                  path.UTF8String,
+                                  self.hostName.UTF8String,
+                                  gpr_inf_future(GPR_CLOCK_REALTIME));
+}
+
+- (GRPCChannel *)channel {
+  // Create it lazily, because we don't want to open a connection just because someone is
+  // configuring a host.
+  if (!_channel) {
+    if (_secure) {
+      _channel = [[GRPCSecureChannel alloc] initWithHost:_address
+                                      pathToCertificates:_pathToCertificates
+                                        hostNameOverride:_hostNameOverride];
+    } else {
+      _channel = [[GRPCUnsecuredChannel alloc] initWithHost:_address];
+    }
+  }
+  return _channel;
+}
+
+- (NSString *)hostName {
+  // TODO(jcanizales): Default to nil instead of _address when Issue #2635 is clarified.
+  return _hostNameOverride ?: _address;
+}
+
+// TODO(jcanizales): Don't let set |secure| to |NO| if |pathToCertificates| or |hostNameOverride|
+// have been set. Don't let set either of the latter if |secure| has been set to |NO|.
+
+@end
diff --git a/src/objective-c/GRPCClient/private/GRPCSecureChannel.h b/src/objective-c/GRPCClient/private/GRPCSecureChannel.h
index d34ceaea0c..74257eb058 100644
--- a/src/objective-c/GRPCClient/private/GRPCSecureChannel.h
+++ b/src/objective-c/GRPCClient/private/GRPCSecureChannel.h
@@ -31,8 +31,23 @@
  *
  */
 
+#include <grpc/grpc.h>
+
 #import "GRPCChannel.h"
 
+struct grpc_credentials;
+
 @interface GRPCSecureChannel : GRPCChannel
+- (instancetype)initWithHost:(NSString *)host;
+
+// Only in tests shouldn't pathToCertificates or hostNameOverride be nil. Passing nil for
+// pathToCertificates results in using the default root certificates distributed with the library.
+- (instancetype)initWithHost:(NSString *)host
+          pathToCertificates:(NSString *)path
+            hostNameOverride:(NSString *)hostNameOverride;
 
+// The passed arguments aren't required to be valid beyond the invocation of this initializer.
+- (instancetype)initWithHost:(NSString *)host
+                 credentials:(struct grpc_credentials *)credentials
+                        args:(grpc_channel_args *)args NS_DESIGNATED_INITIALIZER;
 @end
diff --git a/src/objective-c/GRPCClient/private/GRPCSecureChannel.m b/src/objective-c/GRPCClient/private/GRPCSecureChannel.m
index 43a8bd539e..9b4b6768f8 100644
--- a/src/objective-c/GRPCClient/private/GRPCSecureChannel.m
+++ b/src/objective-c/GRPCClient/private/GRPCSecureChannel.m
@@ -33,28 +33,80 @@
 
 #import "GRPCSecureChannel.h"
 
-#import <grpc/grpc_security.h>
+#include <grpc/grpc_security.h>
+
+// Returns NULL if the file at path couldn't be read. In that case, if errorPtr isn't NULL,
+// *errorPtr will be an object describing what went wrong.
+static grpc_credentials *CertificatesAtPath(NSString *path, NSError **errorPtr) {
+  NSString *certsContent = [NSString stringWithContentsOfFile:path
+                                                     encoding:NSASCIIStringEncoding
+                                                        error:errorPtr];
+  if (!certsContent) {
+    // Passing NULL to grpc_ssl_credentials_create produces behavior we don't want, so return.
+    return NULL;
+  }
+  const char * asCString = [certsContent cStringUsingEncoding:NSASCIIStringEncoding];
+  return grpc_ssl_credentials_create(asCString, NULL);
+}
 
 @implementation GRPCSecureChannel
 
 - (instancetype)initWithHost:(NSString *)host {
-  static grpc_credentials *kCredentials;
+  return [self initWithHost:host pathToCertificates:nil hostNameOverride:nil];
+}
+
+- (instancetype)initWithHost:(NSString *)host
+          pathToCertificates:(NSString *)path
+            hostNameOverride:(NSString *)hostNameOverride {
+  // Load default SSL certificates once.
+  static grpc_credentials *kDefaultCertificates;
   static dispatch_once_t loading;
   dispatch_once(&loading, ^{
+    NSString *defaultPath = @"gRPCCertificates.bundle/roots"; // .pem
     // Do not use NSBundle.mainBundle, as it's nil for tests of library projects.
     NSBundle *bundle = [NSBundle bundleForClass:self.class];
-    NSString *certsPath = [bundle pathForResource:@"gRPCCertificates.bundle/roots" ofType:@"pem"];
-    NSAssert(certsPath.length,
-             @"gRPCCertificates.bundle/roots.pem not found under %@. This file, with the root "
-             "certificates, is needed to establish TLS (HTTPS) connections.", bundle.bundlePath);
-    NSData *certsData = [NSData dataWithContentsOfFile:certsPath];
-    NSAssert(certsData.length, @"No data read from %@", certsPath);
-    NSString *certsString = [[NSString alloc] initWithData:certsData encoding:NSUTF8StringEncoding];
-    kCredentials = grpc_ssl_credentials_create(certsString.UTF8String, NULL);
+    NSString *path = [bundle pathForResource:defaultPath ofType:@"pem"];
+    NSError *error;
+    kDefaultCertificates = CertificatesAtPath(path, &error);
+    NSAssert(kDefaultCertificates, @"Could not read %@/%@.pem. This file, with the root "
+             "certificates, is needed to establish secure (TLS) connections. Because the file is "
+             "distributed with the gRPC library, this error is usually a sign that the library "
+             "wasn't configured correctly for your project. Error: %@",
+             bundle.bundlePath, defaultPath, error);
   });
-  return (self = [super initWithChannel:grpc_secure_channel_create(kCredentials,
-                                                                   host.UTF8String,
-                                                                   NULL)]);
+
+  //TODO(jcanizales): Add NSError** parameter to the initializer.
+  grpc_credentials *certificates = path ? CertificatesAtPath(path, NULL) : kDefaultCertificates;
+  if (!certificates) {
+    return nil;
+  }
+
+  // Ritual to pass the SSL host name override to the C library.
+  grpc_channel_args channelArgs;
+  grpc_arg nameOverrideArg;
+  channelArgs.num_args = 1;
+  channelArgs.args = &nameOverrideArg;
+  nameOverrideArg.type = GRPC_ARG_STRING;
+  nameOverrideArg.key = GRPC_SSL_TARGET_NAME_OVERRIDE_ARG;
+  // Cast const away. Hope C gRPC doesn't modify it!
+  nameOverrideArg.value.string = (char *) hostNameOverride.UTF8String;
+  grpc_channel_args *args = hostNameOverride ? &channelArgs : NULL;
+
+  return [self initWithHost:host credentials:certificates args:args];
+}
+
+- (instancetype)initWithHost:(NSString *)host
+                 credentials:(grpc_credentials *)credentials
+                        args:(grpc_channel_args *)args {
+  return (self =
+          [super initWithChannel:grpc_secure_channel_create(credentials, host.UTF8String, args)]);
+}
+
+// TODO(jcanizales): GRPCSecureChannel and GRPCUnsecuredChannel are just convenience initializers
+// for GRPCChannel. Move them into GRPCChannel, which will make the following unnecessary.
+- (instancetype)initWithChannel:(grpc_channel *)unmanagedChannel {
+  [NSException raise:NSInternalInconsistencyException format:@"use another initializer"];
+  return [self initWithHost:nil]; // silence warnings
 }
 
 @end
diff --git a/src/objective-c/GRPCClient/private/GRPCUnsecuredChannel.h b/src/objective-c/GRPCClient/private/GRPCUnsecuredChannel.h
index 9d89cfb541..8528be44c0 100644
--- a/src/objective-c/GRPCClient/private/GRPCUnsecuredChannel.h
+++ b/src/objective-c/GRPCClient/private/GRPCUnsecuredChannel.h
@@ -34,5 +34,5 @@
 #import "GRPCChannel.h"
 
 @interface GRPCUnsecuredChannel : GRPCChannel
-
+- (instancetype)initWithHost:(NSString *)host NS_DESIGNATED_INITIALIZER;
 @end
diff --git a/src/objective-c/GRPCClient/private/GRPCUnsecuredChannel.m b/src/objective-c/GRPCClient/private/GRPCUnsecuredChannel.m
index d27f7ca565..070a529629 100644
--- a/src/objective-c/GRPCClient/private/GRPCUnsecuredChannel.m
+++ b/src/objective-c/GRPCClient/private/GRPCUnsecuredChannel.m
@@ -38,7 +38,13 @@
 @implementation GRPCUnsecuredChannel
 
 - (instancetype)initWithHost:(NSString *)host {
-  return (self = [super initWithChannel:grpc_channel_create(host.UTF8String, NULL)]);
+  return (self = [super initWithChannel:grpc_insecure_channel_create(host.UTF8String, NULL)]);
 }
 
+// TODO(jcanizales): GRPCSecureChannel and GRPCUnsecuredChannel are just convenience initializers
+// for GRPCChannel. Move them into GRPCChannel, which will make the following unnecessary.
+- (instancetype)initWithChannel:(grpc_channel *)unmanagedChannel {
+  [NSException raise:NSInternalInconsistencyException format:@"use the other initializer"];
+  return [self initWithHost:nil]; // silence warnings
+}
 @end
diff --git a/src/objective-c/GRPCClient/private/GRPCWrappedCall.h b/src/objective-c/GRPCClient/private/GRPCWrappedCall.h
index 18f8bb5531..da11cbb761 100644
--- a/src/objective-c/GRPCClient/private/GRPCWrappedCall.h
+++ b/src/objective-c/GRPCClient/private/GRPCWrappedCall.h
@@ -81,11 +81,12 @@
 
 @end
 
+#pragma mark GRPCWrappedCall
+
 @interface GRPCWrappedCall : NSObject
 
-- (instancetype)initWithChannel:(GRPCChannel *)channel
-                           path:(NSString *)path
-                           host:(NSString *)host NS_DESIGNATED_INITIALIZER;
+- (instancetype)initWithHost:(NSString *)host
+                        path:(NSString *)path NS_DESIGNATED_INITIALIZER;
 
 - (void)startBatchWithOperations:(NSArray *)ops errorHandler:(void(^)())errorHandler;
 
diff --git a/src/objective-c/GRPCClient/private/GRPCWrappedCall.m b/src/objective-c/GRPCClient/private/GRPCWrappedCall.m
index 1db63df77f..951c051036 100644
--- a/src/objective-c/GRPCClient/private/GRPCWrappedCall.m
+++ b/src/objective-c/GRPCClient/private/GRPCWrappedCall.m
@@ -32,11 +32,14 @@
  */
 
 #import "GRPCWrappedCall.h"
+
 #import <Foundation/Foundation.h>
 #include <grpc/grpc.h>
 #include <grpc/byte_buffer.h>
 #include <grpc/support/alloc.h>
+
 #import "GRPCCompletionQueue.h"
+#import "GRPCHost.h"
 #import "NSDictionary+GRPC.h"
 #import "NSData+GRPC.h"
 #import "NSError+GRPC.h"
@@ -219,38 +222,36 @@
 
 @end
 
-@implementation GRPCWrappedCall{
-  grpc_call *_call;
+#pragma mark GRPCWrappedCall
+
+@implementation GRPCWrappedCall {
   GRPCCompletionQueue *_queue;
+  grpc_call *_call;
 }
 
 - (instancetype)init {
-  return [self initWithChannel:nil path:nil host:nil];
+  return [self initWithHost:nil path:nil];
 }
 
-- (instancetype)initWithChannel:(GRPCChannel *)channel
-                           path:(NSString *)path
-                           host:(NSString *)host {
-  if (!channel || !path || !host) {
+- (instancetype)initWithHost:(NSString *)host
+                        path:(NSString *)path {
+  if (!path || !host) {
     [NSException raise:NSInvalidArgumentException
-                format:@"channel, method, and host cannot be nil."];
+                format:@"path and host cannot be nil."];
   }
-  
+
   if (self = [super init]) {
     static dispatch_once_t initialization;
     dispatch_once(&initialization, ^{
       grpc_init();
     });
-    
+
+    // Each completion queue consumes one thread. There's a trade to be made between creating and
+    // consuming too many threads and having contention of multiple calls in a single completion
+    // queue. Currently we favor latency and use one per call.
     _queue = [GRPCCompletionQueue completionQueue];
-    if (!_queue) {
-      return nil;
-    }
-    _call = grpc_channel_create_call(channel.unmanagedChannel,
-                                     _queue.unmanagedQueue,
-                                     path.UTF8String,
-                                     host.UTF8String,
-                                     gpr_inf_future(GPR_CLOCK_REALTIME));
+
+    _call = [[GRPCHost hostWithAddress:host] unmanagedCallWithPath:path completionQueue:_queue];
     if (_call == NULL) {
       return nil;
     }
@@ -299,4 +300,4 @@
   grpc_call_destroy(_call);
 }
 
-@end
\ No newline at end of file
+@end
diff --git a/src/objective-c/RxLibrary/GRXBufferedPipe.h b/src/objective-c/RxLibrary/GRXBufferedPipe.h
index b6296e1ed7..ca94ce275f 100644
--- a/src/objective-c/RxLibrary/GRXBufferedPipe.h
+++ b/src/objective-c/RxLibrary/GRXBufferedPipe.h
@@ -36,13 +36,11 @@
 #import "GRXWriteable.h"
 #import "GRXWriter.h"
 
-// A buffered pipe is a Writeable that also acts as a Writer (to whichever other writeable is passed
-// to -startWithWriteable:).
+// A buffered pipe is a Writer that also acts as a Writeable.
 // Once it is started, whatever values are written into it (via -writeValue:) will be propagated
 // immediately, unless flow control prevents it.
 // If it is throttled and keeps receiving values, as well as if it receives values before being
-// started, it will buffer them and propagate them in order as soon as its state becomes
-// GRXWriterStateStarted.
+// started, it will buffer them and propagate them in order as soon as its state becomes Started.
 // If it receives an error (via -writesFinishedWithError:), it will drop any buffered values and
 // propagate the error immediately.
 //
@@ -51,6 +49,9 @@
 // pipe will keep buffering all data written to it, your application could run out of memory and
 // crash. If you want to react to flow control signals to prevent that, instead of using this class
 // you can implement an object that conforms to GRXWriter.
+//
+// Thread-safety:
+// The methods of an object of this class should not be called concurrently from different threads.
 @interface GRXBufferedPipe : GRXWriter<GRXWriteable>
 
 // Convenience constructor.
diff --git a/src/objective-c/RxLibrary/GRXForwardingWriter.h b/src/objective-c/RxLibrary/GRXForwardingWriter.h
index d004333d2b..f310832284 100644
--- a/src/objective-c/RxLibrary/GRXForwardingWriter.h
+++ b/src/objective-c/RxLibrary/GRXForwardingWriter.h
@@ -33,11 +33,17 @@
 
 #import "GRXWriter.h"
 
-// A "proxy" class that simply forwards values, completion, and errors from its
-// input writer to its writeable.
+// A "proxy" class that simply forwards values, completion, and errors from its input writer to its
+// writeable.
 // It is useful as a superclass for pipes that act as a transformation of their
 // input writer, and for classes that represent objects with input and
 // output sequences of values, like an RPC.
+//
+// Thread-safety:
+// All messages sent to this object need to be serialized. When it is started, the writer it wraps
+// is started in the same thread. Manual state changes are propagated to the wrapped writer in the
+// same thread too. Importantly, all messages the wrapped writer sends to its writeable need to be
+// serialized with any message sent to this object.
 @interface GRXForwardingWriter : GRXWriter
 - (instancetype)initWithWriter:(GRXWriter *)writer NS_DESIGNATED_INITIALIZER;
 @end
diff --git a/src/objective-c/RxLibrary/GRXForwardingWriter.m b/src/objective-c/RxLibrary/GRXForwardingWriter.m
index 2342f51ab3..a72be9ace2 100644
--- a/src/objective-c/RxLibrary/GRXForwardingWriter.m
+++ b/src/objective-c/RxLibrary/GRXForwardingWriter.m
@@ -48,7 +48,11 @@
 // Designated initializer
 - (instancetype)initWithWriter:(GRXWriter *)writer {
   if (!writer) {
-    [NSException raise:NSInvalidArgumentException format:@"writer can't be nil."];
+    return nil;
+  }
+  if (writer.state != GRXWriterStateNotStarted) {
+    [NSException raise:NSInvalidArgumentException
+                format:@"The writer argument must not have already started."];
   }
   if ((self = [super init])) {
     _writer = writer;
diff --git a/src/objective-c/RxLibrary/GRXImmediateWriter.h b/src/objective-c/RxLibrary/GRXImmediateWriter.h
index b171f0c760..3fcc259434 100644
--- a/src/objective-c/RxLibrary/GRXImmediateWriter.h
+++ b/src/objective-c/RxLibrary/GRXImmediateWriter.h
@@ -36,10 +36,17 @@
 #import "GRXWriter.h"
 
 // Utility to construct GRXWriter instances from values that are immediately available when
-// required. The returned writers all support pausing and early termination.
+// required.
 //
-// Unless the writeable callback pauses them or stops them early, these writers will do all their
-// interactions with the writeable before the start method returns.
+// Thread-safety:
+//
+// An object of this class shouldn't be messaged concurrently by more than one thread. It will start
+// messaging the writeable before |startWithWriteable:| returns, in the same thread. That is the
+// only place where the writer can be paused or stopped prematurely.
+//
+// If a paused writer of this class is resumed, it will start messaging the writeable, in the same
+// thread, before |setState:| returns. Because the object can't be legally accessed concurrently,
+// that's the only place where it can be paused again (or stopped).
 @interface GRXImmediateWriter : GRXWriter
 
 // Returns a writer that pulls values from the passed NSEnumerator instance and pushes them to
diff --git a/src/objective-c/RxLibrary/GRXWriter.h b/src/objective-c/RxLibrary/GRXWriter.h
index 5d6e1a472a..b1c994aa38 100644
--- a/src/objective-c/RxLibrary/GRXWriter.h
+++ b/src/objective-c/RxLibrary/GRXWriter.h
@@ -35,84 +35,73 @@
 
 #import "GRXWriteable.h"
 
+// States of a writer.
 typedef NS_ENUM(NSInteger, GRXWriterState) {
 
-  // The writer has not yet been given a writeable to which it can push its
-  // values. To have an writer transition to the Started state, send it a
-  // startWithWriteable: message.
+  // The writer has not yet been given a writeable to which it can push its values. To have a writer
+  // transition to the Started state, send it a startWithWriteable: message.
   //
-  // An writer's state cannot be manually set to this value.
+  // A writer's state cannot be manually set to this value.
   GRXWriterStateNotStarted,
 
   // The writer might push values to the writeable at any moment.
   GRXWriterStateStarted,
 
-  // The writer is temporarily paused, and won't send any more values to the
-  // writeable unless its state is set back to Started. The writer might still
-  // transition to the Finished state at any moment, and is allowed to send
-  // writesFinishedWithError: to its writeable.
-  //
-  // Not all implementations of writer have to support pausing, and thus
-  // trying to set an writer's state to this value might have no effect.
+  // The writer is temporarily paused, and won't send any more values to the writeable unless its
+  // state is set back to Started. The writer might still transition to the Finished state at any
+  // moment, and is allowed to send writesFinishedWithError: to its writeable.
   GRXWriterStatePaused,
 
   // The writer has released its writeable and won't interact with it anymore.
   //
-  // One seldomly wants to set an writer's state to this value, as its
-  // writeable isn't notified with a writesFinishedWithError: message. Instead, sending
-  // finishWithError: to the writer will make it notify the writeable and then
-  // transition to this state.
+  // One seldomly wants to set a writer's state to this value, as its writeable isn't notified with
+  // a writesFinishedWithError: message. Instead, sending finishWithError: to the writer will make
+  // it notify the writeable and then transition to this state.
   GRXWriterStateFinished
 };
 
-// An object that conforms to this protocol can produce, on demand, a sequence
-// of values. The sequence may be produced asynchronously, and it may consist of
-// any number of elements, including none or an infinite number.
+// An GRXWriter object can produce, on demand, a sequence of values. The sequence may be produced
+// asynchronously, and it may consist of any number of elements, including none or an infinite
+// number.
+//
+// GRXWriter is the active dual of NSEnumerator. The difference between them is thus whether the
+// object plays an active or passive role during usage: A user of NSEnumerator pulls values off it,
+// and passes the values to a writeable. A user of GRXWriter, though, just gives it a writeable, and
+// the GRXWriter instance pushes values to the writeable. This makes this protocol suitable to
+// represent a sequence of future values, as well as collections with internal iteration.
 //
-// GRXWriter is the active dual of NSEnumerator. The difference between them
-// is thus whether the object plays an active or passive role during usage: A
-// user of NSEnumerator pulls values off it, and passes the values to a writeable.
-// A user of GRXWriter, though, just gives it a writeable, and the
-// GRXWriter instance pushes values to the writeable. This makes this protocol
-// suitable to represent a sequence of future values, as well as collections
-// with internal iteration.
+// An instance of GRXWriter can start producing values after a writeable is passed to it. It can
+// also be commanded to finish the sequence immediately (with an optional error). Finally, it can be
+// asked to pause, and resumed later. All GRXWriter objects support pausing and early termination.
 //
-// An instance of GRXWriter can start producing values after a writeable is
-// passed to it. It can also be commanded to finish the sequence immediately
-// (with an optional error). Finally, it can be asked to pause, but the
-// conforming instance is not required to oblige.
+// Thread-safety:
 //
-// Unless otherwise indicated by a conforming class, no messages should be sent
-// concurrently to a GRXWriter. I.e., conforming classes aren't required to
-// be thread-safe.
+// State transitions take immediate effect if the object is used from a single thread. Subclasses
+// might offer stronger guarantees.
+//
+// Unless otherwise indicated by a conforming subclass, no messages should be sent concurrently to a
+// GRXWriter. I.e., conforming classes aren't required to be thread-safe.
 @interface GRXWriter : NSObject
 
-// This property can be used to query the current state of the writer, which
-// determines how it might currently use its writeable. Some state transitions can
-// be triggered by setting this property to the corresponding value, and that's
-// useful for advanced use cases like pausing an writer. For more details,
-// see the documentation of the enum.
+// This property can be used to query the current state of the writer, which determines how it might
+// currently use its writeable. Some state transitions can be triggered by setting this property to
+// the corresponding value, and that's useful for advanced use cases like pausing an writer. For
+// more details, see the documentation of the enum further down.
 @property(nonatomic) GRXWriterState state;
 
-// Start sending messages to the writeable. Messages may be sent before the method
-// returns, or they may be sent later in the future. See GRXWriteable.h for the
-// different messages a writeable can receive.
+// Transition to the Started state, and start sending messages to the writeable (a reference to it
+// is retained). Messages to the writeable may be sent before the method returns, or they may be
+// sent later in the future. See GRXWriteable.h for the different messages a writeable can receive.
 //
-// If this writer draws its values from an external source (e.g. from the
-// filesystem or from a server), calling this method will commonly trigger side
-// effects (like network connections).
+// If this writer draws its values from an external source (e.g. from the filesystem or from a
+// server), calling this method will commonly trigger side effects (like network connections).
 //
 // This method might only be called on writers in the NotStarted state.
 - (void)startWithWriteable:(id<GRXWriteable>)writeable;
 
-// Send writesFinishedWithError:errorOrNil immediately to the writeable, and don't send
-// any more messages to it.
-//
-// This method might only be called on writers in the Started or Paused
-// state.
+// Send writesFinishedWithError:errorOrNil to the writeable. Then release the reference to it and
+// transition to the Finished state.
 //
-// TODO(jcanizales): Consider adding some guarantee about the immediacy of that
-// stopping. I know I've relied on it in part of the code that uses this, but
-// can't remember the details in the presence of concurrency.
+// This method might only be called on writers in the Started or Paused state.
 - (void)finishWithError:(NSError *)errorOrNil;
 @end
diff --git a/src/objective-c/generated_libraries/RemoteTestClient/RemoteTest.podspec b/src/objective-c/generated_libraries/RemoteTestClient/RemoteTest.podspec
index 7cc9a040fe..8710753e59 100644
--- a/src/objective-c/generated_libraries/RemoteTestClient/RemoteTest.podspec
+++ b/src/objective-c/generated_libraries/RemoteTestClient/RemoteTest.podspec
@@ -8,11 +8,10 @@ Pod::Spec.new do |s|
 
   # Run protoc with the Objective-C and gRPC plugins to generate protocol messages and gRPC clients.
   s.prepare_command = <<-CMD
-    cd ../../../..
-    # TODO(jcanizales): Make only Objective-C plugin.
-    make plugins
-    cd -
-    protoc --plugin=protoc-gen-grpc=../../../../bins/opt/grpc_objective_c_plugin --objc_out=. --grpc_out=. *.proto
+    BINDIR=../../../../bins/$CONFIG
+    PROTOC=$BINDIR/protobuf/protoc
+    PLUGIN=$BINDIR/grpc_objective_c_plugin
+    $PROTOC --plugin=protoc-gen-grpc=$PLUGIN --objc_out=. --grpc_out=. *.proto
   CMD
 
   s.subspec "Messages" do |ms|
diff --git a/src/objective-c/generated_libraries/RouteGuideClient/RouteGuide.podspec b/src/objective-c/generated_libraries/RouteGuideClient/RouteGuide.podspec
index 0e8dacd1c4..23ccffe69d 100644
--- a/src/objective-c/generated_libraries/RouteGuideClient/RouteGuide.podspec
+++ b/src/objective-c/generated_libraries/RouteGuideClient/RouteGuide.podspec
@@ -8,11 +8,10 @@ Pod::Spec.new do |s|
 
   # Run protoc with the Objective-C and gRPC plugins to generate protocol messages and gRPC clients.
   s.prepare_command = <<-CMD
-    cd ../../../..
-    # TODO(jcanizales): Make only Objective-C plugin.
-    make plugins
-    cd -
-    protoc --plugin=protoc-gen-grpc=../../../../bins/opt/grpc_objective_c_plugin --objc_out=. --grpc_out=. *.proto
+    BINDIR=../../../../bins/$CONFIG
+    PROTOC=$BINDIR/protobuf/protoc
+    PLUGIN=$BINDIR/grpc_objective_c_plugin
+    $PROTOC --plugin=protoc-gen-grpc=$PLUGIN --objc_out=. --grpc_out=. *.proto
   CMD
 
   s.subspec "Messages" do |ms|
diff --git a/src/objective-c/tests/GRPCClientTests.m b/src/objective-c/tests/GRPCClientTests.m
index 3210ad7050..e85dd6e65c 100644
--- a/src/objective-c/tests/GRPCClientTests.m
+++ b/src/objective-c/tests/GRPCClientTests.m
@@ -35,6 +35,8 @@
 #import <XCTest/XCTest.h>
 
 #import <GRPCClient/GRPCCall.h>
+#import <GRPCClient/GRPCCall+OAuth2.h>
+#import <GRPCClient/GRPCCall+Tests.h>
 #import <ProtoRPC/ProtoMethod.h>
 #import <RemoteTest/Messages.pbobjc.h>
 #import <RxLibrary/GRXWriteable.h>
@@ -43,7 +45,7 @@
 // These are a few tests similar to InteropTests, but which use the generic gRPC client (GRPCCall)
 // rather than a generated proto library on top of it.
 
-static NSString * const kHostAddress = @"grpc-test.sandbox.google.com";
+static NSString * const kHostAddress = @"localhost:5050";
 static NSString * const kPackage = @"grpc.testing";
 static NSString * const kService = @"TestService";
 
@@ -57,6 +59,9 @@ static ProtoMethod *kUnaryCallMethod;
 @implementation GRPCClientTests
 
 - (void)setUp {
+  // Register test server as non-SSL.
+  [GRPCCall useInsecureConnectionsForHost:kHostAddress];
+
   // This method isn't implemented by the remote server.
   kInexistentMethod = [[ProtoMethod alloc] initWithPackage:kPackage
                                                    service:kService
@@ -156,7 +161,7 @@ static ProtoMethod *kUnaryCallMethod;
                                              path:kUnaryCallMethod.HTTPPath
                                    requestsWriter:requestsWriter];
 
-  call.requestMetadata[@"Authorization"] = @"Bearer bogusToken";
+  call.oauth2AccessToken = @"bogusToken";
 
   id<GRXWriteable> responsesWriteable = [[GRXWriteable alloc] initWithValueHandler:^(NSData *value) {
     XCTFail(@"Received unexpected response: %@", value);
@@ -165,7 +170,7 @@ static ProtoMethod *kUnaryCallMethod;
     XCTAssertEqual(errorOrNil.code, 16, @"Finished with unexpected error: %@", errorOrNil);
     XCTAssertEqualObjects(call.responseMetadata, errorOrNil.userInfo[kGRPCStatusMetadataKey],
                           @"Metadata in the NSError object and call object differ.");
-    NSString *challengeHeader = call.responseMetadata[@"www-authenticate"];
+    NSString *challengeHeader = call.oauth2ChallengeHeader;
     XCTAssertGreaterThan(challengeHeader.length, 0,
                          @"No challenge in response headers %@", call.responseMetadata);
     [expectation fulfill];
diff --git a/src/core/httpcli/httpcli_security_connector.h b/src/objective-c/tests/InteropTests.h
index c50f25905e..4eb97e9e06 100644
--- a/src/core/httpcli/httpcli_security_connector.h
+++ b/src/objective-c/tests/InteropTests.h
@@ -31,13 +31,14 @@
  *
  */
 
-#ifndef GRPC_INTERNAL_CORE_HTTPCLI_HTTPCLI_SECURITY_CONNECTOR_H
-#define GRPC_INTERNAL_CORE_HTTPCLI_HTTPCLI_SECURITY_CONNECTOR_H
+#import <XCTest/XCTest.h>
 
-#include "src/core/security/security_connector.h"
+// Implements tests as described here:
+// https://github.com/grpc/grpc/blob/master/doc/interop-test-descriptions.md
 
-grpc_security_status grpc_httpcli_ssl_channel_security_connector_create(
-    const unsigned char *pem_root_certs, size_t pem_root_certs_size,
-    const char *secure_peer_name, grpc_channel_security_connector **sc);
-
-#endif  /* GRPC_INTERNAL_CORE_HTTPCLI_HTTPCLI_SECURITY_CONNECTOR_H */
+@interface InteropTests : XCTestCase
+// Returns @"localhost:5050".
+// Override in a subclass to perform the same tests against a different address.
+// For interop tests, use @"grpc-test.sandbox.google.com".
++ (NSString *)host;
+@end
diff --git a/src/objective-c/tests/InteropTests.m b/src/objective-c/tests/InteropTests.m
index 501f33317a..b61d567464 100644
--- a/src/objective-c/tests/InteropTests.m
+++ b/src/objective-c/tests/InteropTests.m
@@ -31,11 +31,11 @@
  *
  */
 
-#include <grpc/status.h>
+#import "InteropTests.h"
 
-#import <UIKit/UIKit.h>
-#import <XCTest/XCTest.h>
+#include <grpc/status.h>
 
+#import <GRPCClient/GRPCCall+Tests.h>
 #import <ProtoRPC/ProtoRPC.h>
 #import <RemoteTest/Empty.pbobjc.h>
 #import <RemoteTest/Messages.pbobjc.h>
@@ -76,18 +76,24 @@
 }
 @end
 
-@interface InteropTests : XCTestCase
-@end
+#pragma mark Tests
+
+static NSString * const kLocalCleartextHost = @"localhost:5050";
 
 @implementation InteropTests {
   RMTTestService *_service;
 }
 
-- (void)setUp {
-  _service = [[RMTTestService alloc] initWithHost:@"grpc-test.sandbox.google.com"];
++ (NSString *)host {
+  return kLocalCleartextHost;
 }
 
-// Tests as described here: https://github.com/grpc/grpc/blob/master/doc/interop-test-descriptions.md
+- (void)setUp {
+  // Register test server as non-SSL.
+  [GRPCCall useInsecureConnectionsForHost:kLocalCleartextHost];
+
+  _service = [[RMTTestService alloc] initWithHost:self.class.host];
+}
 
 - (void)testEmptyUnaryRPC {
   __weak XCTestExpectation *expectation = [self expectationWithDescription:@"EmptyUnary"];
diff --git a/src/objective-c/tests/InteropTestsLocalSSL.m b/src/objective-c/tests/InteropTestsLocalSSL.m
new file mode 100644
index 0000000000..227ca79659
--- /dev/null
+++ b/src/objective-c/tests/InteropTestsLocalSSL.m
@@ -0,0 +1,62 @@
+/*
+ *
+ * Copyright 2015, Google Inc.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *
+ *     * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above
+ * copyright notice, this list of conditions and the following disclaimer
+ * in the documentation and/or other materials provided with the
+ * distribution.
+ *     * Neither the name of Google Inc. nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ */
+
+// Repeat of the tests in InteropTests.m, but using SSL to communicate with the local server instead
+// of cleartext.
+
+#import <GRPCClient/GRPCCall+Tests.h>
+
+#import "InteropTests.h"
+
+static NSString * const kLocalSSLHost = @"localhost:5051";
+
+@interface InteropTestsLocalSSL : InteropTests
+@end
+
+@implementation InteropTestsLocalSSL
+
++ (NSString *)host {
+  return kLocalSSLHost;
+}
+
+- (void)setUp {
+  // Register test server certificates and name.
+  NSBundle *bundle = [NSBundle bundleForClass:self.class];
+  NSString *certsPath = [bundle pathForResource:@"TestCertificates.bundle/test-certificates"
+                                         ofType:@"pem"];
+  [GRPCCall useTestCertsPath:certsPath testName:@"foo.test.google.fr" forHost:kLocalSSLHost];
+
+  [super setUp];
+}
+
+@end
diff --git a/src/python/interop/interop/credentials/ca.pem b/src/objective-c/tests/TestCertificates.bundle/test-certificates.pem
index 6c8511a73c..6c8511a73c 100755..100644
--- a/src/python/interop/interop/credentials/ca.pem
+++ b/src/objective-c/tests/TestCertificates.bundle/test-certificates.pem
diff --git a/src/objective-c/tests/Tests.xcodeproj/project.pbxproj b/src/objective-c/tests/Tests.xcodeproj/project.pbxproj
index f13fb8288b..af98aba9c0 100644
--- a/src/objective-c/tests/Tests.xcodeproj/project.pbxproj
+++ b/src/objective-c/tests/Tests.xcodeproj/project.pbxproj
@@ -13,6 +13,8 @@
 		63423F511B151B77006CF63C /* RxLibraryUnitTests.m in Sources */ = {isa = PBXBuildFile; fileRef = 63423F501B151B77006CF63C /* RxLibraryUnitTests.m */; };
 		635697CD1B14FC11007A7283 /* Tests.m in Sources */ = {isa = PBXBuildFile; fileRef = 635697CC1B14FC11007A7283 /* Tests.m */; };
 		635ED2EC1B1A3BC400FDE5C3 /* InteropTests.m in Sources */ = {isa = PBXBuildFile; fileRef = 635ED2EB1B1A3BC400FDE5C3 /* InteropTests.m */; };
+		63E240CE1B6C4E2B005F3B0E /* InteropTestsLocalSSL.m in Sources */ = {isa = PBXBuildFile; fileRef = 63E240CD1B6C4E2B005F3B0E /* InteropTestsLocalSSL.m */; };
+		63E240D01B6C63DC005F3B0E /* TestCertificates.bundle in Resources */ = {isa = PBXBuildFile; fileRef = 63E240CF1B6C63DC005F3B0E /* TestCertificates.bundle */; };
 		7D8A186224D39101F90230F6 /* libPods.a in Frameworks */ = {isa = PBXBuildFile; fileRef = 35F2B6BF3BAE8F0DC4AFD76E /* libPods.a */; };
 /* End PBXBuildFile section */
 
@@ -49,6 +51,9 @@
 		635697CC1B14FC11007A7283 /* Tests.m */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.objc; path = Tests.m; sourceTree = "<group>"; };
 		635697D81B14FC11007A7283 /* Info.plist */ = {isa = PBXFileReference; lastKnownFileType = text.plist.xml; path = Info.plist; sourceTree = "<group>"; };
 		635ED2EB1B1A3BC400FDE5C3 /* InteropTests.m */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.objc; path = InteropTests.m; sourceTree = "<group>"; };
+		63E240CC1B6C4D3A005F3B0E /* InteropTests.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; path = InteropTests.h; sourceTree = "<group>"; };
+		63E240CD1B6C4E2B005F3B0E /* InteropTestsLocalSSL.m */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.objc; path = InteropTestsLocalSSL.m; sourceTree = "<group>"; };
+		63E240CF1B6C63DC005F3B0E /* TestCertificates.bundle */ = {isa = PBXFileReference; lastKnownFileType = "wrapper.plug-in"; path = TestCertificates.bundle; sourceTree = "<group>"; };
 		FF7B5489BCFE40111D768DD0 /* Pods.debug.xcconfig */ = {isa = PBXFileReference; includeInIndex = 1; lastKnownFileType = text.xcconfig; name = Pods.debug.xcconfig; path = "Pods/Target Support Files/Pods/Pods.debug.xcconfig"; sourceTree = "<group>"; };
 /* End PBXFileReference section */
 
@@ -93,6 +98,7 @@
 			isa = PBXGroup;
 			children = (
 				635697C91B14FC11007A7283 /* Tests */,
+				63E240CF1B6C63DC005F3B0E /* TestCertificates.bundle */,
 				635697C81B14FC11007A7283 /* Products */,
 				51E4650F34F854F41FF053B3 /* Pods */,
 				136D535E19727099B941D7B1 /* Frameworks */,
@@ -111,12 +117,14 @@
 		635697C91B14FC11007A7283 /* Tests */ = {
 			isa = PBXGroup;
 			children = (
+				63E240CD1B6C4E2B005F3B0E /* InteropTestsLocalSSL.m */,
 				6312AE4D1B1BF49B00341DEE /* GRPCClientTests.m */,
 				63175DFE1B1B9FAF00027841 /* LocalClearTextTests.m */,
 				635ED2EB1B1A3BC400FDE5C3 /* InteropTests.m */,
 				63423F501B151B77006CF63C /* RxLibraryUnitTests.m */,
 				635697CC1B14FC11007A7283 /* Tests.m */,
 				635697D71B14FC11007A7283 /* Supporting Files */,
+				63E240CC1B6C4D3A005F3B0E /* InteropTests.h */,
 			);
 			name = Tests;
 			sourceTree = SOURCE_ROOT;
@@ -209,6 +217,7 @@
 			isa = PBXResourcesBuildPhase;
 			buildActionMask = 2147483647;
 			files = (
+				63E240D01B6C63DC005F3B0E /* TestCertificates.bundle in Resources */,
 			);
 			runOnlyForDeploymentPostprocessing = 0;
 		};
@@ -254,6 +263,7 @@
 			files = (
 				63175DFF1B1B9FAF00027841 /* LocalClearTextTests.m in Sources */,
 				63423F511B151B77006CF63C /* RxLibraryUnitTests.m in Sources */,
+				63E240CE1B6C4E2B005F3B0E /* InteropTestsLocalSSL.m in Sources */,
 				6312AE4E1B1BF49B00341DEE /* GRPCClientTests.m in Sources */,
 				635ED2EC1B1A3BC400FDE5C3 /* InteropTests.m in Sources */,
 			);
diff --git a/src/objective-c/tests/Tests.xcodeproj/xcshareddata/xcschemes/AllTests.xcscheme b/src/objective-c/tests/Tests.xcodeproj/xcshareddata/xcschemes/AllTests.xcscheme
index 3a6e2c3591..a7e0ed110e 100644
--- a/src/objective-c/tests/Tests.xcodeproj/xcshareddata/xcschemes/AllTests.xcscheme
+++ b/src/objective-c/tests/Tests.xcodeproj/xcshareddata/xcschemes/AllTests.xcscheme
@@ -39,6 +39,12 @@
             </BuildableReference>
             <SkippedTests>
                <Test
+                  Identifier = "GRPCClientTests/testConnectionToRemoteServer">
+               </Test>
+               <Test
+                  Identifier = "GRPCClientTests/testMetadata">
+               </Test>
+               <Test
                   Identifier = "LocalClearTextTests">
                </Test>
                <Test
diff --git a/src/objective-c/tests/build_tests.sh b/src/objective-c/tests/build_tests.sh
new file mode 100755
index 0000000000..e7ad31e403
--- /dev/null
+++ b/src/objective-c/tests/build_tests.sh
@@ -0,0 +1,66 @@
+#!/bin/bash
+# Copyright 2015, Google Inc.
+# All rights reserved.
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions are
+# met:
+#
+#     * Redistributions of source code must retain the above copyright
+# notice, this list of conditions and the following disclaimer.
+#     * Redistributions in binary form must reproduce the above
+# copyright notice, this list of conditions and the following disclaimer
+# in the documentation and/or other materials provided with the
+# distribution.
+#     * Neither the name of Google Inc. nor the names of its
+# contributors may be used to endorse or promote products derived from
+# this software without specific prior written permission.
+#
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+# Don't run this script standalone. Instead, run from the repository root:
+# ./tools/run_tests/run_tests.py -l objc
+
+set -e
+
+cd $(dirname $0)
+
+hash pod 2>/dev/null || { echo >&2 "Cocoapods needs to be installed."; exit 1; }
+hash xcodebuild 2>/dev/null || {
+    echo >&2 "XCode command-line tools need to be installed."
+    exit 1
+}
+
+BINDIR=../../../bins/$CONFIG
+
+if [ ! -f $BINDIR/protobuf/protoc ]; then
+    hash protoc 2>/dev/null || {
+        echo >&2 "Can't find protoc. Make sure run_tests.py is making" \
+                 "grpc_objective_c_plugin before calling this script."
+        exit 1
+    }
+    # When protoc is already installed, make doesn't compile one. Put a link
+    # there so the podspecs can do codegen using that path.
+    mkdir -p $BINDIR/protobuf
+    ln -s `which protoc` $BINDIR/protobuf/protoc
+fi
+
+[ -f $BINDIR/interop_server ] || {
+    echo >&2 "Can't find the test server. Make sure run_tests.py is making" \
+             "interop_server before calling this script. It needs to be done" \
+             "before because pod install of gRPC renames some C gRPC files" \
+             "and not the server's code references to them."
+    exit 1
+}
+
+pod install
diff --git a/src/objective-c/tests/run_tests.sh b/src/objective-c/tests/run_tests.sh
index 37fced3a62..7b133c1782 100755
--- a/src/objective-c/tests/run_tests.sh
+++ b/src/objective-c/tests/run_tests.sh
@@ -28,13 +28,18 @@
 # (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 # OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
+# Don't run this script standalone. Instead, run from the repository root:
+# ./tools/run_tests/run_tests.py -l objc
+
 set -e
 
 cd $(dirname $0)
 
-# TODO(jcanizales): Remove when Cocoapods issue #3823 is resolved.
-export COCOAPODS_DISABLE_DETERMINISTIC_UUIDS=YES
-pod install
+# Run the tests server.
+../../../bins/$CONFIG/interop_server --port=5050 &
+../../../bins/$CONFIG/interop_server --port=5051 --enable_ssl &
+# Kill them when this script exits.
+trap 'kill -9 `jobs -p`' EXIT
 
 # xcodebuild is very verbose. We filter its output and tell Bash to fail if any
 # element of the pipe fails.
diff --git a/src/php/composer.json b/src/php/composer.json
index b0115bdadd..2d0fe0c87a 100644
--- a/src/php/composer.json
+++ b/src/php/composer.json
@@ -1,7 +1,7 @@
 {
   "name": "grpc/grpc",
   "description": "gRPC library for PHP",
-  "version": "0.5.0",
+  "version": "0.5.1",
   "homepage": "http://grpc.io",
   "license": "BSD-3-Clause",
   "repositories": [
diff --git a/src/php/ext/grpc/call.c b/src/php/ext/grpc/call.c
index b67bae7568..01ec909b79 100644
--- a/src/php/ext/grpc/call.c
+++ b/src/php/ext/grpc/call.c
@@ -240,8 +240,8 @@ PHP_METHOD(Call, __construct) {
       (wrapped_grpc_timeval *)zend_object_store_get_object(
           deadline_obj TSRMLS_CC);
   call->wrapped = grpc_channel_create_call(
-      channel->wrapped, completion_queue, method, channel->target,
-      deadline->wrapped);
+      channel->wrapped, NULL, GRPC_PROPAGATE_DEFAULTS, completion_queue, method,
+      channel->target, deadline->wrapped);
 }
 
 /**
@@ -473,6 +473,16 @@ cleanup:
 }
 
 /**
+ * Get the endpoint this call/stream is connected to
+ * @return string The URI of the endpoint
+ */
+PHP_METHOD(Call, getPeer) {
+  wrapped_grpc_call *call =
+      (wrapped_grpc_call *)zend_object_store_get_object(getThis() TSRMLS_CC);
+  RETURN_STRING(grpc_call_get_peer(call->wrapped), 1);
+}
+
+/**
  * Cancel the call. This will cause the call to end with STATUS_CANCELLED if it
  * has not already ended with another status.
  */
@@ -485,7 +495,9 @@ PHP_METHOD(Call, cancel) {
 static zend_function_entry call_methods[] = {
     PHP_ME(Call, __construct, NULL, ZEND_ACC_PUBLIC | ZEND_ACC_CTOR)
     PHP_ME(Call, startBatch, NULL, ZEND_ACC_PUBLIC)
-    PHP_ME(Call, cancel, NULL, ZEND_ACC_PUBLIC) PHP_FE_END};
+    PHP_ME(Call, getPeer, NULL, ZEND_ACC_PUBLIC)
+    PHP_ME(Call, cancel, NULL, ZEND_ACC_PUBLIC)
+    PHP_FE_END};
 
 void grpc_init_call(TSRMLS_D) {
   zend_class_entry ce;
diff --git a/src/php/ext/grpc/channel.c b/src/php/ext/grpc/channel.c
index b8262db162..7d8a6f87ab 100644
--- a/src/php/ext/grpc/channel.c
+++ b/src/php/ext/grpc/channel.c
@@ -152,7 +152,7 @@ PHP_METHOD(Channel, __construct) {
   override = target;
   override_len = target_length;
   if (args_array == NULL) {
-    channel->wrapped = grpc_channel_create(target, NULL);
+    channel->wrapped = grpc_insecure_channel_create(target, NULL);
   } else {
     array_hash = Z_ARRVAL_P(args_array);
     if (zend_hash_find(array_hash, "credentials", sizeof("credentials"),
@@ -182,7 +182,7 @@ PHP_METHOD(Channel, __construct) {
     }
     php_grpc_read_args_array(args_array, &args);
     if (creds == NULL) {
-      channel->wrapped = grpc_channel_create(target, &args);
+      channel->wrapped = grpc_insecure_channel_create(target, &args);
     } else {
       gpr_log(GPR_DEBUG, "Initialized secure channel");
       channel->wrapped =
@@ -195,6 +195,16 @@ PHP_METHOD(Channel, __construct) {
 }
 
 /**
+ * Get the endpoint this call/stream is connected to
+ * @return string The URI of the endpoint
+ */
+PHP_METHOD(Channel, getTarget) {
+  wrapped_grpc_channel *channel =
+      (wrapped_grpc_channel *)zend_object_store_get_object(getThis() TSRMLS_CC);
+  RETURN_STRING(grpc_channel_get_target(channel->wrapped), 1);
+}
+
+/**
  * Close the channel
  */
 PHP_METHOD(Channel, close) {
@@ -208,7 +218,9 @@ PHP_METHOD(Channel, close) {
 
 static zend_function_entry channel_methods[] = {
     PHP_ME(Channel, __construct, NULL, ZEND_ACC_PUBLIC | ZEND_ACC_CTOR)
-    PHP_ME(Channel, close, NULL, ZEND_ACC_PUBLIC) PHP_FE_END};
+    PHP_ME(Channel, getTarget, NULL, ZEND_ACC_PUBLIC)
+    PHP_ME(Channel, close, NULL, ZEND_ACC_PUBLIC)
+    PHP_FE_END};
 
 void grpc_init_channel(TSRMLS_D) {
   zend_class_entry ce;
diff --git a/src/php/ext/grpc/credentials.c b/src/php/ext/grpc/credentials.c
index a262b9981f..01cb94e3aa 100644
--- a/src/php/ext/grpc/credentials.c
+++ b/src/php/ext/grpc/credentials.c
@@ -175,23 +175,12 @@ PHP_METHOD(Credentials, createGce) {
   RETURN_DESTROY_ZVAL(creds_object);
 }
 
-/**
- * Create fake credentials. Only to be used for testing.
- * @return Credentials The new fake credentials object
- */
-PHP_METHOD(Credentials, createFake) {
-  grpc_credentials *creds = grpc_fake_transport_security_credentials_create();
-  zval *creds_object = grpc_php_wrap_credentials(creds);
-  RETURN_DESTROY_ZVAL(creds_object);
-}
-
 static zend_function_entry credentials_methods[] = {
     PHP_ME(Credentials, createDefault, NULL, ZEND_ACC_PUBLIC | ZEND_ACC_STATIC)
     PHP_ME(Credentials, createSsl, NULL, ZEND_ACC_PUBLIC | ZEND_ACC_STATIC)
     PHP_ME(Credentials, createComposite, NULL,
            ZEND_ACC_PUBLIC | ZEND_ACC_STATIC)
     PHP_ME(Credentials, createGce, NULL, ZEND_ACC_PUBLIC | ZEND_ACC_STATIC)
-    PHP_ME(Credentials, createFake, NULL, ZEND_ACC_PUBLIC | ZEND_ACC_STATIC)
     PHP_FE_END};
 
 void grpc_init_credentials(TSRMLS_D) {
diff --git a/src/php/ext/grpc/server.c b/src/php/ext/grpc/server.c
index 8b8d5b2f47..d58aa884ca 100644
--- a/src/php/ext/grpc/server.c
+++ b/src/php/ext/grpc/server.c
@@ -182,7 +182,7 @@ PHP_METHOD(Server, addHttp2Port) {
                          "add_http2_port expects a string", 1 TSRMLS_CC);
     return;
   }
-  RETURN_LONG(grpc_server_add_http2_port(server->wrapped, addr));
+  RETURN_LONG(grpc_server_add_insecure_http2_port(server->wrapped, addr));
 }
 
 PHP_METHOD(Server, addSecureHttp2Port) {
diff --git a/src/php/ext/grpc/server_credentials.c b/src/php/ext/grpc/server_credentials.c
index c4c1fabb1a..e9183c4598 100644
--- a/src/php/ext/grpc/server_credentials.c
+++ b/src/php/ext/grpc/server_credentials.c
@@ -115,27 +115,16 @@ PHP_METHOD(ServerCredentials, createSsl) {
                          "createSsl expects 3 strings", 1 TSRMLS_CC);
     return;
   }
-  grpc_server_credentials *creds =
-      grpc_ssl_server_credentials_create(pem_root_certs, &pem_key_cert_pair, 1);
-  zval *creds_object = grpc_php_wrap_server_credentials(creds);
-  RETURN_DESTROY_ZVAL(creds_object);
-}
-
-/**
- * Create fake credentials. Only to be used for testing.
- * @return ServerCredentials The new fake credentials object
- */
-PHP_METHOD(ServerCredentials, createFake) {
-  grpc_server_credentials *creds =
-      grpc_fake_transport_security_server_credentials_create();
+  /* TODO: add a force_client_auth field in ServerCredentials and pass it as
+   * the last parameter. */
+  grpc_server_credentials *creds = grpc_ssl_server_credentials_create(
+      pem_root_certs, &pem_key_cert_pair, 1, 0);
   zval *creds_object = grpc_php_wrap_server_credentials(creds);
   RETURN_DESTROY_ZVAL(creds_object);
 }
 
 static zend_function_entry server_credentials_methods[] = {
     PHP_ME(ServerCredentials, createSsl, NULL,
-           ZEND_ACC_PUBLIC | ZEND_ACC_STATIC)
-    PHP_ME(ServerCredentials, createFake, NULL,
            ZEND_ACC_PUBLIC | ZEND_ACC_STATIC) PHP_FE_END};
 
 void grpc_init_server_credentials(TSRMLS_D) {
diff --git a/src/php/lib/Grpc/AbstractCall.php b/src/php/lib/Grpc/AbstractCall.php
index 5b28417a0d..35057224f8 100644
--- a/src/php/lib/Grpc/AbstractCall.php
+++ b/src/php/lib/Grpc/AbstractCall.php
@@ -68,6 +68,13 @@ abstract class AbstractCall {
   }
 
   /**
+   * @return string The URI of the endpoint.
+   */
+  public function getPeer() {
+    return $this->call->getPeer();
+  }
+
+  /**
    * Cancels the call
    */
   public function cancel() {
diff --git a/src/php/lib/Grpc/BaseStub.php b/src/php/lib/Grpc/BaseStub.php
index 48c00977eb..a0c677908c 100755
--- a/src/php/lib/Grpc/BaseStub.php
+++ b/src/php/lib/Grpc/BaseStub.php
@@ -60,11 +60,21 @@ class BaseStub {
       }
       unset($opts['update_metadata']);
     }
-         
+    $package_config = json_decode(
+        file_get_contents(dirname(__FILE__) . '/../../composer.json'), true);
+    $opts['grpc.primary_user_agent'] =
+        'grpc-php/' . $package_config['version'];
     $this->channel = new Channel($hostname, $opts);
   }
 
   /**
+   * @return string The URI of the endpoint.
+   */
+  public function getTarget() {
+    return $this->channel->getTarget();
+  }
+
+  /**
    * Close the communication channel associated with this stub
    */
   public function close() {
diff --git a/src/php/tests/generated_code/AbstractGeneratedCodeTest.php b/src/php/tests/generated_code/AbstractGeneratedCodeTest.php
index 6102aaf0a8..8b7e67f57c 100644
--- a/src/php/tests/generated_code/AbstractGeneratedCodeTest.php
+++ b/src/php/tests/generated_code/AbstractGeneratedCodeTest.php
@@ -43,7 +43,9 @@ abstract class AbstractGeneratedCodeTest extends PHPUnit_Framework_TestCase {
     $div_arg = new math\DivArgs();
     $div_arg->setDividend(7);
     $div_arg->setDivisor(4);
-    list($response, $status) = self::$client->Div($div_arg)->wait();
+    $call = self::$client->Div($div_arg);
+    $this->assertTrue(is_string($call->getPeer()));
+    list($response, $status) = $call->wait();
     $this->assertSame(1, $response->getQuotient());
     $this->assertSame(3, $response->getRemainder());
     $this->assertSame(\Grpc\STATUS_OK, $status->code);
@@ -53,6 +55,7 @@ abstract class AbstractGeneratedCodeTest extends PHPUnit_Framework_TestCase {
     $fib_arg = new math\FibArgs();
     $fib_arg->setLimit(7);
     $call = self::$client->Fib($fib_arg);
+    $this->assertTrue(is_string($call->getPeer()));
     $result_array = iterator_to_array($call->responses());
     $extract_num = function($num){
       return $num->getNum();
@@ -72,6 +75,7 @@ abstract class AbstractGeneratedCodeTest extends PHPUnit_Framework_TestCase {
       }
     };
     $call = self::$client->Sum($num_iter());
+    $this->assertTrue(is_string($call->getPeer()));
     list($response, $status) = $call->wait();
     $this->assertSame(21, $response->getNum());
     $this->assertSame(\Grpc\STATUS_OK, $status->code);
@@ -79,6 +83,7 @@ abstract class AbstractGeneratedCodeTest extends PHPUnit_Framework_TestCase {
 
   public function testBidiStreaming() {
     $call = self::$client->DivMany();
+    $this->assertTrue(is_string($call->getPeer()));
     for ($i = 0; $i < 7; $i++) {
       $div_arg = new math\DivArgs();
       $div_arg->setDividend(2 * $i + 1);
diff --git a/src/php/tests/interop/interop_client.php b/src/php/tests/interop/interop_client.php
index 2041577557..44e6242c29 100755
--- a/src/php/tests/interop/interop_client.php
+++ b/src/php/tests/interop/interop_client.php
@@ -332,10 +332,11 @@ if (in_array($args['test_case'], array(
   $opts['update_metadata'] = $auth->getUpdateMetadataFunc();
 }
 
-$stub = new grpc\testing\TestServiceClient(
-    new Grpc\BaseStub(
-        $server_address,
-        $opts));
+$internal_stub = new Grpc\BaseStub($server_address, $opts);
+hardAssert(is_string($internal_stub->getTarget()),
+           'Unexpected target URI value');
+
+$stub = new grpc\testing\TestServiceClient($internal_stub);
 
 echo "Connecting to $server_address\n";
 echo "Running test case $args[test_case]\n";
diff --git a/src/php/tests/unit_tests/CallTest.php b/src/php/tests/unit_tests/CallTest.php
index 77a2d86ce4..caff15ee11 100755
--- a/src/php/tests/unit_tests/CallTest.php
+++ b/src/php/tests/unit_tests/CallTest.php
@@ -79,4 +79,8 @@ class CallTest extends PHPUnit_Framework_TestCase{
     $result = $this->call->startBatch($batch);
     $this->assertTrue($result->send_metadata);
   }
+
+  public function testGetPeer() {
+    $this->assertTrue(is_string($this->call->getPeer()));
+  }
 }
diff --git a/src/php/tests/unit_tests/EndToEndTest.php b/src/php/tests/unit_tests/EndToEndTest.php
index 2980dca4a7..27e27cdfdf 100755
--- a/src/php/tests/unit_tests/EndToEndTest.php
+++ b/src/php/tests/unit_tests/EndToEndTest.php
@@ -34,8 +34,8 @@
 class EndToEndTest extends PHPUnit_Framework_TestCase{
   public function setUp() {
     $this->server = new Grpc\Server([]);
-    $port = $this->server->addHttp2Port('0.0.0.0:0');
-    $this->channel = new Grpc\Channel('localhost:' . $port, []);
+    $this->port = $this->server->addHttp2Port('0.0.0.0:0');
+    $this->channel = new Grpc\Channel('localhost:' . $this->port, []);
     $this->server->start();
   }
 
@@ -149,4 +149,8 @@ class EndToEndTest extends PHPUnit_Framework_TestCase{
     unset($call);
     unset($server_call);
   }
+
+  public function testGetTarget() {
+    $this->assertTrue(is_string($this->channel->getTarget()));
+  }
 }
diff --git a/src/python/grpcio/.gitignore b/src/python/grpcio/.gitignore
new file mode 100644
index 0000000000..4c02b8d14d
--- /dev/null
+++ b/src/python/grpcio/.gitignore
@@ -0,0 +1,9 @@
+MANIFEST
+*.egg-info/
+build/
+dist/
+*.egg
+*.egg/
+*.eggs/
+doc/
+_grpcio_metadata.py
diff --git a/src/python/grpcio/MANIFEST.in b/src/python/grpcio/MANIFEST.in
new file mode 100644
index 0000000000..9583dc7768
--- /dev/null
+++ b/src/python/grpcio/MANIFEST.in
@@ -0,0 +1,3 @@
+graft grpc
+include commands.py
+include requirements.txt
diff --git a/src/python/src/README.rst b/src/python/grpcio/README.rst
index 00bdecf56f..00bdecf56f 100644
--- a/src/python/src/README.rst
+++ b/src/python/grpcio/README.rst
diff --git a/src/python/grpcio/commands.py b/src/python/grpcio/commands.py
new file mode 100644
index 0000000000..89c0fbf0f3
--- /dev/null
+++ b/src/python/grpcio/commands.py
@@ -0,0 +1,102 @@
+# Copyright 2015, Google Inc.
+# All rights reserved.
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions are
+# met:
+#
+#     * Redistributions of source code must retain the above copyright
+# notice, this list of conditions and the following disclaimer.
+#     * Redistributions in binary form must reproduce the above
+# copyright notice, this list of conditions and the following disclaimer
+# in the documentation and/or other materials provided with the
+# distribution.
+#     * Neither the name of Google Inc. nor the names of its
+# contributors may be used to endorse or promote products derived from
+# this software without specific prior written permission.
+#
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+"""Provides distutils command classes for the GRPC Python setup process."""
+
+import os
+import os.path
+import sys
+
+import setuptools
+from setuptools.command import build_py
+
+_CONF_PY_ADDENDUM = """
+extensions.append('sphinx.ext.napoleon')
+napoleon_google_docstring = True
+napoleon_numpy_docstring = True
+
+html_theme = 'sphinx_rtd_theme'
+"""
+
+
+class SphinxDocumentation(setuptools.Command):
+  """Command to generate documentation via sphinx."""
+
+  description = ''
+  user_options = []
+
+  def initialize_options(self):
+    pass
+
+  def finalize_options(self):
+    pass
+
+  def run(self):
+    # We import here to ensure that setup.py has had a chance to install the
+    # relevant package eggs first.
+    import sphinx
+    import sphinx.apidoc
+    metadata = self.distribution.metadata
+    src_dir = os.path.join(
+        os.getcwd(), self.distribution.package_dir['grpc'])
+    sys.path.append(src_dir)
+    sphinx.apidoc.main([
+        '', '--force', '--full', '-H', metadata.name, '-A', metadata.author,
+        '-V', metadata.version, '-R', metadata.version,
+        '-o', os.path.join('doc', 'src'), src_dir])
+    conf_filepath = os.path.join('doc', 'src', 'conf.py')
+    with open(conf_filepath, 'a') as conf_file:
+      conf_file.write(_CONF_PY_ADDENDUM)
+    sphinx.main(['', os.path.join('doc', 'src'), os.path.join('doc', 'build')])
+
+
+class BuildProjectMetadata(setuptools.Command):
+  """Command to generate project metadata in a module."""
+
+  description = ''
+  user_options = []
+
+  def initialize_options(self):
+    pass
+
+  def finalize_options(self):
+    pass
+
+  def run(self):
+    with open('grpc/_grpcio_metadata.py', 'w') as module_file:
+      module_file.write('__version__ = """{}"""'.format(
+          self.distribution.get_version()))
+
+
+class BuildPy(build_py.build_py):
+  """Custom project build command."""
+
+  def run(self):
+    self.run_command('build_project_metadata')
+    build_py.build_py.run(self)
diff --git a/src/python/interop/interop/__init__.py b/src/python/grpcio/grpc/__init__.py
index 7086519106..7086519106 100644
--- a/src/python/interop/interop/__init__.py
+++ b/src/python/grpcio/grpc/__init__.py
diff --git a/src/python/src/grpc/_adapter/.gitignore b/src/python/grpcio/grpc/_adapter/.gitignore
index a6f96cd6db..a6f96cd6db 100644
--- a/src/python/src/grpc/_adapter/.gitignore
+++ b/src/python/grpcio/grpc/_adapter/.gitignore
diff --git a/src/python/src/grpc/__init__.py b/src/python/grpcio/grpc/_adapter/__init__.py
index 7086519106..7086519106 100644
--- a/src/python/src/grpc/__init__.py
+++ b/src/python/grpcio/grpc/_adapter/__init__.py
diff --git a/src/python/src/grpc/_adapter/_c/module.c b/src/python/grpcio/grpc/_adapter/_c/module.c
index 1f3aedd9d8..1f3aedd9d8 100644
--- a/src/python/src/grpc/_adapter/_c/module.c
+++ b/src/python/grpcio/grpc/_adapter/_c/module.c
diff --git a/src/python/src/grpc/_adapter/_c/types.c b/src/python/grpcio/grpc/_adapter/_c/types.c
index 8855c32ca6..8855c32ca6 100644
--- a/src/python/src/grpc/_adapter/_c/types.c
+++ b/src/python/grpcio/grpc/_adapter/_c/types.c
diff --git a/src/python/src/grpc/_adapter/_c/types.h b/src/python/grpcio/grpc/_adapter/_c/types.h
index 3449f0643f..4e0da4a28a 100644
--- a/src/python/src/grpc/_adapter/_c/types.h
+++ b/src/python/grpcio/grpc/_adapter/_c/types.h
@@ -63,8 +63,6 @@ ClientCredentials *pygrpc_ClientCredentials_jwt(
     PyTypeObject *type, PyObject *args, PyObject *kwargs);
 ClientCredentials *pygrpc_ClientCredentials_refresh_token(
     PyTypeObject *type, PyObject *args, PyObject *kwargs);
-ClientCredentials *pygrpc_ClientCredentials_fake_transport_security(
-    PyTypeObject *type, PyObject *ignored);
 ClientCredentials *pygrpc_ClientCredentials_iam(
     PyTypeObject *type, PyObject *args, PyObject *kwargs);
 extern PyTypeObject pygrpc_ClientCredentials_type;
@@ -81,8 +79,6 @@ typedef struct ServerCredentials {
 void pygrpc_ServerCredentials_dealloc(ServerCredentials *self);
 ServerCredentials *pygrpc_ServerCredentials_ssl(
     PyTypeObject *type, PyObject *args, PyObject *kwargs);
-ServerCredentials *pygrpc_ServerCredentials_fake_transport_security(
-    PyTypeObject *type, PyObject *ignored);
 extern PyTypeObject pygrpc_ServerCredentials_type;
 
 
diff --git a/src/python/src/grpc/_adapter/_c/types/call.c b/src/python/grpcio/grpc/_adapter/_c/types/call.c
index 0739070044..0739070044 100644
--- a/src/python/src/grpc/_adapter/_c/types/call.c
+++ b/src/python/grpcio/grpc/_adapter/_c/types/call.c
diff --git a/src/python/src/grpc/_adapter/_c/types/channel.c b/src/python/grpcio/grpc/_adapter/_c/types/channel.c
index c235597466..963104742f 100644
--- a/src/python/src/grpc/_adapter/_c/types/channel.c
+++ b/src/python/grpcio/grpc/_adapter/_c/types/channel.c
@@ -104,7 +104,7 @@ Channel *pygrpc_Channel_new(
   if (creds) {
     self->c_chan = grpc_secure_channel_create(creds->c_creds, target, &c_args);
   } else {
-    self->c_chan = grpc_channel_create(target, &c_args);
+    self->c_chan = grpc_insecure_channel_create(target, &c_args);
   }
   pygrpc_discard_channel_args(c_args);
   return self;
@@ -128,7 +128,7 @@ Call *pygrpc_Channel_create_call(
   }
   call = pygrpc_Call_new_empty(cq);
   call->c_call = grpc_channel_create_call(
-      self->c_chan, cq->c_cq, method, host,
+      self->c_chan, NULL, GRPC_PROPAGATE_DEFAULTS, cq->c_cq, method, host,
       pygrpc_cast_double_to_gpr_timespec(deadline));
   return call;
 }
diff --git a/src/python/src/grpc/_adapter/_c/types/client_credentials.c b/src/python/grpcio/grpc/_adapter/_c/types/client_credentials.c
index 6a4561c060..e314c15324 100644
--- a/src/python/src/grpc/_adapter/_c/types/client_credentials.c
+++ b/src/python/grpcio/grpc/_adapter/_c/types/client_credentials.c
@@ -54,9 +54,6 @@ PyMethodDef pygrpc_ClientCredentials_methods[] = {
      METH_CLASS|METH_KEYWORDS, ""},
     {"refresh_token", (PyCFunction)pygrpc_ClientCredentials_refresh_token,
      METH_CLASS|METH_KEYWORDS, ""},
-    {"fake_transport_security",
-     (PyCFunction)pygrpc_ClientCredentials_fake_transport_security,
-     METH_CLASS|METH_NOARGS, ""},
     {"iam", (PyCFunction)pygrpc_ClientCredentials_iam,
      METH_CLASS|METH_KEYWORDS, ""},
     {NULL}
@@ -208,6 +205,7 @@ ClientCredentials *pygrpc_ClientCredentials_service_account(
   return self;
 }
 
+/* TODO: Rename this credentials to something like service_account_jwt_access */
 ClientCredentials *pygrpc_ClientCredentials_jwt(
     PyTypeObject *type, PyObject *args, PyObject *kwargs) {
   ClientCredentials *self;
@@ -219,7 +217,7 @@ ClientCredentials *pygrpc_ClientCredentials_jwt(
     return NULL;
   }
   self = (ClientCredentials *)type->tp_alloc(type, 0);
-  self->c_creds = grpc_jwt_credentials_create(
+  self->c_creds = grpc_service_account_jwt_access_credentials_create(
       json_key, pygrpc_cast_double_to_gpr_timespec(lifetime));
   if (!self->c_creds) {
     Py_DECREF(self);
@@ -249,20 +247,6 @@ ClientCredentials *pygrpc_ClientCredentials_refresh_token(
   return self;
 }
 
-ClientCredentials *pygrpc_ClientCredentials_fake_transport_security(
-    PyTypeObject *type, PyObject *ignored) {
-  ClientCredentials *self = (ClientCredentials *)type->tp_alloc(type, 0);
-  self->c_creds = grpc_fake_transport_security_credentials_create();
-  if (!self->c_creds) {
-    Py_DECREF(self);
-    PyErr_SetString(PyExc_RuntimeError,
-                    "couldn't create fake credentials; "
-                    "something is horribly wrong with the universe");
-    return NULL;
-  }
-  return self;
-}
-
 ClientCredentials *pygrpc_ClientCredentials_iam(
     PyTypeObject *type, PyObject *args, PyObject *kwargs) {
   ClientCredentials *self;
diff --git a/src/python/src/grpc/_adapter/_c/types/completion_queue.c b/src/python/grpcio/grpc/_adapter/_c/types/completion_queue.c
index 2dd44b6ddd..2dd44b6ddd 100644
--- a/src/python/src/grpc/_adapter/_c/types/completion_queue.c
+++ b/src/python/grpcio/grpc/_adapter/_c/types/completion_queue.c
diff --git a/src/python/src/grpc/_adapter/_c/types/server.c b/src/python/grpcio/grpc/_adapter/_c/types/server.c
index 2a00f34039..c2190ea672 100644
--- a/src/python/src/grpc/_adapter/_c/types/server.c
+++ b/src/python/grpcio/grpc/_adapter/_c/types/server.c
@@ -155,7 +155,7 @@ PyObject *pygrpc_Server_add_http2_port(
     port = grpc_server_add_secure_http2_port(
         self->c_serv, addr, creds->c_creds);
   } else {
-    port = grpc_server_add_http2_port(self->c_serv, addr);
+    port = grpc_server_add_insecure_http2_port(self->c_serv, addr);
   }
   return PyInt_FromLong(port);
 
diff --git a/src/python/src/grpc/_adapter/_c/types/server_credentials.c b/src/python/grpcio/grpc/_adapter/_c/types/server_credentials.c
index 2e02c8fe81..f6859b79d7 100644
--- a/src/python/src/grpc/_adapter/_c/types/server_credentials.c
+++ b/src/python/grpcio/grpc/_adapter/_c/types/server_credentials.c
@@ -43,9 +43,6 @@
 PyMethodDef pygrpc_ServerCredentials_methods[] = {
     {"ssl", (PyCFunction)pygrpc_ServerCredentials_ssl,
      METH_CLASS|METH_KEYWORDS, ""},
-    {"fake_transport_security",
-     (PyCFunction)pygrpc_ServerCredentials_fake_transport_security,
-     METH_CLASS|METH_NOARGS, ""},
     {NULL}
 };
 const char pygrpc_ServerCredentials_doc[] = "";
@@ -131,16 +128,11 @@ ServerCredentials *pygrpc_ServerCredentials_ssl(
   }
 
   self = (ServerCredentials *)type->tp_alloc(type, 0);
+  /* TODO: Add a force_client_auth parameter in the python object and pass it
+     here as the last arg. */
   self->c_creds = grpc_ssl_server_credentials_create(
-      root_certs, key_cert_pairs, num_key_cert_pairs);
+      root_certs, key_cert_pairs, num_key_cert_pairs, 0);
   gpr_free(key_cert_pairs);
   return self;
 }
 
-ServerCredentials *pygrpc_ServerCredentials_fake_transport_security(
-    PyTypeObject *type, PyObject *ignored) {
-  ServerCredentials *self = (ServerCredentials *)type->tp_alloc(type, 0);
-  self->c_creds = grpc_fake_transport_security_server_credentials_create();
-  return self;
-}
-
diff --git a/src/python/src/grpc/_adapter/_c/utility.c b/src/python/grpcio/grpc/_adapter/_c/utility.c
index d9f911a41a..51f3c9be01 100644
--- a/src/python/src/grpc/_adapter/_c/utility.c
+++ b/src/python/grpcio/grpc/_adapter/_c/utility.c
@@ -374,6 +374,7 @@ PyObject *pygrpc_consume_ops(grpc_op *op, size_t nops) {
 }
 
 double pygrpc_cast_gpr_timespec_to_double(gpr_timespec timespec) {
+  timespec = gpr_convert_clock_type(timespec, GPR_CLOCK_REALTIME);
   return timespec.tv_sec + 1e-9*timespec.tv_nsec;
 }
 
diff --git a/src/python/src/grpc/_adapter/_common.py b/src/python/grpcio/grpc/_adapter/_common.py
index 492849f4cb..492849f4cb 100644
--- a/src/python/src/grpc/_adapter/_common.py
+++ b/src/python/grpcio/grpc/_adapter/_common.py
diff --git a/src/python/src/grpc/_adapter/_intermediary_low.py b/src/python/grpcio/grpc/_adapter/_intermediary_low.py
index 3c7f0a2619..3c7f0a2619 100644
--- a/src/python/src/grpc/_adapter/_intermediary_low.py
+++ b/src/python/grpcio/grpc/_adapter/_intermediary_low.py
diff --git a/src/python/src/grpc/_adapter/_low.py b/src/python/grpcio/grpc/_adapter/_low.py
index dcf67dbc11..dcf67dbc11 100644
--- a/src/python/src/grpc/_adapter/_low.py
+++ b/src/python/grpcio/grpc/_adapter/_low.py
diff --git a/src/python/src/grpc/_adapter/_types.py b/src/python/grpcio/grpc/_adapter/_types.py
index 5ddb1774ea..5ddb1774ea 100644
--- a/src/python/src/grpc/_adapter/_types.py
+++ b/src/python/grpcio/grpc/_adapter/_types.py
diff --git a/src/python/src/grpc/_adapter/fore.py b/src/python/grpcio/grpc/_adapter/fore.py
index 7d88bda263..7d88bda263 100644
--- a/src/python/src/grpc/_adapter/fore.py
+++ b/src/python/grpcio/grpc/_adapter/fore.py
diff --git a/src/python/src/grpc/_adapter/rear.py b/src/python/grpcio/grpc/_adapter/rear.py
index fd6f45f7a7..fd6f45f7a7 100644
--- a/src/python/src/grpc/_adapter/rear.py
+++ b/src/python/grpcio/grpc/_adapter/rear.py
diff --git a/src/python/src/grpc/_cython/.gitignore b/src/python/grpcio/grpc/_cython/.gitignore
index c315029288..c315029288 100644
--- a/src/python/src/grpc/_cython/.gitignore
+++ b/src/python/grpcio/grpc/_cython/.gitignore
diff --git a/src/python/src/grpc/_cython/README.rst b/src/python/grpcio/grpc/_cython/README.rst
index c0e66734e8..c0e66734e8 100644
--- a/src/python/src/grpc/_cython/README.rst
+++ b/src/python/grpcio/grpc/_cython/README.rst
diff --git a/src/python/src/grpc/_cython/__init__.py b/src/python/grpcio/grpc/_cython/__init__.py
index b89398809f..b89398809f 100644
--- a/src/python/src/grpc/_cython/__init__.py
+++ b/src/python/grpcio/grpc/_cython/__init__.py
diff --git a/src/python/src/grpc/_cython/_cygrpc/__init__.py b/src/python/grpcio/grpc/_cython/_cygrpc/__init__.py
index b89398809f..b89398809f 100644
--- a/src/python/src/grpc/_cython/_cygrpc/__init__.py
+++ b/src/python/grpcio/grpc/_cython/_cygrpc/__init__.py
diff --git a/src/python/src/grpc/_cython/_cygrpc/call.pxd b/src/python/grpcio/grpc/_cython/_cygrpc/call.pxd
index fe9b81e3d3..fe9b81e3d3 100644
--- a/src/python/src/grpc/_cython/_cygrpc/call.pxd
+++ b/src/python/grpcio/grpc/_cython/_cygrpc/call.pxd
diff --git a/src/python/src/grpc/_cython/_cygrpc/call.pyx b/src/python/grpcio/grpc/_cython/_cygrpc/call.pyx
index 4349786b3a..4349786b3a 100644
--- a/src/python/src/grpc/_cython/_cygrpc/call.pyx
+++ b/src/python/grpcio/grpc/_cython/_cygrpc/call.pyx
diff --git a/src/python/src/grpc/_cython/_cygrpc/channel.pxd b/src/python/grpcio/grpc/_cython/_cygrpc/channel.pxd
index 3e341bf222..3e341bf222 100644
--- a/src/python/src/grpc/_cython/_cygrpc/channel.pxd
+++ b/src/python/grpcio/grpc/_cython/_cygrpc/channel.pxd
diff --git a/src/python/src/grpc/_cython/_cygrpc/channel.pyx b/src/python/grpcio/grpc/_cython/_cygrpc/channel.pyx
index b20313818d..b20313818d 100644
--- a/src/python/src/grpc/_cython/_cygrpc/channel.pyx
+++ b/src/python/grpcio/grpc/_cython/_cygrpc/channel.pyx
diff --git a/src/python/src/grpc/_cython/_cygrpc/completion_queue.pxd b/src/python/grpcio/grpc/_cython/_cygrpc/completion_queue.pxd
index fd562ad75b..fd562ad75b 100644
--- a/src/python/src/grpc/_cython/_cygrpc/completion_queue.pxd
+++ b/src/python/grpcio/grpc/_cython/_cygrpc/completion_queue.pxd
diff --git a/src/python/src/grpc/_cython/_cygrpc/completion_queue.pyx b/src/python/grpcio/grpc/_cython/_cygrpc/completion_queue.pyx
index 886d85360a..886d85360a 100644
--- a/src/python/src/grpc/_cython/_cygrpc/completion_queue.pyx
+++ b/src/python/grpcio/grpc/_cython/_cygrpc/completion_queue.pyx
diff --git a/src/python/src/grpc/_cython/_cygrpc/credentials.pxd b/src/python/grpcio/grpc/_cython/_cygrpc/credentials.pxd
index 6b74a267e0..6b74a267e0 100644
--- a/src/python/src/grpc/_cython/_cygrpc/credentials.pxd
+++ b/src/python/grpcio/grpc/_cython/_cygrpc/credentials.pxd
diff --git a/src/python/src/grpc/_cython/_cygrpc/credentials.pyx b/src/python/grpcio/grpc/_cython/_cygrpc/credentials.pyx
index c14d8844dd..2d74702fbd 100644
--- a/src/python/src/grpc/_cython/_cygrpc/credentials.pyx
+++ b/src/python/grpcio/grpc/_cython/_cygrpc/credentials.pyx
@@ -126,6 +126,7 @@ def client_credentials_service_account(
   credentials.references.extend([json_key, scope])
   return credentials
 
+#TODO rename to something like client_credentials_service_account_jwt_access.
 def client_credentials_jwt(json_key, records.Timespec token_lifetime not None):
   if isinstance(json_key, bytes):
     pass
@@ -134,7 +135,7 @@ def client_credentials_jwt(json_key, records.Timespec token_lifetime not None):
   else:
     raise TypeError("expected json_key to be str or bytes")
   cdef ClientCredentials credentials = ClientCredentials()
-  credentials.c_credentials = grpc.grpc_jwt_credentials_create(
+  credentials.c_credentials = grpc.grpc_service_account_jwt_access_credentials_create(
       json_key, token_lifetime.c_time)
   credentials.references.append(json_key)
   return credentials
@@ -152,12 +153,6 @@ def client_credentials_refresh_token(json_refresh_token):
   credentials.references.append(json_refresh_token)
   return credentials
 
-def client_credentials_fake_transport_security():
-  cdef ClientCredentials credentials = ClientCredentials()
-  credentials.c_credentials = (
-      grpc.grpc_fake_transport_security_credentials_create())
-  return credentials
-
 def client_credentials_iam(authorization_token, authority_selector):
   if isinstance(authorization_token, bytes):
     pass
@@ -210,8 +205,3 @@ def server_credentials_ssl(pem_root_certs, pem_key_cert_pairs):
   )
   return credentials
 
-def server_credentials_fake_transport_security():
-  cdef ServerCredentials credentials = ServerCredentials()
-  credentials.c_credentials = (
-      grpc.grpc_fake_transport_security_server_credentials_create())
-  return credentials
diff --git a/src/python/src/grpc/_cython/_cygrpc/grpc.pxd b/src/python/grpcio/grpc/_cython/_cygrpc/grpc.pxd
index 7db8fbe31c..d065383587 100644
--- a/src/python/src/grpc/_cython/_cygrpc/grpc.pxd
+++ b/src/python/grpcio/grpc/_cython/_cygrpc/grpc.pxd
@@ -313,11 +313,10 @@ cdef extern from "grpc/grpc_security.h":
   grpc_credentials *grpc_compute_engine_credentials_create()
   grpc_credentials *grpc_service_account_credentials_create(
       const char *json_key, const char *scope, gpr_timespec token_lifetime)
-  grpc_credentials *grpc_jwt_credentials_create(const char *json_key,
+  grpc_credentials *grpc_service_account_jwt_access_credentials_create(const char *json_key,
                                                 gpr_timespec token_lifetime)
   grpc_credentials *grpc_refresh_token_credentials_create(
       const char *json_refresh_token)
-  grpc_credentials *grpc_fake_transport_security_credentials_create()
   grpc_credentials *grpc_iam_credentials_create(const char *authorization_token,
                                                 const char *authority_selector)
   void grpc_credentials_release(grpc_credentials *creds)
@@ -334,7 +333,6 @@ cdef extern from "grpc/grpc_security.h":
       const char *pem_root_certs,
       grpc_ssl_pem_key_cert_pair *pem_key_cert_pairs,
       size_t num_key_cert_pairs);
-  grpc_server_credentials *grpc_fake_transport_security_server_credentials_create()
   void grpc_server_credentials_release(grpc_server_credentials *creds)
 
   int grpc_server_add_secure_http2_port(grpc_server *server, const char *addr,
diff --git a/src/python/src/grpc/_cython/_cygrpc/records.pxd b/src/python/grpcio/grpc/_cython/_cygrpc/records.pxd
index 9ee487882a..9ee487882a 100644
--- a/src/python/src/grpc/_cython/_cygrpc/records.pxd
+++ b/src/python/grpcio/grpc/_cython/_cygrpc/records.pxd
diff --git a/src/python/src/grpc/_cython/_cygrpc/records.pyx b/src/python/grpcio/grpc/_cython/_cygrpc/records.pyx
index 4814769fd2..4814769fd2 100644
--- a/src/python/src/grpc/_cython/_cygrpc/records.pyx
+++ b/src/python/grpcio/grpc/_cython/_cygrpc/records.pyx
diff --git a/src/python/src/grpc/_cython/_cygrpc/server.pxd b/src/python/grpcio/grpc/_cython/_cygrpc/server.pxd
index 0257542a03..0257542a03 100644
--- a/src/python/src/grpc/_cython/_cygrpc/server.pxd
+++ b/src/python/grpcio/grpc/_cython/_cygrpc/server.pxd
diff --git a/src/python/src/grpc/_cython/_cygrpc/server.pyx b/src/python/grpcio/grpc/_cython/_cygrpc/server.pyx
index dcf9d38337..dcf9d38337 100644
--- a/src/python/src/grpc/_cython/_cygrpc/server.pyx
+++ b/src/python/grpcio/grpc/_cython/_cygrpc/server.pyx
diff --git a/src/python/src/grpc/_cython/adapter_low.py b/src/python/grpcio/grpc/_cython/adapter_low.py
index 7546dd1599..2bb468eece 100644
--- a/src/python/src/grpc/_cython/adapter_low.py
+++ b/src/python/grpcio/grpc/_cython/adapter_low.py
@@ -72,10 +72,6 @@ class ClientCredentials(object):
     raise NotImplementedError()
 
   @staticmethod
-  def fake_transport_security():
-    raise NotImplementedError()
-
-  @staticmethod
   def iam():
     raise NotImplementedError()
 
@@ -88,10 +84,6 @@ class ServerCredentials(object):
   def ssl():
     raise NotImplementedError()
 
-  @staticmethod
-  def fake_transport_security():
-    raise NotImplementedError()
-
 
 class CompletionQueue(type_interfaces.CompletionQueue):
   def __init__(self):
diff --git a/src/python/src/grpc/_cython/cygrpc.pyx b/src/python/grpcio/grpc/_cython/cygrpc.pyx
index dcb06f345c..f4d9661580 100644
--- a/src/python/src/grpc/_cython/cygrpc.pyx
+++ b/src/python/grpcio/grpc/_cython/cygrpc.pyx
@@ -82,12 +82,8 @@ client_credentials_compute_engine = (
     credentials.client_credentials_compute_engine)
 client_credentials_jwt = credentials.client_credentials_jwt
 client_credentials_refresh_token = credentials.client_credentials_refresh_token
-client_credentials_fake_transport_security = (
-    credentials.client_credentials_fake_transport_security)
 client_credentials_iam = credentials.client_credentials_iam
 server_credentials_ssl = credentials.server_credentials_ssl
-server_credentials_fake_transport_security = (
-    credentials.server_credentials_fake_transport_security)
 
 CompletionQueue = completion_queue.CompletionQueue
 Channel = channel.Channel
diff --git a/src/python/src/grpc/_adapter/__init__.py b/src/python/grpcio/grpc/_links/__init__.py
index 7086519106..7086519106 100644
--- a/src/python/src/grpc/_adapter/__init__.py
+++ b/src/python/grpcio/grpc/_links/__init__.py
diff --git a/src/python/src/grpc/_links/invocation.py b/src/python/grpcio/grpc/_links/invocation.py
index 0058ae91f8..0058ae91f8 100644
--- a/src/python/src/grpc/_links/invocation.py
+++ b/src/python/grpcio/grpc/_links/invocation.py
diff --git a/src/python/src/grpc/_links/service.py b/src/python/grpcio/grpc/_links/service.py
index 7783e91824..7783e91824 100644
--- a/src/python/src/grpc/_links/service.py
+++ b/src/python/grpcio/grpc/_links/service.py
diff --git a/src/python/src/grpc/_junkdrawer/__init__.py b/src/python/grpcio/grpc/early_adopter/__init__.py
index 7086519106..7086519106 100644
--- a/src/python/src/grpc/_junkdrawer/__init__.py
+++ b/src/python/grpcio/grpc/early_adopter/__init__.py
diff --git a/src/python/src/grpc/early_adopter/implementations.py b/src/python/grpcio/grpc/early_adopter/implementations.py
index 10919fae69..10919fae69 100644
--- a/src/python/src/grpc/early_adopter/implementations.py
+++ b/src/python/grpcio/grpc/early_adopter/implementations.py
diff --git a/src/python/src/grpc/_links/__init__.py b/src/python/grpcio/grpc/framework/__init__.py
index 7086519106..7086519106 100644
--- a/src/python/src/grpc/_links/__init__.py
+++ b/src/python/grpcio/grpc/framework/__init__.py
diff --git a/src/python/src/grpc/framework/alpha/__init__.py b/src/python/grpcio/grpc/framework/alpha/__init__.py
index b89398809f..b89398809f 100644
--- a/src/python/src/grpc/framework/alpha/__init__.py
+++ b/src/python/grpcio/grpc/framework/alpha/__init__.py
diff --git a/src/python/src/grpc/framework/alpha/_face_utilities.py b/src/python/grpcio/grpc/framework/alpha/_face_utilities.py
index fb0cfe426d..fb0cfe426d 100644
--- a/src/python/src/grpc/framework/alpha/_face_utilities.py
+++ b/src/python/grpcio/grpc/framework/alpha/_face_utilities.py
diff --git a/src/python/src/grpc/framework/alpha/_reexport.py b/src/python/grpcio/grpc/framework/alpha/_reexport.py
index 198cb95ad5..198cb95ad5 100644
--- a/src/python/src/grpc/framework/alpha/_reexport.py
+++ b/src/python/grpcio/grpc/framework/alpha/_reexport.py
diff --git a/src/python/src/grpc/framework/alpha/exceptions.py b/src/python/grpcio/grpc/framework/alpha/exceptions.py
index 5234d3b91c..5234d3b91c 100644
--- a/src/python/src/grpc/framework/alpha/exceptions.py
+++ b/src/python/grpcio/grpc/framework/alpha/exceptions.py
diff --git a/src/python/src/grpc/framework/alpha/interfaces.py b/src/python/grpcio/grpc/framework/alpha/interfaces.py
index 8380567c97..8380567c97 100644
--- a/src/python/src/grpc/framework/alpha/interfaces.py
+++ b/src/python/grpcio/grpc/framework/alpha/interfaces.py
diff --git a/src/python/src/grpc/framework/alpha/utilities.py b/src/python/grpcio/grpc/framework/alpha/utilities.py
index 7d7f78f5e4..7d7f78f5e4 100644
--- a/src/python/src/grpc/framework/alpha/utilities.py
+++ b/src/python/grpcio/grpc/framework/alpha/utilities.py
diff --git a/src/python/src/grpc/early_adopter/__init__.py b/src/python/grpcio/grpc/framework/base/__init__.py
index 7086519106..7086519106 100644
--- a/src/python/src/grpc/early_adopter/__init__.py
+++ b/src/python/grpcio/grpc/framework/base/__init__.py
diff --git a/src/python/src/grpc/framework/base/_cancellation.py b/src/python/grpcio/grpc/framework/base/_cancellation.py
index ffbc90668f..ffbc90668f 100644
--- a/src/python/src/grpc/framework/base/_cancellation.py
+++ b/src/python/grpcio/grpc/framework/base/_cancellation.py
diff --git a/src/python/src/grpc/framework/base/_constants.py b/src/python/grpcio/grpc/framework/base/_constants.py
index 8fbdc82782..8fbdc82782 100644
--- a/src/python/src/grpc/framework/base/_constants.py
+++ b/src/python/grpcio/grpc/framework/base/_constants.py
diff --git a/src/python/src/grpc/framework/base/_context.py b/src/python/grpcio/grpc/framework/base/_context.py
index d84871d639..d84871d639 100644
--- a/src/python/src/grpc/framework/base/_context.py
+++ b/src/python/grpcio/grpc/framework/base/_context.py
diff --git a/src/python/src/grpc/framework/base/_emission.py b/src/python/grpcio/grpc/framework/base/_emission.py
index 1829669a72..1829669a72 100644
--- a/src/python/src/grpc/framework/base/_emission.py
+++ b/src/python/grpcio/grpc/framework/base/_emission.py
diff --git a/src/python/src/grpc/framework/base/_ends.py b/src/python/grpcio/grpc/framework/base/_ends.py
index 176f3ac06e..176f3ac06e 100644
--- a/src/python/src/grpc/framework/base/_ends.py
+++ b/src/python/grpcio/grpc/framework/base/_ends.py
diff --git a/src/python/src/grpc/framework/base/_expiration.py b/src/python/grpcio/grpc/framework/base/_expiration.py
index 17acbef4c1..17acbef4c1 100644
--- a/src/python/src/grpc/framework/base/_expiration.py
+++ b/src/python/grpcio/grpc/framework/base/_expiration.py
diff --git a/src/python/src/grpc/framework/base/_ingestion.py b/src/python/grpcio/grpc/framework/base/_ingestion.py
index 06d5b92f0b..06d5b92f0b 100644
--- a/src/python/src/grpc/framework/base/_ingestion.py
+++ b/src/python/grpcio/grpc/framework/base/_ingestion.py
diff --git a/src/python/src/grpc/framework/base/_interfaces.py b/src/python/grpcio/grpc/framework/base/_interfaces.py
index d88cf76590..d88cf76590 100644
--- a/src/python/src/grpc/framework/base/_interfaces.py
+++ b/src/python/grpcio/grpc/framework/base/_interfaces.py
diff --git a/src/python/src/grpc/framework/base/_reception.py b/src/python/grpcio/grpc/framework/base/_reception.py
index dd428964f1..dd428964f1 100644
--- a/src/python/src/grpc/framework/base/_reception.py
+++ b/src/python/grpcio/grpc/framework/base/_reception.py
diff --git a/src/python/src/grpc/framework/base/_termination.py b/src/python/grpcio/grpc/framework/base/_termination.py
index ddcbc60293..ddcbc60293 100644
--- a/src/python/src/grpc/framework/base/_termination.py
+++ b/src/python/grpcio/grpc/framework/base/_termination.py
diff --git a/src/python/src/grpc/framework/base/_transmission.py b/src/python/grpcio/grpc/framework/base/_transmission.py
index 6845129234..6845129234 100644
--- a/src/python/src/grpc/framework/base/_transmission.py
+++ b/src/python/grpcio/grpc/framework/base/_transmission.py
diff --git a/src/python/src/grpc/framework/base/exceptions.py b/src/python/grpcio/grpc/framework/base/exceptions.py
index b8f4752184..b8f4752184 100644
--- a/src/python/src/grpc/framework/base/exceptions.py
+++ b/src/python/grpcio/grpc/framework/base/exceptions.py
diff --git a/src/python/src/grpc/framework/base/implementations.py b/src/python/grpcio/grpc/framework/base/implementations.py
index 5656f9f981..5656f9f981 100644
--- a/src/python/src/grpc/framework/base/implementations.py
+++ b/src/python/grpcio/grpc/framework/base/implementations.py
diff --git a/src/python/src/grpc/framework/base/in_memory.py b/src/python/grpcio/grpc/framework/base/in_memory.py
index c92d0bc663..c92d0bc663 100644
--- a/src/python/src/grpc/framework/base/in_memory.py
+++ b/src/python/grpcio/grpc/framework/base/in_memory.py
diff --git a/src/python/src/grpc/framework/base/interfaces.py b/src/python/grpcio/grpc/framework/base/interfaces.py
index e22c10d975..e22c10d975 100644
--- a/src/python/src/grpc/framework/base/interfaces.py
+++ b/src/python/grpcio/grpc/framework/base/interfaces.py
diff --git a/src/python/src/grpc/framework/base/null.py b/src/python/grpcio/grpc/framework/base/null.py
index 1e30d4557b..1e30d4557b 100644
--- a/src/python/src/grpc/framework/base/null.py
+++ b/src/python/grpcio/grpc/framework/base/null.py
diff --git a/src/python/src/grpc/framework/base/util.py b/src/python/grpcio/grpc/framework/base/util.py
index c832c826cf..c832c826cf 100644
--- a/src/python/src/grpc/framework/base/util.py
+++ b/src/python/grpcio/grpc/framework/base/util.py
diff --git a/src/python/src/grpc/framework/__init__.py b/src/python/grpcio/grpc/framework/common/__init__.py
index 7086519106..7086519106 100644
--- a/src/python/src/grpc/framework/__init__.py
+++ b/src/python/grpcio/grpc/framework/common/__init__.py
diff --git a/src/python/src/grpc/framework/common/cardinality.py b/src/python/grpcio/grpc/framework/common/cardinality.py
index 610425e803..610425e803 100644
--- a/src/python/src/grpc/framework/common/cardinality.py
+++ b/src/python/grpcio/grpc/framework/common/cardinality.py
diff --git a/src/python/src/grpc/framework/common/style.py b/src/python/grpcio/grpc/framework/common/style.py
index 6ae694bdcb..6ae694bdcb 100644
--- a/src/python/src/grpc/framework/common/style.py
+++ b/src/python/grpcio/grpc/framework/common/style.py
diff --git a/src/python/src/grpc/framework/base/__init__.py b/src/python/grpcio/grpc/framework/face/__init__.py
index 7086519106..7086519106 100644
--- a/src/python/src/grpc/framework/base/__init__.py
+++ b/src/python/grpcio/grpc/framework/face/__init__.py
diff --git a/src/python/src/grpc/framework/face/_calls.py b/src/python/grpcio/grpc/framework/face/_calls.py
index 87edeb0f0e..87edeb0f0e 100644
--- a/src/python/src/grpc/framework/face/_calls.py
+++ b/src/python/grpcio/grpc/framework/face/_calls.py
diff --git a/src/python/src/grpc/framework/face/_control.py b/src/python/grpcio/grpc/framework/face/_control.py
index e918907b74..e918907b74 100644
--- a/src/python/src/grpc/framework/face/_control.py
+++ b/src/python/grpcio/grpc/framework/face/_control.py
diff --git a/src/python/src/grpc/framework/face/_service.py b/src/python/grpcio/grpc/framework/face/_service.py
index cdf413356a..cdf413356a 100644
--- a/src/python/src/grpc/framework/face/_service.py
+++ b/src/python/grpcio/grpc/framework/face/_service.py
diff --git a/src/python/src/grpc/framework/face/demonstration.py b/src/python/grpcio/grpc/framework/face/demonstration.py
index f6b4b609ff..f6b4b609ff 100644
--- a/src/python/src/grpc/framework/face/demonstration.py
+++ b/src/python/grpcio/grpc/framework/face/demonstration.py
diff --git a/src/python/src/grpc/framework/face/exceptions.py b/src/python/grpcio/grpc/framework/face/exceptions.py
index f112df70bc..f112df70bc 100644
--- a/src/python/src/grpc/framework/face/exceptions.py
+++ b/src/python/grpcio/grpc/framework/face/exceptions.py
diff --git a/src/python/src/grpc/framework/face/implementations.py b/src/python/grpcio/grpc/framework/face/implementations.py
index 4a6de52974..4a6de52974 100644
--- a/src/python/src/grpc/framework/face/implementations.py
+++ b/src/python/grpcio/grpc/framework/face/implementations.py
diff --git a/src/python/src/grpc/framework/face/interfaces.py b/src/python/grpcio/grpc/framework/face/interfaces.py
index b7cc4c1169..b7cc4c1169 100644
--- a/src/python/src/grpc/framework/face/interfaces.py
+++ b/src/python/grpcio/grpc/framework/face/interfaces.py
diff --git a/src/python/src/grpc/framework/face/utilities.py b/src/python/grpcio/grpc/framework/face/utilities.py
index a63fe8c60d..a63fe8c60d 100644
--- a/src/python/src/grpc/framework/face/utilities.py
+++ b/src/python/grpcio/grpc/framework/face/utilities.py
diff --git a/src/python/src/grpc/framework/common/__init__.py b/src/python/grpcio/grpc/framework/foundation/__init__.py
index 7086519106..7086519106 100644
--- a/src/python/src/grpc/framework/common/__init__.py
+++ b/src/python/grpcio/grpc/framework/foundation/__init__.py
diff --git a/src/python/src/grpc/framework/foundation/_timer_future.py b/src/python/grpcio/grpc/framework/foundation/_timer_future.py
index 2c9996aa9d..2c9996aa9d 100644
--- a/src/python/src/grpc/framework/foundation/_timer_future.py
+++ b/src/python/grpcio/grpc/framework/foundation/_timer_future.py
diff --git a/src/python/src/grpc/framework/foundation/abandonment.py b/src/python/grpcio/grpc/framework/foundation/abandonment.py
index 960b4d06b4..960b4d06b4 100644
--- a/src/python/src/grpc/framework/foundation/abandonment.py
+++ b/src/python/grpcio/grpc/framework/foundation/abandonment.py
diff --git a/src/python/src/grpc/framework/foundation/activated.py b/src/python/grpcio/grpc/framework/foundation/activated.py
index 426a71c705..426a71c705 100644
--- a/src/python/src/grpc/framework/foundation/activated.py
+++ b/src/python/grpcio/grpc/framework/foundation/activated.py
diff --git a/src/python/src/grpc/framework/foundation/callable_util.py b/src/python/grpcio/grpc/framework/foundation/callable_util.py
index 32b0751a01..32b0751a01 100644
--- a/src/python/src/grpc/framework/foundation/callable_util.py
+++ b/src/python/grpcio/grpc/framework/foundation/callable_util.py
diff --git a/src/python/src/grpc/framework/foundation/future.py b/src/python/grpcio/grpc/framework/foundation/future.py
index bfc16fc1ea..bfc16fc1ea 100644
--- a/src/python/src/grpc/framework/foundation/future.py
+++ b/src/python/grpcio/grpc/framework/foundation/future.py
diff --git a/src/python/src/grpc/framework/foundation/later.py b/src/python/grpcio/grpc/framework/foundation/later.py
index 1d1e065041..1d1e065041 100644
--- a/src/python/src/grpc/framework/foundation/later.py
+++ b/src/python/grpcio/grpc/framework/foundation/later.py
diff --git a/src/python/src/grpc/framework/foundation/logging_pool.py b/src/python/grpcio/grpc/framework/foundation/logging_pool.py
index 7c7a6eebfc..7c7a6eebfc 100644
--- a/src/python/src/grpc/framework/foundation/logging_pool.py
+++ b/src/python/grpcio/grpc/framework/foundation/logging_pool.py
diff --git a/src/python/src/grpc/framework/foundation/relay.py b/src/python/grpcio/grpc/framework/foundation/relay.py
index 9c23946552..9c23946552 100644
--- a/src/python/src/grpc/framework/foundation/relay.py
+++ b/src/python/grpcio/grpc/framework/foundation/relay.py
diff --git a/src/python/src/grpc/framework/foundation/stream.py b/src/python/grpcio/grpc/framework/foundation/stream.py
index 75c0cf145b..75c0cf145b 100644
--- a/src/python/src/grpc/framework/foundation/stream.py
+++ b/src/python/grpcio/grpc/framework/foundation/stream.py
diff --git a/src/python/src/grpc/framework/foundation/stream_util.py b/src/python/grpcio/grpc/framework/foundation/stream_util.py
index 2210e4efcf..2210e4efcf 100644
--- a/src/python/src/grpc/framework/foundation/stream_util.py
+++ b/src/python/grpcio/grpc/framework/foundation/stream_util.py
diff --git a/src/python/src/grpc/framework/face/__init__.py b/src/python/grpcio/grpc/framework/interfaces/__init__.py
index 7086519106..7086519106 100644
--- a/src/python/src/grpc/framework/face/__init__.py
+++ b/src/python/grpcio/grpc/framework/interfaces/__init__.py
diff --git a/src/python/src/grpc/framework/face/testing/__init__.py b/src/python/grpcio/grpc/framework/interfaces/links/__init__.py
index 7086519106..7086519106 100644
--- a/src/python/src/grpc/framework/face/testing/__init__.py
+++ b/src/python/grpcio/grpc/framework/interfaces/links/__init__.py
diff --git a/src/python/src/grpc/framework/interfaces/links/links.py b/src/python/grpcio/grpc/framework/interfaces/links/links.py
index 5ebbac8a6f..5ebbac8a6f 100644
--- a/src/python/src/grpc/framework/interfaces/links/links.py
+++ b/src/python/grpcio/grpc/framework/interfaces/links/links.py
diff --git a/src/python/src/grpc/framework/interfaces/links/utilities.py b/src/python/grpcio/grpc/framework/interfaces/links/utilities.py
index 6e4fd76d93..6e4fd76d93 100644
--- a/src/python/src/grpc/framework/interfaces/links/utilities.py
+++ b/src/python/grpcio/grpc/framework/interfaces/links/utilities.py
diff --git a/src/python/requirements.txt b/src/python/grpcio/requirements.txt
index 43395df03b..43395df03b 100644
--- a/src/python/requirements.txt
+++ b/src/python/grpcio/requirements.txt
diff --git a/src/python/grpcio/setup.cfg b/src/python/grpcio/setup.cfg
new file mode 100644
index 0000000000..8f69613632
--- /dev/null
+++ b/src/python/grpcio/setup.cfg
@@ -0,0 +1,2 @@
+[build_ext]
+inplace=1
diff --git a/src/python/src/setup.py b/src/python/grpcio/setup.py
index a857ae98cc..caa71a4f7c 100644
--- a/src/python/src/setup.py
+++ b/src/python/grpcio/setup.py
@@ -30,11 +30,17 @@
 """A setup module for the GRPC Python package."""
 
 import os
+import os.path
 import sys
 
 from distutils import core as _core
 import setuptools
 
+# Ensure we're in the proper directory whether or not we're being used by pip.
+os.chdir(os.path.dirname(os.path.abspath(__file__)))
+
+# Break import-style to ensure we can actually find our commands module.
+import commands
 
 # Use environment variables to determine whether or not the Cython extension
 # should *use* Cython or use the generated C files. Note that this requires the
@@ -73,29 +79,27 @@ _C_EXTENSION_MODULE = _core.Extension(
 _EXTENSION_MODULES = [_C_EXTENSION_MODULE]
 
 _PACKAGES = (
-    'grpc',
-    'grpc._adapter',
-    'grpc._junkdrawer',
-    'grpc._links',
-    'grpc.early_adopter',
-    'grpc.framework',
-    'grpc.framework.alpha',
-    'grpc.framework.base',
-    'grpc.framework.common',
-    'grpc.framework.face',
-    'grpc.framework.face.testing',
-    'grpc.framework.foundation',
-    'grpc.framework.interfaces',
-    'grpc.framework.interfaces.links',
+    setuptools.find_packages('.', exclude=['*._cython', '*._cython.*'])
 )
 
 _PACKAGE_DIRECTORIES = {
-    'grpc': 'grpc',
-    'grpc._adapter': 'grpc/_adapter',
-    'grpc._junkdrawer': 'grpc/_junkdrawer',
-    'grpc._links': 'grpc/_links',
-    'grpc.early_adopter': 'grpc/early_adopter',
-    'grpc.framework': 'grpc/framework',
+    '': '.',
+}
+
+_INSTALL_REQUIRES = (
+    'enum34==1.0.4',
+    'futures==2.2.0',
+    'protobuf==3.0.0a3',
+)
+
+_SETUP_REQUIRES = (
+    'sphinx>=1.3',
+) + _INSTALL_REQUIRES
+
+_COMMAND_CLASS = {
+    'doc': commands.SphinxDocumentation,
+    'build_project_metadata': commands.BuildProjectMetadata,
+    'build_py': commands.BuildPy,
 }
 
 setuptools.setup(
@@ -104,9 +108,7 @@ setuptools.setup(
     ext_modules=_EXTENSION_MODULES,
     packages=list(_PACKAGES),
     package_dir=_PACKAGE_DIRECTORIES,
-    install_requires=[
-        'enum34==1.0.4',
-        'futures==2.2.0',
-        'protobuf==3.0.0a3'
-    ]
+    install_requires=_INSTALL_REQUIRES,
+    setup_requires=_SETUP_REQUIRES,
+    cmdclass=_COMMAND_CLASS
 )
diff --git a/src/python/grpcio_test/.gitignore b/src/python/grpcio_test/.gitignore
new file mode 100644
index 0000000000..218e3a15ab
--- /dev/null
+++ b/src/python/grpcio_test/.gitignore
@@ -0,0 +1,10 @@
+MANIFEST
+*.egg-info/
+build/
+dist/
+*.egg
+*.egg/
+*.eggs/
+.coverage
+.coverage.*
+nosetests.xml
diff --git a/src/python/grpcio_test/MANIFEST.in b/src/python/grpcio_test/MANIFEST.in
new file mode 100644
index 0000000000..c9327307dc
--- /dev/null
+++ b/src/python/grpcio_test/MANIFEST.in
@@ -0,0 +1,4 @@
+graft grpc_interop
+graft grpc_test
+include commands.py
+include requirements.txt
diff --git a/src/python/grpcio_test/commands.py b/src/python/grpcio_test/commands.py
new file mode 100644
index 0000000000..c796d94c76
--- /dev/null
+++ b/src/python/grpcio_test/commands.py
@@ -0,0 +1,57 @@
+# Copyright 2015, Google Inc.
+# All rights reserved.
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions are
+# met:
+#
+#     * Redistributions of source code must retain the above copyright
+# notice, this list of conditions and the following disclaimer.
+#     * Redistributions in binary form must reproduce the above
+# copyright notice, this list of conditions and the following disclaimer
+# in the documentation and/or other materials provided with the
+# distribution.
+#     * Neither the name of Google Inc. nor the names of its
+# contributors may be used to endorse or promote products derived from
+# this software without specific prior written permission.
+#
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+"""Provides distutils command classes for the GRPC Python test setup process."""
+
+import os
+import os.path
+import sys
+
+import setuptools
+
+
+class RunTests(setuptools.Command):
+  """Command to run all tests via py.test."""
+
+  description = ''
+  user_options = [('pytest-args=', 'a', 'arguments to pass to py.test')]
+
+  def initialize_options(self):
+    self.pytest_args = []
+
+  def finalize_options(self):
+    pass
+
+  def run(self):
+    # We import here to ensure that setup.py has had a chance to install the
+    # relevant package eggs first.
+    import pytest
+    result = pytest.main(self.pytest_args)
+    if result != 0:
+      raise SystemExit(result)
diff --git a/src/python/src/grpc/framework/foundation/__init__.py b/src/python/grpcio_test/grpc_interop/__init__.py
index 7086519106..7086519106 100644
--- a/src/python/src/grpc/framework/foundation/__init__.py
+++ b/src/python/grpcio_test/grpc_interop/__init__.py
diff --git a/src/python/interop/interop/_insecure_interop_test.py b/src/python/grpcio_test/grpc_interop/_insecure_interop_test.py
index 98ea3a6648..825988a072 100644
--- a/src/python/interop/interop/_insecure_interop_test.py
+++ b/src/python/grpcio_test/grpc_interop/_insecure_interop_test.py
@@ -33,8 +33,8 @@ import unittest
 
 from grpc.early_adopter import implementations
 
-from interop import _interop_test_case
-from interop import methods
+from grpc_interop import _interop_test_case
+from grpc_interop import methods
 
 
 class InsecureInteropTest(
diff --git a/src/python/interop/interop/_interop_test_case.py b/src/python/grpcio_test/grpc_interop/_interop_test_case.py
index f40ef0ec83..ed8f7ef009 100644
--- a/src/python/interop/interop/_interop_test_case.py
+++ b/src/python/grpcio_test/grpc_interop/_interop_test_case.py
@@ -29,7 +29,7 @@
 
 """Common code for unit tests of the interoperability test code."""
 
-from interop import methods
+from grpc_interop import methods
 
 
 class InteropTestCase(object):
diff --git a/src/python/interop/interop/_secure_interop_test.py b/src/python/grpcio_test/grpc_interop/_secure_interop_test.py
index be7618f549..a2682dee99 100644
--- a/src/python/interop/interop/_secure_interop_test.py
+++ b/src/python/grpcio_test/grpc_interop/_secure_interop_test.py
@@ -33,9 +33,9 @@ import unittest
 
 from grpc.early_adopter import implementations
 
-from interop import _interop_test_case
-from interop import methods
-from interop import resources
+from grpc_interop import _interop_test_case
+from grpc_interop import methods
+from grpc_interop import resources
 
 _SERVER_HOST_OVERRIDE = 'foo.test.google.fr'
 
diff --git a/src/python/interop/interop/client.py b/src/python/grpcio_test/grpc_interop/client.py
index 41f0d94539..2dd2103cbe 100644
--- a/src/python/interop/interop/client.py
+++ b/src/python/grpcio_test/grpc_interop/client.py
@@ -34,8 +34,8 @@ from oauth2client import client as oauth2client_client
 
 from grpc.early_adopter import implementations
 
-from interop import methods
-from interop import resources
+from grpc_interop import methods
+from grpc_interop import resources
 
 _ONE_DAY_IN_SECONDS = 60 * 60 * 24
 
diff --git a/src/python/interop/interop/credentials/README b/src/python/grpcio_test/grpc_interop/credentials/README
index cb20dcb49f..cb20dcb49f 100644
--- a/src/python/interop/interop/credentials/README
+++ b/src/python/grpcio_test/grpc_interop/credentials/README
diff --git a/src/python/grpcio_test/grpc_interop/credentials/ca.pem b/src/python/grpcio_test/grpc_interop/credentials/ca.pem
new file mode 100755
index 0000000000..6c8511a73c
--- /dev/null
+++ b/src/python/grpcio_test/grpc_interop/credentials/ca.pem
@@ -0,0 +1,15 @@
+-----BEGIN CERTIFICATE-----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+-----END CERTIFICATE-----
diff --git a/src/python/interop/interop/credentials/server1.key b/src/python/grpcio_test/grpc_interop/credentials/server1.key
index 143a5b8765..143a5b8765 100755
--- a/src/python/interop/interop/credentials/server1.key
+++ b/src/python/grpcio_test/grpc_interop/credentials/server1.key
diff --git a/src/python/interop/interop/credentials/server1.pem b/src/python/grpcio_test/grpc_interop/credentials/server1.pem
index 8e582e571f..8e582e571f 100755
--- a/src/python/interop/interop/credentials/server1.pem
+++ b/src/python/grpcio_test/grpc_interop/credentials/server1.pem
diff --git a/src/python/interop/interop/empty_pb2.py b/src/python/grpcio_test/grpc_interop/empty_pb2.py
index 8c1ce2f13e..8c1ce2f13e 100644
--- a/src/python/interop/interop/empty_pb2.py
+++ b/src/python/grpcio_test/grpc_interop/empty_pb2.py
diff --git a/src/python/interop/interop/messages_pb2.py b/src/python/grpcio_test/grpc_interop/messages_pb2.py
index 0bf3d86a31..0bf3d86a31 100644
--- a/src/python/interop/interop/messages_pb2.py
+++ b/src/python/grpcio_test/grpc_interop/messages_pb2.py
diff --git a/src/python/interop/interop/methods.py b/src/python/grpcio_test/grpc_interop/methods.py
index 194afadb17..f4c94685ee 100644
--- a/src/python/interop/interop/methods.py
+++ b/src/python/grpcio_test/grpc_interop/methods.py
@@ -38,8 +38,8 @@ from oauth2client import client as oauth2client_client
 
 from grpc.framework.alpha import utilities
 
-from interop import empty_pb2
-from interop import messages_pb2
+from grpc_interop import empty_pb2
+from grpc_interop import messages_pb2
 
 _TIMEOUT = 7
 
diff --git a/src/python/interop/interop/resources.py b/src/python/grpcio_test/grpc_interop/resources.py
index 2c3045313d..2c3045313d 100644
--- a/src/python/interop/interop/resources.py
+++ b/src/python/grpcio_test/grpc_interop/resources.py
diff --git a/src/python/interop/interop/server.py b/src/python/grpcio_test/grpc_interop/server.py
index a67d412038..60f630a6be 100644
--- a/src/python/interop/interop/server.py
+++ b/src/python/grpcio_test/grpc_interop/server.py
@@ -35,8 +35,8 @@ import time
 
 from grpc.early_adopter import implementations
 
-from interop import methods
-from interop import resources
+from grpc_interop import methods
+from grpc_interop import resources
 
 _ONE_DAY_IN_SECONDS = 60 * 60 * 24
 
diff --git a/src/python/interop/interop/test_pb2.py b/src/python/grpcio_test/grpc_interop/test_pb2.py
index 71325d5a9f..71325d5a9f 100644
--- a/src/python/interop/interop/test_pb2.py
+++ b/src/python/grpcio_test/grpc_interop/test_pb2.py
diff --git a/src/python/src/grpc/framework/interfaces/__init__.py b/src/python/grpcio_test/grpc_test/__init__.py
index 7086519106..7086519106 100644
--- a/src/python/src/grpc/framework/interfaces/__init__.py
+++ b/src/python/grpcio_test/grpc_test/__init__.py
diff --git a/src/python/grpcio_test/grpc_test/_adapter/.gitignore b/src/python/grpcio_test/grpc_test/_adapter/.gitignore
new file mode 100644
index 0000000000..a6f96cd6db
--- /dev/null
+++ b/src/python/grpcio_test/grpc_test/_adapter/.gitignore
@@ -0,0 +1,5 @@
+*.a
+*.so
+*.dll
+*.pyc
+*.pyd
diff --git a/src/python/src/grpc/framework/interfaces/links/__init__.py b/src/python/grpcio_test/grpc_test/_adapter/__init__.py
index 7086519106..7086519106 100644
--- a/src/python/src/grpc/framework/interfaces/links/__init__.py
+++ b/src/python/grpcio_test/grpc_test/_adapter/__init__.py
diff --git a/src/python/src/grpc/_adapter/_blocking_invocation_inline_service_test.py b/src/python/grpcio_test/grpc_test/_adapter/_blocking_invocation_inline_service_test.py
index 7a8ff0ad89..a1f776211c 100644
--- a/src/python/src/grpc/_adapter/_blocking_invocation_inline_service_test.py
+++ b/src/python/grpcio_test/grpc_test/_adapter/_blocking_invocation_inline_service_test.py
@@ -31,8 +31,8 @@
 
 import unittest
 
-from grpc._adapter import _face_test_case
-from grpc.framework.face.testing import blocking_invocation_inline_service_test_case as test_case
+from grpc_test._adapter import _face_test_case
+from grpc_test.framework.face.testing import blocking_invocation_inline_service_test_case as test_case
 
 
 class BlockingInvocationInlineServiceTest(
diff --git a/src/python/src/grpc/_adapter/_c_test.py b/src/python/grpcio_test/grpc_test/_adapter/_c_test.py
index 133b124072..fe020e2a9c 100644
--- a/src/python/src/grpc/_adapter/_c_test.py
+++ b/src/python/grpcio_test/grpc_test/_adapter/_c_test.py
@@ -36,14 +36,6 @@ from grpc._adapter import _types
 
 class CTypeSmokeTest(unittest.TestCase):
 
-  def testClientCredentialsUpDown(self):
-    credentials = _c.ClientCredentials.fake_transport_security()
-    del credentials
-
-  def testServerCredentialsUpDown(self):
-    credentials = _c.ServerCredentials.fake_transport_security()
-    del credentials
-
   def testCompletionQueueUpDown(self):
     completion_queue = _c.CompletionQueue()
     del completion_queue
@@ -58,10 +50,6 @@ class CTypeSmokeTest(unittest.TestCase):
     channel = _c.Channel('[::]:0', [])
     del channel
 
-  def testSecureChannelUpDown(self):
-    channel = _c.Channel('[::]:0', [], _c.ClientCredentials.fake_transport_security())
-    del channel
-
 
 if __name__ == '__main__':
   unittest.main(verbosity=2)
diff --git a/src/python/src/grpc/_adapter/_event_invocation_synchronous_event_service_test.py b/src/python/grpcio_test/grpc_test/_adapter/_event_invocation_synchronous_event_service_test.py
index b8ceb75d68..0d01ebc8dc 100644
--- a/src/python/src/grpc/_adapter/_event_invocation_synchronous_event_service_test.py
+++ b/src/python/grpcio_test/grpc_test/_adapter/_event_invocation_synchronous_event_service_test.py
@@ -31,8 +31,8 @@
 
 import unittest
 
-from grpc._adapter import _face_test_case
-from grpc.framework.face.testing import event_invocation_synchronous_event_service_test_case as test_case
+from grpc_test._adapter import _face_test_case
+from grpc_test.framework.face.testing import event_invocation_synchronous_event_service_test_case as test_case
 
 
 class EventInvocationSynchronousEventServiceTest(
diff --git a/src/python/src/grpc/_adapter/_face_test_case.py b/src/python/grpcio_test/grpc_test/_adapter/_face_test_case.py
index 5fa974ed06..dfbd0b60af 100644
--- a/src/python/src/grpc/_adapter/_face_test_case.py
+++ b/src/python/grpcio_test/grpc_test/_adapter/_face_test_case.py
@@ -36,10 +36,10 @@ from grpc._adapter import rear
 from grpc.framework.base import util
 from grpc.framework.base import implementations as base_implementations
 from grpc.framework.face import implementations as face_implementations
-from grpc.framework.face.testing import coverage
-from grpc.framework.face.testing import serial
-from grpc.framework.face.testing import test_case
 from grpc.framework.foundation import logging_pool
+from grpc_test.framework.face.testing import coverage
+from grpc_test.framework.face.testing import serial
+from grpc_test.framework.face.testing import test_case
 
 _TIMEOUT = 3
 _MAXIMUM_TIMEOUT = 90
diff --git a/src/python/src/grpc/_adapter/_future_invocation_asynchronous_event_service_test.py b/src/python/grpcio_test/grpc_test/_adapter/_future_invocation_asynchronous_event_service_test.py
index 3773e65575..ea4a6a0bae 100644
--- a/src/python/src/grpc/_adapter/_future_invocation_asynchronous_event_service_test.py
+++ b/src/python/grpcio_test/grpc_test/_adapter/_future_invocation_asynchronous_event_service_test.py
@@ -31,8 +31,8 @@
 
 import unittest
 
-from grpc._adapter import _face_test_case
-from grpc.framework.face.testing import future_invocation_asynchronous_event_service_test_case as test_case
+from grpc_test._adapter import _face_test_case
+from grpc_test.framework.face.testing import future_invocation_asynchronous_event_service_test_case as test_case
 
 
 class FutureInvocationAsynchronousEventServiceTest(
diff --git a/src/python/src/grpc/_adapter/_intermediary_low_test.py b/src/python/grpcio_test/grpc_test/_adapter/_intermediary_low_test.py
index 27a5b82e9c..27a5b82e9c 100644
--- a/src/python/src/grpc/_adapter/_intermediary_low_test.py
+++ b/src/python/grpcio_test/grpc_test/_adapter/_intermediary_low_test.py
diff --git a/src/python/src/grpc/_adapter/_links_test.py b/src/python/grpcio_test/grpc_test/_adapter/_links_test.py
index 4729b84f84..c4686b327a 100644
--- a/src/python/src/grpc/_adapter/_links_test.py
+++ b/src/python/grpcio_test/grpc_test/_adapter/_links_test.py
@@ -32,12 +32,12 @@
 import threading
 import unittest
 
-from grpc._adapter import _proto_scenarios
-from grpc._adapter import _test_links
 from grpc._adapter import fore
 from grpc._adapter import rear
 from grpc.framework.base import interfaces
 from grpc.framework.foundation import logging_pool
+from grpc_test._adapter import _proto_scenarios
+from grpc_test._adapter import _test_links
 
 _IDENTITY = lambda x: x
 _TIMEOUT = 32
diff --git a/src/python/src/grpc/_adapter/_lonely_rear_link_test.py b/src/python/grpcio_test/grpc_test/_adapter/_lonely_rear_link_test.py
index 7f5021f40e..9b5758f60f 100644
--- a/src/python/src/grpc/_adapter/_lonely_rear_link_test.py
+++ b/src/python/grpcio_test/grpc_test/_adapter/_lonely_rear_link_test.py
@@ -31,10 +31,10 @@
 
 import unittest
 
-from grpc._adapter import _test_links
 from grpc._adapter import rear
 from grpc.framework.base import interfaces
 from grpc.framework.foundation import logging_pool
+from grpc_test._adapter import _test_links
 
 _IDENTITY = lambda x: x
 _TIMEOUT = 2
diff --git a/src/python/src/grpc/_adapter/_low_test.py b/src/python/grpcio_test/grpc_test/_adapter/_low_test.py
index a49cd007bf..9a8edfad0c 100644
--- a/src/python/src/grpc/_adapter/_low_test.py
+++ b/src/python/grpcio_test/grpc_test/_adapter/_low_test.py
@@ -97,7 +97,7 @@ class InsecureServerInsecureClient(unittest.TestCase):
     CLIENT_METADATA_BIN_VALUE = b'\0'*1000
     SERVER_INITIAL_METADATA_KEY = 'init_me_me_me'
     SERVER_INITIAL_METADATA_VALUE = 'whodawha?'
-    SERVER_TRAILING_METADATA_KEY = 'California_is_in_a_drought'
+    SERVER_TRAILING_METADATA_KEY = 'california_is_in_a_drought'
     SERVER_TRAILING_METADATA_VALUE = 'zomg it is'
     SERVER_STATUS_CODE = _types.StatusCode.OK
     SERVER_STATUS_DETAILS = 'our work is never over'
diff --git a/src/python/src/grpc/_adapter/_proto_scenarios.py b/src/python/grpcio_test/grpc_test/_adapter/_proto_scenarios.py
index 60a622ba8b..b3d6ec8607 100644
--- a/src/python/src/grpc/_adapter/_proto_scenarios.py
+++ b/src/python/grpcio_test/grpc_test/_adapter/_proto_scenarios.py
@@ -32,7 +32,7 @@
 import abc
 import threading
 
-from grpc._junkdrawer import math_pb2
+from grpc_test._junkdrawer import math_pb2
 
 
 class ProtoScenario(object):
diff --git a/src/python/src/grpc/_adapter/_test_links.py b/src/python/grpcio_test/grpc_test/_adapter/_test_links.py
index 86c7e61b17..86c7e61b17 100644
--- a/src/python/src/grpc/_adapter/_test_links.py
+++ b/src/python/grpcio_test/grpc_test/_adapter/_test_links.py
diff --git a/src/python/grpcio_test/grpc_test/_cython/.gitignore b/src/python/grpcio_test/grpc_test/_cython/.gitignore
new file mode 100644
index 0000000000..c315029288
--- /dev/null
+++ b/src/python/grpcio_test/grpc_test/_cython/.gitignore
@@ -0,0 +1,7 @@
+*.h
+*.c
+*.a
+*.so
+*.dll
+*.pyc
+*.pyd
diff --git a/src/python/grpcio_test/grpc_test/_cython/__init__.py b/src/python/grpcio_test/grpc_test/_cython/__init__.py
new file mode 100644
index 0000000000..b89398809f
--- /dev/null
+++ b/src/python/grpcio_test/grpc_test/_cython/__init__.py
@@ -0,0 +1,28 @@
+# Copyright 2015, Google Inc.
+# All rights reserved.
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions are
+# met:
+#
+#     * Redistributions of source code must retain the above copyright
+# notice, this list of conditions and the following disclaimer.
+#     * Redistributions in binary form must reproduce the above
+# copyright notice, this list of conditions and the following disclaimer
+# in the documentation and/or other materials provided with the
+# distribution.
+#     * Neither the name of Google Inc. nor the names of its
+# contributors may be used to endorse or promote products derived from
+# this software without specific prior written permission.
+#
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
diff --git a/src/python/src/grpc/_cython/adapter_low_test.py b/src/python/grpcio_test/grpc_test/_cython/adapter_low_test.py
index 9bab930e56..9bab930e56 100644
--- a/src/python/src/grpc/_cython/adapter_low_test.py
+++ b/src/python/grpcio_test/grpc_test/_cython/adapter_low_test.py
diff --git a/src/python/src/grpc/_cython/cygrpc_test.py b/src/python/grpcio_test/grpc_test/_cython/cygrpc_test.py
index 838e1e2254..637506b42e 100644
--- a/src/python/src/grpc/_cython/cygrpc_test.py
+++ b/src/python/grpcio_test/grpc_test/_cython/cygrpc_test.py
@@ -31,7 +31,7 @@ import time
 import unittest
 
 from grpc._cython import cygrpc
-from grpc._cython import test_utilities
+from grpc_test._cython import test_utilities
 
 
 class TypeSmokeTest(unittest.TestCase):
@@ -76,14 +76,6 @@ class TypeSmokeTest(unittest.TestCase):
     timespec = cygrpc.Timespec(now)
     self.assertAlmostEqual(now, float(timespec), places=8)
 
-  def testClientCredentialsUpDown(self):
-    credentials = cygrpc.client_credentials_fake_transport_security()
-    del credentials
-
-  def testServerCredentialsUpDown(self):
-    credentials = cygrpc.server_credentials_fake_transport_security()
-    del credentials
-
   def testCompletionQueueUpDown(self):
     completion_queue = cygrpc.CompletionQueue()
     del completion_queue
@@ -96,12 +88,6 @@ class TypeSmokeTest(unittest.TestCase):
     channel = cygrpc.Channel('[::]:0', cygrpc.ChannelArgs([]))
     del channel
 
-  def testSecureChannelUpDown(self):
-    channel = cygrpc.Channel(
-        '[::]:0', cygrpc.ChannelArgs([]),
-        cygrpc.client_credentials_fake_transport_security())
-    del channel
-
   @unittest.skip('TODO(atash): undo skip after #2229 is merged')
   def testServerStartNoExplicitShutdown(self):
     server = cygrpc.Server()
diff --git a/src/python/src/grpc/_cython/test_utilities.py b/src/python/grpcio_test/grpc_test/_cython/test_utilities.py
index 21ea3075b4..21ea3075b4 100644
--- a/src/python/src/grpc/_cython/test_utilities.py
+++ b/src/python/grpcio_test/grpc_test/_cython/test_utilities.py
diff --git a/src/python/interop/setup.py b/src/python/grpcio_test/grpc_test/_junkdrawer/__init__.py
index 75012b0d8f..7086519106 100644
--- a/src/python/interop/setup.py
+++ b/src/python/grpcio_test/grpc_test/_junkdrawer/__init__.py
@@ -27,31 +27,4 @@
 # (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 # OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
-"""A setup module for the GRPC Python interop testing package."""
 
-import setuptools
-
-_PACKAGES = (
-    'interop',
-)
-
-_PACKAGE_DIRECTORIES = {
-    'interop': 'interop',
-}
-
-_PACKAGE_DATA = {
-    'interop': [
-        'credentials/ca.pem', 'credentials/server1.key',
-        'credentials/server1.pem',]
-}
-
-_INSTALL_REQUIRES = ['oauth2client>=1.4.7', 'grpcio>=0.10.0a0']
-
-setuptools.setup(
-    name='interop',
-    version='0.0.1',
-    packages=_PACKAGES,
-    package_dir=_PACKAGE_DIRECTORIES,
-    package_data=_PACKAGE_DATA,
-    install_requires=_INSTALL_REQUIRES
-)
diff --git a/src/python/src/grpc/_junkdrawer/math_pb2.py b/src/python/grpcio_test/grpc_test/_junkdrawer/math_pb2.py
index 20165955b4..20165955b4 100644
--- a/src/python/src/grpc/_junkdrawer/math_pb2.py
+++ b/src/python/grpcio_test/grpc_test/_junkdrawer/math_pb2.py
diff --git a/src/python/src/grpc/_junkdrawer/stock_pb2.py b/src/python/grpcio_test/grpc_test/_junkdrawer/stock_pb2.py
index eef18f82d6..eef18f82d6 100644
--- a/src/python/src/grpc/_junkdrawer/stock_pb2.py
+++ b/src/python/grpcio_test/grpc_test/_junkdrawer/stock_pb2.py
diff --git a/src/python/grpcio_test/grpc_test/_links/__init__.py b/src/python/grpcio_test/grpc_test/_links/__init__.py
new file mode 100644
index 0000000000..7086519106
--- /dev/null
+++ b/src/python/grpcio_test/grpc_test/_links/__init__.py
@@ -0,0 +1,30 @@
+# Copyright 2015, Google Inc.
+# All rights reserved.
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions are
+# met:
+#
+#     * Redistributions of source code must retain the above copyright
+# notice, this list of conditions and the following disclaimer.
+#     * Redistributions in binary form must reproduce the above
+# copyright notice, this list of conditions and the following disclaimer
+# in the documentation and/or other materials provided with the
+# distribution.
+#     * Neither the name of Google Inc. nor the names of its
+# contributors may be used to endorse or promote products derived from
+# this software without specific prior written permission.
+#
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+
diff --git a/src/python/src/grpc/_links/_lonely_invocation_link_test.py b/src/python/grpcio_test/grpc_test/_links/_lonely_invocation_link_test.py
index 3d629f4387..abe240e07a 100644
--- a/src/python/src/grpc/_links/_lonely_invocation_link_test.py
+++ b/src/python/grpcio_test/grpc_test/_links/_lonely_invocation_link_test.py
@@ -33,10 +33,10 @@ import unittest
 
 from grpc._adapter import _intermediary_low
 from grpc._links import invocation
-from grpc.framework.common import test_constants
 from grpc.framework.interfaces.links import links
-from grpc.framework.interfaces.links import test_cases
-from grpc.framework.interfaces.links import test_utilities
+from grpc_test.framework.common import test_constants
+from grpc_test.framework.interfaces.links import test_cases
+from grpc_test.framework.interfaces.links import test_utilities
 
 _NULL_BEHAVIOR = lambda unused_argument: None
 
diff --git a/src/python/src/grpc/_links/_proto_scenarios.py b/src/python/grpcio_test/grpc_test/_links/_proto_scenarios.py
index ccf3c29782..0d74d66297 100644
--- a/src/python/src/grpc/_links/_proto_scenarios.py
+++ b/src/python/grpcio_test/grpc_test/_links/_proto_scenarios.py
@@ -32,7 +32,8 @@
 import abc
 import threading
 
-from grpc._junkdrawer import math_pb2
+from grpc_test._junkdrawer import math_pb2
+from grpc_test.framework.common import test_constants
 
 
 class ProtoScenario(object):
@@ -219,10 +220,9 @@ class BidirectionallyUnaryScenario(ProtoScenario):
 class BidirectionallyStreamingScenario(ProtoScenario):
   """A scenario that transmits no protocol buffers in either direction."""
 
-  _STREAM_LENGTH = 200
   _REQUESTS = tuple(
       math_pb2.DivArgs(dividend=59 + index, divisor=7 + index)
-      for index in range(_STREAM_LENGTH))
+      for index in range(test_constants.STREAM_LENGTH))
 
   def __init__(self):
     self._lock = threading.Lock()
diff --git a/src/python/src/grpc/_links/_transmission_test.py b/src/python/grpcio_test/grpc_test/_links/_transmission_test.py
index 3eeec03f46..9cdc9620f0 100644
--- a/src/python/src/grpc/_links/_transmission_test.py
+++ b/src/python/grpcio_test/grpc_test/_links/_transmission_test.py
@@ -32,13 +32,14 @@
 import unittest
 
 from grpc._adapter import _intermediary_low
-from grpc._links import _proto_scenarios
 from grpc._links import invocation
 from grpc._links import service
-from grpc.framework.common import test_constants
 from grpc.framework.interfaces.links import links
-from grpc.framework.interfaces.links import test_cases
-from grpc.framework.interfaces.links import test_utilities
+from grpc_test import test_common
+from grpc_test._links import _proto_scenarios
+from grpc_test.framework.common import test_constants
+from grpc_test.framework.interfaces.links import test_cases
+from grpc_test.framework.interfaces.links import test_utilities
 
 _IDENTITY = lambda x: x
 
@@ -94,12 +95,11 @@ class TransmissionTest(test_cases.TransmissionTest, unittest.TestCase):
     return _intermediary_low.Code.OK, 'An exuberant test "details" message!'
 
   def assertMetadataTransmitted(self, original_metadata, transmitted_metadata):
-    # we need to filter out any additional metadata added in transmitted_metadata
-    # since implementations are allowed to add to what is sent (in any position)
-    keys, _ = zip(*original_metadata)
-    self.assertSequenceEqual(
-        original_metadata,
-        [x for x in transmitted_metadata if x[0] in keys])
+    self.assertTrue(
+        test_common.metadata_transmitted(
+            original_metadata, transmitted_metadata),
+        '%s erroneously transmitted as %s' % (
+            original_metadata, transmitted_metadata))
 
 
 class RoundTripTest(unittest.TestCase):
diff --git a/src/python/grpcio_test/grpc_test/early_adopter/__init__.py b/src/python/grpcio_test/grpc_test/early_adopter/__init__.py
new file mode 100644
index 0000000000..7086519106
--- /dev/null
+++ b/src/python/grpcio_test/grpc_test/early_adopter/__init__.py
@@ -0,0 +1,30 @@
+# Copyright 2015, Google Inc.
+# All rights reserved.
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions are
+# met:
+#
+#     * Redistributions of source code must retain the above copyright
+# notice, this list of conditions and the following disclaimer.
+#     * Redistributions in binary form must reproduce the above
+# copyright notice, this list of conditions and the following disclaimer
+# in the documentation and/or other materials provided with the
+# distribution.
+#     * Neither the name of Google Inc. nor the names of its
+# contributors may be used to endorse or promote products derived from
+# this software without specific prior written permission.
+#
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+
diff --git a/src/python/src/grpc/early_adopter/implementations_test.py b/src/python/grpcio_test/grpc_test/early_adopter/implementations_test.py
index 49f0e949c4..611637e8b8 100644
--- a/src/python/src/grpc/early_adopter/implementations_test.py
+++ b/src/python/grpcio_test/grpc_test/early_adopter/implementations_test.py
@@ -35,7 +35,7 @@ import unittest
 
 from grpc.early_adopter import implementations
 from grpc.framework.alpha import utilities
-from grpc._junkdrawer import math_pb2
+from grpc_test._junkdrawer import math_pb2
 
 SERVICE_NAME = 'math.Math'
 
diff --git a/src/python/grpcio_test/grpc_test/framework/__init__.py b/src/python/grpcio_test/grpc_test/framework/__init__.py
new file mode 100644
index 0000000000..7086519106
--- /dev/null
+++ b/src/python/grpcio_test/grpc_test/framework/__init__.py
@@ -0,0 +1,30 @@
+# Copyright 2015, Google Inc.
+# All rights reserved.
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions are
+# met:
+#
+#     * Redistributions of source code must retain the above copyright
+# notice, this list of conditions and the following disclaimer.
+#     * Redistributions in binary form must reproduce the above
+# copyright notice, this list of conditions and the following disclaimer
+# in the documentation and/or other materials provided with the
+# distribution.
+#     * Neither the name of Google Inc. nor the names of its
+# contributors may be used to endorse or promote products derived from
+# this software without specific prior written permission.
+#
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+
diff --git a/src/python/grpcio_test/grpc_test/framework/base/__init__.py b/src/python/grpcio_test/grpc_test/framework/base/__init__.py
new file mode 100644
index 0000000000..7086519106
--- /dev/null
+++ b/src/python/grpcio_test/grpc_test/framework/base/__init__.py
@@ -0,0 +1,30 @@
+# Copyright 2015, Google Inc.
+# All rights reserved.
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions are
+# met:
+#
+#     * Redistributions of source code must retain the above copyright
+# notice, this list of conditions and the following disclaimer.
+#     * Redistributions in binary form must reproduce the above
+# copyright notice, this list of conditions and the following disclaimer
+# in the documentation and/or other materials provided with the
+# distribution.
+#     * Neither the name of Google Inc. nor the names of its
+# contributors may be used to endorse or promote products derived from
+# this software without specific prior written permission.
+#
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+
diff --git a/src/python/src/grpc/framework/base/implementations_test.py b/src/python/grpcio_test/grpc_test/framework/base/implementations_test.py
index 72087f4456..5a7d1398fd 100644
--- a/src/python/src/grpc/framework/base/implementations_test.py
+++ b/src/python/grpcio_test/grpc_test/framework/base/implementations_test.py
@@ -32,9 +32,9 @@
 import unittest
 
 from grpc.framework.base import implementations
-from grpc.framework.base import interfaces_test_case
 from grpc.framework.base import util
 from grpc.framework.foundation import logging_pool
+from grpc_test.framework.base import interfaces_test_case
 
 POOL_MAX_WORKERS = 10
 DEFAULT_TIMEOUT = 30
diff --git a/src/python/src/grpc/framework/base/interfaces_test_case.py b/src/python/grpcio_test/grpc_test/framework/base/interfaces_test_case.py
index dec10c2924..be775ad4e0 100644
--- a/src/python/src/grpc/framework/base/interfaces_test_case.py
+++ b/src/python/grpcio_test/grpc_test/framework/base/interfaces_test_case.py
@@ -35,8 +35,8 @@ import time
 from grpc.framework.base import interfaces
 from grpc.framework.base import util
 from grpc.framework.foundation import stream
-from grpc.framework.foundation import stream_testing
 from grpc.framework.foundation import stream_util
+from grpc_test.framework.foundation import stream_testing
 
 TICK = 0.1
 SMALL_TIMEOUT = TICK * 50
diff --git a/src/python/grpcio_test/grpc_test/framework/common/__init__.py b/src/python/grpcio_test/grpc_test/framework/common/__init__.py
new file mode 100644
index 0000000000..7086519106
--- /dev/null
+++ b/src/python/grpcio_test/grpc_test/framework/common/__init__.py
@@ -0,0 +1,30 @@
+# Copyright 2015, Google Inc.
+# All rights reserved.
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions are
+# met:
+#
+#     * Redistributions of source code must retain the above copyright
+# notice, this list of conditions and the following disclaimer.
+#     * Redistributions in binary form must reproduce the above
+# copyright notice, this list of conditions and the following disclaimer
+# in the documentation and/or other materials provided with the
+# distribution.
+#     * Neither the name of Google Inc. nor the names of its
+# contributors may be used to endorse or promote products derived from
+# this software without specific prior written permission.
+#
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+
diff --git a/src/python/src/grpc/framework/common/test_constants.py b/src/python/grpcio_test/grpc_test/framework/common/test_constants.py
index 237b8754ed..3126d0d82c 100644
--- a/src/python/src/grpc/framework/common/test_constants.py
+++ b/src/python/grpcio_test/grpc_test/framework/common/test_constants.py
@@ -35,3 +35,9 @@ SHORT_TIMEOUT = 4
 # Absurdly large value for maximum duration in seconds for should-not-time-out
 # RPCs made during tests.
 LONG_TIMEOUT = 3000
+
+# The number of payloads to transmit in streaming tests.
+STREAM_LENGTH = 200
+
+# The size of thread pools to use in tests.
+POOL_SIZE = 10
diff --git a/src/python/src/grpc/framework/common/test_control.py b/src/python/grpcio_test/grpc_test/framework/common/test_control.py
index 3960c4e649..3960c4e649 100644
--- a/src/python/src/grpc/framework/common/test_control.py
+++ b/src/python/grpcio_test/grpc_test/framework/common/test_control.py
diff --git a/src/python/src/grpc/framework/common/test_coverage.py b/src/python/grpcio_test/grpc_test/framework/common/test_coverage.py
index a7ed3582c4..a7ed3582c4 100644
--- a/src/python/src/grpc/framework/common/test_coverage.py
+++ b/src/python/grpcio_test/grpc_test/framework/common/test_coverage.py
diff --git a/src/python/grpcio_test/grpc_test/framework/face/__init__.py b/src/python/grpcio_test/grpc_test/framework/face/__init__.py
new file mode 100644
index 0000000000..7086519106
--- /dev/null
+++ b/src/python/grpcio_test/grpc_test/framework/face/__init__.py
@@ -0,0 +1,30 @@
+# Copyright 2015, Google Inc.
+# All rights reserved.
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions are
+# met:
+#
+#     * Redistributions of source code must retain the above copyright
+# notice, this list of conditions and the following disclaimer.
+#     * Redistributions in binary form must reproduce the above
+# copyright notice, this list of conditions and the following disclaimer
+# in the documentation and/or other materials provided with the
+# distribution.
+#     * Neither the name of Google Inc. nor the names of its
+# contributors may be used to endorse or promote products derived from
+# this software without specific prior written permission.
+#
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+
diff --git a/src/python/src/grpc/framework/face/_test_case.py b/src/python/grpcio_test/grpc_test/framework/face/_test_case.py
index 642d500628..486b6e630e 100644
--- a/src/python/src/grpc/framework/face/_test_case.py
+++ b/src/python/grpcio_test/grpc_test/framework/face/_test_case.py
@@ -30,9 +30,9 @@
 """Common lifecycle code for in-memory-ticket-exchange Face-layer tests."""
 
 from grpc.framework.face import implementations
-from grpc.framework.face.testing import base_util
-from grpc.framework.face.testing import test_case
 from grpc.framework.foundation import logging_pool
+from grpc_test.framework.face.testing import base_util
+from grpc_test.framework.face.testing import test_case
 
 _TIMEOUT = 3
 _MAXIMUM_POOL_SIZE = 10
diff --git a/src/python/src/grpc/framework/face/blocking_invocation_inline_service_test.py b/src/python/grpcio_test/grpc_test/framework/face/blocking_invocation_inline_service_test.py
index 763f0f0edc..8674666418 100644
--- a/src/python/src/grpc/framework/face/blocking_invocation_inline_service_test.py
+++ b/src/python/grpcio_test/grpc_test/framework/face/blocking_invocation_inline_service_test.py
@@ -31,8 +31,8 @@
 
 import unittest
 
-from grpc.framework.face import _test_case
-from grpc.framework.face.testing import blocking_invocation_inline_service_test_case as test_case
+from grpc_test.framework.face import _test_case
+from grpc_test.framework.face.testing import blocking_invocation_inline_service_test_case as test_case
 
 
 class BlockingInvocationInlineServiceTest(
diff --git a/src/python/src/grpc/framework/face/event_invocation_synchronous_event_service_test.py b/src/python/grpcio_test/grpc_test/framework/face/event_invocation_synchronous_event_service_test.py
index e1ab3cf711..dca373ef7c 100644
--- a/src/python/src/grpc/framework/face/event_invocation_synchronous_event_service_test.py
+++ b/src/python/grpcio_test/grpc_test/framework/face/event_invocation_synchronous_event_service_test.py
@@ -31,8 +31,8 @@
 
 import unittest
 
-from grpc.framework.face import _test_case
-from grpc.framework.face.testing import event_invocation_synchronous_event_service_test_case as test_case
+from grpc_test.framework.face import _test_case
+from grpc_test.framework.face.testing import event_invocation_synchronous_event_service_test_case as test_case
 
 
 class EventInvocationSynchronousEventServiceTest(
diff --git a/src/python/src/grpc/framework/face/future_invocation_asynchronous_event_service_test.py b/src/python/grpcio_test/grpc_test/framework/face/future_invocation_asynchronous_event_service_test.py
index 2d13bb911d..99fdf18123 100644
--- a/src/python/src/grpc/framework/face/future_invocation_asynchronous_event_service_test.py
+++ b/src/python/grpcio_test/grpc_test/framework/face/future_invocation_asynchronous_event_service_test.py
@@ -31,8 +31,8 @@
 
 import unittest
 
-from grpc.framework.face import _test_case
-from grpc.framework.face.testing import future_invocation_asynchronous_event_service_test_case as test_case
+from grpc_test.framework.face import _test_case
+from grpc_test.framework.face.testing import future_invocation_asynchronous_event_service_test_case as test_case
 
 
 class FutureInvocationAsynchronousEventServiceTest(
diff --git a/src/python/grpcio_test/grpc_test/framework/face/testing/__init__.py b/src/python/grpcio_test/grpc_test/framework/face/testing/__init__.py
new file mode 100644
index 0000000000..7086519106
--- /dev/null
+++ b/src/python/grpcio_test/grpc_test/framework/face/testing/__init__.py
@@ -0,0 +1,30 @@
+# Copyright 2015, Google Inc.
+# All rights reserved.
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions are
+# met:
+#
+#     * Redistributions of source code must retain the above copyright
+# notice, this list of conditions and the following disclaimer.
+#     * Redistributions in binary form must reproduce the above
+# copyright notice, this list of conditions and the following disclaimer
+# in the documentation and/or other materials provided with the
+# distribution.
+#     * Neither the name of Google Inc. nor the names of its
+# contributors may be used to endorse or promote products derived from
+# this software without specific prior written permission.
+#
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+
diff --git a/src/python/src/grpc/framework/face/testing/base_util.py b/src/python/grpcio_test/grpc_test/framework/face/testing/base_util.py
index 1df1529b27..1df1529b27 100644
--- a/src/python/src/grpc/framework/face/testing/base_util.py
+++ b/src/python/grpcio_test/grpc_test/framework/face/testing/base_util.py
diff --git a/src/python/src/grpc/framework/face/testing/blocking_invocation_inline_service_test_case.py b/src/python/grpcio_test/grpc_test/framework/face/testing/blocking_invocation_inline_service_test_case.py
index e57ee00104..7e1158f96b 100644
--- a/src/python/src/grpc/framework/face/testing/blocking_invocation_inline_service_test_case.py
+++ b/src/python/grpcio_test/grpc_test/framework/face/testing/blocking_invocation_inline_service_test_case.py
@@ -34,11 +34,11 @@ import abc
 import unittest  # pylint: disable=unused-import
 
 from grpc.framework.face import exceptions
-from grpc.framework.face.testing import control
-from grpc.framework.face.testing import coverage
-from grpc.framework.face.testing import digest
-from grpc.framework.face.testing import stock_service
-from grpc.framework.face.testing import test_case
+from grpc_test.framework.face.testing import control
+from grpc_test.framework.face.testing import coverage
+from grpc_test.framework.face.testing import digest
+from grpc_test.framework.face.testing import stock_service
+from grpc_test.framework.face.testing import test_case
 
 _TIMEOUT = 3
 _LONG_TIMEOUT = 45
diff --git a/src/python/src/grpc/framework/face/testing/callback.py b/src/python/grpcio_test/grpc_test/framework/face/testing/callback.py
index d0e63c8c56..d0e63c8c56 100644
--- a/src/python/src/grpc/framework/face/testing/callback.py
+++ b/src/python/grpcio_test/grpc_test/framework/face/testing/callback.py
diff --git a/src/python/src/grpc/framework/face/testing/control.py b/src/python/grpcio_test/grpc_test/framework/face/testing/control.py
index 3960c4e649..3960c4e649 100644
--- a/src/python/src/grpc/framework/face/testing/control.py
+++ b/src/python/grpcio_test/grpc_test/framework/face/testing/control.py
diff --git a/src/python/src/grpc/framework/face/testing/coverage.py b/src/python/grpcio_test/grpc_test/framework/face/testing/coverage.py
index f3aca113fe..f3aca113fe 100644
--- a/src/python/src/grpc/framework/face/testing/coverage.py
+++ b/src/python/grpcio_test/grpc_test/framework/face/testing/coverage.py
diff --git a/src/python/src/grpc/framework/face/testing/digest.py b/src/python/grpcio_test/grpc_test/framework/face/testing/digest.py
index db8fcbb018..54ff21779a 100644
--- a/src/python/src/grpc/framework/face/testing/digest.py
+++ b/src/python/grpcio_test/grpc_test/framework/face/testing/digest.py
@@ -38,11 +38,11 @@ from grpc.framework.common import cardinality
 from grpc.framework.common import style
 from grpc.framework.face import exceptions
 from grpc.framework.face import interfaces as face_interfaces
-from grpc.framework.face.testing import control as testing_control  # pylint: disable=unused-import
-from grpc.framework.face.testing import interfaces  # pylint: disable=unused-import
-from grpc.framework.face.testing import service as testing_service  # pylint: disable=unused-import
 from grpc.framework.foundation import stream
 from grpc.framework.foundation import stream_util
+from grpc_test.framework.face.testing import control as testing_control  # pylint: disable=unused-import
+from grpc_test.framework.face.testing import interfaces  # pylint: disable=unused-import
+from grpc_test.framework.face.testing import service as testing_service  # pylint: disable=unused-import
 
 _IDENTITY = lambda x: x
 
diff --git a/src/python/src/grpc/framework/face/testing/event_invocation_synchronous_event_service_test_case.py b/src/python/grpcio_test/grpc_test/framework/face/testing/event_invocation_synchronous_event_service_test_case.py
index 0f0b0e3d52..18eed53d6e 100644
--- a/src/python/src/grpc/framework/face/testing/event_invocation_synchronous_event_service_test_case.py
+++ b/src/python/grpcio_test/grpc_test/framework/face/testing/event_invocation_synchronous_event_service_test_case.py
@@ -33,12 +33,12 @@ import abc
 import unittest
 
 from grpc.framework.face import interfaces
-from grpc.framework.face.testing import callback as testing_callback
-from grpc.framework.face.testing import control
-from grpc.framework.face.testing import coverage
-from grpc.framework.face.testing import digest
-from grpc.framework.face.testing import stock_service
-from grpc.framework.face.testing import test_case
+from grpc_test.framework.face.testing import callback as testing_callback
+from grpc_test.framework.face.testing import control
+from grpc_test.framework.face.testing import coverage
+from grpc_test.framework.face.testing import digest
+from grpc_test.framework.face.testing import stock_service
+from grpc_test.framework.face.testing import test_case
 
 _TIMEOUT = 3
 
diff --git a/src/python/src/grpc/framework/face/testing/future_invocation_asynchronous_event_service_test_case.py b/src/python/grpcio_test/grpc_test/framework/face/testing/future_invocation_asynchronous_event_service_test_case.py
index 21bf9a4248..3b42914342 100644
--- a/src/python/src/grpc/framework/face/testing/future_invocation_asynchronous_event_service_test_case.py
+++ b/src/python/grpcio_test/grpc_test/framework/face/testing/future_invocation_asynchronous_event_service_test_case.py
@@ -35,13 +35,13 @@ import threading
 import unittest
 
 from grpc.framework.face import exceptions
-from grpc.framework.face.testing import control
-from grpc.framework.face.testing import coverage
-from grpc.framework.face.testing import digest
-from grpc.framework.face.testing import stock_service
-from grpc.framework.face.testing import test_case
 from grpc.framework.foundation import future
 from grpc.framework.foundation import logging_pool
+from grpc_test.framework.face.testing import control
+from grpc_test.framework.face.testing import coverage
+from grpc_test.framework.face.testing import digest
+from grpc_test.framework.face.testing import stock_service
+from grpc_test.framework.face.testing import test_case
 
 _TIMEOUT = 3
 _MAXIMUM_POOL_SIZE = 10
diff --git a/src/python/src/grpc/framework/face/testing/interfaces.py b/src/python/grpcio_test/grpc_test/framework/face/testing/interfaces.py
index 5932dabf1e..5932dabf1e 100644
--- a/src/python/src/grpc/framework/face/testing/interfaces.py
+++ b/src/python/grpcio_test/grpc_test/framework/face/testing/interfaces.py
diff --git a/src/python/src/grpc/framework/face/testing/serial.py b/src/python/grpcio_test/grpc_test/framework/face/testing/serial.py
index 47fc5822de..47fc5822de 100644
--- a/src/python/src/grpc/framework/face/testing/serial.py
+++ b/src/python/grpcio_test/grpc_test/framework/face/testing/serial.py
diff --git a/src/python/src/grpc/framework/face/testing/service.py b/src/python/grpcio_test/grpc_test/framework/face/testing/service.py
index bf54d41d66..ee9d6a3da3 100644
--- a/src/python/src/grpc/framework/face/testing/service.py
+++ b/src/python/grpcio_test/grpc_test/framework/face/testing/service.py
@@ -33,7 +33,7 @@ import abc
 
 # interfaces is referenced from specification in this module.
 from grpc.framework.face import interfaces as face_interfaces  # pylint: disable=unused-import
-from grpc.framework.face.testing import interfaces
+from grpc_test.framework.face.testing import interfaces
 
 
 class UnaryUnaryTestMethodImplementation(interfaces.Method):
diff --git a/src/python/src/grpc/framework/face/testing/stock_service.py b/src/python/grpcio_test/grpc_test/framework/face/testing/stock_service.py
index 61aaf444a0..0f83ca4db1 100644
--- a/src/python/src/grpc/framework/face/testing/stock_service.py
+++ b/src/python/grpcio_test/grpc_test/framework/face/testing/stock_service.py
@@ -30,11 +30,11 @@
 """Examples of Python implementations of the stock.proto Stock service."""
 
 from grpc.framework.common import cardinality
-from grpc.framework.face.testing import service
 from grpc.framework.foundation import abandonment
 from grpc.framework.foundation import stream
 from grpc.framework.foundation import stream_util
-from grpc._junkdrawer import stock_pb2
+from grpc_test.framework.face.testing import service
+from grpc_test._junkdrawer import stock_pb2
 
 SYMBOL_FORMAT = 'test symbol:%03d'
 STREAM_LENGTH = 400
diff --git a/src/python/src/grpc/framework/face/testing/test_case.py b/src/python/grpcio_test/grpc_test/framework/face/testing/test_case.py
index e60e3d1d40..858d5cf7fd 100644
--- a/src/python/src/grpc/framework/face/testing/test_case.py
+++ b/src/python/grpcio_test/grpc_test/framework/face/testing/test_case.py
@@ -33,7 +33,7 @@ import abc
 
 # face_interfaces and interfaces are referenced in specification in this module.
 from grpc.framework.face import interfaces as face_interfaces  # pylint: disable=unused-import
-from grpc.framework.face.testing import interfaces  # pylint: disable=unused-import
+from grpc_test.framework.face.testing import interfaces  # pylint: disable=unused-import
 
 
 class FaceTestCase(object):
diff --git a/src/python/grpcio_test/grpc_test/framework/foundation/__init__.py b/src/python/grpcio_test/grpc_test/framework/foundation/__init__.py
new file mode 100644
index 0000000000..7086519106
--- /dev/null
+++ b/src/python/grpcio_test/grpc_test/framework/foundation/__init__.py
@@ -0,0 +1,30 @@
+# Copyright 2015, Google Inc.
+# All rights reserved.
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions are
+# met:
+#
+#     * Redistributions of source code must retain the above copyright
+# notice, this list of conditions and the following disclaimer.
+#     * Redistributions in binary form must reproduce the above
+# copyright notice, this list of conditions and the following disclaimer
+# in the documentation and/or other materials provided with the
+# distribution.
+#     * Neither the name of Google Inc. nor the names of its
+# contributors may be used to endorse or promote products derived from
+# this software without specific prior written permission.
+#
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+
diff --git a/src/python/src/grpc/framework/foundation/_later_test.py b/src/python/grpcio_test/grpc_test/framework/foundation/_later_test.py
index 6c2459e185..6c2459e185 100644
--- a/src/python/src/grpc/framework/foundation/_later_test.py
+++ b/src/python/grpcio_test/grpc_test/framework/foundation/_later_test.py
diff --git a/src/python/src/grpc/framework/foundation/_logging_pool_test.py b/src/python/grpcio_test/grpc_test/framework/foundation/_logging_pool_test.py
index 452802da6a..452802da6a 100644
--- a/src/python/src/grpc/framework/foundation/_logging_pool_test.py
+++ b/src/python/grpcio_test/grpc_test/framework/foundation/_logging_pool_test.py
diff --git a/src/python/src/grpc/framework/foundation/stream_testing.py b/src/python/grpcio_test/grpc_test/framework/foundation/stream_testing.py
index 098a53d5e7..098a53d5e7 100644
--- a/src/python/src/grpc/framework/foundation/stream_testing.py
+++ b/src/python/grpcio_test/grpc_test/framework/foundation/stream_testing.py
diff --git a/src/python/grpcio_test/grpc_test/framework/interfaces/__init__.py b/src/python/grpcio_test/grpc_test/framework/interfaces/__init__.py
new file mode 100644
index 0000000000..7086519106
--- /dev/null
+++ b/src/python/grpcio_test/grpc_test/framework/interfaces/__init__.py
@@ -0,0 +1,30 @@
+# Copyright 2015, Google Inc.
+# All rights reserved.
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions are
+# met:
+#
+#     * Redistributions of source code must retain the above copyright
+# notice, this list of conditions and the following disclaimer.
+#     * Redistributions in binary form must reproduce the above
+# copyright notice, this list of conditions and the following disclaimer
+# in the documentation and/or other materials provided with the
+# distribution.
+#     * Neither the name of Google Inc. nor the names of its
+# contributors may be used to endorse or promote products derived from
+# this software without specific prior written permission.
+#
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+
diff --git a/src/python/grpcio_test/grpc_test/framework/interfaces/links/__init__.py b/src/python/grpcio_test/grpc_test/framework/interfaces/links/__init__.py
new file mode 100644
index 0000000000..7086519106
--- /dev/null
+++ b/src/python/grpcio_test/grpc_test/framework/interfaces/links/__init__.py
@@ -0,0 +1,30 @@
+# Copyright 2015, Google Inc.
+# All rights reserved.
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions are
+# met:
+#
+#     * Redistributions of source code must retain the above copyright
+# notice, this list of conditions and the following disclaimer.
+#     * Redistributions in binary form must reproduce the above
+# copyright notice, this list of conditions and the following disclaimer
+# in the documentation and/or other materials provided with the
+# distribution.
+#     * Neither the name of Google Inc. nor the names of its
+# contributors may be used to endorse or promote products derived from
+# this software without specific prior written permission.
+#
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+
diff --git a/src/python/src/grpc/framework/interfaces/links/test_cases.py b/src/python/grpcio_test/grpc_test/framework/interfaces/links/test_cases.py
index bf1f09d99d..26ca035c44 100644
--- a/src/python/src/grpc/framework/interfaces/links/test_cases.py
+++ b/src/python/grpcio_test/grpc_test/framework/interfaces/links/test_cases.py
@@ -33,9 +33,9 @@
 import abc
 import unittest  # pylint: disable=unused-import
 
-from grpc.framework.common import test_constants
 from grpc.framework.interfaces.links import links
-from grpc.framework.interfaces.links import test_utilities
+from grpc_test.framework.common import test_constants
+from grpc_test.framework.interfaces.links import test_utilities
 
 
 def at_least_n_payloads_received_predicate(n):
diff --git a/src/python/src/grpc/framework/interfaces/links/test_utilities.py b/src/python/grpcio_test/grpc_test/framework/interfaces/links/test_utilities.py
index 6c2e3346aa..6c2e3346aa 100644
--- a/src/python/src/grpc/framework/interfaces/links/test_utilities.py
+++ b/src/python/grpcio_test/grpc_test/framework/interfaces/links/test_utilities.py
diff --git a/src/python/grpcio_test/grpc_test/test_common.py b/src/python/grpcio_test/grpc_test/test_common.py
new file mode 100644
index 0000000000..f8e1f1e43f
--- /dev/null
+++ b/src/python/grpcio_test/grpc_test/test_common.py
@@ -0,0 +1,71 @@
+# Copyright 2015, Google Inc.
+# All rights reserved.
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions are
+# met:
+#
+#     * Redistributions of source code must retain the above copyright
+# notice, this list of conditions and the following disclaimer.
+#     * Redistributions in binary form must reproduce the above
+# copyright notice, this list of conditions and the following disclaimer
+# in the documentation and/or other materials provided with the
+# distribution.
+#     * Neither the name of Google Inc. nor the names of its
+# contributors may be used to endorse or promote products derived from
+# this software without specific prior written permission.
+#
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+"""Common code used throughout tests of gRPC."""
+
+import collections
+
+
+def metadata_transmitted(original_metadata, transmitted_metadata):
+  """Judges whether or not metadata was acceptably transmitted.
+
+  gRPC is allowed to insert key-value pairs into the metadata values given by
+  applications and to reorder key-value pairs with different keys but it is not
+  allowed to alter existing key-value pairs or to reorder key-value pairs with
+  the same key.
+
+  Args:
+    original_metadata: A metadata value used in a test of gRPC.
+    transmitted_metadata: A metadata value corresponding to original_metadata
+      after having been transmitted via gRPC.
+
+  Returns:
+     A boolean indicating whether transmitted_metadata accurately reflects
+      original_metadata after having been transmitted via gRPC.
+  """
+  original = collections.defaultdict(list)
+  for key, value in original_metadata:
+    original[key].append(value)
+  transmitted = collections.defaultdict(list)
+  for key, value in transmitted_metadata:
+    transmitted[key].append(value)
+
+  for key, values in original.iteritems():
+    transmitted_values = transmitted[key]
+    transmitted_iterator = iter(transmitted_values)
+    try:
+      for value in values:
+        while True:
+          transmitted_value = next(transmitted_iterator)
+          if value == transmitted_value:
+            break
+    except StopIteration:
+      return False
+  else:
+    return True
diff --git a/src/python/grpcio_test/requirements.txt b/src/python/grpcio_test/requirements.txt
new file mode 100644
index 0000000000..856198def5
--- /dev/null
+++ b/src/python/grpcio_test/requirements.txt
@@ -0,0 +1,5 @@
+pytest>=2.6
+pytest-cov>=2.0
+pytest-xdist>=1.11
+oauth2client>=1.4.7
+grpcio>=0.10.0a0
diff --git a/src/python/grpcio_test/setup.cfg b/src/python/grpcio_test/setup.cfg
new file mode 100644
index 0000000000..b32d3f5972
--- /dev/null
+++ b/src/python/grpcio_test/setup.cfg
@@ -0,0 +1,3 @@
+[pytest]
+norecursedirs = _cython
+python_files = *_test.py
diff --git a/src/python/grpcio_test/setup.py b/src/python/grpcio_test/setup.py
new file mode 100644
index 0000000000..925c32720f
--- /dev/null
+++ b/src/python/grpcio_test/setup.py
@@ -0,0 +1,79 @@
+# Copyright 2015, Google Inc.
+# All rights reserved.
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions are
+# met:
+#
+#     * Redistributions of source code must retain the above copyright
+# notice, this list of conditions and the following disclaimer.
+#     * Redistributions in binary form must reproduce the above
+# copyright notice, this list of conditions and the following disclaimer
+# in the documentation and/or other materials provided with the
+# distribution.
+#     * Neither the name of Google Inc. nor the names of its
+# contributors may be used to endorse or promote products derived from
+# this software without specific prior written permission.
+#
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+"""A setup module for the GRPC Python interop testing package."""
+
+import os
+import os.path
+
+import setuptools
+
+# Ensure we're in the proper directory whether or not we're being used by pip.
+os.chdir(os.path.dirname(os.path.abspath(__file__)))
+
+# Break import-style to ensure we can actually find our commands module.
+import commands
+
+_PACKAGES = setuptools.find_packages('.', exclude=['*._cython', '*._cython.*'])
+
+_PACKAGE_DIRECTORIES = {
+    '': '.',
+}
+
+_PACKAGE_DATA = {
+    'grpc_interop': [
+        'credentials/ca.pem', 'credentials/server1.key',
+        'credentials/server1.pem',]
+}
+
+_SETUP_REQUIRES = (
+    'pytest>=2.6',
+    'pytest-cov>=2.0',
+    'pytest-xdist>=1.11',
+)
+
+_INSTALL_REQUIRES = (
+    'oauth2client>=1.4.7',
+    'grpcio>=0.10.0a0',
+)
+
+_COMMAND_CLASS = {
+    'test': commands.RunTests
+}
+
+setuptools.setup(
+    name='grpcio_test',
+    version='0.10.0a0',
+    packages=_PACKAGES,
+    package_dir=_PACKAGE_DIRECTORIES,
+    package_data=_PACKAGE_DATA,
+    install_requires=_INSTALL_REQUIRES + _SETUP_REQUIRES,
+    setup_requires=_SETUP_REQUIRES,
+    cmdclass=_COMMAND_CLASS
+)
diff --git a/src/python/src/.gitignore b/src/python/src/.gitignore
deleted file mode 100644
index 144e501237..0000000000
--- a/src/python/src/.gitignore
+++ /dev/null
@@ -1,4 +0,0 @@
-MANIFEST
-grpcio.egg-info/
-build/
-dist/
diff --git a/src/python/src/MANIFEST.in b/src/python/src/MANIFEST.in
deleted file mode 100644
index 6f32db0548..0000000000
--- a/src/python/src/MANIFEST.in
+++ /dev/null
@@ -1 +0,0 @@
-graft grpc
diff --git a/src/ruby/ext/grpc/rb_call.c b/src/ruby/ext/grpc/rb_call.c
index bfb9f6ff01..a7607a83a3 100644
--- a/src/ruby/ext/grpc/rb_call.c
+++ b/src/ruby/ext/grpc/rb_call.c
@@ -235,8 +235,8 @@ static VALUE grpc_rb_call_set_metadata(VALUE self, VALUE metadata) {
 */
 static int grpc_rb_md_ary_fill_hash_cb(VALUE key, VALUE val, VALUE md_ary_obj) {
   grpc_metadata_array *md_ary = NULL;
-  int array_length;
-  int i;
+  long array_length;
+  long i;
 
   /* Construct a metadata object from key and value and add it */
   TypedData_Get_Struct(md_ary_obj, grpc_metadata_array,
diff --git a/src/ruby/ext/grpc/rb_channel.c b/src/ruby/ext/grpc/rb_channel.c
index 9bf1a9f945..a0663607c2 100644
--- a/src/ruby/ext/grpc/rb_channel.c
+++ b/src/ruby/ext/grpc/rb_channel.c
@@ -146,7 +146,7 @@ static VALUE grpc_rb_channel_init(int argc, VALUE *argv, VALUE self) {
   target_chars = StringValueCStr(target);
   grpc_rb_hash_convert_to_channel_args(channel_args, &args);
   if (credentials == Qnil) {
-    ch = grpc_channel_create(target_chars, &args);
+    ch = grpc_insecure_channel_create(target_chars, &args);
   } else {
     creds = grpc_rb_get_wrapped_credentials(credentials);
     ch = grpc_secure_channel_create(creds, target_chars, &args);
@@ -212,10 +212,10 @@ static VALUE grpc_rb_channel_create_call(VALUE self, VALUE cqueue, VALUE method,
     return Qnil;
   }
 
-  call =
-      grpc_channel_create_call(ch, cq, method_chars, host_chars,
-                               grpc_rb_time_timeval(deadline,
-                                                    /* absolute time */ 0));
+  call = grpc_channel_create_call(ch, NULL, GRPC_PROPAGATE_DEFAULTS, cq,
+                                  method_chars, host_chars,
+                                  grpc_rb_time_timeval(deadline,
+                                                       /* absolute time */ 0));
   if (call == NULL) {
     rb_raise(rb_eRuntimeError, "cannot create call with method %s",
              method_chars);
diff --git a/src/ruby/ext/grpc/rb_grpc.c b/src/ruby/ext/grpc/rb_grpc.c
index 829f825597..327fd1a4fc 100644
--- a/src/ruby/ext/grpc/rb_grpc.c
+++ b/src/ruby/ext/grpc/rb_grpc.c
@@ -139,7 +139,7 @@ gpr_timespec grpc_rb_time_timeval(VALUE time, int interval) {
           rb_raise(rb_eRangeError, "%f out of Time range",
                    RFLOAT_VALUE(time));
         }
-        t.tv_nsec = (time_t)(d * 1e9 + 0.5);
+        t.tv_nsec = (int)(d * 1e9 + 0.5);
       }
       break;
 
@@ -209,10 +209,12 @@ static ID id_to_s;
 /* Converts a wrapped time constant to a standard time. */
 static VALUE grpc_rb_time_val_to_time(VALUE self) {
   gpr_timespec *time_const = NULL;
+  gpr_timespec real_time;
   TypedData_Get_Struct(self, gpr_timespec, &grpc_rb_timespec_data_type,
                        time_const);
-  return rb_funcall(rb_cTime, id_at, 2, INT2NUM(time_const->tv_sec),
-                    INT2NUM(time_const->tv_nsec));
+  real_time = gpr_convert_clock_type(*time_const, GPR_CLOCK_REALTIME);
+  return rb_funcall(rb_cTime, id_at, 2, INT2NUM(real_time.tv_sec),
+                    INT2NUM(real_time.tv_nsec));
 }
 
 /* Invokes inspect on the ctime version of the time val. */
diff --git a/src/ruby/ext/grpc/rb_server.c b/src/ruby/ext/grpc/rb_server.c
index e3a0a5ad80..79a4ae8757 100644
--- a/src/ruby/ext/grpc/rb_server.c
+++ b/src/ruby/ext/grpc/rb_server.c
@@ -213,6 +213,7 @@ static VALUE grpc_rb_server_request_call(VALUE self, VALUE cqueue,
   grpc_call_error err;
   request_call_stack st;
   VALUE result;
+  gpr_timespec deadline;
   TypedData_Get_Struct(self, grpc_rb_server, &grpc_rb_server_data_type, s);
   if (s->wrapped == NULL) {
     rb_raise(rb_eRuntimeError, "destroyed!");
@@ -245,15 +246,13 @@ static VALUE grpc_rb_server_request_call(VALUE self, VALUE cqueue,
     }
 
     /* build the NewServerRpc struct result */
+    deadline = gpr_convert_clock_type(st.details.deadline, GPR_CLOCK_REALTIME);
     result = rb_struct_new(
-        grpc_rb_sNewServerRpc,
-        rb_str_new2(st.details.method),
+        grpc_rb_sNewServerRpc, rb_str_new2(st.details.method),
         rb_str_new2(st.details.host),
-        rb_funcall(rb_cTime, id_at, 2, INT2NUM(st.details.deadline.tv_sec),
-                   INT2NUM(st.details.deadline.tv_nsec)),
-        grpc_rb_md_ary_to_h(&st.md_ary),
-        grpc_rb_wrap_call(call),
-        NULL);
+        rb_funcall(rb_cTime, id_at, 2, INT2NUM(deadline.tv_sec),
+                   INT2NUM(deadline.tv_nsec)),
+        grpc_rb_md_ary_to_h(&st.md_ary), grpc_rb_wrap_call(call), NULL);
     grpc_request_call_stack_cleanup(&st);
     return result;
   }
@@ -358,7 +357,8 @@ static VALUE grpc_rb_server_add_http2_port(int argc, VALUE *argv, VALUE self) {
     rb_raise(rb_eRuntimeError, "destroyed!");
     return Qnil;
   } else if (rb_creds == Qnil) {
-    recvd_port = grpc_server_add_http2_port(s->wrapped, StringValueCStr(port));
+    recvd_port =
+        grpc_server_add_insecure_http2_port(s->wrapped, StringValueCStr(port));
     if (recvd_port == 0) {
       rb_raise(rb_eRuntimeError,
                "could not add port %s to server, not sure why",
diff --git a/src/ruby/ext/grpc/rb_server_credentials.c b/src/ruby/ext/grpc/rb_server_credentials.c
index 5f40935890..62c211d769 100644
--- a/src/ruby/ext/grpc/rb_server_credentials.c
+++ b/src/ruby/ext/grpc/rb_server_credentials.c
@@ -176,11 +176,12 @@ static VALUE grpc_rb_server_credentials_init(VALUE self, VALUE pem_root_certs,
   }
   key_cert_pair.private_key = RSTRING_PTR(pem_private_key);
   key_cert_pair.cert_chain = RSTRING_PTR(pem_cert_chain);
+  /* TODO Add a force_client_auth parameter and pass it here. */
   if (pem_root_certs == Qnil) {
-    creds = grpc_ssl_server_credentials_create(NULL, &key_cert_pair, 1);
+    creds = grpc_ssl_server_credentials_create(NULL, &key_cert_pair, 1, 0);
   } else {
     creds = grpc_ssl_server_credentials_create(RSTRING_PTR(pem_root_certs),
-                                               &key_cert_pair, 1);
+                                               &key_cert_pair, 1, 0);
   }
   if (creds == NULL) {
     rb_raise(rb_eRuntimeError, "could not create a credentials, not sure why");