Merge branch 'master' of https://github.com/grpc/grpc into error-arena-optimization

102 files changed, 1631 insertions, 919 deletions

diff --git a/src/compiler/cpp_generator.cc b/src/compiler/cpp_generator.cc
index e481aaf811..2908b639f3 100644
--- a/src/compiler/cpp_generator.cc
+++ b/src/compiler/cpp_generator.cc
@@ -102,7 +102,7 @@ grpc::string GetHeaderPrologue(File *file, const Parameters & /*params*/) {
     vars["filename_base"] = file->filename_without_ext();
     vars["message_header_ext"] = file->message_header_ext();
 
-    printer->Print(vars, "// Generated by the gRPC protobuf plugin.\n");
+    printer->Print(vars, "// Generated by the gRPC C++ plugin.\n");
     printer->Print(vars,
                    "// If you make any local change, they will be lost.\n");
     printer->Print(vars, "// source: $filename$\n");
@@ -1010,7 +1010,7 @@ grpc::string GetSourcePrologue(File *file, const Parameters & /*params*/) {
     vars["message_header_ext"] = file->message_header_ext();
     vars["service_header_ext"] = file->service_header_ext();
 
-    printer->Print(vars, "// Generated by the gRPC protobuf plugin.\n");
+    printer->Print(vars, "// Generated by the gRPC C++ plugin.\n");
     printer->Print(vars,
                    "// If you make any local change, they will be lost.\n");
     printer->Print(vars, "// source: $filename$\n\n");
diff --git a/src/core/ext/client_channel/client_channel_plugin.c b/src/core/ext/client_channel/client_channel_plugin.c
index 6f9df3e386..28d3b63f99 100644
--- a/src/core/ext/client_channel/client_channel_plugin.c
+++ b/src/core/ext/client_channel/client_channel_plugin.c
@@ -64,7 +64,7 @@ static bool set_default_host_if_unset(grpc_exec_ctx *exec_ctx,
     }
   }
   char *default_authority = grpc_get_default_authority(
-      grpc_channel_stack_builder_get_target(builder));
+      exec_ctx, grpc_channel_stack_builder_get_target(builder));
   if (default_authority != NULL) {
     grpc_arg arg;
     arg.type = GRPC_ARG_STRING;
diff --git a/src/core/ext/client_channel/http_proxy.c b/src/core/ext/client_channel/http_proxy.c
index bbe4ff550c..e280cef101 100644
--- a/src/core/ext/client_channel/http_proxy.c
+++ b/src/core/ext/client_channel/http_proxy.c
@@ -46,10 +46,11 @@
 #include "src/core/lib/channel/channel_args.h"
 #include "src/core/lib/support/env.h"
 
-static char* grpc_get_http_proxy_server() {
+static char* grpc_get_http_proxy_server(grpc_exec_ctx* exec_ctx) {
   char* uri_str = gpr_getenv("http_proxy");
   if (uri_str == NULL) return NULL;
-  grpc_uri* uri = grpc_uri_parse(uri_str, false /* suppress_errors */);
+  grpc_uri* uri =
+      grpc_uri_parse(exec_ctx, uri_str, false /* suppress_errors */);
   char* proxy_name = NULL;
   if (uri == NULL || uri->authority == NULL) {
     gpr_log(GPR_ERROR, "cannot parse value of 'http_proxy' env var");
@@ -76,9 +77,10 @@ static bool proxy_mapper_map_name(grpc_exec_ctx* exec_ctx,
                                   const grpc_channel_args* args,
                                   char** name_to_resolve,
                                   grpc_channel_args** new_args) {
-  *name_to_resolve = grpc_get_http_proxy_server();
+  *name_to_resolve = grpc_get_http_proxy_server(exec_ctx);
   if (*name_to_resolve == NULL) return false;
-  grpc_uri* uri = grpc_uri_parse(server_uri, false /* suppress_errors */);
+  grpc_uri* uri =
+      grpc_uri_parse(exec_ctx, server_uri, false /* suppress_errors */);
   if (uri == NULL || uri->path[0] == '\0') {
     gpr_log(GPR_ERROR,
             "'http_proxy' environment variable set, but cannot "
diff --git a/src/core/ext/client_channel/parse_address.c b/src/core/ext/client_channel/parse_address.c
index 8e4da03de0..8ae15fc72b 100644
--- a/src/core/ext/client_channel/parse_address.c
+++ b/src/core/ext/client_channel/parse_address.c
@@ -44,6 +44,7 @@
 #include <grpc/support/host_port.h>
 #include <grpc/support/log.h>
 #include <grpc/support/string_util.h>
+#include "src/core/lib/support/string.h"
 
 #ifdef GRPC_HAVE_UNIX_SOCKET
 
@@ -120,9 +121,30 @@ int parse_ipv6(grpc_uri *uri, grpc_resolved_address *resolved_addr) {
   memset(in6, 0, sizeof(*in6));
   resolved_addr->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;
+
+  /* Handle the RFC6874 syntax for IPv6 zone identifiers. */
+  char *host_end = (char *)gpr_memrchr(host, '%', strlen(host));
+  if (host_end != NULL) {
+    GPR_ASSERT(host_end >= host);
+    char host_without_scope[INET6_ADDRSTRLEN];
+    size_t host_without_scope_len = (size_t)(host_end - host);
+    strncpy(host_without_scope, host, host_without_scope_len);
+    host_without_scope[host_without_scope_len] = '\0';
+    if (inet_pton(AF_INET6, host_without_scope, &in6->sin6_addr) == 0) {
+      gpr_log(GPR_ERROR, "invalid ipv6 address: '%s'", host_without_scope);
+      goto done;
+    }
+    if (gpr_parse_bytes_to_uint32(host_end + 1,
+                                  strlen(host) - host_without_scope_len - 1,
+                                  &in6->sin6_scope_id) == 0) {
+      gpr_log(GPR_ERROR, "invalid ipv6 scope id: '%s'", host_end + 1);
+      goto done;
+    }
+  } else {
+    if (inet_pton(AF_INET6, host, &in6->sin6_addr) == 0) {
+      gpr_log(GPR_ERROR, "invalid ipv6 address: '%s'", host);
+      goto done;
+    }
   }
 
   if (port != NULL) {
diff --git a/src/core/ext/client_channel/resolver_registry.c b/src/core/ext/client_channel/resolver_registry.c
index f8e8bc9c39..3c5a6fb3ff 100644
--- a/src/core/ext/client_channel/resolver_registry.c
+++ b/src/core/ext/client_channel/resolver_registry.c
@@ -108,22 +108,23 @@ static grpc_resolver_factory *lookup_factory_by_uri(grpc_uri *uri) {
   return lookup_factory(uri->scheme);
 }
 
-static grpc_resolver_factory *resolve_factory(const char *target,
+static grpc_resolver_factory *resolve_factory(grpc_exec_ctx *exec_ctx,
+                                              const char *target,
                                               grpc_uri **uri,
                                               char **canonical_target) {
   grpc_resolver_factory *factory = NULL;
 
   GPR_ASSERT(uri != NULL);
-  *uri = grpc_uri_parse(target, 1);
+  *uri = grpc_uri_parse(exec_ctx, target, 1);
   factory = lookup_factory_by_uri(*uri);
   if (factory == NULL) {
     grpc_uri_destroy(*uri);
     gpr_asprintf(canonical_target, "%s%s", g_default_resolver_prefix, target);
-    *uri = grpc_uri_parse(*canonical_target, 1);
+    *uri = grpc_uri_parse(exec_ctx, *canonical_target, 1);
     factory = lookup_factory_by_uri(*uri);
     if (factory == NULL) {
-      grpc_uri_destroy(grpc_uri_parse(target, 0));
-      grpc_uri_destroy(grpc_uri_parse(*canonical_target, 0));
+      grpc_uri_destroy(grpc_uri_parse(exec_ctx, target, 0));
+      grpc_uri_destroy(grpc_uri_parse(exec_ctx, *canonical_target, 0));
       gpr_log(GPR_ERROR, "don't know how to resolve '%s' or '%s'", target,
               *canonical_target);
     }
@@ -138,7 +139,7 @@ grpc_resolver *grpc_resolver_create(grpc_exec_ctx *exec_ctx, const char *target,
   grpc_uri *uri = NULL;
   char *canonical_target = NULL;
   grpc_resolver_factory *factory =
-      resolve_factory(target, &uri, &canonical_target);
+      resolve_factory(exec_ctx, target, &uri, &canonical_target);
   grpc_resolver *resolver;
   grpc_resolver_args resolver_args;
   memset(&resolver_args, 0, sizeof(resolver_args));
@@ -153,21 +154,22 @@ grpc_resolver *grpc_resolver_create(grpc_exec_ctx *exec_ctx, const char *target,
   return resolver;
 }
 
-char *grpc_get_default_authority(const char *target) {
+char *grpc_get_default_authority(grpc_exec_ctx *exec_ctx, const char *target) {
   grpc_uri *uri = NULL;
   char *canonical_target = NULL;
   grpc_resolver_factory *factory =
-      resolve_factory(target, &uri, &canonical_target);
+      resolve_factory(exec_ctx, target, &uri, &canonical_target);
   char *authority = grpc_resolver_factory_get_default_authority(factory, uri);
   grpc_uri_destroy(uri);
   gpr_free(canonical_target);
   return authority;
 }
 
-char *grpc_resolver_factory_add_default_prefix_if_needed(const char *target) {
+char *grpc_resolver_factory_add_default_prefix_if_needed(
+    grpc_exec_ctx *exec_ctx, const char *target) {
   grpc_uri *uri = NULL;
   char *canonical_target = NULL;
-  resolve_factory(target, &uri, &canonical_target);
+  resolve_factory(exec_ctx, target, &uri, &canonical_target);
   grpc_uri_destroy(uri);
   return canonical_target == NULL ? gpr_strdup(target) : canonical_target;
 }
diff --git a/src/core/ext/client_channel/resolver_registry.h b/src/core/ext/client_channel/resolver_registry.h
index e2c189cf0c..1a3ebee25a 100644
--- a/src/core/ext/client_channel/resolver_registry.h
+++ b/src/core/ext/client_channel/resolver_registry.h
@@ -74,10 +74,11 @@ grpc_resolver_factory *grpc_resolver_factory_lookup(const char *name);
 
 /** Given a target, return a (freshly allocated with gpr_malloc) string
     representing the default authority to pass from a client. */
-char *grpc_get_default_authority(const char *target);
+char *grpc_get_default_authority(grpc_exec_ctx *exec_ctx, const char *target);
 
 /** Returns a newly allocated string containing \a target, adding the
     default prefix if needed. */
-char *grpc_resolver_factory_add_default_prefix_if_needed(const char *target);
+char *grpc_resolver_factory_add_default_prefix_if_needed(
+    grpc_exec_ctx *exec_ctx, const char *target);
 
 #endif /* GRPC_CORE_EXT_CLIENT_CHANNEL_RESOLVER_REGISTRY_H */
diff --git a/src/core/ext/client_channel/subchannel.c b/src/core/ext/client_channel/subchannel.c
index cb2d2c821d..5df0a9060d 100644
--- a/src/core/ext/client_channel/subchannel.c
+++ b/src/core/ext/client_channel/subchannel.c
@@ -331,7 +331,7 @@ grpc_subchannel *grpc_subchannel_create(grpc_exec_ctx *exec_ctx,
   }
   c->pollset_set = grpc_pollset_set_create();
   grpc_resolved_address *addr = gpr_malloc(sizeof(*addr));
-  grpc_get_subchannel_address_arg(args->args, addr);
+  grpc_get_subchannel_address_arg(exec_ctx, args->args, addr);
   grpc_set_initial_connect_string(&addr, &c->initial_connect_string);
   grpc_resolved_address *new_address = NULL;
   grpc_channel_args *new_args = NULL;
@@ -787,9 +787,9 @@ grpc_call_stack *grpc_subchannel_call_get_call_stack(
   return SUBCHANNEL_CALL_TO_CALL_STACK(subchannel_call);
 }
 
-static void grpc_uri_to_sockaddr(const char *uri_str,
+static void grpc_uri_to_sockaddr(grpc_exec_ctx *exec_ctx, const char *uri_str,
                                  grpc_resolved_address *addr) {
-  grpc_uri *uri = grpc_uri_parse(uri_str, 0 /* suppress_errors */);
+  grpc_uri *uri = grpc_uri_parse(exec_ctx, uri_str, 0 /* suppress_errors */);
   GPR_ASSERT(uri != NULL);
   if (strcmp(uri->scheme, "ipv4") == 0) {
     GPR_ASSERT(parse_ipv4(uri, addr));
@@ -801,12 +801,13 @@ static void grpc_uri_to_sockaddr(const char *uri_str,
   grpc_uri_destroy(uri);
 }
 
-void grpc_get_subchannel_address_arg(const grpc_channel_args *args,
+void grpc_get_subchannel_address_arg(grpc_exec_ctx *exec_ctx,
+                                     const grpc_channel_args *args,
                                      grpc_resolved_address *addr) {
   const char *addr_uri_str = grpc_get_subchannel_address_uri_arg(args);
   memset(addr, 0, sizeof(*addr));
   if (*addr_uri_str != '\0') {
-    grpc_uri_to_sockaddr(addr_uri_str, addr);
+    grpc_uri_to_sockaddr(exec_ctx, addr_uri_str, addr);
   }
 }
 
diff --git a/src/core/ext/client_channel/subchannel.h b/src/core/ext/client_channel/subchannel.h
index 26ce954487..6a70a76467 100644
--- a/src/core/ext/client_channel/subchannel.h
+++ b/src/core/ext/client_channel/subchannel.h
@@ -175,7 +175,8 @@ grpc_subchannel *grpc_subchannel_create(grpc_exec_ctx *exec_ctx,
                                         const grpc_subchannel_args *args);
 
 /// Sets \a addr from \a args.
-void grpc_get_subchannel_address_arg(const grpc_channel_args *args,
+void grpc_get_subchannel_address_arg(grpc_exec_ctx *exec_ctx,
+                                     const grpc_channel_args *args,
                                      grpc_resolved_address *addr);
 
 /// Returns the URI string for the address to connect to.
diff --git a/src/core/ext/client_channel/uri_parser.c b/src/core/ext/client_channel/uri_parser.c
index 7dd7b753cc..d385db0801 100644
--- a/src/core/ext/client_channel/uri_parser.c
+++ b/src/core/ext/client_channel/uri_parser.c
@@ -35,13 +35,15 @@
 
 #include <string.h>
 
-#include <grpc/slice.h>
 #include <grpc/slice_buffer.h>
 #include <grpc/support/alloc.h>
 #include <grpc/support/log.h>
 #include <grpc/support/port_platform.h>
 #include <grpc/support/string_util.h>
 
+#include "src/core/lib/slice/percent_encoding.h"
+#include "src/core/lib/slice/slice_internal.h"
+#include "src/core/lib/slice/slice_string_helpers.h"
 #include "src/core/lib/support/string.h"
 
 /** a size_t default value... maps to all 1's */
@@ -68,11 +70,16 @@ static grpc_uri *bad_uri(const char *uri_text, size_t pos, const char *section,
   return NULL;
 }
 
-/** Returns a copy of \a src[begin, end) */
-static char *copy_component(const char *src, size_t begin, size_t end) {
-  char *out = gpr_malloc(end - begin + 1);
-  memcpy(out, src + begin, end - begin);
-  out[end - begin] = 0;
+/** Returns a copy of percent decoded \a src[begin, end) */
+static char *decode_and_copy_component(grpc_exec_ctx *exec_ctx, const char *src,
+                                       size_t begin, size_t end) {
+  grpc_slice component =
+      grpc_slice_from_copied_buffer(src + begin, end - begin);
+  grpc_slice decoded_component =
+      grpc_permissive_percent_decode_slice(component);
+  char *out = grpc_dump_slice(decoded_component, GPR_DUMP_ASCII);
+  grpc_slice_unref_internal(exec_ctx, component);
+  grpc_slice_unref_internal(exec_ctx, decoded_component);
   return out;
 }
 
@@ -175,7 +182,8 @@ static void parse_query_parts(grpc_uri *uri) {
   }
 }
 
-grpc_uri *grpc_uri_parse(const char *uri_text, int suppress_errors) {
+grpc_uri *grpc_uri_parse(grpc_exec_ctx *exec_ctx, const char *uri_text,
+                         int suppress_errors) {
   grpc_uri *uri;
   size_t scheme_begin = 0;
   size_t scheme_end = NOT_SET;
@@ -263,11 +271,16 @@ grpc_uri *grpc_uri_parse(const char *uri_text, int suppress_errors) {
   }
 
   uri = gpr_zalloc(sizeof(*uri));
-  uri->scheme = copy_component(uri_text, scheme_begin, scheme_end);
-  uri->authority = copy_component(uri_text, authority_begin, authority_end);
-  uri->path = copy_component(uri_text, path_begin, path_end);
-  uri->query = copy_component(uri_text, query_begin, query_end);
-  uri->fragment = copy_component(uri_text, fragment_begin, fragment_end);
+  uri->scheme =
+      decode_and_copy_component(exec_ctx, uri_text, scheme_begin, scheme_end);
+  uri->authority = decode_and_copy_component(exec_ctx, uri_text,
+                                             authority_begin, authority_end);
+  uri->path =
+      decode_and_copy_component(exec_ctx, uri_text, path_begin, path_end);
+  uri->query =
+      decode_and_copy_component(exec_ctx, uri_text, query_begin, query_end);
+  uri->fragment = decode_and_copy_component(exec_ctx, uri_text, fragment_begin,
+                                            fragment_end);
   parse_query_parts(uri);
 
   return uri;
diff --git a/src/core/ext/client_channel/uri_parser.h b/src/core/ext/client_channel/uri_parser.h
index 5fe0e8f35e..efd4302c1c 100644
--- a/src/core/ext/client_channel/uri_parser.h
+++ b/src/core/ext/client_channel/uri_parser.h
@@ -35,6 +35,7 @@
 #define GRPC_CORE_EXT_CLIENT_CHANNEL_URI_PARSER_H
 
 #include <stddef.h>
+#include "src/core/lib/iomgr/exec_ctx.h"
 
 typedef struct {
   char *scheme;
@@ -51,7 +52,8 @@ typedef struct {
 } grpc_uri;
 
 /** parse a uri, return NULL on failure */
-grpc_uri *grpc_uri_parse(const char *uri_text, int suppress_errors);
+grpc_uri *grpc_uri_parse(grpc_exec_ctx *exec_ctx, const char *uri_text,
+                         int suppress_errors);
 
 /** return the part of a query string after the '=' in "?key=xxx&...", or NULL
  * if key is not present */
diff --git a/src/core/ext/lb_policy/grpclb/grpclb.c b/src/core/ext/lb_policy/grpclb/grpclb.c
index aea0fcc33d..d612591f2e 100644
--- a/src/core/ext/lb_policy/grpclb/grpclb.c
+++ b/src/core/ext/lb_policy/grpclb/grpclb.c
@@ -861,7 +861,7 @@ static grpc_lb_policy *glb_create(grpc_exec_ctx *exec_ctx,
   arg = grpc_channel_args_find(args->args, GRPC_ARG_SERVER_URI);
   GPR_ASSERT(arg != NULL);
   GPR_ASSERT(arg->type == GRPC_ARG_STRING);
-  grpc_uri *uri = grpc_uri_parse(arg->value.string, true);
+  grpc_uri *uri = grpc_uri_parse(exec_ctx, arg->value.string, true);
   GPR_ASSERT(uri->path[0] != '\0');
   glb_policy->server_name =
       gpr_strdup(uri->path[0] == '/' ? uri->path + 1 : uri->path);
diff --git a/src/core/ext/transport/chttp2/client/chttp2_connector.c b/src/core/ext/transport/chttp2/client/chttp2_connector.c
index fc5e17d8fc..eae0145ecc 100644
--- a/src/core/ext/transport/chttp2/client/chttp2_connector.c
+++ b/src/core/ext/transport/chttp2/client/chttp2_connector.c
@@ -226,7 +226,7 @@ static void chttp2_connector_connect(grpc_exec_ctx *exec_ctx,
                                      grpc_closure *notify) {
   chttp2_connector *c = (chttp2_connector *)con;
   grpc_resolved_address addr;
-  grpc_get_subchannel_address_arg(args->channel_args, &addr);
+  grpc_get_subchannel_address_arg(exec_ctx, args->channel_args, &addr);
   gpr_mu_lock(&c->mu);
   GPR_ASSERT(c->notify == NULL);
   c->notify = notify;
diff --git a/src/core/ext/transport/chttp2/client/insecure/channel_create.c b/src/core/ext/transport/chttp2/client/insecure/channel_create.c
index 286232f277..067ac35a5a 100644
--- a/src/core/ext/transport/chttp2/client/insecure/channel_create.c
+++ b/src/core/ext/transport/chttp2/client/insecure/channel_create.c
@@ -72,7 +72,8 @@ static grpc_channel *client_channel_factory_create_channel(
   grpc_arg arg;
   arg.type = GRPC_ARG_STRING;
   arg.key = GRPC_ARG_SERVER_URI;
-  arg.value.string = grpc_resolver_factory_add_default_prefix_if_needed(target);
+  arg.value.string =
+      grpc_resolver_factory_add_default_prefix_if_needed(exec_ctx, target);
   const char *to_remove[] = {GRPC_ARG_SERVER_URI};
   grpc_channel_args *new_args =
       grpc_channel_args_copy_and_add_and_remove(args, to_remove, 1, &arg, 1);
diff --git a/src/core/ext/transport/chttp2/client/secure/secure_channel_create.c b/src/core/ext/transport/chttp2/client/secure/secure_channel_create.c
index 825db68c65..f0c241d68e 100644
--- a/src/core/ext/transport/chttp2/client/secure/secure_channel_create.c
+++ b/src/core/ext/transport/chttp2/client/secure/secure_channel_create.c
@@ -83,7 +83,7 @@ static grpc_subchannel_args *get_secure_naming_subchannel_args(
   const char *server_uri_str = server_uri_arg->value.string;
   GPR_ASSERT(server_uri_str != NULL);
   grpc_uri *server_uri =
-      grpc_uri_parse(server_uri_str, true /* supress errors */);
+      grpc_uri_parse(exec_ctx, server_uri_str, true /* supress errors */);
   GPR_ASSERT(server_uri != NULL);
   const char *server_uri_path;
   server_uri_path =
@@ -96,7 +96,7 @@ static grpc_subchannel_args *get_secure_naming_subchannel_args(
     const char *target_uri_str =
         grpc_get_subchannel_address_uri_arg(args->args);
     grpc_uri *target_uri =
-        grpc_uri_parse(target_uri_str, false /* suppress errors */);
+        grpc_uri_parse(exec_ctx, target_uri_str, false /* suppress errors */);
     GPR_ASSERT(target_uri != NULL);
     if (target_uri->path[0] != '\0') {  // "path" may be empty
       const grpc_slice key = grpc_slice_from_static_string(
@@ -181,7 +181,8 @@ static grpc_channel *client_channel_factory_create_channel(
   grpc_arg arg;
   arg.type = GRPC_ARG_STRING;
   arg.key = GRPC_ARG_SERVER_URI;
-  arg.value.string = grpc_resolver_factory_add_default_prefix_if_needed(target);
+  arg.value.string =
+      grpc_resolver_factory_add_default_prefix_if_needed(exec_ctx, target);
   const char *to_remove[] = {GRPC_ARG_SERVER_URI};
   grpc_channel_args *new_args =
       grpc_channel_args_copy_and_add_and_remove(args, to_remove, 1, &arg, 1);
diff --git a/src/core/lib/http/parser.c b/src/core/lib/http/parser.c
index 2f84adc187..b9c56c103c 100644
--- a/src/core/lib/http/parser.c
+++ b/src/core/lib/http/parser.c
@@ -284,9 +284,9 @@ static grpc_error *addbyte(grpc_http_parser *parser, uint8_t byte,
     case GRPC_HTTP_HEADERS:
       if (parser->cur_line_length >= GRPC_HTTP_PARSER_MAX_HEADER_LENGTH) {
         if (grpc_http1_trace)
-          gpr_log(GPR_ERROR, "HTTP client max line length (%d) exceeded",
+          gpr_log(GPR_ERROR, "HTTP header max line length (%d) exceeded",
                   GRPC_HTTP_PARSER_MAX_HEADER_LENGTH);
-        return GRPC_ERROR_NONE;
+        return GRPC_ERROR_CREATE("HTTP header max line length exceeded");
       }
       parser->cur_line[parser->cur_line_length] = byte;
       parser->cur_line_length++;
diff --git a/src/core/lib/iomgr/sockaddr_utils.c b/src/core/lib/iomgr/sockaddr_utils.c
index ffa62cb53c..9d2732666b 100644
--- a/src/core/lib/iomgr/sockaddr_utils.c
+++ b/src/core/lib/iomgr/sockaddr_utils.c
@@ -162,6 +162,7 @@ int grpc_sockaddr_to_string(char **out,
   char ntop_buf[INET6_ADDRSTRLEN];
   const void *ip = NULL;
   int port;
+  uint32_t sin6_scope_id = 0;
   int ret;
 
   *out = NULL;
@@ -177,10 +178,19 @@ int grpc_sockaddr_to_string(char **out,
     const struct sockaddr_in6 *addr6 = (const struct sockaddr_in6 *)addr;
     ip = &addr6->sin6_addr;
     port = ntohs(addr6->sin6_port);
+    sin6_scope_id = addr6->sin6_scope_id;
   }
   if (ip != NULL &&
       grpc_inet_ntop(addr->sa_family, ip, ntop_buf, sizeof(ntop_buf)) != NULL) {
-    ret = gpr_join_host_port(out, ntop_buf, port);
+    if (sin6_scope_id != 0) {
+      char *host_with_scope;
+      /* Enclose sin6_scope_id with the format defined in RFC 6784 section 2. */
+      gpr_asprintf(&host_with_scope, "%s%%25%" PRIu32, ntop_buf, sin6_scope_id);
+      ret = gpr_join_host_port(out, host_with_scope, port);
+      gpr_free(host_with_scope);
+    } else {
+      ret = gpr_join_host_port(out, ntop_buf, port);
+    }
   } else {
     ret = gpr_asprintf(out, "(sockaddr family=%d)", addr->sa_family);
   }
diff --git a/src/core/lib/iomgr/tcp_server_posix.c b/src/core/lib/iomgr/tcp_server_posix.c
index 36f878fdd4..5f286a6723 100644
--- a/src/core/lib/iomgr/tcp_server_posix.c
+++ b/src/core/lib/iomgr/tcp_server_posix.c
@@ -114,6 +114,8 @@ struct grpc_tcp_server {
 
   /* is this server shutting down? */
   bool shutdown;
+  /* have listeners been shutdown? */
+  bool shutdown_listeners;
   /* use SO_REUSEPORT */
   bool so_reuseport;
   /* expand wildcard addresses to a list of all local addresses */
@@ -161,7 +163,7 @@ grpc_error *grpc_tcp_server_create(grpc_exec_ctx *exec_ctx,
                                    grpc_tcp_server **server) {
   gpr_once_init(&check_init, init);
 
-  grpc_tcp_server *s = gpr_malloc(sizeof(grpc_tcp_server));
+  grpc_tcp_server *s = gpr_zalloc(sizeof(grpc_tcp_server));
   s->so_reuseport = has_so_reuseport;
   s->resource_quota = grpc_resource_quota_create(NULL);
   s->expand_wildcard_addrs = false;
@@ -422,7 +424,14 @@ static void on_read(grpc_exec_ctx *exec_ctx, void *arg, grpc_error *err) {
           grpc_fd_notify_on_read(exec_ctx, sp->emfd, &sp->read_closure);
           return;
         default:
-          gpr_log(GPR_ERROR, "Failed accept4: %s", strerror(errno));
+          gpr_mu_lock(&sp->server->mu);
+          if (!sp->server->shutdown_listeners) {
+            gpr_log(GPR_ERROR, "Failed accept4: %s", strerror(errno));
+          } else {
+            /* if we have shutdown listeners, accept4 could fail, and we
+               needn't notify users */
+          }
+          gpr_mu_unlock(&sp->server->mu);
           goto error;
       }
     }
@@ -438,11 +447,6 @@ static void on_read(grpc_exec_ctx *exec_ctx, void *arg, grpc_error *err) {
 
     grpc_fd *fdobj = grpc_fd_create(fd, name);
 
-    if (read_notifier_pollset == NULL) {
-      gpr_log(GPR_ERROR, "Read notifier pollset is not set on the fd");
-      goto error;
-    }
-
     grpc_pollset_add_fd(exec_ctx, read_notifier_pollset, fdobj);
 
     // Create acceptor.
@@ -941,6 +945,7 @@ void grpc_tcp_server_unref(grpc_exec_ctx *exec_ctx, grpc_tcp_server *s) {
 void grpc_tcp_server_shutdown_listeners(grpc_exec_ctx *exec_ctx,
                                         grpc_tcp_server *s) {
   gpr_mu_lock(&s->mu);
+  s->shutdown_listeners = true;
   /* shutdown all fd's */
   if (s->active_ports) {
     grpc_tcp_listener *sp;
diff --git a/src/core/lib/iomgr/udp_server.c b/src/core/lib/iomgr/udp_server.c
index 2a1c8d39fa..d1bcd89af1 100644
--- a/src/core/lib/iomgr/udp_server.c
+++ b/src/core/lib/iomgr/udp_server.c
@@ -485,7 +485,11 @@ void grpc_udp_server_start(grpc_exec_ctx *exec_ctx, grpc_udp_server *s,
                       grpc_schedule_on_exec_ctx);
     grpc_fd_notify_on_write(exec_ctx, sp->emfd, &sp->write_closure);
 
-    s->active_ports++;
+    /* Registered for both read and write callbacks: increment active_ports
+     * twice to account for this, and delay free-ing of memory until both
+     * on_read and on_write have fired. */
+    s->active_ports += 2;
+
     sp = sp->next;
   }
 
diff --git a/src/core/lib/support/sync.c b/src/core/lib/support/sync.c
index 9b5a4ac708..b52f004f74 100644
--- a/src/core/lib/support/sync.c
+++ b/src/core/lib/support/sync.c
@@ -37,6 +37,8 @@
 #include <grpc/support/log.h>
 #include <grpc/support/sync.h>
 
+#include <assert.h>
+
 /* Number of mutexes to allocate for events, to avoid lock contention.
    Should be a prime. */
 enum { event_sync_partitions = 31 };
@@ -99,8 +101,12 @@ void gpr_ref_init(gpr_refcount *r, int n) { gpr_atm_rel_store(&r->count, n); }
 void gpr_ref(gpr_refcount *r) { gpr_atm_no_barrier_fetch_add(&r->count, 1); }
 
 void gpr_ref_non_zero(gpr_refcount *r) {
+#ifndef NDEBUG
   gpr_atm prior = gpr_atm_no_barrier_fetch_add(&r->count, 1);
-  GPR_ASSERT(prior > 0);
+  assert(prior > 0);
+#else
+  gpr_ref(r);
+#endif
 }
 
 void gpr_refn(gpr_refcount *r, int n) {
diff --git a/src/core/lib/surface/call.c b/src/core/lib/surface/call.c
index cc57654ea4..c2547c5147 100644
--- a/src/core/lib/surface/call.c
+++ b/src/core/lib/surface/call.c
@@ -161,6 +161,7 @@ struct grpc_call {
   bool receiving_message;
   bool requested_final_op;
   bool received_final_op;
+  bool sent_any_op;
 
   /* have we received initial metadata */
   bool has_initial_md_been_received;
@@ -488,7 +489,7 @@ void grpc_call_destroy(grpc_call *c) {
   gpr_mu_lock(&c->mu);
   GPR_ASSERT(!c->destroy_called);
   c->destroy_called = 1;
-  cancel = !c->received_final_op;
+  cancel = c->sent_any_op && !c->received_final_op;
   gpr_mu_unlock(&c->mu);
   if (cancel) {
     cancel_with_error(&exec_ctx, c, STATUS_FROM_API_OVERRIDE,
@@ -1678,6 +1679,7 @@ static grpc_call_error call_start_batch(grpc_exec_ctx *exec_ctx,
   grpc_closure_init(&bctl->finish_batch, finish_batch, bctl,
                     grpc_schedule_on_exec_ctx);
   stream_op->on_complete = &bctl->finish_batch;
+  call->sent_any_op = true;
   gpr_mu_unlock(&call->mu);
 
   execute_op(exec_ctx, call, stream_op);
diff --git a/src/core/lib/transport/transport.c b/src/core/lib/transport/transport.c
index 004e748f25..165950e288 100644
--- a/src/core/lib/transport/transport.c
+++ b/src/core/lib/transport/transport.c
@@ -84,6 +84,39 @@ void grpc_stream_unref(grpc_exec_ctx *exec_ctx,
   }
 }
 
+#define STREAM_REF_FROM_SLICE_REF(p)         \
+  ((grpc_stream_refcount *)(((uint8_t *)p) - \
+                            offsetof(grpc_stream_refcount, slice_refcount)))
+
+static void slice_stream_ref(void *p) {
+#ifdef GRPC_STREAM_REFCOUNT_DEBUG
+  grpc_stream_ref(STREAM_REF_FROM_SLICE_REF(p), "slice");
+#else
+  grpc_stream_ref(STREAM_REF_FROM_SLICE_REF(p));
+#endif
+}
+
+static void slice_stream_unref(grpc_exec_ctx *exec_ctx, void *p) {
+#ifdef GRPC_STREAM_REFCOUNT_DEBUG
+  grpc_stream_unref(exec_ctx, STREAM_REF_FROM_SLICE_REF(p), "slice");
+#else
+  grpc_stream_unref(exec_ctx, STREAM_REF_FROM_SLICE_REF(p));
+#endif
+}
+
+grpc_slice grpc_slice_from_stream_owned_buffer(grpc_stream_refcount *refcount,
+                                               void *buffer, size_t length) {
+  slice_stream_ref(&refcount->slice_refcount);
+  return (grpc_slice){.refcount = &refcount->slice_refcount,
+                      .data.refcounted = {.bytes = buffer, .length = length}};
+}
+
+static const grpc_slice_refcount_vtable stream_ref_slice_vtable = {
+    .ref = slice_stream_ref,
+    .unref = slice_stream_unref,
+    .eq = grpc_slice_default_eq_impl,
+    .hash = grpc_slice_default_hash_impl};
+
 #ifdef GRPC_STREAM_REFCOUNT_DEBUG
 void grpc_stream_ref_init(grpc_stream_refcount *refcount, int initial_refs,
                           grpc_iomgr_cb_func cb, void *cb_arg,
@@ -95,6 +128,8 @@ void grpc_stream_ref_init(grpc_stream_refcount *refcount, int initial_refs,
 #endif
   gpr_ref_init(&refcount->refs, initial_refs);
   grpc_closure_init(&refcount->destroy, cb, cb_arg, grpc_schedule_on_exec_ctx);
+  refcount->slice_refcount.vtable = &stream_ref_slice_vtable;
+  refcount->slice_refcount.sub_refcount = &refcount->slice_refcount;
 }
 
 static void move64(uint64_t *from, uint64_t *to) {
diff --git a/src/core/lib/transport/transport.h b/src/core/lib/transport/transport.h
index bb23c0225a..cc1c277b35 100644
--- a/src/core/lib/transport/transport.h
+++ b/src/core/lib/transport/transport.h
@@ -64,6 +64,7 @@ typedef struct grpc_stream_refcount {
 #ifdef GRPC_STREAM_REFCOUNT_DEBUG
   const char *object_type;
 #endif
+  grpc_slice_refcount slice_refcount;
 } grpc_stream_refcount;
 
 #ifdef GRPC_STREAM_REFCOUNT_DEBUG
@@ -84,6 +85,11 @@ void grpc_stream_unref(grpc_exec_ctx *exec_ctx, grpc_stream_refcount *refcount);
   grpc_stream_ref_init(rc, ir, cb, cb_arg)
 #endif
 
+/* Wrap a buffer that is owned by some stream object into a slice that shares
+   the same refcount */
+grpc_slice grpc_slice_from_stream_owned_buffer(grpc_stream_refcount *refcount,
+                                               void *buffer, size_t length);
+
 typedef struct {
   uint64_t framing_bytes;
   uint64_t data_bytes;
diff --git a/src/core/lib/tsi/test_creds/BUILD b/src/core/lib/tsi/test_creds/BUILD
index dcd6d930a8..5cf04caf17 100644
--- a/src/core/lib/tsi/test_creds/BUILD
+++ b/src/core/lib/tsi/test_creds/BUILD
@@ -27,6 +27,8 @@
 # (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 # OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
+licenses(["notice"])  # 3-clause BSD
+
 exports_files([
     "ca.pem",
     "server1.key",
diff --git a/src/cpp/server/health/default_health_check_service.cc b/src/cpp/server/health/default_health_check_service.cc
index 46def70e8a..bc98ce79a7 100644
--- a/src/cpp/server/health/default_health_check_service.cc
+++ b/src/cpp/server/health/default_health_check_service.cc
@@ -63,7 +63,9 @@ Status DefaultHealthCheckService::HealthCheckServiceImpl::Check(
     ServerContext* context, const ByteBuffer* request, ByteBuffer* response) {
   // Decode request.
   std::vector<Slice> slices;
-  request->Dump(&slices);
+  if (!request->Dump(&slices).ok()) {
+    return Status(StatusCode::INVALID_ARGUMENT, "");
+  }
   uint8_t* request_bytes = nullptr;
   bool request_bytes_owned = false;
   size_t request_size = 0;
diff --git a/src/csharp/Grpc.Auth/Grpc.Auth.csproj b/src/csharp/Grpc.Auth/Grpc.Auth.csproj
index db55ed5a6c..9ef98529e8 100644
--- a/src/csharp/Grpc.Auth/Grpc.Auth.csproj
+++ b/src/csharp/Grpc.Auth/Grpc.Auth.csproj
@@ -34,32 +34,26 @@
     <Reference Include="System.Net" />
     <Reference Include="System.Net.Http" />
     <Reference Include="System.Net.Http.WebRequest" />
-    <Reference Include="BouncyCastle.Crypto">
-      <HintPath>..\packages\BouncyCastle.1.7.0\lib\Net40-Client\BouncyCastle.Crypto.dll</HintPath>
-    </Reference>
-    <Reference Include="Newtonsoft.Json">
-      <HintPath>..\packages\Newtonsoft.Json.7.0.1\lib\net45\Newtonsoft.Json.dll</HintPath>
-    </Reference>
-    <Reference Include="log4net">
-      <HintPath>..\packages\log4net.2.0.3\lib\net40-full\log4net.dll</HintPath>
-    </Reference>
-    <Reference Include="Google.Apis.Core">
-      <HintPath>..\packages\Google.Apis.Core.1.16.0\lib\net45\Google.Apis.Core.dll</HintPath>
-    </Reference>
     <Reference Include="Zlib.Portable">
       <HintPath>..\packages\Zlib.Portable.Signed.1.11.0\lib\portable-net4+sl5+wp8+win8+wpa81+MonoTouch+MonoAndroid\Zlib.Portable.dll</HintPath>
     </Reference>
+    <Reference Include="Google.Apis.Core">
+      <HintPath>..\packages\Google.Apis.Core.1.21.0\lib\net45\Google.Apis.Core.dll</HintPath>
+    </Reference>
     <Reference Include="Google.Apis">
-      <HintPath>..\packages\Google.Apis.1.16.0\lib\net45\Google.Apis.dll</HintPath>
+      <HintPath>..\packages\Google.Apis.1.21.0\lib\net45\Google.Apis.dll</HintPath>
     </Reference>
     <Reference Include="Google.Apis.PlatformServices">
-      <HintPath>..\packages\Google.Apis.1.16.0\lib\net45\Google.Apis.PlatformServices.dll</HintPath>
+      <HintPath>..\packages\Google.Apis.1.21.0\lib\net45\Google.Apis.PlatformServices.dll</HintPath>
     </Reference>
     <Reference Include="Google.Apis.Auth">
-      <HintPath>..\packages\Google.Apis.Auth.1.16.0\lib\net45\Google.Apis.Auth.dll</HintPath>
+      <HintPath>..\packages\Google.Apis.Auth.1.21.0\lib\net45\Google.Apis.Auth.dll</HintPath>
     </Reference>
     <Reference Include="Google.Apis.Auth.PlatformServices">
-      <HintPath>..\packages\Google.Apis.Auth.1.16.0\lib\net45\Google.Apis.Auth.PlatformServices.dll</HintPath>
+      <HintPath>..\packages\Google.Apis.Auth.1.21.0\lib\net45\Google.Apis.Auth.PlatformServices.dll</HintPath>
+    </Reference>
+    <Reference Include="Newtonsoft.Json">
+      <HintPath>..\packages\Newtonsoft.Json.9.0.1\lib\net45\Newtonsoft.Json.dll</HintPath>
     </Reference>
   </ItemGroup>
   <ItemGroup>
diff --git a/src/csharp/Grpc.Auth/packages.config b/src/csharp/Grpc.Auth/packages.config
index 11c6375c63..aecc65e849 100644
--- a/src/csharp/Grpc.Auth/packages.config
+++ b/src/csharp/Grpc.Auth/packages.config
@@ -1,10 +1,8 @@
 <?xml version="1.0" encoding="utf-8"?>
 <packages>
-  <package id="BouncyCastle" version="1.7.0" targetFramework="net45" />
-  <package id="Google.Apis" version="1.16.0" targetFramework="net45" />
-  <package id="Google.Apis.Auth" version="1.16.0" targetFramework="net45" />
-  <package id="Google.Apis.Core" version="1.16.0" targetFramework="net45" />
-  <package id="log4net" version="2.0.3" targetFramework="net45" />
-  <package id="Newtonsoft.Json" version="7.0.1" targetFramework="net45" />
+  <package id="Google.Apis" version="1.21.0" targetFramework="net45" />
+  <package id="Google.Apis.Auth" version="1.21.0" targetFramework="net45" />
+  <package id="Google.Apis.Core" version="1.21.0" targetFramework="net45" />
+  <package id="Newtonsoft.Json" version="9.0.1" targetFramework="net45" />
   <package id="Zlib.Portable.Signed" version="1.11.0" targetFramework="net45" />
 </packages>
\ No newline at end of file
diff --git a/src/csharp/Grpc.Auth/project.json b/src/csharp/Grpc.Auth/project.json
index 3805f4759e..170149ace5 100644
--- a/src/csharp/Grpc.Auth/project.json
+++ b/src/csharp/Grpc.Auth/project.json
@@ -22,7 +22,7 @@
   },
   "dependencies": {
     "Grpc.Core": "1.2.0-dev",
-    "Google.Apis.Auth": "1.16.0"
+    "Google.Apis.Auth": "1.21.0"
   },
   "frameworks": {
     "net45": { },
diff --git a/src/csharp/Grpc.Core.Tests/AuthContextTest.cs b/src/csharp/Grpc.Core.Tests/AuthContextTest.cs
new file mode 100644
index 0000000000..f5fa469520
--- /dev/null
+++ b/src/csharp/Grpc.Core.Tests/AuthContextTest.cs
@@ -0,0 +1,86 @@
+#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 NUnit.Framework;
+using Grpc.Core;
+using System.Linq;
+
+namespace Grpc.Core.Tests
+{
+    public class AuthContextTest
+    {
+        [Test]
+        public void EmptyContext()
+        {
+            var context = new AuthContext(null, new Dictionary<string, List<AuthProperty>>());
+            Assert.IsFalse(context.IsPeerAuthenticated);
+            Assert.IsNull(context.PeerIdentityPropertyName);
+            Assert.AreEqual(0, context.PeerIdentity.Count());
+            Assert.AreEqual(0, context.Properties.Count());
+            Assert.AreEqual(0, context.FindPropertiesByName("nonexistent").Count());
+        }
+
+        [Test]
+        public void AuthenticatedContext()
+        {
+            var property1 = AuthProperty.Create("abc", new byte[] { 68, 69, 70 });
+            var context = new AuthContext("some_identity", new Dictionary<string, List<AuthProperty>>
+            {
+                {"some_identity", new List<AuthProperty> {property1}}
+            });
+            Assert.IsTrue(context.IsPeerAuthenticated);
+            Assert.AreEqual("some_identity", context.PeerIdentityPropertyName);
+            Assert.AreEqual(1, context.PeerIdentity.Count());
+        }
+
+        [Test]
+        public void FindPropertiesByName()
+        {
+            var property1 = AuthProperty.Create("abc", new byte[] {68, 69, 70});
+            var property2 = AuthProperty.Create("abc", new byte[] {71, 72, 73 });
+            var property3 = AuthProperty.Create("abc", new byte[] {});
+            var context = new AuthContext(null, new Dictionary<string, List<AuthProperty>>
+            {
+                {"existent", new List<AuthProperty> {property1, property2}},
+                {"foobar", new List<AuthProperty> {property3}},
+            });
+            Assert.AreEqual(3, context.Properties.Count());
+            Assert.AreEqual(0, context.FindPropertiesByName("nonexistent").Count());
+
+            var existentProperties = new List<AuthProperty>(context.FindPropertiesByName("existent"));
+            Assert.AreEqual(2, existentProperties.Count);
+        }
+    }
+}
diff --git a/src/csharp/Grpc.Core.Tests/AuthPropertyTest.cs b/src/csharp/Grpc.Core.Tests/AuthPropertyTest.cs
new file mode 100644
index 0000000000..745191b80d
--- /dev/null
+++ b/src/csharp/Grpc.Core.Tests/AuthPropertyTest.cs
@@ -0,0 +1,82 @@
+#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 NUnit.Framework;
+
+namespace Grpc.Core.Tests
+{
+    public class AuthPropertyTest
+    {
+        [Test]
+        public void Create_NameIsNotNull()
+        {
+            Assert.Throws(typeof(ArgumentNullException), () => AuthProperty.Create(null, new byte[0]));
+            Assert.Throws(typeof(ArgumentNullException), () => AuthProperty.CreateUnsafe(null, new byte[0]));
+        }
+
+        [Test]
+        public void Create_ValueIsNotNull()
+        {
+            Assert.Throws(typeof(ArgumentNullException), () => AuthProperty.Create("abc", null));
+            Assert.Throws(typeof(ArgumentNullException), () => AuthProperty.CreateUnsafe("abc", null));
+        }
+
+        [Test]
+        public void Create()
+        {
+            var valueBytes = new byte[] { 68, 69, 70 };
+            var authProperty = AuthProperty.Create("abc", valueBytes);
+
+            Assert.AreEqual("abc", authProperty.Name);
+            Assert.AreNotSame(valueBytes, authProperty.ValueBytesUnsafe);
+            CollectionAssert.AreEqual(valueBytes, authProperty.ValueBytes);
+            CollectionAssert.AreEqual(valueBytes, authProperty.ValueBytesUnsafe);
+            Assert.AreEqual("DEF", authProperty.Value);
+        }
+
+        [Test]
+        public void CreateUnsafe()
+        {
+            var valueBytes = new byte[] { 68, 69, 70 };
+            var authProperty = AuthProperty.CreateUnsafe("abc", valueBytes);
+
+            Assert.AreEqual("abc", authProperty.Name);
+            Assert.AreSame(valueBytes, authProperty.ValueBytesUnsafe);
+            Assert.AreNotSame(valueBytes, authProperty.ValueBytes);
+            CollectionAssert.AreEqual(valueBytes, authProperty.ValueBytes);
+            CollectionAssert.AreEqual(valueBytes, authProperty.ValueBytesUnsafe);
+            Assert.AreEqual("DEF", authProperty.Value);
+        }
+    }
+}
diff --git a/src/csharp/Grpc.Core.Tests/ClientServerTest.cs b/src/csharp/Grpc.Core.Tests/ClientServerTest.cs
index 6bf9756962..3a99107c42 100644
--- a/src/csharp/Grpc.Core.Tests/ClientServerTest.cs
+++ b/src/csharp/Grpc.Core.Tests/ClientServerTest.cs
@@ -376,6 +376,18 @@ namespace Grpc.Core.Tests
         }
 
         [Test]
+        public void ServerCallContext_AuthContextNotPopulated()
+        {
+            helper.UnaryHandler = new UnaryServerMethod<string, string>(async (request, context) =>
+            {
+                Assert.IsFalse(context.AuthContext.IsPeerAuthenticated);
+                Assert.AreEqual(0, context.AuthContext.Properties.Count());
+                return "PASS";
+            });
+            Assert.AreEqual("PASS", Calls.BlockingUnaryCall(helper.CreateUnaryCall(), "abc"));
+        }
+
+        [Test]
         public async Task Channel_WaitForStateChangedAsync()
         {
             helper.UnaryHandler = new UnaryServerMethod<string, string>(async (request, context) =>
diff --git a/src/csharp/Grpc.Core.Tests/Grpc.Core.Tests.csproj b/src/csharp/Grpc.Core.Tests/Grpc.Core.Tests.csproj
index 646effe21a..a1a2e4eebd 100644
--- a/src/csharp/Grpc.Core.Tests/Grpc.Core.Tests.csproj
+++ b/src/csharp/Grpc.Core.Tests/Grpc.Core.Tests.csproj
@@ -27,17 +27,17 @@
   </PropertyGroup>
   <ItemGroup>
     <Reference Include="System" />
-    <Reference Include="nunit.framework">
-      <HintPath>..\packages\NUnit.3.2.0\lib\net45\nunit.framework.dll</HintPath>
-    </Reference>
-    <Reference Include="nunitlite">
-      <HintPath>..\packages\NUnitLite.3.2.0\lib\net45\nunitlite.dll</HintPath>
+    <Reference Include="System.Interactive.Async">
+      <HintPath>..\packages\System.Interactive.Async.3.1.1\lib\net45\System.Interactive.Async.dll</HintPath>
     </Reference>
     <Reference Include="Newtonsoft.Json">
-      <HintPath>..\packages\Newtonsoft.Json.7.0.1\lib\net45\Newtonsoft.Json.dll</HintPath>
+      <HintPath>..\packages\Newtonsoft.Json.9.0.1\lib\net45\Newtonsoft.Json.dll</HintPath>
     </Reference>
-    <Reference Include="System.Interactive.Async">
-      <HintPath>..\packages\System.Interactive.Async.3.1.1\lib\net45\System.Interactive.Async.dll</HintPath>
+    <Reference Include="nunit.framework">
+      <HintPath>..\packages\NUnit.3.6.0\lib\net45\nunit.framework.dll</HintPath>
+    </Reference>
+    <Reference Include="nunitlite">
+      <HintPath>..\packages\NUnitLite.3.6.0\lib\net45\nunitlite.dll</HintPath>
     </Reference>
   </ItemGroup>
   <ItemGroup>
@@ -64,7 +64,6 @@
     <Compile Include="ChannelOptionsTest.cs" />
     <Compile Include="Internal\TimespecTest.cs" />
     <Compile Include="TimeoutsTest.cs" />
-    <Compile Include="NUnitVersionTest.cs" />
     <Compile Include="ChannelTest.cs" />
     <Compile Include="MockServiceHelper.cs" />
     <Compile Include="ResponseHeadersTest.cs" />
@@ -81,6 +80,8 @@
     <Compile Include="ShutdownHookPendingCallTest.cs" />
     <Compile Include="ShutdownHookClientTest.cs" />
     <Compile Include="AppDomainUnloadTest.cs" />
+    <Compile Include="AuthContextTest.cs" />
+    <Compile Include="AuthPropertyTest.cs" />
   </ItemGroup>
   <Import Project="$(MSBuildBinPath)\Microsoft.CSharp.targets" />
   <ItemGroup>
diff --git a/src/csharp/Grpc.Core.Tests/TestResult.xml b/src/csharp/Grpc.Core.Tests/TestResult.xml
deleted file mode 100644
index 13da80739c..0000000000
--- a/src/csharp/Grpc.Core.Tests/TestResult.xml
+++ /dev/null
@@ -1,41 +0,0 @@
-<?xml version="1.0" encoding="utf-8" standalone="no"?>
-<!--This file represents the results of running a test suite-->
-<test-results name="/usr/local/google/home/jtattermusch/github/grpc/src/csharp/GrpcCoreTests/bin/Debug/GrpcCoreTests.dll" total="3" errors="0" failures="0" not-run="0" inconclusive="0" ignored="0" skipped="0" invalid="0" date="2015-01-29" time="19:40:47">
-  <environment nunit-version="2.6.0.0" clr-version="4.0.30319.17020" os-version="Unix 3.13.0.43" platform="Unix" cwd="/usr/local/google/home/jtattermusch/github/grpc/src/csharp/GrpcCoreTests" machine-name="jtattermusch.mtv.corp.google.com" user="jtattermusch" user-domain="jtattermusch.mtv.corp.google.com" />
-  <culture-info current-culture="en-US" current-uiculture="en-US" />
-  <test-suite type="Assembly" name="/usr/local/google/home/jtattermusch/github/grpc/src/csharp/GrpcCoreTests/bin/Debug/GrpcCoreTests.dll" executed="True" result="Success" success="True" time="0.172" asserts="0">
-    <results>
-      <test-suite type="Namespace" name="Google" executed="True" result="Success" success="True" time="0.166" asserts="0">
-        <results>
-          <test-suite type="Namespace" name="GRPC" executed="True" result="Success" success="True" time="0.166" asserts="0">
-            <results>
-              <test-suite type="Namespace" name="Core" executed="True" result="Success" success="True" time="0.166" asserts="0">
-                <results>
-                  <test-suite type="Namespace" name="Tests" executed="True" result="Success" success="True" time="0.166" asserts="0">
-                    <results>
-                      <test-suite type="TestFixture" name="CallsTest" executed="True" result="Success" success="True" time="0.009" asserts="0">
-                        <results>
-                          <test-case name="Grpc.Core.Tests.CallsTest.Test1" executed="True" result="Success" success="True" time="0.004" asserts="0" />
-                        </results>
-                      </test-suite>
-                      <test-suite type="TestFixture" name="ClientServerTest" executed="True" result="Success" success="True" time="0.149" asserts="0">
-                        <results>
-                          <test-case name="Grpc.Core.Tests.ClientServerTest.EmptyCall" executed="True" result="Success" success="True" time="0.111" asserts="0" />
-                        </results>
-                      </test-suite>
-                      <test-suite type="TestFixture" name="ServerTest" executed="True" result="Success" success="True" time="0.001" asserts="0">
-                        <results>
-                          <test-case name="Grpc.Core.Tests.ServerTest.StartAndShutdownServer" executed="True" result="Success" success="True" time="0.001" asserts="0" />
-                        </results>
-                      </test-suite>
-                    </results>
-                  </test-suite>
-                </results>
-              </test-suite>
-            </results>
-          </test-suite>
-        </results>
-      </test-suite>
-    </results>
-  </test-suite>
-</test-results>
\ No newline at end of file
diff --git a/src/csharp/Grpc.Core.Tests/packages.config b/src/csharp/Grpc.Core.Tests/packages.config
index 4750735fad..994a278762 100644
--- a/src/csharp/Grpc.Core.Tests/packages.config
+++ b/src/csharp/Grpc.Core.Tests/packages.config
@@ -1,9 +1,8 @@
 <?xml version="1.0" encoding="utf-8"?>
 <packages>
-  <package id="Newtonsoft.Json" version="7.0.1" targetFramework="net45" />
-  <package id="NUnit" version="3.2.0" targetFramework="net45" />
-  <package id="NUnit.ConsoleRunner" version="3.2.0" />
-  <package id="NUnitLite" version="3.2.0" targetFramework="net45" />
+  <package id="Newtonsoft.Json" version="9.0.1" targetFramework="net45" />
+  <package id="NUnit" version="3.6.0" targetFramework="net45" />
+  <package id="NUnitLite" version="3.6.0" targetFramework="net45" />
   <package id="OpenCover" version="4.6.519" />
   <package id="ReportGenerator" version="2.4.4.0" />
   <package id="System.Interactive.Async" version="3.1.1" targetFramework="net45" />
diff --git a/src/csharp/Grpc.Core.Tests/project.json b/src/csharp/Grpc.Core.Tests/project.json
index 045207a413..14e5ed51ad 100644
--- a/src/csharp/Grpc.Core.Tests/project.json
+++ b/src/csharp/Grpc.Core.Tests/project.json
@@ -45,10 +45,10 @@
     "Grpc.Core": {
       "target": "project"
     },
-    "Newtonsoft.Json": "8.0.3",
-    "NUnit": "3.2.0",
-    "NUnitLite": "3.2.0-*",
-    "NUnit.ConsoleRunner": "3.2.0",
+    "Newtonsoft.Json": "9.0.1",
+    "NUnit": "3.6.0",
+    "NUnitLite": "3.6.0",
+    "NUnit.ConsoleRunner": "3.6.0",
     "OpenCover": "4.6.519",
     "ReportGenerator": "2.4.4.0"
   },
diff --git a/src/csharp/Grpc.Core/AuthContext.cs b/src/csharp/Grpc.Core/AuthContext.cs
new file mode 100644
index 0000000000..340b2201c7
--- /dev/null
+++ b/src/csharp/Grpc.Core/AuthContext.cs
@@ -0,0 +1,128 @@
+#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.Linq;
+using Grpc.Core.Internal;
+using Grpc.Core.Utils;
+
+namespace Grpc.Core
+{
+    /// <summary>
+    /// Authentication context for a call.
+    /// AuthContext is the only reliable source of truth when it comes to authenticating calls.
+    /// Using any other call/context properties for authentication purposes is wrong and inherently unsafe.
+    /// Note: experimental API that can change or be removed without any prior notice.
+    /// </summary>
+    public class AuthContext
+    {
+        string peerIdentityPropertyName;
+        Dictionary<string, List<AuthProperty>> properties;
+
+        /// <summary>
+        /// Initializes a new instance of the <see cref="T:Grpc.Core.AuthContext"/> class.
+        /// </summary>
+        /// <param name="peerIdentityPropertyName">Peer identity property name.</param>
+        /// <param name="properties">Multimap of auth properties by name.</param>
+        internal AuthContext(string peerIdentityPropertyName, Dictionary<string, List<AuthProperty>> properties)
+        {
+            this.peerIdentityPropertyName = peerIdentityPropertyName;
+            this.properties = GrpcPreconditions.CheckNotNull(properties);
+        }
+
+        /// <summary>
+        /// Returns <c>true</c> if the peer is authenticated.
+        /// </summary>
+        public bool IsPeerAuthenticated
+        {
+            get
+            {
+                return peerIdentityPropertyName != null;
+            }
+        }
+
+        /// <summary>
+        /// Gets the name of the property that indicates the peer identity. Returns <c>null</c>
+        /// if the peer is not authenticated.
+        /// </summary>
+        public string PeerIdentityPropertyName
+        {
+            get
+            {
+                return peerIdentityPropertyName;
+            }
+        }
+
+        /// <summary>
+        /// Gets properties that represent the peer identity (there can be more than one). Returns an empty collection
+        /// if the peer is not authenticated.
+        /// </summary>
+        public IEnumerable<AuthProperty> PeerIdentity
+        {
+            get
+            {
+                if (peerIdentityPropertyName == null)
+                {
+                    return Enumerable.Empty<AuthProperty>();
+                }
+                return properties[peerIdentityPropertyName];
+            }
+        }
+
+        /// <summary>
+        /// Gets the auth properties of this context.
+        /// </summary>
+        public IEnumerable<AuthProperty> Properties
+        {
+            get
+            {
+                return properties.Values.SelectMany(v => v);
+            }
+        }
+
+        /// <summary>
+        /// Returns the auth properties with given name (there can be more than one).
+        /// If no properties of given name exist, an empty collection will be returned.
+        /// </summary>
+        public IEnumerable<AuthProperty> FindPropertiesByName(string propertyName)
+        {
+            List<AuthProperty> result;
+            if (!properties.TryGetValue(propertyName, out result))
+            {
+                return Enumerable.Empty<AuthProperty>();
+            }
+            return result;
+        }
+    }
+}
diff --git a/src/csharp/Grpc.Core/AuthProperty.cs b/src/csharp/Grpc.Core/AuthProperty.cs
new file mode 100644
index 0000000000..c7a132b09e
--- /dev/null
+++ b/src/csharp/Grpc.Core/AuthProperty.cs
@@ -0,0 +1,126 @@
+#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.Linq;
+using Grpc.Core.Internal;
+using Grpc.Core.Utils;
+
+namespace Grpc.Core
+{
+    /// <summary>
+    /// A property of an <see cref="AuthContext"/>.
+    /// Note: experimental API that can change or be removed without any prior notice.
+    /// </summary>
+    public class AuthProperty
+    {
+        string name;
+        byte[] valueBytes;
+        Lazy<string> value;
+
+        private AuthProperty(string name, byte[] valueBytes)
+        {
+            this.name = GrpcPreconditions.CheckNotNull(name);
+            this.valueBytes = GrpcPreconditions.CheckNotNull(valueBytes);
+            this.value = new Lazy<string>(() => MarshalUtils.GetStringUTF8(this.valueBytes));
+        }
+
+        /// <summary>
+        /// Gets the name of the property.
+        /// </summary>
+        public string Name
+        {
+            get
+            {
+                return name;
+            }
+        }
+
+        /// <summary>
+        /// Gets the string value of the property.
+        /// </summary>
+        public string Value
+        {
+            get
+            {
+                return value.Value;
+            }
+        }
+
+        /// <summary>
+        /// Gets the binary value of the property.
+        /// </summary>
+        public byte[] ValueBytes
+        {
+            get
+            {
+                var valueCopy = new byte[valueBytes.Length];
+                Buffer.BlockCopy(valueBytes, 0, valueCopy, 0, valueBytes.Length);
+                return valueCopy;
+            }
+        }
+
+        /// <summary>
+        /// Creates an instance of <c>AuthProperty</c>.
+        /// </summary>
+        /// <param name="name">the name</param>
+        /// <param name="valueBytes">the binary value of the property</param>
+        public static AuthProperty Create(string name, byte[] valueBytes)
+        {
+            GrpcPreconditions.CheckNotNull(valueBytes);
+            var valueCopy = new byte[valueBytes.Length];
+            Buffer.BlockCopy(valueBytes, 0, valueCopy, 0, valueBytes.Length);
+            return new AuthProperty(name, valueCopy);
+        }
+
+        /// <summary>
+        /// Gets the binary value of the property (without making a defensive copy).
+        /// </summary>
+        internal byte[] ValueBytesUnsafe
+        {
+            get
+            {
+                return valueBytes;
+            }
+        }
+
+        /// <summary>
+        /// Creates and instance of <c>AuthProperty</c> without making a defensive copy of <c>valueBytes</c>.
+        /// </summary>
+        internal static AuthProperty CreateUnsafe(string name, byte[] valueBytes)
+        {
+            return new AuthProperty(name, valueBytes);
+        }
+    }
+}
diff --git a/src/csharp/Grpc.Core/Grpc.Core.csproj b/src/csharp/Grpc.Core/Grpc.Core.csproj
index 23e1ddcf7f..d6d8dfac22 100644
--- a/src/csharp/Grpc.Core/Grpc.Core.csproj
+++ b/src/csharp/Grpc.Core/Grpc.Core.csproj
@@ -131,6 +131,10 @@
     <Compile Include="Internal\RequestCallContextSafeHandle.cs" />
     <Compile Include="Utils\TaskUtils.cs" />
     <Compile Include="Internal\CallFlags.cs" />
+    <Compile Include="AuthContext.cs" />
+    <Compile Include="Internal\AuthContextSafeHandle.cs" />
+    <Compile Include="Internal\MarshalUtils.cs" />
+    <Compile Include="AuthProperty.cs" />
   </ItemGroup>
   <ItemGroup>
     <None Include="Grpc.Core.project.json" />
diff --git a/src/csharp/Grpc.Core/Internal/AuthContextSafeHandle.cs b/src/csharp/Grpc.Core/Internal/AuthContextSafeHandle.cs
new file mode 100644
index 0000000000..59e33a0fdf
--- /dev/null
+++ b/src/csharp/Grpc.Core/Internal/AuthContextSafeHandle.cs
@@ -0,0 +1,119 @@
+#region Copyright notice and license
+
+// Copyright 2017, 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.Runtime.InteropServices;
+using System.Text;
+using Grpc.Core;
+using Grpc.Core.Utils;
+
+namespace Grpc.Core.Internal
+{
+    /// <summary>
+    /// grpc_auth_context
+    /// </summary>
+    internal class AuthContextSafeHandle : SafeHandleZeroIsInvalid
+    {
+        static readonly NativeMethods Native = NativeMethods.Get();
+
+        private AuthContextSafeHandle()
+        {
+        }
+
+        /// <summary>
+        /// Copies contents of the native auth context into a new <c>AuthContext</c> instance.
+        /// </summary>
+        public AuthContext ToAuthContext()
+        {
+            if (IsInvalid)
+            {
+                return new AuthContext(null, new Dictionary<string, List<AuthProperty>>());
+            }
+
+            var peerIdentityPropertyName = Marshal.PtrToStringAnsi(Native.grpcsharp_auth_context_peer_identity_property_name(this));
+
+            var propertiesDict = new Dictionary<string, List<AuthProperty>>();
+
+            var it = Native.grpcsharp_auth_context_property_iterator(this);
+            IntPtr authPropertyPtr = IntPtr.Zero;
+            while ((authPropertyPtr = Native.grpcsharp_auth_property_iterator_next(ref it)) != IntPtr.Zero)
+            {
+                var authProperty = PtrToAuthProperty(authPropertyPtr);
+
+                if (!propertiesDict.ContainsKey(authProperty.Name))
+                {
+                    propertiesDict[authProperty.Name] = new List<AuthProperty>();
+                }
+                propertiesDict[authProperty.Name].Add(authProperty);
+            }
+
+            return new AuthContext(peerIdentityPropertyName, propertiesDict);
+        }
+
+        protected override bool ReleaseHandle()
+        {
+            Native.grpcsharp_auth_context_release(handle);
+            return true;
+        }
+
+        private AuthProperty PtrToAuthProperty(IntPtr authPropertyPtr)
+        {
+            var nativeAuthProperty = (NativeAuthProperty) Marshal.PtrToStructure(authPropertyPtr, typeof(NativeAuthProperty));
+            var name = Marshal.PtrToStringAnsi(nativeAuthProperty.Name);
+            var valueBytes = new byte[(int) nativeAuthProperty.ValueLength];
+            Marshal.Copy(nativeAuthProperty.Value, valueBytes, 0, (int)nativeAuthProperty.ValueLength);
+            return AuthProperty.CreateUnsafe(name, valueBytes);
+        }
+
+        /// <summary>
+        /// grpc_auth_property
+        /// </summary>
+        internal struct NativeAuthProperty
+        {
+            public IntPtr Name;
+            public IntPtr Value;
+            public UIntPtr ValueLength;
+        }
+
+        /// <summary>
+        /// grpc_auth_property_iterator
+        /// </summary>
+        internal struct NativeAuthPropertyIterator
+        {
+            public IntPtr AuthContext;
+            public UIntPtr Index;
+            public IntPtr Name;
+        }
+    }
+}
diff --git a/src/csharp/Grpc.Core/Internal/BatchContextSafeHandle.cs b/src/csharp/Grpc.Core/Internal/BatchContextSafeHandle.cs
index efae149f09..6dee6d8c35 100644
--- a/src/csharp/Grpc.Core/Internal/BatchContextSafeHandle.cs
+++ b/src/csharp/Grpc.Core/Internal/BatchContextSafeHandle.cs
@@ -43,7 +43,6 @@ namespace Grpc.Core.Internal
     /// </summary>
     internal class BatchContextSafeHandle : SafeHandleZeroIsInvalid
     {
-        static readonly Encoding EncodingUTF8 = System.Text.Encoding.UTF8;
         static readonly NativeMethods Native = NativeMethods.Get();
 
         private BatchContextSafeHandle()
@@ -75,7 +74,7 @@ namespace Grpc.Core.Internal
         {
             UIntPtr detailsLength;
             IntPtr detailsPtr = Native.grpcsharp_batch_context_recv_status_on_client_details(this, out detailsLength);
-            string details = PtrToStringUtf8(detailsPtr, (int) detailsLength.ToUInt32());
+            string details = MarshalUtils.PtrToStringUTF8(detailsPtr, (int) detailsLength.ToUInt32());
             var status = new Status(Native.grpcsharp_batch_context_recv_status_on_client_status(this), details);
 
             IntPtr metadataArrayPtr = Native.grpcsharp_batch_context_recv_status_on_client_trailing_metadata(this);
@@ -108,12 +107,5 @@ namespace Grpc.Core.Internal
             Native.grpcsharp_batch_context_destroy(handle);
             return true;
         }
-
-        string PtrToStringUtf8(IntPtr ptr, int len)
-        {
-            var bytes = new byte[len];
-            Marshal.Copy(ptr, bytes, 0, len);
-            return EncodingUTF8.GetString(bytes);
-        }
     }
 }
diff --git a/src/csharp/Grpc.Core/Internal/CallSafeHandle.cs b/src/csharp/Grpc.Core/Internal/CallSafeHandle.cs
index 710ca480e8..3c368fbc6c 100644
--- a/src/csharp/Grpc.Core/Internal/CallSafeHandle.cs
+++ b/src/csharp/Grpc.Core/Internal/CallSafeHandle.cs
@@ -45,7 +45,6 @@ namespace Grpc.Core.Internal
     internal class CallSafeHandle : SafeHandleZeroIsInvalid, INativeCall
     {
         public static readonly CallSafeHandle NullInstance = new CallSafeHandle();
-        static readonly Encoding EncodingUTF8 = System.Text.Encoding.UTF8;
         static readonly NativeMethods Native = NativeMethods.Get();
 
         const uint GRPC_WRITE_BUFFER_HINT = 1;
@@ -140,7 +139,7 @@ namespace Grpc.Core.Internal
                 var ctx = BatchContextSafeHandle.Create();
                 var optionalPayloadLength = optionalPayload != null ? new UIntPtr((ulong)optionalPayload.Length) : UIntPtr.Zero;
                 completionQueue.CompletionRegistry.RegisterBatchCompletion(ctx, (success, context) => callback(success));
-                var statusDetailBytes = EncodingUTF8.GetBytes(status.Detail);
+                var statusDetailBytes = MarshalUtils.GetBytesUTF8(status.Detail);
                 Native.grpcsharp_call_send_status_from_server(this, ctx, status.StatusCode, statusDetailBytes, new UIntPtr((ulong)statusDetailBytes.Length), metadataArray, sendEmptyInitialMetadata,
                     optionalPayload, optionalPayloadLength, writeFlags).CheckOk();
             }
@@ -204,6 +203,11 @@ namespace Grpc.Core.Internal
             }
         }
 
+        public AuthContextSafeHandle GetAuthContext()
+        {
+            return Native.grpcsharp_call_auth_context(this);
+        }
+
         protected override bool ReleaseHandle()
         {
             Native.grpcsharp_call_destroy(handle);
diff --git a/src/csharp/Grpc.Core.Tests/NUnitVersionTest.cs b/src/csharp/Grpc.Core/Internal/MarshalUtils.cs
index 1a9e441611..897e2f70bb 100644
--- a/src/csharp/Grpc.Core.Tests/NUnitVersionTest.cs
+++ b/src/csharp/Grpc.Core/Internal/MarshalUtils.cs
@@ -32,46 +32,59 @@
 #endregion
 
 using System;
-using System.Threading;
-using System.Threading.Tasks;
-using Grpc.Core;
-using Grpc.Core.Internal;
-using Grpc.Core.Utils;
-using NUnit.Framework;
+using System.Runtime.InteropServices;
+using System.Text;
 
-namespace Grpc.Core.Tests
+namespace Grpc.Core.Internal
 {
     /// <summary>
-    /// Tests if the version of nunit-console used is sufficient to run async tests.
+    /// Useful methods for native/managed marshalling.
     /// </summary>
-    public class NUnitVersionTest
+    internal static class MarshalUtils
     {
-        private int testRunCount = 0;
+        static readonly Encoding EncodingUTF8 = System.Text.Encoding.UTF8;
+        static readonly Encoding EncodingASCII = System.Text.Encoding.ASCII;
 
-        [TestFixtureTearDown]
-        public void Cleanup()
+        /// <summary>
+        /// Converts <c>IntPtr</c> pointing to a UTF-8 encoded byte array to <c>string</c>.
+        /// </summary>
+        public static string PtrToStringUTF8(IntPtr ptr, int len)
         {
-            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();
-                throw new Exception("NUnitVersionTest has failed.");
-            }
+            var bytes = new byte[len];
+            Marshal.Copy(ptr, bytes, 0, len);
+            return EncodingUTF8.GetString(bytes);
         }
 
-        [Test]
-        public void NUnitVersionTest1()
+        /// <summary>
+        /// Returns byte array containing UTF-8 encoding of given string.
+        /// </summary>
+        public static byte[] GetBytesUTF8(string str)
         {
-            testRunCount++;
+            return EncodingUTF8.GetBytes(str);
         }
 
-        // Old version of NUnit will skip this test
-        [Test]
-        public async Task NUnitVersionTest2()
+        /// <summary>
+        /// Get string from a UTF8 encoded byte array.
+        /// </summary>
+        public static string GetStringUTF8(byte[] bytes)
         {
-            testRunCount++;
-            await Task.Delay(10);
+            return EncodingUTF8.GetString(bytes);
+        }
+
+        /// <summary>
+        /// Returns byte array containing ASCII encoding of given string.
+        /// </summary>
+        public static byte[] GetBytesASCII(string str)
+        {
+            return EncodingASCII.GetBytes(str);
+        }
+
+        /// <summary>
+        /// Get string from an ASCII encoded byte array.
+        /// </summary>
+        public static string GetStringASCII(byte[] bytes)
+        {
+            return EncodingASCII.GetString(bytes);
         }
     }
 }
diff --git a/src/csharp/Grpc.Core/Internal/NativeMethods.cs b/src/csharp/Grpc.Core/Internal/NativeMethods.cs
index aff9550e8d..dd65f05217 100644
--- a/src/csharp/Grpc.Core/Internal/NativeMethods.cs
+++ b/src/csharp/Grpc.Core/Internal/NativeMethods.cs
@@ -148,6 +148,12 @@ namespace Grpc.Core.Internal
         public readonly Delegates.grpcsharp_server_shutdown_and_notify_callback_delegate grpcsharp_server_shutdown_and_notify_callback;
         public readonly Delegates.grpcsharp_server_destroy_delegate grpcsharp_server_destroy;
 
+        public readonly Delegates.grpcsharp_call_auth_context_delegate grpcsharp_call_auth_context;
+        public readonly Delegates.grpcsharp_auth_context_peer_identity_property_name_delegate grpcsharp_auth_context_peer_identity_property_name;
+        public readonly Delegates.grpcsharp_auth_context_property_iterator_delegate grpcsharp_auth_context_property_iterator;
+        public readonly Delegates.grpcsharp_auth_property_iterator_next_delegate grpcsharp_auth_property_iterator_next;
+        public readonly Delegates.grpcsharp_auth_context_release_delegate grpcsharp_auth_context_release;
+
         public readonly Delegates.gprsharp_now_delegate gprsharp_now;
         public readonly Delegates.gprsharp_inf_future_delegate gprsharp_inf_future;
         public readonly Delegates.gprsharp_inf_past_delegate gprsharp_inf_past;
@@ -256,6 +262,12 @@ namespace Grpc.Core.Internal
             this.grpcsharp_server_shutdown_and_notify_callback = GetMethodDelegate<Delegates.grpcsharp_server_shutdown_and_notify_callback_delegate>(library);
             this.grpcsharp_server_destroy = GetMethodDelegate<Delegates.grpcsharp_server_destroy_delegate>(library);
 
+            this.grpcsharp_call_auth_context = GetMethodDelegate<Delegates.grpcsharp_call_auth_context_delegate>(library);
+            this.grpcsharp_auth_context_peer_identity_property_name = GetMethodDelegate<Delegates.grpcsharp_auth_context_peer_identity_property_name_delegate>(library);
+            this.grpcsharp_auth_context_property_iterator = GetMethodDelegate<Delegates.grpcsharp_auth_context_property_iterator_delegate>(library);
+            this.grpcsharp_auth_property_iterator_next = GetMethodDelegate<Delegates.grpcsharp_auth_property_iterator_next_delegate>(library);
+            this.grpcsharp_auth_context_release = GetMethodDelegate<Delegates.grpcsharp_auth_context_release_delegate>(library);
+
             this.gprsharp_now = GetMethodDelegate<Delegates.gprsharp_now_delegate>(library);
             this.gprsharp_inf_future = GetMethodDelegate<Delegates.gprsharp_inf_future_delegate>(library);
             this.gprsharp_inf_past = GetMethodDelegate<Delegates.gprsharp_inf_past_delegate>(library);
@@ -404,6 +416,12 @@ namespace Grpc.Core.Internal
             public delegate void grpcsharp_server_shutdown_and_notify_callback_delegate(ServerSafeHandle server, CompletionQueueSafeHandle cq, BatchContextSafeHandle ctx);
             public delegate void grpcsharp_server_destroy_delegate(IntPtr server);
 
+            public delegate AuthContextSafeHandle grpcsharp_call_auth_context_delegate(CallSafeHandle call);
+            public delegate IntPtr grpcsharp_auth_context_peer_identity_property_name_delegate(AuthContextSafeHandle authContext);  // returns const char*
+            public delegate AuthContextSafeHandle.NativeAuthPropertyIterator grpcsharp_auth_context_property_iterator_delegate(AuthContextSafeHandle authContext);
+            public delegate IntPtr grpcsharp_auth_property_iterator_next_delegate(ref AuthContextSafeHandle.NativeAuthPropertyIterator iterator);  // returns const auth_property*
+            public delegate void grpcsharp_auth_context_release_delegate(IntPtr authContext);
+
             public delegate Timespec gprsharp_now_delegate(ClockType clockType);
             public delegate Timespec gprsharp_inf_future_delegate(ClockType clockType);
             public delegate Timespec gprsharp_inf_past_delegate(ClockType clockType);
diff --git a/src/csharp/Grpc.Core/Metadata.cs b/src/csharp/Grpc.Core/Metadata.cs
index 6fc715d6ee..6e195b49cc 100644
--- a/src/csharp/Grpc.Core/Metadata.cs
+++ b/src/csharp/Grpc.Core/Metadata.cs
@@ -32,12 +32,10 @@
 using System;
 using System.Collections;
 using System.Collections.Generic;
-using System.Collections.Specialized;
-using System.Globalization;
-using System.Runtime.InteropServices;
 using System.Text;
 using System.Text.RegularExpressions;
 
+using Grpc.Core.Internal;
 using Grpc.Core.Utils;
 
 namespace Grpc.Core
@@ -242,7 +240,6 @@ namespace Grpc.Core
         /// </summary>
         public class Entry
         {
-            private static readonly Encoding Encoding = Encoding.ASCII;
             private static readonly Regex ValidKeyRegex = new Regex("^[a-z0-9_-]+$");
 
             readonly string key;
@@ -306,7 +303,7 @@ namespace Grpc.Core
                 {
                     if (valueBytes == null)
                     {
-                        return Encoding.GetBytes(value);
+                        return MarshalUtils.GetBytesASCII(value);
                     }
 
                     // defensive copy to guarantee immutability
@@ -324,7 +321,7 @@ namespace Grpc.Core
                 get
                 {
                     GrpcPreconditions.CheckState(!IsBinary, "Cannot access string value of a binary metadata entry");
-                    return value ?? Encoding.GetString(valueBytes);
+                    return value ?? MarshalUtils.GetStringASCII(valueBytes);
                 }
             }
 
@@ -358,7 +355,7 @@ namespace Grpc.Core
             /// </summary>
             internal byte[] GetSerializedValueUnsafe()
             {
-                return valueBytes ?? Encoding.GetBytes(value);
+                return valueBytes ?? MarshalUtils.GetBytesASCII(value);
             }
 
             /// <summary>
@@ -371,7 +368,7 @@ namespace Grpc.Core
                 {
                     return new Entry(key, null, valueBytes);
                 }
-                return new Entry(key, Encoding.GetString(valueBytes), null);
+                return new Entry(key, MarshalUtils.GetStringASCII(valueBytes), null);
             }
 
             private static string NormalizeKey(string key)
diff --git a/src/csharp/Grpc.Core/ServerCallContext.cs b/src/csharp/Grpc.Core/ServerCallContext.cs
index 8f28fbc045..c8950b7677 100644
--- a/src/csharp/Grpc.Core/ServerCallContext.cs
+++ b/src/csharp/Grpc.Core/ServerCallContext.cs
@@ -32,7 +32,6 @@
 #endregion
 
 using System;
-using System.Runtime.CompilerServices;
 using System.Threading;
 using System.Threading.Tasks;
 
@@ -56,6 +55,7 @@ namespace Grpc.Core
         private Status status = Status.DefaultSuccess;
         private Func<Metadata, Task> writeHeadersFunc;
         private IHasWriteOptions writeOptionsHolder;
+        private Lazy<AuthContext> authContext;
 
         internal ServerCallContext(CallSafeHandle callHandle, string method, string host, DateTime deadline, Metadata requestHeaders, CancellationToken cancellationToken,
             Func<Metadata, Task> writeHeadersFunc, IHasWriteOptions writeOptionsHolder)
@@ -68,6 +68,7 @@ namespace Grpc.Core
             this.cancellationToken = cancellationToken;
             this.writeHeadersFunc = writeHeadersFunc;
             this.writeOptionsHolder = writeOptionsHolder;
+            this.authContext = new Lazy<AuthContext>(GetAuthContextEager);
         }
 
         /// <summary>
@@ -187,6 +188,26 @@ namespace Grpc.Core
                 writeOptionsHolder.WriteOptions = value;
             }
         }
+
+        /// <summary>
+        /// Gets the <c>AuthContext</c> associated with this call.
+        /// Note: Access to AuthContext is an experimental API that can change without any prior notice.
+        /// </summary>
+        public AuthContext AuthContext
+        {
+            get
+            {
+                return authContext.Value;
+            }
+        }
+
+        private AuthContext GetAuthContextEager()
+        {
+            using (var authContextNative = callHandle.GetAuthContext())
+            {
+                return authContextNative.ToAuthContext();
+            }
+        }
     }
 
     /// <summary>
diff --git a/src/csharp/Grpc.Examples.Tests/Grpc.Examples.Tests.csproj b/src/csharp/Grpc.Examples.Tests/Grpc.Examples.Tests.csproj
index d22fe87825..c96243b1c7 100644
--- a/src/csharp/Grpc.Examples.Tests/Grpc.Examples.Tests.csproj
+++ b/src/csharp/Grpc.Examples.Tests/Grpc.Examples.Tests.csproj
@@ -27,17 +27,17 @@
   </PropertyGroup>
   <ItemGroup>
     <Reference Include="System" />
+    <Reference Include="System.Interactive.Async">
+      <HintPath>..\packages\System.Interactive.Async.3.1.1\lib\net45\System.Interactive.Async.dll</HintPath>
+    </Reference>
     <Reference Include="nunit.framework">
-      <HintPath>..\packages\NUnit.3.2.0\lib\net45\nunit.framework.dll</HintPath>
+      <HintPath>..\packages\NUnit.3.6.0\lib\net45\nunit.framework.dll</HintPath>
     </Reference>
     <Reference Include="nunitlite">
-      <HintPath>..\packages\NUnitLite.3.2.0\lib\net45\nunitlite.dll</HintPath>
+      <HintPath>..\packages\NUnitLite.3.6.0\lib\net45\nunitlite.dll</HintPath>
     </Reference>
     <Reference Include="Google.Protobuf">
-      <HintPath>..\packages\Google.Protobuf.3.0.0\lib\net45\Google.Protobuf.dll</HintPath>
-    </Reference>
-    <Reference Include="System.Interactive.Async">
-      <HintPath>..\packages\System.Interactive.Async.3.1.1\lib\net45\System.Interactive.Async.dll</HintPath>
+      <HintPath>..\packages\Google.Protobuf.3.2.0\lib\net45\Google.Protobuf.dll</HintPath>
     </Reference>
   </ItemGroup>
   <ItemGroup>
diff --git a/src/csharp/Grpc.Examples.Tests/packages.config b/src/csharp/Grpc.Examples.Tests/packages.config
index 0fed4dbd41..8a7f7a0652 100644
--- a/src/csharp/Grpc.Examples.Tests/packages.config
+++ b/src/csharp/Grpc.Examples.Tests/packages.config
@@ -1,7 +1,7 @@
 <?xml version="1.0" encoding="utf-8"?>
 <packages>
-  <package id="Google.Protobuf" version="3.0.0" targetFramework="net45" />
-  <package id="NUnit" version="3.2.0" targetFramework="net45" />
-  <package id="NUnitLite" version="3.2.0" targetFramework="net45" />
+  <package id="Google.Protobuf" version="3.2.0" targetFramework="net45" />
+  <package id="NUnit" version="3.6.0" targetFramework="net45" />
+  <package id="NUnitLite" version="3.6.0" targetFramework="net45" />
   <package id="System.Interactive.Async" version="3.1.1" targetFramework="net45" />
 </packages>
\ No newline at end of file
diff --git a/src/csharp/Grpc.Examples.Tests/project.json b/src/csharp/Grpc.Examples.Tests/project.json
index e509621a29..4ffcaf57fd 100644
--- a/src/csharp/Grpc.Examples.Tests/project.json
+++ b/src/csharp/Grpc.Examples.Tests/project.json
@@ -45,8 +45,8 @@
     "Grpc.Examples": {
       "target": "project"
     },
-    "NUnit": "3.2.0",
-    "NUnitLite": "3.2.0-*"
+    "NUnit": "3.6.0",
+    "NUnitLite": "3.6.0"
   },
   "frameworks": {
     "net45": { },
diff --git a/src/csharp/Grpc.Examples/Grpc.Examples.csproj b/src/csharp/Grpc.Examples/Grpc.Examples.csproj
index 44acb6c2e3..fc927543f7 100644
--- a/src/csharp/Grpc.Examples/Grpc.Examples.csproj
+++ b/src/csharp/Grpc.Examples/Grpc.Examples.csproj
@@ -3,8 +3,6 @@
   <PropertyGroup>
     <Configuration Condition=" '$(Configuration)' == '' ">Debug</Configuration>
     <Platform Condition=" '$(Platform)' == '' ">AnyCPU</Platform>
-    <ProductVersion>10.0.0</ProductVersion>
-    <SchemaVersion>2.0</SchemaVersion>
     <ProjectGuid>{7DC1433E-3225-42C7-B7EA-546D56E27A4B}</ProjectGuid>
     <OutputType>Library</OutputType>
     <RootNamespace>Grpc.Examples</RootNamespace>
@@ -28,17 +26,17 @@
     <WarningLevel>4</WarningLevel>
   </PropertyGroup>
   <ItemGroup>
-    <Reference Include="nunit.framework">
-      <HintPath>..\packages\NUnit.3.2.0\lib\net45\nunit.framework.dll</HintPath>
-    </Reference>
     <Reference Include="System" />
     <Reference Include="System.Data.Linq" />
-    <Reference Include="Google.Protobuf">
-      <HintPath>..\packages\Google.Protobuf.3.0.0\lib\net45\Google.Protobuf.dll</HintPath>
-    </Reference>
     <Reference Include="System.Interactive.Async">
       <HintPath>..\packages\System.Interactive.Async.3.1.1\lib\net45\System.Interactive.Async.dll</HintPath>
     </Reference>
+    <Reference Include="nunit.framework">
+      <HintPath>..\packages\NUnit.3.6.0\lib\net45\nunit.framework.dll</HintPath>
+    </Reference>
+    <Reference Include="Google.Protobuf">
+      <HintPath>..\packages\Google.Protobuf.3.2.0\lib\net45\Google.Protobuf.dll</HintPath>
+    </Reference>
   </ItemGroup>
   <ItemGroup>
     <Compile Include="..\Grpc.Core\Version.cs">
diff --git a/src/csharp/Grpc.Examples/packages.config b/src/csharp/Grpc.Examples/packages.config
index c7db26bd64..79a898081e 100644
--- a/src/csharp/Grpc.Examples/packages.config
+++ b/src/csharp/Grpc.Examples/packages.config
@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="utf-8"?>
 <packages>
-  <package id="Google.Protobuf" version="3.0.0" targetFramework="net45" />
-  <package id="NUnit" version="3.2.0" targetFramework="net45" />
+  <package id="Google.Protobuf" version="3.2.0" targetFramework="net45" />
+  <package id="NUnit" version="3.6.0" targetFramework="net45" />
   <package id="System.Interactive.Async" version="3.1.1" targetFramework="net45" />
 </packages>
\ No newline at end of file
diff --git a/src/csharp/Grpc.Examples/project.json b/src/csharp/Grpc.Examples/project.json
index 21a730cb22..3ee0a71356 100644
--- a/src/csharp/Grpc.Examples/project.json
+++ b/src/csharp/Grpc.Examples/project.json
@@ -6,15 +6,10 @@
     "Grpc.Core": {
       "target": "project"
     },
-    "Google.Protobuf": "3.0.0"
+    "Google.Protobuf": "3.2.0"
   },
   "frameworks": {
-    "net45": {
-      "frameworkAssemblies": {
-        "System.Runtime": "",
-        "System.IO": ""
-      }
-    },
+    "net45": {},
     "netcoreapp1.0": {
       "dependencies": {
         "Microsoft.NETCore.App": {
diff --git a/src/csharp/Grpc.HealthCheck.Tests/Grpc.HealthCheck.Tests.csproj b/src/csharp/Grpc.HealthCheck.Tests/Grpc.HealthCheck.Tests.csproj
index b82f976861..71f0ee19b8 100644
--- a/src/csharp/Grpc.HealthCheck.Tests/Grpc.HealthCheck.Tests.csproj
+++ b/src/csharp/Grpc.HealthCheck.Tests/Grpc.HealthCheck.Tests.csproj
@@ -35,14 +35,14 @@
     <Reference Include="Microsoft.CSharp" />
     <Reference Include="System.Data" />
     <Reference Include="System.Xml" />
+    <Reference Include="Google.Protobuf">
+      <HintPath>..\packages\Google.Protobuf.3.2.0\lib\net45\Google.Protobuf.dll</HintPath>
+    </Reference>
     <Reference Include="nunit.framework">
-      <HintPath>..\packages\NUnit.3.2.0\lib\net45\nunit.framework.dll</HintPath>
+      <HintPath>..\packages\NUnit.3.6.0\lib\net45\nunit.framework.dll</HintPath>
     </Reference>
     <Reference Include="nunitlite">
-      <HintPath>..\packages\NUnitLite.3.2.0\lib\net45\nunitlite.dll</HintPath>
-    </Reference>
-    <Reference Include="Google.Protobuf">
-      <HintPath>..\packages\Google.Protobuf.3.0.0\lib\net45\Google.Protobuf.dll</HintPath>
+      <HintPath>..\packages\NUnitLite.3.6.0\lib\net45\nunitlite.dll</HintPath>
     </Reference>
   </ItemGroup>
   <ItemGroup>
diff --git a/src/csharp/Grpc.HealthCheck.Tests/packages.config b/src/csharp/Grpc.HealthCheck.Tests/packages.config
index e796d6b135..48c94bc4a3 100644
--- a/src/csharp/Grpc.HealthCheck.Tests/packages.config
+++ b/src/csharp/Grpc.HealthCheck.Tests/packages.config
@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="utf-8"?>
 <packages>
-  <package id="Google.Protobuf" version="3.0.0" targetFramework="net45" />
-  <package id="NUnit" version="3.2.0" targetFramework="net45" />
-  <package id="NUnitLite" version="3.2.0" targetFramework="net45" />
+  <package id="Google.Protobuf" version="3.2.0" targetFramework="net45" />
+  <package id="NUnit" version="3.6.0" targetFramework="net45" />
+  <package id="NUnitLite" version="3.6.0" targetFramework="net45" />
 </packages>
\ No newline at end of file
diff --git a/src/csharp/Grpc.HealthCheck.Tests/project.json b/src/csharp/Grpc.HealthCheck.Tests/project.json
index 654454d1cb..2814cbfe46 100644
--- a/src/csharp/Grpc.HealthCheck.Tests/project.json
+++ b/src/csharp/Grpc.HealthCheck.Tests/project.json
@@ -45,8 +45,8 @@
     "Grpc.HealthCheck": {
       "target": "project"
     },
-    "NUnit": "3.2.0",
-    "NUnitLite": "3.2.0-*"
+    "NUnit": "3.6.0",
+    "NUnitLite": "3.6.0"
   },
   "frameworks": {
     "net45": { },
diff --git a/src/csharp/Grpc.HealthCheck/Grpc.HealthCheck.csproj b/src/csharp/Grpc.HealthCheck/Grpc.HealthCheck.csproj
index 63aa18584d..171525b708 100644
--- a/src/csharp/Grpc.HealthCheck/Grpc.HealthCheck.csproj
+++ b/src/csharp/Grpc.HealthCheck/Grpc.HealthCheck.csproj
@@ -36,12 +36,12 @@
     <Reference Include="Microsoft.CSharp" />
     <Reference Include="System.Data" />
     <Reference Include="System.Xml" />
-    <Reference Include="Google.Protobuf">
-      <HintPath>..\packages\Google.Protobuf.3.0.0\lib\net45\Google.Protobuf.dll</HintPath>
-    </Reference>
     <Reference Include="System.Interactive.Async">
       <HintPath>..\packages\System.Interactive.Async.3.1.1\lib\net45\System.Interactive.Async.dll</HintPath>
     </Reference>
+    <Reference Include="Google.Protobuf">
+      <HintPath>..\packages\Google.Protobuf.3.2.0\lib\net45\Google.Protobuf.dll</HintPath>
+    </Reference>
   </ItemGroup>
   <ItemGroup>
     <Compile Include="..\Grpc.Core\Version.cs">
diff --git a/src/csharp/Grpc.HealthCheck/packages.config b/src/csharp/Grpc.HealthCheck/packages.config
index 5ab40b7a8c..eec292b306 100644
--- a/src/csharp/Grpc.HealthCheck/packages.config
+++ b/src/csharp/Grpc.HealthCheck/packages.config
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="utf-8"?>
 <packages>
-  <package id="Google.Protobuf" version="3.0.0" targetFramework="net45" />
+  <package id="Google.Protobuf" version="3.2.0" targetFramework="net45" />
   <package id="System.Interactive.Async" version="3.1.1" targetFramework="net45" />
 </packages>
\ No newline at end of file
diff --git a/src/csharp/Grpc.HealthCheck/project.json b/src/csharp/Grpc.HealthCheck/project.json
index 5d3b2f554b..9e9d245cae 100644
--- a/src/csharp/Grpc.HealthCheck/project.json
+++ b/src/csharp/Grpc.HealthCheck/project.json
@@ -22,15 +22,10 @@
   },
   "dependencies": {
     "Grpc.Core": "1.2.0-dev",
-    "Google.Protobuf": "3.0.0"
+    "Google.Protobuf": "3.2.0"
   },
   "frameworks": {
-    "net45": {
-      "frameworkAssemblies": {
-        "System.Runtime": "",
-        "System.IO": ""
-      }
-    },
+    "net45": {},
     "netstandard1.5": {
       "dependencies": {
         "NETStandard.Library": "1.6.0"
diff --git a/src/csharp/Grpc.IntegrationTesting.Client/Grpc.IntegrationTesting.Client.csproj b/src/csharp/Grpc.IntegrationTesting.Client/Grpc.IntegrationTesting.Client.csproj
index 6bb5f33966..a793f3f6df 100644
--- a/src/csharp/Grpc.IntegrationTesting.Client/Grpc.IntegrationTesting.Client.csproj
+++ b/src/csharp/Grpc.IntegrationTesting.Client/Grpc.IntegrationTesting.Client.csproj
@@ -34,33 +34,6 @@
     <Reference Include="System.Net" />
     <Reference Include="System.Net.Http" />
     <Reference Include="System.Net.Http.WebRequest" />
-    <Reference Include="BouncyCastle.Crypto">
-      <HintPath>..\packages\BouncyCastle.1.7.0\lib\Net40-Client\BouncyCastle.Crypto.dll</HintPath>
-    </Reference>
-    <Reference Include="Newtonsoft.Json">
-      <HintPath>..\packages\Newtonsoft.Json.7.0.1\lib\net45\Newtonsoft.Json.dll</HintPath>
-    </Reference>
-    <Reference Include="log4net">
-      <HintPath>..\packages\log4net.2.0.3\lib\net40-full\log4net.dll</HintPath>
-    </Reference>
-    <Reference Include="Google.Apis.Core">
-      <HintPath>..\packages\Google.Apis.Core.1.16.0\lib\net45\Google.Apis.Core.dll</HintPath>
-    </Reference>
-    <Reference Include="Zlib.Portable">
-      <HintPath>..\packages\Zlib.Portable.Signed.1.11.0\lib\portable-net4+sl5+wp8+win8+wpa81+MonoTouch+MonoAndroid\Zlib.Portable.dll</HintPath>
-    </Reference>
-    <Reference Include="Google.Apis">
-      <HintPath>..\packages\Google.Apis.1.16.0\lib\net45\Google.Apis.dll</HintPath>
-    </Reference>
-    <Reference Include="Google.Apis.PlatformServices">
-      <HintPath>..\packages\Google.Apis.1.16.0\lib\net45\Google.Apis.PlatformServices.dll</HintPath>
-    </Reference>
-    <Reference Include="Google.Apis.Auth">
-      <HintPath>..\packages\Google.Apis.Auth.1.16.0\lib\net45\Google.Apis.Auth.dll</HintPath>
-    </Reference>
-    <Reference Include="Google.Apis.Auth.PlatformServices">
-      <HintPath>..\packages\Google.Apis.Auth.1.16.0\lib\net45\Google.Apis.Auth.PlatformServices.dll</HintPath>
-    </Reference>
   </ItemGroup>
   <ItemGroup>
     <Compile Include="..\Grpc.Core\Version.cs">
@@ -82,6 +55,5 @@
   </ItemGroup>
   <ItemGroup>
     <None Include="Grpc.IntegrationTesting.Client.project.json" />
-    <None Include="packages.config" />
   </ItemGroup>
 </Project>
\ No newline at end of file
diff --git a/src/csharp/Grpc.IntegrationTesting.Client/packages.config b/src/csharp/Grpc.IntegrationTesting.Client/packages.config
deleted file mode 100644
index 11c6375c63..0000000000
--- a/src/csharp/Grpc.IntegrationTesting.Client/packages.config
+++ /dev/null
@@ -1,10 +0,0 @@
-<?xml version="1.0" encoding="utf-8"?>
-<packages>
-  <package id="BouncyCastle" version="1.7.0" targetFramework="net45" />
-  <package id="Google.Apis" version="1.16.0" targetFramework="net45" />
-  <package id="Google.Apis.Auth" version="1.16.0" targetFramework="net45" />
-  <package id="Google.Apis.Core" version="1.16.0" targetFramework="net45" />
-  <package id="log4net" version="2.0.3" targetFramework="net45" />
-  <package id="Newtonsoft.Json" version="7.0.1" targetFramework="net45" />
-  <package id="Zlib.Portable.Signed" version="1.11.0" targetFramework="net45" />
-</packages>
\ No newline at end of file
diff --git a/src/csharp/Grpc.IntegrationTesting.QpsWorker/packages.config b/src/csharp/Grpc.IntegrationTesting.QpsWorker/packages.config
deleted file mode 100644
index 79ece06bef..0000000000
--- a/src/csharp/Grpc.IntegrationTesting.QpsWorker/packages.config
+++ /dev/null
@@ -1,3 +0,0 @@
-<?xml version="1.0" encoding="utf-8"?>
-<packages>
-</packages>
diff --git a/src/csharp/Grpc.IntegrationTesting.Server/Grpc.IntegrationTesting.Server.csproj b/src/csharp/Grpc.IntegrationTesting.Server/Grpc.IntegrationTesting.Server.csproj
index 081dc24fbf..80d36363f7 100644
--- a/src/csharp/Grpc.IntegrationTesting.Server/Grpc.IntegrationTesting.Server.csproj
+++ b/src/csharp/Grpc.IntegrationTesting.Server/Grpc.IntegrationTesting.Server.csproj
@@ -34,33 +34,6 @@
     <Reference Include="System.Net" />
     <Reference Include="System.Net.Http" />
     <Reference Include="System.Net.Http.WebRequest" />
-    <Reference Include="BouncyCastle.Crypto">
-      <HintPath>..\packages\BouncyCastle.1.7.0\lib\Net40-Client\BouncyCastle.Crypto.dll</HintPath>
-    </Reference>
-    <Reference Include="Newtonsoft.Json">
-      <HintPath>..\packages\Newtonsoft.Json.7.0.1\lib\net45\Newtonsoft.Json.dll</HintPath>
-    </Reference>
-    <Reference Include="log4net">
-      <HintPath>..\packages\log4net.2.0.3\lib\net40-full\log4net.dll</HintPath>
-    </Reference>
-    <Reference Include="Google.Apis.Core">
-      <HintPath>..\packages\Google.Apis.Core.1.16.0\lib\net45\Google.Apis.Core.dll</HintPath>
-    </Reference>
-    <Reference Include="Zlib.Portable">
-      <HintPath>..\packages\Zlib.Portable.Signed.1.11.0\lib\portable-net4+sl5+wp8+win8+wpa81+MonoTouch+MonoAndroid\Zlib.Portable.dll</HintPath>
-    </Reference>
-    <Reference Include="Google.Apis">
-      <HintPath>..\packages\Google.Apis.1.16.0\lib\net45\Google.Apis.dll</HintPath>
-    </Reference>
-    <Reference Include="Google.Apis.PlatformServices">
-      <HintPath>..\packages\Google.Apis.1.16.0\lib\net45\Google.Apis.PlatformServices.dll</HintPath>
-    </Reference>
-    <Reference Include="Google.Apis.Auth">
-      <HintPath>..\packages\Google.Apis.Auth.1.16.0\lib\net45\Google.Apis.Auth.dll</HintPath>
-    </Reference>
-    <Reference Include="Google.Apis.Auth.PlatformServices">
-      <HintPath>..\packages\Google.Apis.Auth.1.16.0\lib\net45\Google.Apis.Auth.PlatformServices.dll</HintPath>
-    </Reference>
   </ItemGroup>
   <ItemGroup>
     <Compile Include="..\Grpc.Core\Version.cs">
@@ -82,6 +55,5 @@
   </ItemGroup>
   <ItemGroup>
     <None Include="Grpc.IntegrationTesting.Server.project.json" />
-    <None Include="packages.config" />
   </ItemGroup>
 </Project>
\ No newline at end of file
diff --git a/src/csharp/Grpc.IntegrationTesting.Server/packages.config b/src/csharp/Grpc.IntegrationTesting.Server/packages.config
deleted file mode 100644
index 11c6375c63..0000000000
--- a/src/csharp/Grpc.IntegrationTesting.Server/packages.config
+++ /dev/null
@@ -1,10 +0,0 @@
-<?xml version="1.0" encoding="utf-8"?>
-<packages>
-  <package id="BouncyCastle" version="1.7.0" targetFramework="net45" />
-  <package id="Google.Apis" version="1.16.0" targetFramework="net45" />
-  <package id="Google.Apis.Auth" version="1.16.0" targetFramework="net45" />
-  <package id="Google.Apis.Core" version="1.16.0" targetFramework="net45" />
-  <package id="log4net" version="2.0.3" targetFramework="net45" />
-  <package id="Newtonsoft.Json" version="7.0.1" targetFramework="net45" />
-  <package id="Zlib.Portable.Signed" version="1.11.0" targetFramework="net45" />
-</packages>
\ No newline at end of file
diff --git a/src/csharp/Grpc.IntegrationTesting.StressClient/packages.config b/src/csharp/Grpc.IntegrationTesting.StressClient/packages.config
deleted file mode 100644
index 79ece06bef..0000000000
--- a/src/csharp/Grpc.IntegrationTesting.StressClient/packages.config
+++ /dev/null
@@ -1,3 +0,0 @@
-<?xml version="1.0" encoding="utf-8"?>
-<packages>
-</packages>
diff --git a/src/csharp/Grpc.IntegrationTesting/Control.cs b/src/csharp/Grpc.IntegrationTesting/Control.cs
index 3f4862d567..6c0176fb43 100644
--- a/src/csharp/Grpc.IntegrationTesting/Control.cs
+++ b/src/csharp/Grpc.IntegrationTesting/Control.cs
@@ -30,63 +30,66 @@ namespace Grpc.Testing {
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+            "aW5nLlNjZW5hcmlvUmVzdWx0U3VtbWFyeRIWCg5jbGllbnRfc3VjY2VzcxgH",
+            "IAMoCBIWCg5zZXJ2ZXJfc3VjY2VzcxgIIAMoCBI5Cg9yZXF1ZXN0X3Jlc3Vs",
+            "dHMYCSADKAsyIC5ncnBjLnRlc3RpbmcuUmVxdWVzdFJlc3VsdENvdW50KkEK",
+            "CkNsaWVudFR5cGUSDwoLU1lOQ19DTElFTlQQABIQCgxBU1lOQ19DTElFTlQQ",
+            "ARIQCgxPVEhFUl9DTElFTlQQAipbCgpTZXJ2ZXJUeXBlEg8KC1NZTkNfU0VS",
+            "VkVSEAASEAoMQVNZTkNfU0VSVkVSEAESGAoUQVNZTkNfR0VORVJJQ19TRVJW",
+            "RVIQAhIQCgxPVEhFUl9TRVJWRVIQAyojCgdScGNUeXBlEgkKBVVOQVJZEAAS",
+            "DQoJU1RSRUFNSU5HEAFiBnByb3RvMw=="));
       descriptor = pbr::FileDescriptor.FromGeneratedCode(descriptorData,
           new pbr::FileDescriptor[] { global::Grpc.Testing.PayloadsReflection.Descriptor, global::Grpc.Testing.StatsReflection.Descriptor, },
           new pbr::GeneratedClrTypeInfo(new[] {typeof(global::Grpc.Testing.ClientType), typeof(global::Grpc.Testing.ServerType), typeof(global::Grpc.Testing.RpcType), }, new pbr::GeneratedClrTypeInfo[] {
@@ -94,7 +97,8 @@ namespace Grpc.Testing {
             new pbr::GeneratedClrTypeInfo(typeof(global::Grpc.Testing.ClosedLoopParams), global::Grpc.Testing.ClosedLoopParams.Parser, null, null, null, null),
             new pbr::GeneratedClrTypeInfo(typeof(global::Grpc.Testing.LoadParams), global::Grpc.Testing.LoadParams.Parser, new[]{ "ClosedLoop", "Poisson" }, new[]{ "Load" }, null, null),
             new pbr::GeneratedClrTypeInfo(typeof(global::Grpc.Testing.SecurityParams), global::Grpc.Testing.SecurityParams.Parser, new[]{ "UseTestCa", "ServerHostOverride" }, null, null, null),
-            new pbr::GeneratedClrTypeInfo(typeof(global::Grpc.Testing.ClientConfig), global::Grpc.Testing.ClientConfig.Parser, new[]{ "ServerTargets", "ClientType", "SecurityParams", "OutstandingRpcsPerChannel", "ClientChannels", "AsyncClientThreads", "RpcType", "LoadParams", "PayloadConfig", "HistogramParams", "CoreList", "CoreLimit", "OtherClientApi" }, null, null, null),
+            new pbr::GeneratedClrTypeInfo(typeof(global::Grpc.Testing.ChannelArg), global::Grpc.Testing.ChannelArg.Parser, new[]{ "Name", "StrValue", "IntValue" }, new[]{ "Value" }, null, null),
+            new pbr::GeneratedClrTypeInfo(typeof(global::Grpc.Testing.ClientConfig), global::Grpc.Testing.ClientConfig.Parser, new[]{ "ServerTargets", "ClientType", "SecurityParams", "OutstandingRpcsPerChannel", "ClientChannels", "AsyncClientThreads", "RpcType", "LoadParams", "PayloadConfig", "HistogramParams", "CoreList", "CoreLimit", "OtherClientApi", "ChannelArgs" }, null, null, null),
             new pbr::GeneratedClrTypeInfo(typeof(global::Grpc.Testing.ClientStatus), global::Grpc.Testing.ClientStatus.Parser, new[]{ "Stats" }, null, null, null),
             new pbr::GeneratedClrTypeInfo(typeof(global::Grpc.Testing.Mark), global::Grpc.Testing.Mark.Parser, new[]{ "Reset" }, null, null, null),
             new pbr::GeneratedClrTypeInfo(typeof(global::Grpc.Testing.ClientArgs), global::Grpc.Testing.ClientArgs.Parser, new[]{ "Setup", "Mark" }, new[]{ "Argtype" }, null, null),
@@ -116,13 +120,13 @@ namespace Grpc.Testing {
   #region Enums
   public enum ClientType {
     /// <summary>
-    ///  Many languages support a basic distinction between using
-    ///  sync or async client, and this allows the specification
+    /// Many languages support a basic distinction between using
+    /// sync or async client, and this allows the specification
     /// </summary>
     [pbr::OriginalName("SYNC_CLIENT")] SyncClient = 0,
     [pbr::OriginalName("ASYNC_CLIENT")] AsyncClient = 1,
     /// <summary>
-    ///  used for some language-specific variants
+    /// used for some language-specific variants
     /// </summary>
     [pbr::OriginalName("OTHER_CLIENT")] OtherClient = 2,
   }
@@ -132,7 +136,7 @@ namespace Grpc.Testing {
     [pbr::OriginalName("ASYNC_SERVER")] AsyncServer = 1,
     [pbr::OriginalName("ASYNC_GENERIC_SERVER")] AsyncGenericServer = 2,
     /// <summary>
-    ///  used for some language-specific variants
+    /// used for some language-specific variants
     /// </summary>
     [pbr::OriginalName("OTHER_SERVER")] OtherServer = 3,
   }
@@ -146,8 +150,8 @@ namespace Grpc.Testing {
 
   #region Messages
   /// <summary>
-  ///  Parameters of poisson process distribution, which is a good representation
-  ///  of activity coming in from independent identical stationary sources.
+  /// Parameters of poisson process distribution, which is a good representation
+  /// of activity coming in from independent identical stationary sources.
   /// </summary>
   public sealed partial class PoissonParams : pb::IMessage<PoissonParams> {
     private static readonly pb::MessageParser<PoissonParams> _parser = new pb::MessageParser<PoissonParams>(() => new PoissonParams());
@@ -185,7 +189,7 @@ namespace Grpc.Testing {
     public const int OfferedLoadFieldNumber = 1;
     private double offeredLoad_;
     /// <summary>
-    ///  The rate of arrivals (a.k.a. lambda parameter of the exp distribution).
+    /// The rate of arrivals (a.k.a. lambda parameter of the exp distribution).
     /// </summary>
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public double OfferedLoad {
@@ -270,8 +274,8 @@ namespace Grpc.Testing {
   }
 
   /// <summary>
-  ///  Once an RPC finishes, immediately start a new one.
-  ///  No configuration parameters needed.
+  /// Once an RPC finishes, immediately start a new one.
+  /// No configuration parameters needed.
   /// </summary>
   public sealed partial class ClosedLoopParams : pb::IMessage<ClosedLoopParams> {
     private static readonly pb::MessageParser<ClosedLoopParams> _parser = new pb::MessageParser<ClosedLoopParams>(() => new ClosedLoopParams());
@@ -549,7 +553,7 @@ namespace Grpc.Testing {
   }
 
   /// <summary>
-  ///  presence of SecurityParams implies use of TLS
+  /// presence of SecurityParams implies use of TLS
   /// </summary>
   public sealed partial class SecurityParams : pb::IMessage<SecurityParams> {
     private static readonly pb::MessageParser<SecurityParams> _parser = new pb::MessageParser<SecurityParams>(() => new SecurityParams());
@@ -696,6 +700,210 @@ namespace Grpc.Testing {
 
   }
 
+  public sealed partial class ChannelArg : pb::IMessage<ChannelArg> {
+    private static readonly pb::MessageParser<ChannelArg> _parser = new pb::MessageParser<ChannelArg>(() => new ChannelArg());
+    [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
+    public static pb::MessageParser<ChannelArg> Parser { get { return _parser; } }
+
+    [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
+    public static pbr::MessageDescriptor Descriptor {
+      get { return global::Grpc.Testing.ControlReflection.Descriptor.MessageTypes[4]; }
+    }
+
+    [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
+    pbr::MessageDescriptor pb::IMessage.Descriptor {
+      get { return Descriptor; }
+    }
+
+    [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
+    public ChannelArg() {
+      OnConstruction();
+    }
+
+    partial void OnConstruction();
+
+    [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
+    public ChannelArg(ChannelArg other) : this() {
+      name_ = other.name_;
+      switch (other.ValueCase) {
+        case ValueOneofCase.StrValue:
+          StrValue = other.StrValue;
+          break;
+        case ValueOneofCase.IntValue:
+          IntValue = other.IntValue;
+          break;
+      }
+
+    }
+
+    [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
+    public ChannelArg Clone() {
+      return new ChannelArg(this);
+    }
+
+    /// <summary>Field number for the "name" field.</summary>
+    public const int NameFieldNumber = 1;
+    private string name_ = "";
+    [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
+    public string Name {
+      get { return name_; }
+      set {
+        name_ = pb::ProtoPreconditions.CheckNotNull(value, "value");
+      }
+    }
+
+    /// <summary>Field number for the "str_value" field.</summary>
+    public const int StrValueFieldNumber = 2;
+    [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
+    public string StrValue {
+      get { return valueCase_ == ValueOneofCase.StrValue ? (string) value_ : ""; }
+      set {
+        value_ = pb::ProtoPreconditions.CheckNotNull(value, "value");
+        valueCase_ = ValueOneofCase.StrValue;
+      }
+    }
+
+    /// <summary>Field number for the "int_value" field.</summary>
+    public const int IntValueFieldNumber = 3;
+    [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
+    public int IntValue {
+      get { return valueCase_ == ValueOneofCase.IntValue ? (int) value_ : 0; }
+      set {
+        value_ = value;
+        valueCase_ = ValueOneofCase.IntValue;
+      }
+    }
+
+    private object value_;
+    /// <summary>Enum of possible cases for the "value" oneof.</summary>
+    public enum ValueOneofCase {
+      None = 0,
+      StrValue = 2,
+      IntValue = 3,
+    }
+    private ValueOneofCase valueCase_ = ValueOneofCase.None;
+    [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
+    public ValueOneofCase ValueCase {
+      get { return valueCase_; }
+    }
+
+    [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
+    public void ClearValue() {
+      valueCase_ = ValueOneofCase.None;
+      value_ = null;
+    }
+
+    [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
+    public override bool Equals(object other) {
+      return Equals(other as ChannelArg);
+    }
+
+    [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
+    public bool Equals(ChannelArg other) {
+      if (ReferenceEquals(other, null)) {
+        return false;
+      }
+      if (ReferenceEquals(other, this)) {
+        return true;
+      }
+      if (Name != other.Name) return false;
+      if (StrValue != other.StrValue) return false;
+      if (IntValue != other.IntValue) return false;
+      if (ValueCase != other.ValueCase) return false;
+      return true;
+    }
+
+    [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
+    public override int GetHashCode() {
+      int hash = 1;
+      if (Name.Length != 0) hash ^= Name.GetHashCode();
+      if (valueCase_ == ValueOneofCase.StrValue) hash ^= StrValue.GetHashCode();
+      if (valueCase_ == ValueOneofCase.IntValue) hash ^= IntValue.GetHashCode();
+      hash ^= (int) valueCase_;
+      return hash;
+    }
+
+    [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
+    public override string ToString() {
+      return pb::JsonFormatter.ToDiagnosticString(this);
+    }
+
+    [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
+    public void WriteTo(pb::CodedOutputStream output) {
+      if (Name.Length != 0) {
+        output.WriteRawTag(10);
+        output.WriteString(Name);
+      }
+      if (valueCase_ == ValueOneofCase.StrValue) {
+        output.WriteRawTag(18);
+        output.WriteString(StrValue);
+      }
+      if (valueCase_ == ValueOneofCase.IntValue) {
+        output.WriteRawTag(24);
+        output.WriteInt32(IntValue);
+      }
+    }
+
+    [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
+    public int CalculateSize() {
+      int size = 0;
+      if (Name.Length != 0) {
+        size += 1 + pb::CodedOutputStream.ComputeStringSize(Name);
+      }
+      if (valueCase_ == ValueOneofCase.StrValue) {
+        size += 1 + pb::CodedOutputStream.ComputeStringSize(StrValue);
+      }
+      if (valueCase_ == ValueOneofCase.IntValue) {
+        size += 1 + pb::CodedOutputStream.ComputeInt32Size(IntValue);
+      }
+      return size;
+    }
+
+    [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
+    public void MergeFrom(ChannelArg other) {
+      if (other == null) {
+        return;
+      }
+      if (other.Name.Length != 0) {
+        Name = other.Name;
+      }
+      switch (other.ValueCase) {
+        case ValueOneofCase.StrValue:
+          StrValue = other.StrValue;
+          break;
+        case ValueOneofCase.IntValue:
+          IntValue = other.IntValue;
+          break;
+      }
+
+    }
+
+    [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
+    public void MergeFrom(pb::CodedInputStream input) {
+      uint tag;
+      while ((tag = input.ReadTag()) != 0) {
+        switch(tag) {
+          default:
+            input.SkipLastField();
+            break;
+          case 10: {
+            Name = input.ReadString();
+            break;
+          }
+          case 18: {
+            StrValue = input.ReadString();
+            break;
+          }
+          case 24: {
+            IntValue = input.ReadInt32();
+            break;
+          }
+        }
+      }
+    }
+
+  }
+
   public sealed partial class ClientConfig : pb::IMessage<ClientConfig> {
     private static readonly pb::MessageParser<ClientConfig> _parser = new pb::MessageParser<ClientConfig>(() => new ClientConfig());
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -703,7 +911,7 @@ namespace Grpc.Testing {
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public static pbr::MessageDescriptor Descriptor {
-      get { return global::Grpc.Testing.ControlReflection.Descriptor.MessageTypes[4]; }
+      get { return global::Grpc.Testing.ControlReflection.Descriptor.MessageTypes[5]; }
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -733,6 +941,7 @@ namespace Grpc.Testing {
       coreList_ = other.coreList_.Clone();
       coreLimit_ = other.coreLimit_;
       otherClientApi_ = other.otherClientApi_;
+      channelArgs_ = other.channelArgs_.Clone();
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -746,7 +955,7 @@ namespace Grpc.Testing {
         = pb::FieldCodec.ForString(10);
     private readonly pbc::RepeatedField<string> serverTargets_ = new pbc::RepeatedField<string>();
     /// <summary>
-    ///  List of targets to connect to. At least one target needs to be specified.
+    /// List of targets to connect to. At least one target needs to be specified.
     /// </summary>
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public pbc::RepeatedField<string> ServerTargets {
@@ -779,8 +988,8 @@ namespace Grpc.Testing {
     public const int OutstandingRpcsPerChannelFieldNumber = 4;
     private int outstandingRpcsPerChannel_;
     /// <summary>
-    ///  How many concurrent RPCs to start for each channel.
-    ///  For synchronous client, use a separate thread for each outstanding RPC.
+    /// How many concurrent RPCs to start for each channel.
+    /// For synchronous client, use a separate thread for each outstanding RPC.
     /// </summary>
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public int OutstandingRpcsPerChannel {
@@ -794,8 +1003,8 @@ namespace Grpc.Testing {
     public const int ClientChannelsFieldNumber = 5;
     private int clientChannels_;
     /// <summary>
-    ///  Number of independent client channels to create.
-    ///  i-th channel will connect to server_target[i % server_targets.size()]
+    /// Number of independent client channels to create.
+    /// i-th channel will connect to server_target[i % server_targets.size()]
     /// </summary>
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public int ClientChannels {
@@ -809,7 +1018,7 @@ namespace Grpc.Testing {
     public const int AsyncClientThreadsFieldNumber = 7;
     private int asyncClientThreads_;
     /// <summary>
-    ///  Only for async client. Number of threads to use to start/manage RPCs.
+    /// Only for async client. Number of threads to use to start/manage RPCs.
     /// </summary>
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public int AsyncClientThreads {
@@ -834,7 +1043,7 @@ namespace Grpc.Testing {
     public const int LoadParamsFieldNumber = 10;
     private global::Grpc.Testing.LoadParams loadParams_;
     /// <summary>
-    ///  The requested load for the entire client (aggregated over all the threads).
+    /// The requested load for the entire client (aggregated over all the threads).
     /// </summary>
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public global::Grpc.Testing.LoadParams LoadParams {
@@ -872,7 +1081,7 @@ namespace Grpc.Testing {
         = pb::FieldCodec.ForInt32(106);
     private readonly pbc::RepeatedField<int> coreList_ = new pbc::RepeatedField<int>();
     /// <summary>
-    ///  Specify the cores we should run the client on, if desired
+    /// Specify the cores we should run the client on, if desired
     /// </summary>
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public pbc::RepeatedField<int> CoreList {
@@ -894,7 +1103,7 @@ namespace Grpc.Testing {
     public const int OtherClientApiFieldNumber = 15;
     private string otherClientApi_ = "";
     /// <summary>
-    ///  If we use an OTHER_CLIENT client_type, this string gives more detail
+    /// If we use an OTHER_CLIENT client_type, this string gives more detail
     /// </summary>
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public string OtherClientApi {
@@ -904,6 +1113,16 @@ namespace Grpc.Testing {
       }
     }
 
+    /// <summary>Field number for the "channel_args" field.</summary>
+    public const int ChannelArgsFieldNumber = 16;
+    private static readonly pb::FieldCodec<global::Grpc.Testing.ChannelArg> _repeated_channelArgs_codec
+        = pb::FieldCodec.ForMessage(130, global::Grpc.Testing.ChannelArg.Parser);
+    private readonly pbc::RepeatedField<global::Grpc.Testing.ChannelArg> channelArgs_ = new pbc::RepeatedField<global::Grpc.Testing.ChannelArg>();
+    [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
+    public pbc::RepeatedField<global::Grpc.Testing.ChannelArg> ChannelArgs {
+      get { return channelArgs_; }
+    }
+
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public override bool Equals(object other) {
       return Equals(other as ClientConfig);
@@ -930,6 +1149,7 @@ namespace Grpc.Testing {
       if(!coreList_.Equals(other.coreList_)) return false;
       if (CoreLimit != other.CoreLimit) return false;
       if (OtherClientApi != other.OtherClientApi) return false;
+      if(!channelArgs_.Equals(other.channelArgs_)) return false;
       return true;
     }
 
@@ -949,6 +1169,7 @@ namespace Grpc.Testing {
       hash ^= coreList_.GetHashCode();
       if (CoreLimit != 0) hash ^= CoreLimit.GetHashCode();
       if (OtherClientApi.Length != 0) hash ^= OtherClientApi.GetHashCode();
+      hash ^= channelArgs_.GetHashCode();
       return hash;
     }
 
@@ -1005,6 +1226,7 @@ namespace Grpc.Testing {
         output.WriteRawTag(122);
         output.WriteString(OtherClientApi);
       }
+      channelArgs_.WriteTo(output, _repeated_channelArgs_codec);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -1045,6 +1267,7 @@ namespace Grpc.Testing {
       if (OtherClientApi.Length != 0) {
         size += 1 + pb::CodedOutputStream.ComputeStringSize(OtherClientApi);
       }
+      size += channelArgs_.CalculateSize(_repeated_channelArgs_codec);
       return size;
     }
 
@@ -1100,6 +1323,7 @@ namespace Grpc.Testing {
       if (other.OtherClientApi.Length != 0) {
         OtherClientApi = other.OtherClientApi;
       }
+      channelArgs_.Add(other.channelArgs_);
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -1175,6 +1399,10 @@ namespace Grpc.Testing {
             OtherClientApi = input.ReadString();
             break;
           }
+          case 130: {
+            channelArgs_.AddEntriesFrom(input, _repeated_channelArgs_codec);
+            break;
+          }
         }
       }
     }
@@ -1188,7 +1416,7 @@ namespace Grpc.Testing {
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public static pbr::MessageDescriptor Descriptor {
-      get { return global::Grpc.Testing.ControlReflection.Descriptor.MessageTypes[5]; }
+      get { return global::Grpc.Testing.ControlReflection.Descriptor.MessageTypes[6]; }
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -1305,7 +1533,7 @@ namespace Grpc.Testing {
   }
 
   /// <summary>
-  ///  Request current stats
+  /// Request current stats
   /// </summary>
   public sealed partial class Mark : pb::IMessage<Mark> {
     private static readonly pb::MessageParser<Mark> _parser = new pb::MessageParser<Mark>(() => new Mark());
@@ -1314,7 +1542,7 @@ namespace Grpc.Testing {
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public static pbr::MessageDescriptor Descriptor {
-      get { return global::Grpc.Testing.ControlReflection.Descriptor.MessageTypes[6]; }
+      get { return global::Grpc.Testing.ControlReflection.Descriptor.MessageTypes[7]; }
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -1343,7 +1571,7 @@ namespace Grpc.Testing {
     public const int ResetFieldNumber = 1;
     private bool reset_;
     /// <summary>
-    ///  if true, the stats will be reset after taking their snapshot.
+    /// if true, the stats will be reset after taking their snapshot.
     /// </summary>
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public bool Reset {
@@ -1434,7 +1662,7 @@ namespace Grpc.Testing {
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public static pbr::MessageDescriptor Descriptor {
-      get { return global::Grpc.Testing.ControlReflection.Descriptor.MessageTypes[7]; }
+      get { return global::Grpc.Testing.ControlReflection.Descriptor.MessageTypes[8]; }
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -1620,7 +1848,7 @@ namespace Grpc.Testing {
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public static pbr::MessageDescriptor Descriptor {
-      get { return global::Grpc.Testing.ControlReflection.Descriptor.MessageTypes[8]; }
+      get { return global::Grpc.Testing.ControlReflection.Descriptor.MessageTypes[9]; }
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -1679,7 +1907,7 @@ namespace Grpc.Testing {
     public const int PortFieldNumber = 4;
     private int port_;
     /// <summary>
-    ///  Port on which to listen. Zero means pick unused port.
+    /// Port on which to listen. Zero means pick unused port.
     /// </summary>
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public int Port {
@@ -1693,7 +1921,7 @@ namespace Grpc.Testing {
     public const int AsyncServerThreadsFieldNumber = 7;
     private int asyncServerThreads_;
     /// <summary>
-    ///  Only for async server. Number of threads used to serve the requests.
+    /// Only for async server. Number of threads used to serve the requests.
     /// </summary>
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public int AsyncServerThreads {
@@ -1707,7 +1935,7 @@ namespace Grpc.Testing {
     public const int CoreLimitFieldNumber = 8;
     private int coreLimit_;
     /// <summary>
-    ///  Specify the number of cores to limit server to, if desired
+    /// Specify the number of cores to limit server to, if desired
     /// </summary>
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public int CoreLimit {
@@ -1721,7 +1949,10 @@ namespace Grpc.Testing {
     public const int PayloadConfigFieldNumber = 9;
     private global::Grpc.Testing.PayloadConfig payloadConfig_;
     /// <summary>
-    ///  payload config, used in generic server
+    /// payload config, used in generic server.
+    /// Note this must NOT be used in proto (non-generic) servers. For proto servers,
+    /// 'response sizes' must be configured from the 'response_size' field of the
+    /// 'SimpleRequest' objects in RPC requests.
     /// </summary>
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public global::Grpc.Testing.PayloadConfig PayloadConfig {
@@ -1737,7 +1968,7 @@ namespace Grpc.Testing {
         = pb::FieldCodec.ForInt32(82);
     private readonly pbc::RepeatedField<int> coreList_ = new pbc::RepeatedField<int>();
     /// <summary>
-    ///  Specify the cores we should run the server on, if desired
+    /// Specify the cores we should run the server on, if desired
     /// </summary>
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public pbc::RepeatedField<int> CoreList {
@@ -1748,7 +1979,7 @@ namespace Grpc.Testing {
     public const int OtherServerApiFieldNumber = 11;
     private string otherServerApi_ = "";
     /// <summary>
-    ///  If we use an OTHER_SERVER client_type, this string gives more detail
+    /// If we use an OTHER_SERVER client_type, this string gives more detail
     /// </summary>
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public string OtherServerApi {
@@ -1762,7 +1993,7 @@ namespace Grpc.Testing {
     public const int ResourceQuotaSizeFieldNumber = 1001;
     private int resourceQuotaSize_;
     /// <summary>
-    ///  Buffer pool size (no buffer pool specified if unset)
+    /// Buffer pool size (no buffer pool specified if unset)
     /// </summary>
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public int ResourceQuotaSize {
@@ -1987,7 +2218,7 @@ namespace Grpc.Testing {
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public static pbr::MessageDescriptor Descriptor {
-      get { return global::Grpc.Testing.ControlReflection.Descriptor.MessageTypes[9]; }
+      get { return global::Grpc.Testing.ControlReflection.Descriptor.MessageTypes[10]; }
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -2173,7 +2404,7 @@ namespace Grpc.Testing {
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public static pbr::MessageDescriptor Descriptor {
-      get { return global::Grpc.Testing.ControlReflection.Descriptor.MessageTypes[10]; }
+      get { return global::Grpc.Testing.ControlReflection.Descriptor.MessageTypes[11]; }
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -2215,7 +2446,7 @@ namespace Grpc.Testing {
     public const int PortFieldNumber = 2;
     private int port_;
     /// <summary>
-    ///  the port bound by the server
+    /// the port bound by the server
     /// </summary>
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public int Port {
@@ -2229,7 +2460,7 @@ namespace Grpc.Testing {
     public const int CoresFieldNumber = 3;
     private int cores_;
     /// <summary>
-    ///  Number of cores available to the server
+    /// Number of cores available to the server
     /// </summary>
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public int Cores {
@@ -2358,7 +2589,7 @@ namespace Grpc.Testing {
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public static pbr::MessageDescriptor Descriptor {
-      get { return global::Grpc.Testing.ControlReflection.Descriptor.MessageTypes[11]; }
+      get { return global::Grpc.Testing.ControlReflection.Descriptor.MessageTypes[12]; }
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -2447,7 +2678,7 @@ namespace Grpc.Testing {
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public static pbr::MessageDescriptor Descriptor {
-      get { return global::Grpc.Testing.ControlReflection.Descriptor.MessageTypes[12]; }
+      get { return global::Grpc.Testing.ControlReflection.Descriptor.MessageTypes[13]; }
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -2476,7 +2707,7 @@ namespace Grpc.Testing {
     public const int CoresFieldNumber = 1;
     private int cores_;
     /// <summary>
-    ///  Number of cores available on the server
+    /// Number of cores available on the server
     /// </summary>
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public int Cores {
@@ -2567,7 +2798,7 @@ namespace Grpc.Testing {
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public static pbr::MessageDescriptor Descriptor {
-      get { return global::Grpc.Testing.ControlReflection.Descriptor.MessageTypes[13]; }
+      get { return global::Grpc.Testing.ControlReflection.Descriptor.MessageTypes[14]; }
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -2650,7 +2881,7 @@ namespace Grpc.Testing {
   }
 
   /// <summary>
-  ///  A single performance scenario: input to qps_json_driver
+  /// A single performance scenario: input to qps_json_driver
   /// </summary>
   public sealed partial class Scenario : pb::IMessage<Scenario> {
     private static readonly pb::MessageParser<Scenario> _parser = new pb::MessageParser<Scenario>(() => new Scenario());
@@ -2659,7 +2890,7 @@ namespace Grpc.Testing {
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public static pbr::MessageDescriptor Descriptor {
-      get { return global::Grpc.Testing.ControlReflection.Descriptor.MessageTypes[14]; }
+      get { return global::Grpc.Testing.ControlReflection.Descriptor.MessageTypes[15]; }
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -2695,7 +2926,7 @@ namespace Grpc.Testing {
     public const int NameFieldNumber = 1;
     private string name_ = "";
     /// <summary>
-    ///  Human readable name for this scenario
+    /// Human readable name for this scenario
     /// </summary>
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public string Name {
@@ -2709,7 +2940,7 @@ namespace Grpc.Testing {
     public const int ClientConfigFieldNumber = 2;
     private global::Grpc.Testing.ClientConfig clientConfig_;
     /// <summary>
-    ///  Client configuration
+    /// Client configuration
     /// </summary>
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public global::Grpc.Testing.ClientConfig ClientConfig {
@@ -2723,7 +2954,7 @@ namespace Grpc.Testing {
     public const int NumClientsFieldNumber = 3;
     private int numClients_;
     /// <summary>
-    ///  Number of clients to start for the test
+    /// Number of clients to start for the test
     /// </summary>
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public int NumClients {
@@ -2737,7 +2968,7 @@ namespace Grpc.Testing {
     public const int ServerConfigFieldNumber = 4;
     private global::Grpc.Testing.ServerConfig serverConfig_;
     /// <summary>
-    ///  Server configuration
+    /// Server configuration
     /// </summary>
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public global::Grpc.Testing.ServerConfig ServerConfig {
@@ -2751,7 +2982,7 @@ namespace Grpc.Testing {
     public const int NumServersFieldNumber = 5;
     private int numServers_;
     /// <summary>
-    ///  Number of servers to start for the test
+    /// Number of servers to start for the test
     /// </summary>
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public int NumServers {
@@ -2765,7 +2996,7 @@ namespace Grpc.Testing {
     public const int WarmupSecondsFieldNumber = 6;
     private int warmupSeconds_;
     /// <summary>
-    ///  Warmup period, in seconds
+    /// Warmup period, in seconds
     /// </summary>
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public int WarmupSeconds {
@@ -2779,7 +3010,7 @@ namespace Grpc.Testing {
     public const int BenchmarkSecondsFieldNumber = 7;
     private int benchmarkSeconds_;
     /// <summary>
-    ///  Benchmark time, in seconds
+    /// Benchmark time, in seconds
     /// </summary>
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public int BenchmarkSeconds {
@@ -2793,7 +3024,7 @@ namespace Grpc.Testing {
     public const int SpawnLocalWorkerCountFieldNumber = 8;
     private int spawnLocalWorkerCount_;
     /// <summary>
-    ///  Number of workers to spawn locally (usually zero)
+    /// Number of workers to spawn locally (usually zero)
     /// </summary>
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public int SpawnLocalWorkerCount {
@@ -3002,7 +3233,7 @@ namespace Grpc.Testing {
   }
 
   /// <summary>
-  ///  A set of scenarios to be run with qps_json_driver
+  /// A set of scenarios to be run with qps_json_driver
   /// </summary>
   public sealed partial class Scenarios : pb::IMessage<Scenarios> {
     private static readonly pb::MessageParser<Scenarios> _parser = new pb::MessageParser<Scenarios>(() => new Scenarios());
@@ -3011,7 +3242,7 @@ namespace Grpc.Testing {
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public static pbr::MessageDescriptor Descriptor {
-      get { return global::Grpc.Testing.ControlReflection.Descriptor.MessageTypes[15]; }
+      get { return global::Grpc.Testing.ControlReflection.Descriptor.MessageTypes[16]; }
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -3114,8 +3345,8 @@ namespace Grpc.Testing {
   }
 
   /// <summary>
-  ///  Basic summary that can be computed from ClientStats and ServerStats
-  ///  once the scenario has finished.
+  /// Basic summary that can be computed from ClientStats and ServerStats
+  /// once the scenario has finished.
   /// </summary>
   public sealed partial class ScenarioResultSummary : pb::IMessage<ScenarioResultSummary> {
     private static readonly pb::MessageParser<ScenarioResultSummary> _parser = new pb::MessageParser<ScenarioResultSummary>(() => new ScenarioResultSummary());
@@ -3124,7 +3355,7 @@ namespace Grpc.Testing {
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public static pbr::MessageDescriptor Descriptor {
-      get { return global::Grpc.Testing.ControlReflection.Descriptor.MessageTypes[16]; }
+      get { return global::Grpc.Testing.ControlReflection.Descriptor.MessageTypes[17]; }
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -3166,7 +3397,7 @@ namespace Grpc.Testing {
     public const int QpsFieldNumber = 1;
     private double qps_;
     /// <summary>
-    ///  Total number of operations per second over all clients.
+    /// Total number of operations per second over all clients.
     /// </summary>
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public double Qps {
@@ -3180,7 +3411,7 @@ namespace Grpc.Testing {
     public const int QpsPerServerCoreFieldNumber = 2;
     private double qpsPerServerCore_;
     /// <summary>
-    ///  QPS per one server core.
+    /// QPS per one server core.
     /// </summary>
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public double QpsPerServerCore {
@@ -3194,7 +3425,7 @@ namespace Grpc.Testing {
     public const int ServerSystemTimeFieldNumber = 3;
     private double serverSystemTime_;
     /// <summary>
-    ///  server load based on system_time (0.85 => 85%)
+    /// server load based on system_time (0.85 => 85%)
     /// </summary>
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public double ServerSystemTime {
@@ -3208,7 +3439,7 @@ namespace Grpc.Testing {
     public const int ServerUserTimeFieldNumber = 4;
     private double serverUserTime_;
     /// <summary>
-    ///  server load based on user_time (0.85 => 85%)
+    /// server load based on user_time (0.85 => 85%)
     /// </summary>
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public double ServerUserTime {
@@ -3222,7 +3453,7 @@ namespace Grpc.Testing {
     public const int ClientSystemTimeFieldNumber = 5;
     private double clientSystemTime_;
     /// <summary>
-    ///  client load based on system_time (0.85 => 85%)
+    /// client load based on system_time (0.85 => 85%)
     /// </summary>
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public double ClientSystemTime {
@@ -3236,7 +3467,7 @@ namespace Grpc.Testing {
     public const int ClientUserTimeFieldNumber = 6;
     private double clientUserTime_;
     /// <summary>
-    ///  client load based on user_time (0.85 => 85%)
+    /// client load based on user_time (0.85 => 85%)
     /// </summary>
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public double ClientUserTime {
@@ -3250,7 +3481,7 @@ namespace Grpc.Testing {
     public const int Latency50FieldNumber = 7;
     private double latency50_;
     /// <summary>
-    ///  X% latency percentiles (in nanoseconds)
+    /// X% latency percentiles (in nanoseconds)
     /// </summary>
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public double Latency50 {
@@ -3308,7 +3539,7 @@ namespace Grpc.Testing {
     public const int ServerCpuUsageFieldNumber = 12;
     private double serverCpuUsage_;
     /// <summary>
-    ///  server cpu usage percentage
+    /// server cpu usage percentage
     /// </summary>
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public double ServerCpuUsage {
@@ -3322,7 +3553,7 @@ namespace Grpc.Testing {
     public const int SuccessfulRequestsPerSecondFieldNumber = 13;
     private double successfulRequestsPerSecond_;
     /// <summary>
-    ///  Number of requests that succeeded/failed
+    /// Number of requests that succeeded/failed
     /// </summary>
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public double SuccessfulRequestsPerSecond {
@@ -3626,7 +3857,7 @@ namespace Grpc.Testing {
   }
 
   /// <summary>
-  ///  Results of a single benchmark scenario.
+  /// Results of a single benchmark scenario.
   /// </summary>
   public sealed partial class ScenarioResult : pb::IMessage<ScenarioResult> {
     private static readonly pb::MessageParser<ScenarioResult> _parser = new pb::MessageParser<ScenarioResult>(() => new ScenarioResult());
@@ -3635,7 +3866,7 @@ namespace Grpc.Testing {
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public static pbr::MessageDescriptor Descriptor {
-      get { return global::Grpc.Testing.ControlReflection.Descriptor.MessageTypes[17]; }
+      get { return global::Grpc.Testing.ControlReflection.Descriptor.MessageTypes[18]; }
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -3672,7 +3903,7 @@ namespace Grpc.Testing {
     public const int ScenarioFieldNumber = 1;
     private global::Grpc.Testing.Scenario scenario_;
     /// <summary>
-    ///  Inputs used to run the scenario.
+    /// Inputs used to run the scenario.
     /// </summary>
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public global::Grpc.Testing.Scenario Scenario {
@@ -3686,7 +3917,7 @@ namespace Grpc.Testing {
     public const int LatenciesFieldNumber = 2;
     private global::Grpc.Testing.HistogramData latencies_;
     /// <summary>
-    ///  Histograms from all clients merged into one histogram.
+    /// Histograms from all clients merged into one histogram.
     /// </summary>
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public global::Grpc.Testing.HistogramData Latencies {
@@ -3702,7 +3933,7 @@ namespace Grpc.Testing {
         = pb::FieldCodec.ForMessage(26, global::Grpc.Testing.ClientStats.Parser);
     private readonly pbc::RepeatedField<global::Grpc.Testing.ClientStats> clientStats_ = new pbc::RepeatedField<global::Grpc.Testing.ClientStats>();
     /// <summary>
-    ///  Client stats for each client
+    /// Client stats for each client
     /// </summary>
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public pbc::RepeatedField<global::Grpc.Testing.ClientStats> ClientStats {
@@ -3715,7 +3946,7 @@ namespace Grpc.Testing {
         = pb::FieldCodec.ForMessage(34, global::Grpc.Testing.ServerStats.Parser);
     private readonly pbc::RepeatedField<global::Grpc.Testing.ServerStats> serverStats_ = new pbc::RepeatedField<global::Grpc.Testing.ServerStats>();
     /// <summary>
-    ///  Server stats for each server
+    /// Server stats for each server
     /// </summary>
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public pbc::RepeatedField<global::Grpc.Testing.ServerStats> ServerStats {
@@ -3728,7 +3959,7 @@ namespace Grpc.Testing {
         = pb::FieldCodec.ForInt32(42);
     private readonly pbc::RepeatedField<int> serverCores_ = new pbc::RepeatedField<int>();
     /// <summary>
-    ///  Number of cores available to each server
+    /// Number of cores available to each server
     /// </summary>
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public pbc::RepeatedField<int> ServerCores {
@@ -3739,7 +3970,7 @@ namespace Grpc.Testing {
     public const int SummaryFieldNumber = 6;
     private global::Grpc.Testing.ScenarioResultSummary summary_;
     /// <summary>
-    ///  An after-the-fact computed summary
+    /// An after-the-fact computed summary
     /// </summary>
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public global::Grpc.Testing.ScenarioResultSummary Summary {
@@ -3755,7 +3986,7 @@ namespace Grpc.Testing {
         = pb::FieldCodec.ForBool(58);
     private readonly pbc::RepeatedField<bool> clientSuccess_ = new pbc::RepeatedField<bool>();
     /// <summary>
-    ///  Information on success or failure of each worker
+    /// Information on success or failure of each worker
     /// </summary>
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public pbc::RepeatedField<bool> ClientSuccess {
@@ -3778,7 +4009,7 @@ namespace Grpc.Testing {
         = pb::FieldCodec.ForMessage(74, global::Grpc.Testing.RequestResultCount.Parser);
     private readonly pbc::RepeatedField<global::Grpc.Testing.RequestResultCount> requestResults_ = new pbc::RepeatedField<global::Grpc.Testing.RequestResultCount>();
     /// <summary>
-    ///  Number of failed requests (one row per status code seen)
+    /// Number of failed requests (one row per status code seen)
     /// </summary>
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public pbc::RepeatedField<global::Grpc.Testing.RequestResultCount> RequestResults {
diff --git a/src/csharp/Grpc.IntegrationTesting/Empty.cs b/src/csharp/Grpc.IntegrationTesting/Empty.cs
index 3017e664b9..24ffd61741 100644
--- a/src/csharp/Grpc.IntegrationTesting/Empty.cs
+++ b/src/csharp/Grpc.IntegrationTesting/Empty.cs
@@ -35,13 +35,13 @@ namespace Grpc.Testing {
   }
   #region Messages
   /// <summary>
-  ///  An empty message that you can re-use to avoid defining duplicated empty
-  ///  messages in your project. A typical example is to use it as argument or the
-  ///  return value of a service API. For instance:
+  /// An empty message that you can re-use to avoid defining duplicated empty
+  /// messages in your project. A typical example is to use it as argument or the
+  /// return value of a service API. For instance:
   ///
-  ///    service Foo {
-  ///      rpc Bar (grpc.testing.Empty) returns (grpc.testing.Empty) { };
-  ///    };
+  ///   service Foo {
+  ///     rpc Bar (grpc.testing.Empty) returns (grpc.testing.Empty) { };
+  ///   };
   /// </summary>
   public sealed partial class Empty : pb::IMessage<Empty> {
     private static readonly pb::MessageParser<Empty> _parser = new pb::MessageParser<Empty>(() => new Empty());
diff --git a/src/csharp/Grpc.IntegrationTesting/Grpc.IntegrationTesting.csproj b/src/csharp/Grpc.IntegrationTesting/Grpc.IntegrationTesting.csproj
index f7abcf8046..38b9a5d3c5 100644
--- a/src/csharp/Grpc.IntegrationTesting/Grpc.IntegrationTesting.csproj
+++ b/src/csharp/Grpc.IntegrationTesting/Grpc.IntegrationTesting.csproj
@@ -33,53 +33,47 @@
     <Reference Include="System.Net" />
     <Reference Include="System.Net.Http" />
     <Reference Include="System.Net.Http.WebRequest" />
-    <Reference Include="BouncyCastle.Crypto">
-      <HintPath>..\packages\BouncyCastle.1.7.0\lib\Net40-Client\BouncyCastle.Crypto.dll</HintPath>
-    </Reference>
-    <Reference Include="Newtonsoft.Json">
-      <HintPath>..\packages\Newtonsoft.Json.7.0.1\lib\net45\Newtonsoft.Json.dll</HintPath>
-    </Reference>
-    <Reference Include="nunit.framework">
-      <HintPath>..\packages\NUnit.3.2.0\lib\net45\nunit.framework.dll</HintPath>
-    </Reference>
-    <Reference Include="nunitlite">
-      <HintPath>..\packages\NUnitLite.3.2.0\lib\net45\nunitlite.dll</HintPath>
-    </Reference>
-    <Reference Include="CommandLineParser.Unofficial">
-      <HintPath>..\packages\CommandLineParser.Unofficial.2.0.275\lib\net45\CommandLineParser.Unofficial.dll</HintPath>
+    <Reference Include="Zlib.Portable">
+      <HintPath>..\packages\Zlib.Portable.Signed.1.11.0\lib\portable-net4+sl5+wp8+win8+wpa81+MonoTouch+MonoAndroid\Zlib.Portable.dll</HintPath>
     </Reference>
-    <Reference Include="log4net">
-      <HintPath>..\packages\log4net.2.0.3\lib\net40-full\log4net.dll</HintPath>
+    <Reference Include="System.Interactive.Async">
+      <HintPath>..\packages\System.Interactive.Async.3.1.1\lib\net45\System.Interactive.Async.dll</HintPath>
     </Reference>
     <Reference Include="Google.Apis.Core">
-      <HintPath>..\packages\Google.Apis.Core.1.16.0\lib\net45\Google.Apis.Core.dll</HintPath>
-    </Reference>
-    <Reference Include="Zlib.Portable">
-      <HintPath>..\packages\Zlib.Portable.Signed.1.11.0\lib\portable-net4+sl5+wp8+win8+wpa81+MonoTouch+MonoAndroid\Zlib.Portable.dll</HintPath>
+      <HintPath>..\packages\Google.Apis.Core.1.21.0\lib\net45\Google.Apis.Core.dll</HintPath>
     </Reference>
     <Reference Include="Google.Apis">
-      <HintPath>..\packages\Google.Apis.1.16.0\lib\net45\Google.Apis.dll</HintPath>
+      <HintPath>..\packages\Google.Apis.1.21.0\lib\net45\Google.Apis.dll</HintPath>
     </Reference>
     <Reference Include="Google.Apis.PlatformServices">
-      <HintPath>..\packages\Google.Apis.1.16.0\lib\net45\Google.Apis.PlatformServices.dll</HintPath>
+      <HintPath>..\packages\Google.Apis.1.21.0\lib\net45\Google.Apis.PlatformServices.dll</HintPath>
     </Reference>
     <Reference Include="Google.Apis.Auth">
-      <HintPath>..\packages\Google.Apis.Auth.1.16.0\lib\net45\Google.Apis.Auth.dll</HintPath>
+      <HintPath>..\packages\Google.Apis.Auth.1.21.0\lib\net45\Google.Apis.Auth.dll</HintPath>
     </Reference>
     <Reference Include="Google.Apis.Auth.PlatformServices">
-      <HintPath>..\packages\Google.Apis.Auth.1.16.0\lib\net45\Google.Apis.Auth.PlatformServices.dll</HintPath>
+      <HintPath>..\packages\Google.Apis.Auth.1.21.0\lib\net45\Google.Apis.Auth.PlatformServices.dll</HintPath>
     </Reference>
     <Reference Include="Google.Protobuf">
-      <HintPath>..\packages\Google.Protobuf.3.0.0\lib\net45\Google.Protobuf.dll</HintPath>
+      <HintPath>..\packages\Google.Protobuf.3.2.0\lib\net45\Google.Protobuf.dll</HintPath>
+    </Reference>
+    <Reference Include="nunit.framework">
+      <HintPath>..\packages\NUnit.3.6.0\lib\net45\nunit.framework.dll</HintPath>
+    </Reference>
+    <Reference Include="nunitlite">
+      <HintPath>..\packages\NUnitLite.3.6.0\lib\net45\nunitlite.dll</HintPath>
+    </Reference>
+    <Reference Include="Newtonsoft.Json">
+      <HintPath>..\packages\Newtonsoft.Json.9.0.1\lib\net45\Newtonsoft.Json.dll</HintPath>
     </Reference>
     <Reference Include="Castle.Core">
-      <HintPath>..\packages\Castle.Core.3.3.3\lib\net45\Castle.Core.dll</HintPath>
+      <HintPath>..\packages\Castle.Core.4.0.0\lib\net45\Castle.Core.dll</HintPath>
     </Reference>
     <Reference Include="Moq">
-      <HintPath>..\packages\Moq.4.6.38-alpha\lib\net45\Moq.dll</HintPath>
+      <HintPath>..\packages\Moq.4.7.0\lib\net45\Moq.dll</HintPath>
     </Reference>
-    <Reference Include="System.Interactive.Async">
-      <HintPath>..\packages\System.Interactive.Async.3.1.1\lib\net45\System.Interactive.Async.dll</HintPath>
+    <Reference Include="CommandLine">
+      <HintPath>..\packages\CommandLineParser.2.1.1-beta\lib\net45\CommandLine.dll</HintPath>
     </Reference>
   </ItemGroup>
   <ItemGroup>
diff --git a/src/csharp/Grpc.IntegrationTesting/Messages.cs b/src/csharp/Grpc.IntegrationTesting/Messages.cs
index 369fe738d6..278ef662e4 100644
--- a/src/csharp/Grpc.IntegrationTesting/Messages.cs
+++ b/src/csharp/Grpc.IntegrationTesting/Messages.cs
@@ -75,12 +75,12 @@ namespace Grpc.Testing {
   }
   #region Enums
   /// <summary>
-  ///  DEPRECATED, don't use. To be removed shortly.
-  ///  The type of payload that should be returned.
+  /// DEPRECATED, don't use. To be removed shortly.
+  /// The type of payload that should be returned.
   /// </summary>
   public enum PayloadType {
     /// <summary>
-    ///  Compressable text format.
+    /// Compressable text format.
     /// </summary>
     [pbr::OriginalName("COMPRESSABLE")] Compressable = 0,
   }
@@ -89,9 +89,9 @@ namespace Grpc.Testing {
 
   #region Messages
   /// <summary>
-  ///  TODO(dgq): Go back to using well-known types once
-  ///  https://github.com/grpc/grpc/issues/6980 has been fixed.
-  ///  import "google/protobuf/wrappers.proto";
+  /// TODO(dgq): Go back to using well-known types once
+  /// https://github.com/grpc/grpc/issues/6980 has been fixed.
+  /// import "google/protobuf/wrappers.proto";
   /// </summary>
   public sealed partial class BoolValue : pb::IMessage<BoolValue> {
     private static readonly pb::MessageParser<BoolValue> _parser = new pb::MessageParser<BoolValue>(() => new BoolValue());
@@ -129,7 +129,7 @@ namespace Grpc.Testing {
     public const int ValueFieldNumber = 1;
     private bool value_;
     /// <summary>
-    ///  The bool value.
+    /// The bool value.
     /// </summary>
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public bool Value {
@@ -214,7 +214,7 @@ namespace Grpc.Testing {
   }
 
   /// <summary>
-  ///  A block of data, to simply increase gRPC message size.
+  /// A block of data, to simply increase gRPC message size.
   /// </summary>
   public sealed partial class Payload : pb::IMessage<Payload> {
     private static readonly pb::MessageParser<Payload> _parser = new pb::MessageParser<Payload>(() => new Payload());
@@ -253,8 +253,8 @@ namespace Grpc.Testing {
     public const int TypeFieldNumber = 1;
     private global::Grpc.Testing.PayloadType type_ = 0;
     /// <summary>
-    ///  DEPRECATED, don't use. To be removed shortly.
-    ///  The type of data in body.
+    /// DEPRECATED, don't use. To be removed shortly.
+    /// The type of data in body.
     /// </summary>
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public global::Grpc.Testing.PayloadType Type {
@@ -268,7 +268,7 @@ namespace Grpc.Testing {
     public const int BodyFieldNumber = 2;
     private pb::ByteString body_ = pb::ByteString.Empty;
     /// <summary>
-    ///  Primary contents of payload.
+    /// Primary contents of payload.
     /// </summary>
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public pb::ByteString Body {
@@ -369,8 +369,8 @@ namespace Grpc.Testing {
   }
 
   /// <summary>
-  ///  A protobuf representation for grpc status. This is used by test
-  ///  clients to specify a status that the server should attempt to return.
+  /// A protobuf representation for grpc status. This is used by test
+  /// clients to specify a status that the server should attempt to return.
   /// </summary>
   public sealed partial class EchoStatus : pb::IMessage<EchoStatus> {
     private static readonly pb::MessageParser<EchoStatus> _parser = new pb::MessageParser<EchoStatus>(() => new EchoStatus());
@@ -518,7 +518,7 @@ namespace Grpc.Testing {
   }
 
   /// <summary>
-  ///  Unary request.
+  /// Unary request.
   /// </summary>
   public sealed partial class SimpleRequest : pb::IMessage<SimpleRequest> {
     private static readonly pb::MessageParser<SimpleRequest> _parser = new pb::MessageParser<SimpleRequest>(() => new SimpleRequest());
@@ -563,9 +563,9 @@ namespace Grpc.Testing {
     public const int ResponseTypeFieldNumber = 1;
     private global::Grpc.Testing.PayloadType responseType_ = 0;
     /// <summary>
-    ///  DEPRECATED, don't use. To be removed shortly.
-    ///  Desired payload type in the response from the server.
-    ///  If response_type is RANDOM, server randomly chooses one from other formats.
+    /// DEPRECATED, don't use. To be removed shortly.
+    /// Desired payload type in the response from the server.
+    /// If response_type is RANDOM, server randomly chooses one from other formats.
     /// </summary>
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public global::Grpc.Testing.PayloadType ResponseType {
@@ -579,7 +579,7 @@ namespace Grpc.Testing {
     public const int ResponseSizeFieldNumber = 2;
     private int responseSize_;
     /// <summary>
-    ///  Desired payload size in the response from the server.
+    /// Desired payload size in the response from the server.
     /// </summary>
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public int ResponseSize {
@@ -593,7 +593,7 @@ namespace Grpc.Testing {
     public const int PayloadFieldNumber = 3;
     private global::Grpc.Testing.Payload payload_;
     /// <summary>
-    ///  Optional input payload sent along with the request.
+    /// Optional input payload sent along with the request.
     /// </summary>
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public global::Grpc.Testing.Payload Payload {
@@ -607,7 +607,7 @@ namespace Grpc.Testing {
     public const int FillUsernameFieldNumber = 4;
     private bool fillUsername_;
     /// <summary>
-    ///  Whether SimpleResponse should include username.
+    /// Whether SimpleResponse should include username.
     /// </summary>
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public bool FillUsername {
@@ -621,7 +621,7 @@ namespace Grpc.Testing {
     public const int FillOauthScopeFieldNumber = 5;
     private bool fillOauthScope_;
     /// <summary>
-    ///  Whether SimpleResponse should include OAuth scope.
+    /// Whether SimpleResponse should include OAuth scope.
     /// </summary>
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public bool FillOauthScope {
@@ -635,10 +635,10 @@ namespace Grpc.Testing {
     public const int ResponseCompressedFieldNumber = 6;
     private global::Grpc.Testing.BoolValue responseCompressed_;
     /// <summary>
-    ///  Whether to request the server to compress the response. This field is
-    ///  "nullable" in order to interoperate seamlessly with clients not able to
-    ///  implement the full compression tests by introspecting the call to verify
-    ///  the response's compression status.
+    /// Whether to request the server to compress the response. This field is
+    /// "nullable" in order to interoperate seamlessly with clients not able to
+    /// implement the full compression tests by introspecting the call to verify
+    /// the response's compression status.
     /// </summary>
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public global::Grpc.Testing.BoolValue ResponseCompressed {
@@ -652,7 +652,7 @@ namespace Grpc.Testing {
     public const int ResponseStatusFieldNumber = 7;
     private global::Grpc.Testing.EchoStatus responseStatus_;
     /// <summary>
-    ///  Whether server should return a given status
+    /// Whether server should return a given status
     /// </summary>
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public global::Grpc.Testing.EchoStatus ResponseStatus {
@@ -666,7 +666,7 @@ namespace Grpc.Testing {
     public const int ExpectCompressedFieldNumber = 8;
     private global::Grpc.Testing.BoolValue expectCompressed_;
     /// <summary>
-    ///  Whether the server should expect this request to be compressed.
+    /// Whether the server should expect this request to be compressed.
     /// </summary>
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public global::Grpc.Testing.BoolValue ExpectCompressed {
@@ -887,7 +887,7 @@ namespace Grpc.Testing {
   }
 
   /// <summary>
-  ///  Unary response, as configured by the request.
+  /// Unary response, as configured by the request.
   /// </summary>
   public sealed partial class SimpleResponse : pb::IMessage<SimpleResponse> {
     private static readonly pb::MessageParser<SimpleResponse> _parser = new pb::MessageParser<SimpleResponse>(() => new SimpleResponse());
@@ -927,7 +927,7 @@ namespace Grpc.Testing {
     public const int PayloadFieldNumber = 1;
     private global::Grpc.Testing.Payload payload_;
     /// <summary>
-    ///  Payload to increase message size.
+    /// Payload to increase message size.
     /// </summary>
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public global::Grpc.Testing.Payload Payload {
@@ -941,8 +941,8 @@ namespace Grpc.Testing {
     public const int UsernameFieldNumber = 2;
     private string username_ = "";
     /// <summary>
-    ///  The user the request came from, for verifying authentication was
-    ///  successful when the client expected it.
+    /// The user the request came from, for verifying authentication was
+    /// successful when the client expected it.
     /// </summary>
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public string Username {
@@ -956,7 +956,7 @@ namespace Grpc.Testing {
     public const int OauthScopeFieldNumber = 3;
     private string oauthScope_ = "";
     /// <summary>
-    ///  OAuth scope.
+    /// OAuth scope.
     /// </summary>
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public string OauthScope {
@@ -1079,7 +1079,7 @@ namespace Grpc.Testing {
   }
 
   /// <summary>
-  ///  Client-streaming request.
+  /// Client-streaming request.
   /// </summary>
   public sealed partial class StreamingInputCallRequest : pb::IMessage<StreamingInputCallRequest> {
     private static readonly pb::MessageParser<StreamingInputCallRequest> _parser = new pb::MessageParser<StreamingInputCallRequest>(() => new StreamingInputCallRequest());
@@ -1118,7 +1118,7 @@ namespace Grpc.Testing {
     public const int PayloadFieldNumber = 1;
     private global::Grpc.Testing.Payload payload_;
     /// <summary>
-    ///  Optional input payload sent along with the request.
+    /// Optional input payload sent along with the request.
     /// </summary>
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public global::Grpc.Testing.Payload Payload {
@@ -1132,10 +1132,10 @@ namespace Grpc.Testing {
     public const int ExpectCompressedFieldNumber = 2;
     private global::Grpc.Testing.BoolValue expectCompressed_;
     /// <summary>
-    ///  Whether the server should expect this request to be compressed. This field
-    ///  is "nullable" in order to interoperate seamlessly with servers not able to
-    ///  implement the full compression tests by introspecting the call to verify
-    ///  the request's compression status.
+    /// Whether the server should expect this request to be compressed. This field
+    /// is "nullable" in order to interoperate seamlessly with servers not able to
+    /// implement the full compression tests by introspecting the call to verify
+    /// the request's compression status.
     /// </summary>
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public global::Grpc.Testing.BoolValue ExpectCompressed {
@@ -1248,7 +1248,7 @@ namespace Grpc.Testing {
   }
 
   /// <summary>
-  ///  Client-streaming response.
+  /// Client-streaming response.
   /// </summary>
   public sealed partial class StreamingInputCallResponse : pb::IMessage<StreamingInputCallResponse> {
     private static readonly pb::MessageParser<StreamingInputCallResponse> _parser = new pb::MessageParser<StreamingInputCallResponse>(() => new StreamingInputCallResponse());
@@ -1286,7 +1286,7 @@ namespace Grpc.Testing {
     public const int AggregatedPayloadSizeFieldNumber = 1;
     private int aggregatedPayloadSize_;
     /// <summary>
-    ///  Aggregated size of payloads received from the client.
+    /// Aggregated size of payloads received from the client.
     /// </summary>
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public int AggregatedPayloadSize {
@@ -1371,7 +1371,7 @@ namespace Grpc.Testing {
   }
 
   /// <summary>
-  ///  Configuration for a particular response.
+  /// Configuration for a particular response.
   /// </summary>
   public sealed partial class ResponseParameters : pb::IMessage<ResponseParameters> {
     private static readonly pb::MessageParser<ResponseParameters> _parser = new pb::MessageParser<ResponseParameters>(() => new ResponseParameters());
@@ -1411,7 +1411,7 @@ namespace Grpc.Testing {
     public const int SizeFieldNumber = 1;
     private int size_;
     /// <summary>
-    ///  Desired payload sizes in responses from the server.
+    /// Desired payload sizes in responses from the server.
     /// </summary>
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public int Size {
@@ -1425,8 +1425,8 @@ namespace Grpc.Testing {
     public const int IntervalUsFieldNumber = 2;
     private int intervalUs_;
     /// <summary>
-    ///  Desired interval between consecutive responses in the response stream in
-    ///  microseconds.
+    /// Desired interval between consecutive responses in the response stream in
+    /// microseconds.
     /// </summary>
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public int IntervalUs {
@@ -1440,10 +1440,10 @@ namespace Grpc.Testing {
     public const int CompressedFieldNumber = 3;
     private global::Grpc.Testing.BoolValue compressed_;
     /// <summary>
-    ///  Whether to request the server to compress the response. This field is
-    ///  "nullable" in order to interoperate seamlessly with clients not able to
-    ///  implement the full compression tests by introspecting the call to verify
-    ///  the response's compression status.
+    /// Whether to request the server to compress the response. This field is
+    /// "nullable" in order to interoperate seamlessly with clients not able to
+    /// implement the full compression tests by introspecting the call to verify
+    /// the response's compression status.
     /// </summary>
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public global::Grpc.Testing.BoolValue Compressed {
@@ -1566,7 +1566,7 @@ namespace Grpc.Testing {
   }
 
   /// <summary>
-  ///  Server-streaming request.
+  /// Server-streaming request.
   /// </summary>
   public sealed partial class StreamingOutputCallRequest : pb::IMessage<StreamingOutputCallRequest> {
     private static readonly pb::MessageParser<StreamingOutputCallRequest> _parser = new pb::MessageParser<StreamingOutputCallRequest>(() => new StreamingOutputCallRequest());
@@ -1607,11 +1607,11 @@ namespace Grpc.Testing {
     public const int ResponseTypeFieldNumber = 1;
     private global::Grpc.Testing.PayloadType responseType_ = 0;
     /// <summary>
-    ///  DEPRECATED, don't use. To be removed shortly.
-    ///  Desired payload type in the response from the server.
-    ///  If response_type is RANDOM, the payload from each response in the stream
-    ///  might be of different types. This is to simulate a mixed type of payload
-    ///  stream.
+    /// DEPRECATED, don't use. To be removed shortly.
+    /// Desired payload type in the response from the server.
+    /// If response_type is RANDOM, the payload from each response in the stream
+    /// might be of different types. This is to simulate a mixed type of payload
+    /// stream.
     /// </summary>
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public global::Grpc.Testing.PayloadType ResponseType {
@@ -1627,7 +1627,7 @@ namespace Grpc.Testing {
         = pb::FieldCodec.ForMessage(18, global::Grpc.Testing.ResponseParameters.Parser);
     private readonly pbc::RepeatedField<global::Grpc.Testing.ResponseParameters> responseParameters_ = new pbc::RepeatedField<global::Grpc.Testing.ResponseParameters>();
     /// <summary>
-    ///  Configuration for each expected response message.
+    /// Configuration for each expected response message.
     /// </summary>
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public pbc::RepeatedField<global::Grpc.Testing.ResponseParameters> ResponseParameters {
@@ -1638,7 +1638,7 @@ namespace Grpc.Testing {
     public const int PayloadFieldNumber = 3;
     private global::Grpc.Testing.Payload payload_;
     /// <summary>
-    ///  Optional input payload sent along with the request.
+    /// Optional input payload sent along with the request.
     /// </summary>
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public global::Grpc.Testing.Payload Payload {
@@ -1652,7 +1652,7 @@ namespace Grpc.Testing {
     public const int ResponseStatusFieldNumber = 7;
     private global::Grpc.Testing.EchoStatus responseStatus_;
     /// <summary>
-    ///  Whether server should return a given status
+    /// Whether server should return a given status
     /// </summary>
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public global::Grpc.Testing.EchoStatus ResponseStatus {
@@ -1790,7 +1790,7 @@ namespace Grpc.Testing {
   }
 
   /// <summary>
-  ///  Server-streaming response, as configured by the request and parameters.
+  /// Server-streaming response, as configured by the request and parameters.
   /// </summary>
   public sealed partial class StreamingOutputCallResponse : pb::IMessage<StreamingOutputCallResponse> {
     private static readonly pb::MessageParser<StreamingOutputCallResponse> _parser = new pb::MessageParser<StreamingOutputCallResponse>(() => new StreamingOutputCallResponse());
@@ -1828,7 +1828,7 @@ namespace Grpc.Testing {
     public const int PayloadFieldNumber = 1;
     private global::Grpc.Testing.Payload payload_;
     /// <summary>
-    ///  Payload to increase response size.
+    /// Payload to increase response size.
     /// </summary>
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public global::Grpc.Testing.Payload Payload {
@@ -1919,8 +1919,8 @@ namespace Grpc.Testing {
   }
 
   /// <summary>
-  ///  For reconnect interop test only.
-  ///  Client tells server what reconnection parameters it used.
+  /// For reconnect interop test only.
+  /// Client tells server what reconnection parameters it used.
   /// </summary>
   public sealed partial class ReconnectParams : pb::IMessage<ReconnectParams> {
     private static readonly pb::MessageParser<ReconnectParams> _parser = new pb::MessageParser<ReconnectParams>(() => new ReconnectParams());
@@ -2040,9 +2040,9 @@ namespace Grpc.Testing {
   }
 
   /// <summary>
-  ///  For reconnect interop test only.
-  ///  Server tells client whether its reconnects are following the spec and the
-  ///  reconnect backoffs it saw.
+  /// For reconnect interop test only.
+  /// Server tells client whether its reconnects are following the spec and the
+  /// reconnect backoffs it saw.
   /// </summary>
   public sealed partial class ReconnectInfo : pb::IMessage<ReconnectInfo> {
     private static readonly pb::MessageParser<ReconnectInfo> _parser = new pb::MessageParser<ReconnectInfo>(() => new ReconnectInfo());
diff --git a/src/csharp/Grpc.IntegrationTesting/Metrics.cs b/src/csharp/Grpc.IntegrationTesting/Metrics.cs
index 4de1847e5f..84eb09af4f 100644
--- a/src/csharp/Grpc.IntegrationTesting/Metrics.cs
+++ b/src/csharp/Grpc.IntegrationTesting/Metrics.cs
@@ -44,7 +44,7 @@ namespace Grpc.Testing {
   }
   #region Messages
   /// <summary>
-  ///  Reponse message containing the gauge name and value
+  /// Reponse message containing the gauge name and value
   /// </summary>
   public sealed partial class GaugeResponse : pb::IMessage<GaugeResponse> {
     private static readonly pb::MessageParser<GaugeResponse> _parser = new pb::MessageParser<GaugeResponse>(() => new GaugeResponse());
@@ -282,7 +282,7 @@ namespace Grpc.Testing {
   }
 
   /// <summary>
-  ///  Request message containing the gauge name
+  /// Request message containing the gauge name
   /// </summary>
   public sealed partial class GaugeRequest : pb::IMessage<GaugeRequest> {
     private static readonly pb::MessageParser<GaugeRequest> _parser = new pb::MessageParser<GaugeRequest>(() => new GaugeRequest());
diff --git a/src/csharp/Grpc.IntegrationTesting/Payloads.cs b/src/csharp/Grpc.IntegrationTesting/Payloads.cs
index 7aef35cda3..f918b9576b 100644
--- a/src/csharp/Grpc.IntegrationTesting/Payloads.cs
+++ b/src/csharp/Grpc.IntegrationTesting/Payloads.cs
@@ -335,8 +335,8 @@ namespace Grpc.Testing {
   }
 
   /// <summary>
-  ///  TODO (vpai): Fill this in once the details of complex, representative
-  ///               protos are decided
+  /// TODO (vpai): Fill this in once the details of complex, representative
+  ///              protos are decided
   /// </summary>
   public sealed partial class ComplexProtoParams : pb::IMessage<ComplexProtoParams> {
     private static readonly pb::MessageParser<ComplexProtoParams> _parser = new pb::MessageParser<ComplexProtoParams>(() => new ComplexProtoParams());
diff --git a/src/csharp/Grpc.IntegrationTesting/SslCredentialsTest.cs b/src/csharp/Grpc.IntegrationTesting/SslCredentialsTest.cs
index f85e272711..377dad63f4 100644
--- a/src/csharp/Grpc.IntegrationTesting/SslCredentialsTest.cs
+++ b/src/csharp/Grpc.IntegrationTesting/SslCredentialsTest.cs
@@ -37,6 +37,7 @@ using System.IO;
 using System.Linq;
 using System.Threading;
 using System.Threading.Tasks;
+using Google.Protobuf;
 using Grpc.Core;
 using Grpc.Core.Utils;
 using Grpc.Testing;
@@ -68,7 +69,7 @@ namespace Grpc.IntegrationTesting
 
             server = new Server
             {
-                Services = { TestService.BindService(new TestServiceImpl()) },
+                Services = { TestService.BindService(new SslCredentialsTestServiceImpl()) },
                 Ports = { { Host, ServerPort.PickUnused, serverCredentials } }
             };
             server.Start();
@@ -95,5 +96,40 @@ namespace Grpc.IntegrationTesting
             var response = client.UnaryCall(new SimpleRequest { ResponseSize = 10 });
             Assert.AreEqual(10, response.Payload.Body.Length);
         }
+
+        [Test]
+        public async Task AuthContextIsPopulated()
+        {
+            var call = client.StreamingInputCall();
+            await call.RequestStream.CompleteAsync();
+            var response = await call.ResponseAsync;
+            Assert.AreEqual(12345, response.AggregatedPayloadSize);
+        }
+
+        private class SslCredentialsTestServiceImpl : TestService.TestServiceBase
+        {
+            public override async Task<SimpleResponse> UnaryCall(SimpleRequest request, ServerCallContext context)
+            {
+                return new SimpleResponse { Payload = CreateZerosPayload(request.ResponseSize) };
+            }
+
+            public override async Task<StreamingInputCallResponse> StreamingInputCall(IAsyncStreamReader<StreamingInputCallRequest> requestStream, ServerCallContext context)
+            {
+                var authContext = context.AuthContext;
+                await requestStream.ForEachAsync(async request => {});
+
+                Assert.IsTrue(authContext.IsPeerAuthenticated);
+                Assert.AreEqual("x509_subject_alternative_name", authContext.PeerIdentityPropertyName);
+                Assert.IsTrue(authContext.PeerIdentity.Count() > 0);
+                Assert.AreEqual("ssl", authContext.FindPropertiesByName("transport_security_type").First().Value);
+
+                return new StreamingInputCallResponse { AggregatedPayloadSize = 12345 };
+            }
+
+            private static Payload CreateZerosPayload(int size)
+            {
+                return new Payload { Body = ByteString.CopyFrom(new byte[size]) };
+            }
+        }
     }
 }
diff --git a/src/csharp/Grpc.IntegrationTesting/Stats.cs b/src/csharp/Grpc.IntegrationTesting/Stats.cs
index 504aa11d8a..79ff220436 100644
--- a/src/csharp/Grpc.IntegrationTesting/Stats.cs
+++ b/src/csharp/Grpc.IntegrationTesting/Stats.cs
@@ -90,7 +90,7 @@ namespace Grpc.Testing {
     public const int TimeElapsedFieldNumber = 1;
     private double timeElapsed_;
     /// <summary>
-    ///  wall clock time change in seconds since last reset
+    /// wall clock time change in seconds since last reset
     /// </summary>
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public double TimeElapsed {
@@ -104,7 +104,7 @@ namespace Grpc.Testing {
     public const int TimeUserFieldNumber = 2;
     private double timeUser_;
     /// <summary>
-    ///  change in user time (in seconds) used by the server since last reset
+    /// change in user time (in seconds) used by the server since last reset
     /// </summary>
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public double TimeUser {
@@ -118,8 +118,8 @@ namespace Grpc.Testing {
     public const int TimeSystemFieldNumber = 3;
     private double timeSystem_;
     /// <summary>
-    ///  change in server time (in seconds) used by the server process and all
-    ///  threads since last reset
+    /// change in server time (in seconds) used by the server process and all
+    /// threads since last reset
     /// </summary>
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public double TimeSystem {
@@ -133,7 +133,7 @@ namespace Grpc.Testing {
     public const int TotalCpuTimeFieldNumber = 4;
     private ulong totalCpuTime_;
     /// <summary>
-    ///  change in total cpu time of the server (data from proc/stat)
+    /// change in total cpu time of the server (data from proc/stat)
     /// </summary>
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public ulong TotalCpuTime {
@@ -147,7 +147,7 @@ namespace Grpc.Testing {
     public const int IdleCpuTimeFieldNumber = 5;
     private ulong idleCpuTime_;
     /// <summary>
-    ///  change in idle time of the server (data from proc/stat)
+    /// change in idle time of the server (data from proc/stat)
     /// </summary>
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public ulong IdleCpuTime {
@@ -296,7 +296,7 @@ namespace Grpc.Testing {
   }
 
   /// <summary>
-  ///  Histogram params based on grpc/support/histogram.c
+  /// Histogram params based on grpc/support/histogram.c
   /// </summary>
   public sealed partial class HistogramParams : pb::IMessage<HistogramParams> {
     private static readonly pb::MessageParser<HistogramParams> _parser = new pb::MessageParser<HistogramParams>(() => new HistogramParams());
@@ -335,7 +335,7 @@ namespace Grpc.Testing {
     public const int ResolutionFieldNumber = 1;
     private double resolution_;
     /// <summary>
-    ///  first bucket is [0, 1 + resolution)
+    /// first bucket is [0, 1 + resolution)
     /// </summary>
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public double Resolution {
@@ -349,7 +349,7 @@ namespace Grpc.Testing {
     public const int MaxPossibleFieldNumber = 2;
     private double maxPossible_;
     /// <summary>
-    ///  use enough buckets to allow this value
+    /// use enough buckets to allow this value
     /// </summary>
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public double MaxPossible {
@@ -450,7 +450,7 @@ namespace Grpc.Testing {
   }
 
   /// <summary>
-  ///  Histogram data based on grpc/support/histogram.c
+  /// Histogram data based on grpc/support/histogram.c
   /// </summary>
   public sealed partial class HistogramData : pb::IMessage<HistogramData> {
     private static readonly pb::MessageParser<HistogramData> _parser = new pb::MessageParser<HistogramData>(() => new HistogramData());
@@ -887,7 +887,7 @@ namespace Grpc.Testing {
     public const int LatenciesFieldNumber = 1;
     private global::Grpc.Testing.HistogramData latencies_;
     /// <summary>
-    ///  Latency histogram. Data points are in nanoseconds.
+    /// Latency histogram. Data points are in nanoseconds.
     /// </summary>
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public global::Grpc.Testing.HistogramData Latencies {
@@ -901,7 +901,7 @@ namespace Grpc.Testing {
     public const int TimeElapsedFieldNumber = 2;
     private double timeElapsed_;
     /// <summary>
-    ///  See ServerStats for details.
+    /// See ServerStats for details.
     /// </summary>
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public double TimeElapsed {
@@ -939,7 +939,7 @@ namespace Grpc.Testing {
         = pb::FieldCodec.ForMessage(42, global::Grpc.Testing.RequestResultCount.Parser);
     private readonly pbc::RepeatedField<global::Grpc.Testing.RequestResultCount> requestResults_ = new pbc::RepeatedField<global::Grpc.Testing.RequestResultCount>();
     /// <summary>
-    ///  Number of failed requests (one row per status code seen)
+    /// Number of failed requests (one row per status code seen)
     /// </summary>
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public pbc::RepeatedField<global::Grpc.Testing.RequestResultCount> RequestResults {
diff --git a/src/csharp/Grpc.IntegrationTesting/packages.config b/src/csharp/Grpc.IntegrationTesting/packages.config
index a03ee926f4..030f9d97b8 100644
--- a/src/csharp/Grpc.IntegrationTesting/packages.config
+++ b/src/csharp/Grpc.IntegrationTesting/packages.config
@@ -1,17 +1,15 @@
 <?xml version="1.0" encoding="utf-8"?>
 <packages>
-  <package id="BouncyCastle" version="1.7.0" targetFramework="net45" />
-  <package id="Castle.Core" version="3.3.3" targetFramework="net45" />
-  <package id="CommandLineParser.Unofficial" version="2.0.275" targetFramework="net45" />
-  <package id="Google.Apis" version="1.16.0" targetFramework="net45" />
-  <package id="Google.Apis.Auth" version="1.16.0" targetFramework="net45" />
-  <package id="Google.Apis.Core" version="1.16.0" targetFramework="net45" />
-  <package id="Google.Protobuf" version="3.0.0" targetFramework="net45" />
-  <package id="log4net" version="2.0.3" targetFramework="net45" />
-  <package id="Moq" version="4.6.38-alpha" targetFramework="net45" />
-  <package id="Newtonsoft.Json" version="7.0.1" targetFramework="net45" />
-  <package id="NUnit" version="3.2.0" targetFramework="net45" />
-  <package id="NUnitLite" version="3.2.0" targetFramework="net45" />
+  <package id="Castle.Core" version="4.0.0" targetFramework="net45" />
+  <package id="CommandLineParser" version="2.1.1-beta" targetFramework="net45" />
+  <package id="Google.Apis" version="1.21.0" targetFramework="net45" />
+  <package id="Google.Apis.Auth" version="1.21.0" targetFramework="net45" />
+  <package id="Google.Apis.Core" version="1.21.0" targetFramework="net45" />
+  <package id="Google.Protobuf" version="3.2.0" targetFramework="net45" />
+  <package id="Moq" version="4.7.0" targetFramework="net45" />
+  <package id="Newtonsoft.Json" version="9.0.1" targetFramework="net45" />
+  <package id="NUnit" version="3.6.0" targetFramework="net45" />
+  <package id="NUnitLite" version="3.6.0" targetFramework="net45" />
   <package id="System.Interactive.Async" version="3.1.1" targetFramework="net45" />
   <package id="Zlib.Portable.Signed" version="1.11.0" targetFramework="net45" />
 </packages>
\ No newline at end of file
diff --git a/src/csharp/Grpc.IntegrationTesting/project.json b/src/csharp/Grpc.IntegrationTesting/project.json
index eba54318a5..40fc566adc 100644
--- a/src/csharp/Grpc.IntegrationTesting/project.json
+++ b/src/csharp/Grpc.IntegrationTesting/project.json
@@ -54,18 +54,15 @@
     "Grpc.Core": {
       "target": "project"
     },
-    "Google.Protobuf": "3.0.0",
-    "CommandLineParser.Unofficial": "2.0.275",
-    "Moq": "4.6.38-alpha",
-    "NUnit": "3.2.0",
-    "NUnitLite": "3.2.0-*"
+    "Google.Protobuf": "3.2.0",
+    "CommandLineParser": "2.1.1-beta",
+    "Moq": "4.7.0",
+    "NUnit": "3.6.0",
+    "NUnitLite": "3.6.0"
   },
   "frameworks": {
     "net45": {
-      "frameworkAssemblies": {
-        "System.Runtime": "",
-        "System.IO": ""
-      }
+      "frameworkAssemblies": {}
     },
     "netcoreapp1.0": {
       "imports": [
diff --git a/src/csharp/Grpc.Reflection.Tests/Grpc.Reflection.Tests.csproj b/src/csharp/Grpc.Reflection.Tests/Grpc.Reflection.Tests.csproj
index c5918b194e..7e2b551799 100644
--- a/src/csharp/Grpc.Reflection.Tests/Grpc.Reflection.Tests.csproj
+++ b/src/csharp/Grpc.Reflection.Tests/Grpc.Reflection.Tests.csproj
@@ -35,17 +35,17 @@
     <Reference Include="Microsoft.CSharp" />
     <Reference Include="System.Data" />
     <Reference Include="System.Xml" />
-    <Reference Include="nunit.framework">
-      <HintPath>..\packages\NUnit.3.2.0\lib\net45\nunit.framework.dll</HintPath>
-    </Reference>
-    <Reference Include="nunitlite">
-      <HintPath>..\packages\NUnitLite.3.2.0\lib\net45\nunitlite.dll</HintPath>
+    <Reference Include="System.Interactive.Async">
+      <HintPath>..\packages\System.Interactive.Async.3.1.1\lib\net45\System.Interactive.Async.dll</HintPath>
     </Reference>
     <Reference Include="Google.Protobuf">
-      <HintPath>..\packages\Google.Protobuf.3.0.0\lib\net45\Google.Protobuf.dll</HintPath>
+      <HintPath>..\packages\Google.Protobuf.3.2.0\lib\net45\Google.Protobuf.dll</HintPath>
     </Reference>
-    <Reference Include="System.Interactive.Async">
-      <HintPath>..\packages\System.Interactive.Async.3.1.1\lib\net45\System.Interactive.Async.dll</HintPath>
+    <Reference Include="nunit.framework">
+      <HintPath>..\packages\NUnit.3.6.0\lib\net45\nunit.framework.dll</HintPath>
+    </Reference>
+    <Reference Include="nunitlite">
+      <HintPath>..\packages\NUnitLite.3.6.0\lib\net45\nunitlite.dll</HintPath>
     </Reference>
   </ItemGroup>
   <ItemGroup>
diff --git a/src/csharp/Grpc.Reflection.Tests/packages.config b/src/csharp/Grpc.Reflection.Tests/packages.config
index 0fed4dbd41..8a7f7a0652 100644
--- a/src/csharp/Grpc.Reflection.Tests/packages.config
+++ b/src/csharp/Grpc.Reflection.Tests/packages.config
@@ -1,7 +1,7 @@
 <?xml version="1.0" encoding="utf-8"?>
 <packages>
-  <package id="Google.Protobuf" version="3.0.0" targetFramework="net45" />
-  <package id="NUnit" version="3.2.0" targetFramework="net45" />
-  <package id="NUnitLite" version="3.2.0" targetFramework="net45" />
+  <package id="Google.Protobuf" version="3.2.0" targetFramework="net45" />
+  <package id="NUnit" version="3.6.0" targetFramework="net45" />
+  <package id="NUnitLite" version="3.6.0" targetFramework="net45" />
   <package id="System.Interactive.Async" version="3.1.1" targetFramework="net45" />
 </packages>
\ No newline at end of file
diff --git a/src/csharp/Grpc.Reflection.Tests/project.json b/src/csharp/Grpc.Reflection.Tests/project.json
index b90834a25e..fc05557c88 100644
--- a/src/csharp/Grpc.Reflection.Tests/project.json
+++ b/src/csharp/Grpc.Reflection.Tests/project.json
@@ -45,8 +45,8 @@
     "Grpc.Reflection": {
       "target": "project"
     },
-    "NUnit": "3.2.0",
-    "NUnitLite": "3.2.0-*"
+    "NUnit": "3.6.0",
+    "NUnitLite": "3.6.0"
   },
   "frameworks": {
     "net45": { },
diff --git a/src/csharp/Grpc.Reflection/Grpc.Reflection.csproj b/src/csharp/Grpc.Reflection/Grpc.Reflection.csproj
index 4e254a0b53..b0ab170e3f 100644
--- a/src/csharp/Grpc.Reflection/Grpc.Reflection.csproj
+++ b/src/csharp/Grpc.Reflection/Grpc.Reflection.csproj
@@ -36,12 +36,12 @@
     <Reference Include="Microsoft.CSharp" />
     <Reference Include="System.Data" />
     <Reference Include="System.Xml" />
-    <Reference Include="Google.Protobuf">
-      <HintPath>..\packages\Google.Protobuf.3.0.0\lib\net45\Google.Protobuf.dll</HintPath>
-    </Reference>
     <Reference Include="System.Interactive.Async">
       <HintPath>..\packages\System.Interactive.Async.3.1.1\lib\net45\System.Interactive.Async.dll</HintPath>
     </Reference>
+    <Reference Include="Google.Protobuf">
+      <HintPath>..\packages\Google.Protobuf.3.2.0\lib\net45\Google.Protobuf.dll</HintPath>
+    </Reference>
   </ItemGroup>
   <ItemGroup>
     <Compile Include="..\Grpc.Core\Version.cs">
diff --git a/src/csharp/Grpc.Reflection/Reflection.cs b/src/csharp/Grpc.Reflection/Reflection.cs
index 06c5d08030..86e9aace8c 100644
--- a/src/csharp/Grpc.Reflection/Reflection.cs
+++ b/src/csharp/Grpc.Reflection/Reflection.cs
@@ -70,7 +70,7 @@ namespace Grpc.Reflection.V1Alpha {
   }
   #region Messages
   /// <summary>
-  ///  The message sent by the client when calling ServerReflectionInfo method.
+  /// The message sent by the client when calling ServerReflectionInfo method.
   /// </summary>
   public sealed partial class ServerReflectionRequest : pb::IMessage<ServerReflectionRequest> {
     private static readonly pb::MessageParser<ServerReflectionRequest> _parser = new pb::MessageParser<ServerReflectionRequest>(() => new ServerReflectionRequest());
@@ -136,7 +136,7 @@ namespace Grpc.Reflection.V1Alpha {
     /// <summary>Field number for the "file_by_filename" field.</summary>
     public const int FileByFilenameFieldNumber = 3;
     /// <summary>
-    ///  Find a proto file by the file name.
+    /// Find a proto file by the file name.
     /// </summary>
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public string FileByFilename {
@@ -150,9 +150,9 @@ namespace Grpc.Reflection.V1Alpha {
     /// <summary>Field number for the "file_containing_symbol" field.</summary>
     public const int FileContainingSymbolFieldNumber = 4;
     /// <summary>
-    ///  Find the proto file that declares the given fully-qualified symbol name.
-    ///  This field should be a fully-qualified symbol name
-    ///  (e.g. &lt;package>.&lt;service>[.&lt;method>] or &lt;package>.&lt;type>).
+    /// Find the proto file that declares the given fully-qualified symbol name.
+    /// This field should be a fully-qualified symbol name
+    /// (e.g. &lt;package>.&lt;service>[.&lt;method>] or &lt;package>.&lt;type>).
     /// </summary>
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public string FileContainingSymbol {
@@ -166,8 +166,8 @@ namespace Grpc.Reflection.V1Alpha {
     /// <summary>Field number for the "file_containing_extension" field.</summary>
     public const int FileContainingExtensionFieldNumber = 5;
     /// <summary>
-    ///  Find the proto file which defines an extension extending the given
-    ///  message type with the given field number.
+    /// Find the proto file which defines an extension extending the given
+    /// message type with the given field number.
     /// </summary>
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public global::Grpc.Reflection.V1Alpha.ExtensionRequest FileContainingExtension {
@@ -181,14 +181,14 @@ namespace Grpc.Reflection.V1Alpha {
     /// <summary>Field number for the "all_extension_numbers_of_type" field.</summary>
     public const int AllExtensionNumbersOfTypeFieldNumber = 6;
     /// <summary>
-    ///  Finds the tag numbers used by all known extensions of the given message
-    ///  type, and appends them to ExtensionNumberResponse in an undefined order.
-    ///  Its corresponding method is best-effort: it's not guaranteed that the
-    ///  reflection service will implement this method, and it's not guaranteed
-    ///  that this method will provide all extensions. Returns
-    ///  StatusCode::UNIMPLEMENTED if it's not implemented.
-    ///  This field should be a fully-qualified type name. The format is
-    ///  &lt;package>.&lt;type>
+    /// Finds the tag numbers used by all known extensions of the given message
+    /// type, and appends them to ExtensionNumberResponse in an undefined order.
+    /// Its corresponding method is best-effort: it's not guaranteed that the
+    /// reflection service will implement this method, and it's not guaranteed
+    /// that this method will provide all extensions. Returns
+    /// StatusCode::UNIMPLEMENTED if it's not implemented.
+    /// This field should be a fully-qualified type name. The format is
+    /// &lt;package>.&lt;type>
     /// </summary>
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public string AllExtensionNumbersOfType {
@@ -202,8 +202,8 @@ namespace Grpc.Reflection.V1Alpha {
     /// <summary>Field number for the "list_services" field.</summary>
     public const int ListServicesFieldNumber = 7;
     /// <summary>
-    ///  List the full names of registered services. The content will not be
-    ///  checked.
+    /// List the full names of registered services. The content will not be
+    /// checked.
     /// </summary>
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public string ListServices {
@@ -401,8 +401,8 @@ namespace Grpc.Reflection.V1Alpha {
   }
 
   /// <summary>
-  ///  The type name and extension number sent by the client when requesting
-  ///  file_containing_extension.
+  /// The type name and extension number sent by the client when requesting
+  /// file_containing_extension.
   /// </summary>
   public sealed partial class ExtensionRequest : pb::IMessage<ExtensionRequest> {
     private static readonly pb::MessageParser<ExtensionRequest> _parser = new pb::MessageParser<ExtensionRequest>(() => new ExtensionRequest());
@@ -441,7 +441,7 @@ namespace Grpc.Reflection.V1Alpha {
     public const int ContainingTypeFieldNumber = 1;
     private string containingType_ = "";
     /// <summary>
-    ///  Fully-qualified type name. The format should be &lt;package>.&lt;type>
+    /// Fully-qualified type name. The format should be &lt;package>.&lt;type>
     /// </summary>
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public string ContainingType {
@@ -553,7 +553,7 @@ namespace Grpc.Reflection.V1Alpha {
   }
 
   /// <summary>
-  ///  The message sent by the server to answer ServerReflectionInfo method.
+  /// The message sent by the server to answer ServerReflectionInfo method.
   /// </summary>
   public sealed partial class ServerReflectionResponse : pb::IMessage<ServerReflectionResponse> {
     private static readonly pb::MessageParser<ServerReflectionResponse> _parser = new pb::MessageParser<ServerReflectionResponse>(() => new ServerReflectionResponse());
@@ -628,12 +628,12 @@ namespace Grpc.Reflection.V1Alpha {
     /// <summary>Field number for the "file_descriptor_response" field.</summary>
     public const int FileDescriptorResponseFieldNumber = 4;
     /// <summary>
-    ///  This message is used to answer file_by_filename, file_containing_symbol,
-    ///  file_containing_extension requests with transitive dependencies. As
-    ///  the repeated label is not allowed in oneof fields, we use a
-    ///  FileDescriptorResponse message to encapsulate the repeated fields.
-    ///  The reflection service is allowed to avoid sending FileDescriptorProtos
-    ///  that were previously sent in response to earlier requests in the stream.
+    /// This message is used to answer file_by_filename, file_containing_symbol,
+    /// file_containing_extension requests with transitive dependencies. As
+    /// the repeated label is not allowed in oneof fields, we use a
+    /// FileDescriptorResponse message to encapsulate the repeated fields.
+    /// The reflection service is allowed to avoid sending FileDescriptorProtos
+    /// that were previously sent in response to earlier requests in the stream.
     /// </summary>
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public global::Grpc.Reflection.V1Alpha.FileDescriptorResponse FileDescriptorResponse {
@@ -647,7 +647,7 @@ namespace Grpc.Reflection.V1Alpha {
     /// <summary>Field number for the "all_extension_numbers_response" field.</summary>
     public const int AllExtensionNumbersResponseFieldNumber = 5;
     /// <summary>
-    ///  This message is used to answer all_extension_numbers_of_type requst.
+    /// This message is used to answer all_extension_numbers_of_type requst.
     /// </summary>
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public global::Grpc.Reflection.V1Alpha.ExtensionNumberResponse AllExtensionNumbersResponse {
@@ -661,7 +661,7 @@ namespace Grpc.Reflection.V1Alpha {
     /// <summary>Field number for the "list_services_response" field.</summary>
     public const int ListServicesResponseFieldNumber = 6;
     /// <summary>
-    ///  This message is used to answer list_services request.
+    /// This message is used to answer list_services request.
     /// </summary>
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public global::Grpc.Reflection.V1Alpha.ListServiceResponse ListServicesResponse {
@@ -675,7 +675,7 @@ namespace Grpc.Reflection.V1Alpha {
     /// <summary>Field number for the "error_response" field.</summary>
     public const int ErrorResponseFieldNumber = 7;
     /// <summary>
-    ///  This message is used when an error occurs.
+    /// This message is used when an error occurs.
     /// </summary>
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public global::Grpc.Reflection.V1Alpha.ErrorResponse ErrorResponse {
@@ -893,9 +893,9 @@ namespace Grpc.Reflection.V1Alpha {
   }
 
   /// <summary>
-  ///  Serialized FileDescriptorProto messages sent by the server answering
-  ///  a file_by_filename, file_containing_symbol, or file_containing_extension
-  ///  request.
+  /// Serialized FileDescriptorProto messages sent by the server answering
+  /// a file_by_filename, file_containing_symbol, or file_containing_extension
+  /// request.
   /// </summary>
   public sealed partial class FileDescriptorResponse : pb::IMessage<FileDescriptorResponse> {
     private static readonly pb::MessageParser<FileDescriptorResponse> _parser = new pb::MessageParser<FileDescriptorResponse>(() => new FileDescriptorResponse());
@@ -935,9 +935,9 @@ namespace Grpc.Reflection.V1Alpha {
         = pb::FieldCodec.ForBytes(10);
     private readonly pbc::RepeatedField<pb::ByteString> fileDescriptorProto_ = new pbc::RepeatedField<pb::ByteString>();
     /// <summary>
-    ///  Serialized FileDescriptorProto messages. We avoid taking a dependency on
-    ///  descriptor.proto, which uses proto2 only features, by making them opaque
-    ///  bytes instead.
+    /// Serialized FileDescriptorProto messages. We avoid taking a dependency on
+    /// descriptor.proto, which uses proto2 only features, by making them opaque
+    /// bytes instead.
     /// </summary>
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public pbc::RepeatedField<pb::ByteString> FileDescriptorProto {
@@ -1012,8 +1012,8 @@ namespace Grpc.Reflection.V1Alpha {
   }
 
   /// <summary>
-  ///  A list of extension numbers sent by the server answering
-  ///  all_extension_numbers_of_type request.
+  /// A list of extension numbers sent by the server answering
+  /// all_extension_numbers_of_type request.
   /// </summary>
   public sealed partial class ExtensionNumberResponse : pb::IMessage<ExtensionNumberResponse> {
     private static readonly pb::MessageParser<ExtensionNumberResponse> _parser = new pb::MessageParser<ExtensionNumberResponse>(() => new ExtensionNumberResponse());
@@ -1052,8 +1052,8 @@ namespace Grpc.Reflection.V1Alpha {
     public const int BaseTypeNameFieldNumber = 1;
     private string baseTypeName_ = "";
     /// <summary>
-    ///  Full name of the base type, including the package name. The format
-    ///  is &lt;package>.&lt;type>
+    /// Full name of the base type, including the package name. The format
+    /// is &lt;package>.&lt;type>
     /// </summary>
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public string BaseTypeName {
@@ -1158,7 +1158,7 @@ namespace Grpc.Reflection.V1Alpha {
   }
 
   /// <summary>
-  ///  A list of ServiceResponse sent by the server answering list_services request.
+  /// A list of ServiceResponse sent by the server answering list_services request.
   /// </summary>
   public sealed partial class ListServiceResponse : pb::IMessage<ListServiceResponse> {
     private static readonly pb::MessageParser<ListServiceResponse> _parser = new pb::MessageParser<ListServiceResponse>(() => new ListServiceResponse());
@@ -1198,8 +1198,8 @@ namespace Grpc.Reflection.V1Alpha {
         = pb::FieldCodec.ForMessage(10, global::Grpc.Reflection.V1Alpha.ServiceResponse.Parser);
     private readonly pbc::RepeatedField<global::Grpc.Reflection.V1Alpha.ServiceResponse> service_ = new pbc::RepeatedField<global::Grpc.Reflection.V1Alpha.ServiceResponse>();
     /// <summary>
-    ///  The information of each service may be expanded in the future, so we use
-    ///  ServiceResponse message to encapsulate it.
+    /// The information of each service may be expanded in the future, so we use
+    /// ServiceResponse message to encapsulate it.
     /// </summary>
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public pbc::RepeatedField<global::Grpc.Reflection.V1Alpha.ServiceResponse> Service {
@@ -1274,8 +1274,8 @@ namespace Grpc.Reflection.V1Alpha {
   }
 
   /// <summary>
-  ///  The information of a single service used by ListServiceResponse to answer
-  ///  list_services request.
+  /// The information of a single service used by ListServiceResponse to answer
+  /// list_services request.
   /// </summary>
   public sealed partial class ServiceResponse : pb::IMessage<ServiceResponse> {
     private static readonly pb::MessageParser<ServiceResponse> _parser = new pb::MessageParser<ServiceResponse>(() => new ServiceResponse());
@@ -1313,8 +1313,8 @@ namespace Grpc.Reflection.V1Alpha {
     public const int NameFieldNumber = 1;
     private string name_ = "";
     /// <summary>
-    ///  Full name of a registered service, including its package name. The format
-    ///  is &lt;package>.&lt;service>
+    /// Full name of a registered service, including its package name. The format
+    /// is &lt;package>.&lt;service>
     /// </summary>
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public string Name {
@@ -1399,7 +1399,7 @@ namespace Grpc.Reflection.V1Alpha {
   }
 
   /// <summary>
-  ///  The error code and error message sent by the server when an error occurs.
+  /// The error code and error message sent by the server when an error occurs.
   /// </summary>
   public sealed partial class ErrorResponse : pb::IMessage<ErrorResponse> {
     private static readonly pb::MessageParser<ErrorResponse> _parser = new pb::MessageParser<ErrorResponse>(() => new ErrorResponse());
@@ -1438,7 +1438,7 @@ namespace Grpc.Reflection.V1Alpha {
     public const int ErrorCodeFieldNumber = 1;
     private int errorCode_;
     /// <summary>
-    ///  This field uses the error codes defined in grpc::StatusCode.
+    /// This field uses the error codes defined in grpc::StatusCode.
     /// </summary>
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     public int ErrorCode {
diff --git a/src/csharp/Grpc.Reflection/packages.config b/src/csharp/Grpc.Reflection/packages.config
index 5ab40b7a8c..eec292b306 100644
--- a/src/csharp/Grpc.Reflection/packages.config
+++ b/src/csharp/Grpc.Reflection/packages.config
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="utf-8"?>
 <packages>
-  <package id="Google.Protobuf" version="3.0.0" targetFramework="net45" />
+  <package id="Google.Protobuf" version="3.2.0" targetFramework="net45" />
   <package id="System.Interactive.Async" version="3.1.1" targetFramework="net45" />
 </packages>
\ No newline at end of file
diff --git a/src/csharp/Grpc.Reflection/project.json b/src/csharp/Grpc.Reflection/project.json
index bfc57661eb..8bfe722f78 100644
--- a/src/csharp/Grpc.Reflection/project.json
+++ b/src/csharp/Grpc.Reflection/project.json
@@ -22,15 +22,10 @@
   },
   "dependencies": {
     "Grpc.Core": "1.2.0-dev",
-    "Google.Protobuf": "3.0.0"
+    "Google.Protobuf": "3.2.0"
   },
   "frameworks": {
-    "net45": {
-      "frameworkAssemblies": {
-        "System.Runtime": "",
-        "System.IO": ""
-      }
-    },
+    "net45": {},
     "netstandard1.5": {
       "dependencies": {
         "NETStandard.Library": "1.6.0"
diff --git a/src/csharp/ext/grpc_csharp_ext.c b/src/csharp/ext/grpc_csharp_ext.c
index 6a241190b2..491df4de6a 100644
--- a/src/csharp/ext/grpc_csharp_ext.c
+++ b/src/csharp/ext/grpc_csharp_ext.c
@@ -1023,6 +1023,31 @@ GPR_EXPORT grpc_call_credentials *GPR_CALLTYPE grpcsharp_metadata_credentials_cr
   return grpc_metadata_credentials_create_from_plugin(plugin, NULL);
 }
 
+/* Auth context */
+
+GPR_EXPORT grpc_auth_context *GPR_CALLTYPE grpcsharp_call_auth_context(grpc_call *call) {
+  return grpc_call_auth_context(call);
+}
+
+GPR_EXPORT const char *GPR_CALLTYPE grpcsharp_auth_context_peer_identity_property_name(
+    const grpc_auth_context *ctx) {
+  return grpc_auth_context_peer_identity_property_name(ctx);
+}
+
+GPR_EXPORT grpc_auth_property_iterator GPR_CALLTYPE
+grpcsharp_auth_context_property_iterator(const grpc_auth_context *ctx) {
+  return grpc_auth_context_property_iterator(ctx);
+}
+
+GPR_EXPORT const grpc_auth_property *GPR_CALLTYPE grpcsharp_auth_property_iterator_next(
+    grpc_auth_property_iterator *it) {
+  return grpc_auth_property_iterator_next(it);
+}
+
+GPR_EXPORT void GPR_CALLTYPE grpcsharp_auth_context_release(grpc_auth_context *ctx) {
+  grpc_auth_context_release(ctx);
+}
+
 /* Logging */
 
 typedef void(GPR_CALLTYPE *grpcsharp_log_func)(const char *file, int32_t line,
diff --git a/src/csharp/tests.json b/src/csharp/tests.json
index 4ce6769eee..707d140f62 100644
--- a/src/csharp/tests.json
+++ b/src/csharp/tests.json
@@ -8,6 +8,8 @@
     "Grpc.Core.Internal.Tests.MetadataArraySafeHandleTest",
     "Grpc.Core.Internal.Tests.TimespecTest",
     "Grpc.Core.Tests.AppDomainUnloadTest",
+    "Grpc.Core.Tests.AuthContextTest",
+    "Grpc.Core.Tests.AuthPropertyTest",
     "Grpc.Core.Tests.CallCredentialsTest",
     "Grpc.Core.Tests.CallOptionsTest",
     "Grpc.Core.Tests.ChannelCredentialsTest",
@@ -20,7 +22,6 @@
     "Grpc.Core.Tests.HalfcloseTest",
     "Grpc.Core.Tests.MarshallingErrorsTest",
     "Grpc.Core.Tests.MetadataTest",
-    "Grpc.Core.Tests.NUnitVersionTest",
     "Grpc.Core.Tests.PerformanceTest",
     "Grpc.Core.Tests.PInvokeTest",
     "Grpc.Core.Tests.ResponseHeadersTest",
diff --git a/src/php/README.md b/src/php/README.md
index 821ea16aab..f08541f16c 100644
--- a/src/php/README.md
+++ b/src/php/README.md
@@ -158,7 +158,7 @@ $ composer install
 ### Protobuf compiler
 
 Again if you don't have it already, you need to install the protobuf compiler
-`protoc`, version 3.2.0+.
+`protoc`, version 3.1.0+ (the newer the better).
 
 If `protoc` hasn't been installed, you can download the `protoc` binaries from
 [the protocol buffers Github repository](https://github.com/google/protobuf/releases).
diff --git a/src/php/composer.json b/src/php/composer.json
index 8528304c81..491e34795a 100644
--- a/src/php/composer.json
+++ b/src/php/composer.json
@@ -5,7 +5,7 @@
   "version": "1.2.0",
   "require": {
     "php": ">=5.5.0",
-    "google/protobuf": "v3.1.0"
+    "google/protobuf": "^v3.1.0"
   },
   "require-dev": {
     "google/auth": "v0.9"
diff --git a/src/python/grpcio/grpc/__init__.py b/src/python/grpcio/grpc/__init__.py
index b64a708cc7..a4481b2ac3 100644
--- a/src/python/grpcio/grpc/__init__.py
+++ b/src/python/grpcio/grpc/__init__.py
@@ -1004,7 +1004,7 @@ def unary_unary_rpc_method_handler(behavior,
     An RpcMethodHandler for a unary-unary RPC method constructed from the given
       parameters.
   """
-    from grpc import _utilities
+    from grpc import _utilities  # pylint: disable=cyclic-import
     return _utilities.RpcMethodHandler(False, False, request_deserializer,
                                        response_serializer, behavior, None,
                                        None, None)
@@ -1025,7 +1025,7 @@ def unary_stream_rpc_method_handler(behavior,
     An RpcMethodHandler for a unary-stream RPC method constructed from the
       given parameters.
   """
-    from grpc import _utilities
+    from grpc import _utilities  # pylint: disable=cyclic-import
     return _utilities.RpcMethodHandler(False, True, request_deserializer,
                                        response_serializer, None, behavior,
                                        None, None)
@@ -1046,7 +1046,7 @@ def stream_unary_rpc_method_handler(behavior,
     An RpcMethodHandler for a stream-unary RPC method constructed from the
       given parameters.
   """
-    from grpc import _utilities
+    from grpc import _utilities  # pylint: disable=cyclic-import
     return _utilities.RpcMethodHandler(True, False, request_deserializer,
                                        response_serializer, None, None,
                                        behavior, None)
@@ -1068,7 +1068,7 @@ def stream_stream_rpc_method_handler(behavior,
     An RpcMethodHandler for a stream-stream RPC method constructed from the
       given parameters.
   """
-    from grpc import _utilities
+    from grpc import _utilities  # pylint: disable=cyclic-import
     return _utilities.RpcMethodHandler(True, True, request_deserializer,
                                        response_serializer, None, None, None,
                                        behavior)
@@ -1085,7 +1085,7 @@ def method_handlers_generic_handler(service, method_handlers):
   Returns:
     A GenericRpcHandler constructed from the given parameters.
   """
-    from grpc import _utilities
+    from grpc import _utilities  # pylint: disable=cyclic-import
     return _utilities.DictionaryGenericHandler(service, method_handlers)
 
 
@@ -1124,7 +1124,7 @@ def metadata_call_credentials(metadata_plugin, name=None):
   Returns:
     A CallCredentials.
   """
-    from grpc import _plugin_wrapping
+    from grpc import _plugin_wrapping  # pylint: disable=cyclic-import
     if name is None:
         try:
             effective_name = metadata_plugin.__name__
@@ -1147,7 +1147,7 @@ def access_token_call_credentials(access_token):
   Returns:
     A CallCredentials.
   """
-    from grpc import _auth
+    from grpc import _auth  # pylint: disable=cyclic-import
     return metadata_call_credentials(
         _auth.AccessTokenCallCredentials(access_token))
 
@@ -1161,7 +1161,7 @@ def composite_call_credentials(*call_credentials):
   Returns:
     A CallCredentials object composed of the given CallCredentials objects.
   """
-    from grpc import _credential_composition
+    from grpc import _credential_composition  # pylint: disable=cyclic-import
     cygrpc_call_credentials = tuple(
         single_call_credentials._credentials
         for single_call_credentials in call_credentials)
@@ -1180,7 +1180,7 @@ def composite_channel_credentials(channel_credentials, *call_credentials):
     A ChannelCredentials composed of the given ChannelCredentials and
       CallCredentials objects.
   """
-    from grpc import _credential_composition
+    from grpc import _credential_composition  # pylint: disable=cyclic-import
     cygrpc_call_credentials = tuple(
         single_call_credentials._credentials
         for single_call_credentials in call_credentials)
@@ -1237,7 +1237,7 @@ def channel_ready_future(channel):
     A Future that matures when the given Channel has connectivity
       ChannelConnectivity.READY.
   """
-    from grpc import _utilities
+    from grpc import _utilities  # pylint: disable=cyclic-import
     return _utilities.channel_ready_future(channel)
 
 
@@ -1252,7 +1252,7 @@ def insecure_channel(target, options=None):
   Returns:
     A Channel to the target through which RPCs may be conducted.
   """
-    from grpc import _channel
+    from grpc import _channel  # pylint: disable=cyclic-import
     return _channel.Channel(target, () if options is None else options, None)
 
 
@@ -1268,7 +1268,7 @@ def secure_channel(target, credentials, options=None):
   Returns:
     A Channel to the target through which RPCs may be conducted.
   """
-    from grpc import _channel
+    from grpc import _channel  # pylint: disable=cyclic-import
     return _channel.Channel(target, () if options is None else options,
                             credentials._credentials)
 
@@ -1290,7 +1290,7 @@ def server(thread_pool, handlers=None, options=None):
   Returns:
     A Server with which RPCs can be serviced.
   """
-    from grpc import _server
+    from grpc import _server  # pylint: disable=cyclic-import
     return _server.Server(thread_pool, () if handlers is None else handlers, ()
                           if options is None else options)
 
diff --git a/src/python/grpcio/grpc/_auth.py b/src/python/grpcio/grpc/_auth.py
index 21131f85f1..cb7c6fe4fd 100644
--- a/src/python/grpcio/grpc/_auth.py
+++ b/src/python/grpcio/grpc/_auth.py
@@ -39,6 +39,19 @@ def _sign_request(callback, token, error):
     callback(metadata, error)
 
 
+def _create_get_token_callback(callback):
+
+    def get_token_callback(future):
+        try:
+            access_token = future.result().access_token
+        except Exception as exception:  # pylint: disable=broad-except
+            _sign_request(callback, None, exception)
+        else:
+            _sign_request(callback, access_token, None)
+
+    return get_token_callback
+
+
 class GoogleCallCredentials(grpc.AuthMetadataPlugin):
     """Metadata wrapper for GoogleCredentials from the oauth2client library."""
 
@@ -59,16 +72,7 @@ class GoogleCallCredentials(grpc.AuthMetadataPlugin):
                 additional_claims={'aud': context.service_url})
         else:
             future = self._pool.submit(self._credentials.get_access_token)
-        future.add_done_callback(
-            lambda x: self._get_token_callback(callback, x))
-
-    def _get_token_callback(self, callback, future):
-        try:
-            access_token = future.result().access_token
-        except Exception as e:
-            _sign_request(callback, None, e)
-        else:
-            _sign_request(callback, access_token, None)
+        future.add_done_callback(_create_get_token_callback(callback))
 
     def __del__(self):
         self._pool.shutdown(wait=False)
diff --git a/src/python/grpcio/grpc/_channel.py b/src/python/grpcio/grpc/_channel.py
index af86f5eabe..4316449ac6 100644
--- a/src/python/grpcio/grpc/_channel.py
+++ b/src/python/grpcio/grpc/_channel.py
@@ -200,7 +200,7 @@ def _consume_request_iterator(request_iterator, state, call,
                 request = next(request_iterator)
             except StopIteration:
                 break
-            except Exception as e:
+            except Exception:  # pylint: disable=broad-except
                 logging.exception("Exception iterating requests!")
                 call.cancel()
                 _abort(state, grpc.StatusCode.UNKNOWN,
@@ -237,7 +237,7 @@ def _consume_request_iterator(request_iterator, state, call,
                     cygrpc.Operations(operations), event_handler)
                 state.due.add(cygrpc.OperationType.send_close_from_client)
 
-    def stop_consumption_thread(timeout):
+    def stop_consumption_thread(timeout):  # pylint: disable=unused-argument
         with state.condition:
             if state.code is None:
                 call.cancel()
@@ -387,13 +387,14 @@ class _Rendezvous(grpc.RpcError, grpc.Future, grpc.Call):
         with self._state.condition:
             while self._state.initial_metadata is None:
                 self._state.condition.wait()
-            return _common.application_metadata(self._state.initial_metadata)
+            return _common.to_application_metadata(self._state.initial_metadata)
 
     def trailing_metadata(self):
         with self._state.condition:
             while self._state.trailing_metadata is None:
                 self._state.condition.wait()
-            return _common.application_metadata(self._state.trailing_metadata)
+            return _common.to_application_metadata(
+                self._state.trailing_metadata)
 
     def code(self):
         with self._state.condition:
@@ -473,7 +474,7 @@ class _UnaryUnaryMultiCallable(grpc.UnaryUnaryMultiCallable):
             state = _RPCState(_UNARY_UNARY_INITIAL_DUE, None, None, None, None)
             operations = (
                 cygrpc.operation_send_initial_metadata(
-                    _common.cygrpc_metadata(metadata), _EMPTY_FLAGS),
+                    _common.to_cygrpc_metadata(metadata), _EMPTY_FLAGS),
                 cygrpc.operation_send_message(serialized_request, _EMPTY_FLAGS),
                 cygrpc.operation_send_close_from_client(_EMPTY_FLAGS),
                 cygrpc.operation_receive_initial_metadata(_EMPTY_FLAGS),
@@ -563,7 +564,7 @@ class _UnaryStreamMultiCallable(grpc.UnaryStreamMultiCallable):
                     )), event_handler)
                 operations = (
                     cygrpc.operation_send_initial_metadata(
-                        _common.cygrpc_metadata(metadata),
+                        _common.to_cygrpc_metadata(metadata),
                         _EMPTY_FLAGS), cygrpc.operation_send_message(
                             serialized_request, _EMPTY_FLAGS),
                     cygrpc.operation_send_close_from_client(_EMPTY_FLAGS),
@@ -603,7 +604,7 @@ class _StreamUnaryMultiCallable(grpc.StreamUnaryMultiCallable):
                 None)
             operations = (
                 cygrpc.operation_send_initial_metadata(
-                    _common.cygrpc_metadata(metadata), _EMPTY_FLAGS),
+                    _common.to_cygrpc_metadata(metadata), _EMPTY_FLAGS),
                 cygrpc.operation_receive_message(_EMPTY_FLAGS),
                 cygrpc.operation_receive_status_on_client(_EMPTY_FLAGS),)
             call_error = call.start_client_batch(
@@ -657,7 +658,7 @@ class _StreamUnaryMultiCallable(grpc.StreamUnaryMultiCallable):
                 event_handler)
             operations = (
                 cygrpc.operation_send_initial_metadata(
-                    _common.cygrpc_metadata(metadata), _EMPTY_FLAGS),
+                    _common.to_cygrpc_metadata(metadata), _EMPTY_FLAGS),
                 cygrpc.operation_receive_message(_EMPTY_FLAGS),
                 cygrpc.operation_receive_status_on_client(_EMPTY_FLAGS),)
             call_error = call.start_client_batch(
@@ -700,7 +701,7 @@ class _StreamStreamMultiCallable(grpc.StreamStreamMultiCallable):
                 event_handler)
             operations = (
                 cygrpc.operation_send_initial_metadata(
-                    _common.cygrpc_metadata(metadata), _EMPTY_FLAGS),
+                    _common.to_cygrpc_metadata(metadata), _EMPTY_FLAGS),
                 cygrpc.operation_receive_status_on_client(_EMPTY_FLAGS),)
             call_error = call.start_client_batch(
                 cygrpc.Operations(operations), event_handler)
@@ -735,7 +736,7 @@ def _run_channel_spin_thread(state):
                         state.managed_calls = None
                         return
 
-    def stop_channel_spin(timeout):
+    def stop_channel_spin(timeout):  # pylint: disable=unused-argument
         with state.lock:
             if state.managed_calls is not None:
                 for call in state.managed_calls:
@@ -876,12 +877,8 @@ def _moot(state):
 def _subscribe(state, callback, try_to_connect):
     with state.lock:
         if not state.callbacks_and_connectivities and not state.polling:
-
-            def cancel_all_subscriptions(timeout):
-                _moot(state)
-
             polling_thread = _common.CleanupThread(
-                cancel_all_subscriptions,
+                lambda timeout: _moot(state),
                 target=_poll_connectivity,
                 args=(state, state.channel, bool(try_to_connect)))
             polling_thread.start()
diff --git a/src/python/grpcio/grpc/_common.py b/src/python/grpcio/grpc/_common.py
index 6879e1780b..2e369013f5 100644
--- a/src/python/grpcio/grpc/_common.py
+++ b/src/python/grpcio/grpc/_common.py
@@ -97,22 +97,22 @@ def decode(b):
 
 
 def channel_args(options):
-    channel_args = []
+    cygrpc_args = []
     for key, value in options:
         if isinstance(value, six.string_types):
-            channel_args.append(cygrpc.ChannelArg(encode(key), encode(value)))
+            cygrpc_args.append(cygrpc.ChannelArg(encode(key), encode(value)))
         else:
-            channel_args.append(cygrpc.ChannelArg(encode(key), value))
-    return cygrpc.ChannelArgs(channel_args)
+            cygrpc_args.append(cygrpc.ChannelArg(encode(key), value))
+    return cygrpc.ChannelArgs(cygrpc_args)
 
 
-def cygrpc_metadata(application_metadata):
+def to_cygrpc_metadata(application_metadata):
     return EMPTY_METADATA if application_metadata is None else cygrpc.Metadata(
         cygrpc.Metadatum(encode(key), encode(value))
         for key, value in application_metadata)
 
 
-def application_metadata(cygrpc_metadata):
+def to_application_metadata(cygrpc_metadata):
     if cygrpc_metadata is None:
         return ()
     else:
diff --git a/src/python/grpcio/grpc/_plugin_wrapping.py b/src/python/grpcio/grpc/_plugin_wrapping.py
index 69c46aa546..1e44561c97 100644
--- a/src/python/grpcio/grpc/_plugin_wrapping.py
+++ b/src/python/grpcio/grpc/_plugin_wrapping.py
@@ -66,9 +66,9 @@ class _WrappedCygrpcCallback(object):
 
     def _invoke_success(self, metadata):
         try:
-            cygrpc_metadata = _common.cygrpc_metadata(metadata)
-        except Exception as error:
-            self._invoke_failure(error)
+            cygrpc_metadata = _common.to_cygrpc_metadata(metadata)
+        except Exception as exception:  # pylint: disable=broad-except
+            self._invoke_failure(exception)
             return
         self.cygrpc_callback(cygrpc_metadata, cygrpc.StatusCode.ok, b'')
 
diff --git a/src/python/grpcio/grpc/_server.py b/src/python/grpcio/grpc/_server.py
index b8e7ea17f7..84e096d4c0 100644
--- a/src/python/grpcio/grpc/_server.py
+++ b/src/python/grpcio/grpc/_server.py
@@ -142,14 +142,14 @@ def _abort(state, call, code, details):
         effective_details = details if state.details is None else state.details
         if state.initial_metadata_allowed:
             operations = (cygrpc.operation_send_initial_metadata(
-                _common.EMPTY_METADATA, _EMPTY_FLAGS),
-                          cygrpc.operation_send_status_from_server(
-                              _common.cygrpc_metadata(state.trailing_metadata),
-                              effective_code, effective_details, _EMPTY_FLAGS),)
+                _common.EMPTY_METADATA,
+                _EMPTY_FLAGS), cygrpc.operation_send_status_from_server(
+                    _common.to_cygrpc_metadata(state.trailing_metadata),
+                    effective_code, effective_details, _EMPTY_FLAGS),)
             token = _SEND_INITIAL_METADATA_AND_SEND_STATUS_FROM_SERVER_TOKEN
         else:
             operations = (cygrpc.operation_send_status_from_server(
-                _common.cygrpc_metadata(state.trailing_metadata),
+                _common.to_cygrpc_metadata(state.trailing_metadata),
                 effective_code, effective_details, _EMPTY_FLAGS),)
             token = _SEND_STATUS_FROM_SERVER_TOKEN
         call.start_server_batch(
@@ -250,7 +250,7 @@ class _Context(grpc.ServicerContext):
             self._state.disable_next_compression = True
 
     def invocation_metadata(self):
-        return _common.application_metadata(self._rpc_event.request_metadata)
+        return _common.to_application_metadata(self._rpc_event.request_metadata)
 
     def peer(self):
         return _common.decode(self._rpc_event.operation_call.peer())
@@ -262,7 +262,8 @@ class _Context(grpc.ServicerContext):
             else:
                 if self._state.initial_metadata_allowed:
                     operation = cygrpc.operation_send_initial_metadata(
-                        _common.cygrpc_metadata(initial_metadata), _EMPTY_FLAGS)
+                        _common.to_cygrpc_metadata(initial_metadata),
+                        _EMPTY_FLAGS)
                     self._rpc_event.operation_call.start_server_batch(
                         cygrpc.Operations((operation,)),
                         _send_initial_metadata(self._state))
@@ -273,7 +274,7 @@ class _Context(grpc.ServicerContext):
 
     def set_trailing_metadata(self, trailing_metadata):
         with self._state.condition:
-            self._state.trailing_metadata = _common.cygrpc_metadata(
+            self._state.trailing_metadata = _common.to_cygrpc_metadata(
                 trailing_metadata)
 
     def set_code(self, code):
@@ -342,7 +343,7 @@ def _unary_request(rpc_event, state, request_deserializer):
             if state.client is _CANCELLED or state.statused:
                 return None
             else:
-                start_server_batch_result = rpc_event.operation_call.start_server_batch(
+                rpc_event.operation_call.start_server_batch(
                     cygrpc.Operations(
                         (cygrpc.operation_receive_message(_EMPTY_FLAGS),)),
                     _receive_message(state, rpc_event.operation_call,
@@ -436,7 +437,8 @@ def _send_response(rpc_event, state, serialized_response):
 def _status(rpc_event, state, serialized_response):
     with state.condition:
         if state.client is not _CANCELLED:
-            trailing_metadata = _common.cygrpc_metadata(state.trailing_metadata)
+            trailing_metadata = _common.to_cygrpc_metadata(
+                state.trailing_metadata)
             code = _completion_code(state)
             details = _details(state)
             operations = [
diff --git a/src/python/grpcio/grpc/beta/_client_adaptations.py b/src/python/grpcio/grpc/beta/_client_adaptations.py
index b53395e2a2..3c69acc019 100644
--- a/src/python/grpcio/grpc/beta/_client_adaptations.py
+++ b/src/python/grpcio/grpc/beta/_client_adaptations.py
@@ -30,12 +30,13 @@
 
 import grpc
 from grpc import _common
-from grpc._cython import cygrpc
 from grpc.beta import interfaces
 from grpc.framework.common import cardinality
 from grpc.framework.foundation import future
 from grpc.framework.interfaces.face import face
 
+# pylint: disable=too-many-arguments,too-many-locals,unused-argument
+
 _STATUS_CODE_TO_ABORTION_KIND_AND_ABORTION_ERROR_CLASS = {
     grpc.StatusCode.CANCELLED: (face.Abortion.Kind.CANCELLED,
                                 face.CancellationError),
@@ -621,8 +622,8 @@ class _GenericStub(face.GenericStub):
 
 class _DynamicStub(face.DynamicStub):
 
-    def __init__(self, generic_stub, group, cardinalities):
-        self._generic_stub = generic_stub
+    def __init__(self, backing_generic_stub, group, cardinalities):
+        self._generic_stub = backing_generic_stub
         self._group = group
         self._cardinalities = cardinalities
 
diff --git a/src/python/grpcio/grpc/beta/_connectivity_channel.py b/src/python/grpcio/grpc/beta/_connectivity_channel.py
deleted file mode 100644
index bfb847f80a..0000000000
--- a/src/python/grpcio/grpc/beta/_connectivity_channel.py
+++ /dev/null
@@ -1,159 +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.
-"""Affords a connectivity-state-listenable channel."""
-
-import threading
-import time
-
-from grpc._adapter import _low
-from grpc._adapter import _types
-from grpc.beta import interfaces
-from grpc.framework.foundation import callable_util
-
-_CHANNEL_SUBSCRIPTION_CALLBACK_ERROR_LOG_MESSAGE = (
-    'Exception calling channel subscription callback!')
-
-_LOW_CONNECTIVITY_STATE_TO_CHANNEL_CONNECTIVITY = {
-    state: connectivity
-    for state, connectivity in zip(_types.ConnectivityState,
-                                   interfaces.ChannelConnectivity)
-}
-
-
-class ConnectivityChannel(object):
-
-    def __init__(self, low_channel):
-        self._lock = threading.Lock()
-        self._low_channel = low_channel
-
-        self._polling = False
-        self._connectivity = None
-        self._try_to_connect = False
-        self._callbacks_and_connectivities = []
-        self._delivering = False
-
-    def _deliveries(self, connectivity):
-        callbacks_needing_update = []
-        for callback_and_connectivity in self._callbacks_and_connectivities:
-            callback, callback_connectivity = callback_and_connectivity
-            if callback_connectivity is not connectivity:
-                callbacks_needing_update.append(callback)
-                callback_and_connectivity[1] = connectivity
-        return callbacks_needing_update
-
-    def _deliver(self, initial_connectivity, initial_callbacks):
-        connectivity = initial_connectivity
-        callbacks = initial_callbacks
-        while True:
-            for callback in callbacks:
-                callable_util.call_logging_exceptions(
-                    callback, _CHANNEL_SUBSCRIPTION_CALLBACK_ERROR_LOG_MESSAGE,
-                    connectivity)
-            with self._lock:
-                callbacks = self._deliveries(self._connectivity)
-                if callbacks:
-                    connectivity = self._connectivity
-                else:
-                    self._delivering = False
-                    return
-
-    def _spawn_delivery(self, connectivity, callbacks):
-        delivering_thread = threading.Thread(
-            target=self._deliver, args=(connectivity, callbacks,))
-        delivering_thread.start()
-        self._delivering = True
-
-    # TODO(issue 3064): Don't poll.
-    def _poll_connectivity(self, low_channel, initial_try_to_connect):
-        try_to_connect = initial_try_to_connect
-        low_connectivity = low_channel.check_connectivity_state(try_to_connect)
-        with self._lock:
-            self._connectivity = _LOW_CONNECTIVITY_STATE_TO_CHANNEL_CONNECTIVITY[
-                low_connectivity]
-            callbacks = tuple(
-                callback
-                for callback, unused_but_known_to_be_none_connectivity in
-                self._callbacks_and_connectivities)
-            for callback_and_connectivity in self._callbacks_and_connectivities:
-                callback_and_connectivity[1] = self._connectivity
-            if callbacks:
-                self._spawn_delivery(self._connectivity, callbacks)
-        completion_queue = _low.CompletionQueue()
-        while True:
-            low_channel.watch_connectivity_state(low_connectivity,
-                                                 time.time() + 0.2,
-                                                 completion_queue, None)
-            event = completion_queue.next()
-            with self._lock:
-                if not self._callbacks_and_connectivities and not self._try_to_connect:
-                    self._polling = False
-                    self._connectivity = None
-                    completion_queue.shutdown()
-                    break
-                try_to_connect = self._try_to_connect
-                self._try_to_connect = False
-            if event.success or try_to_connect:
-                low_connectivity = low_channel.check_connectivity_state(
-                    try_to_connect)
-                with self._lock:
-                    self._connectivity = _LOW_CONNECTIVITY_STATE_TO_CHANNEL_CONNECTIVITY[
-                        low_connectivity]
-                    if not self._delivering:
-                        callbacks = self._deliveries(self._connectivity)
-                        if callbacks:
-                            self._spawn_delivery(self._connectivity, callbacks)
-
-    def subscribe(self, callback, try_to_connect):
-        with self._lock:
-            if not self._callbacks_and_connectivities and not self._polling:
-                polling_thread = threading.Thread(
-                    target=self._poll_connectivity,
-                    args=(self._low_channel, bool(try_to_connect)))
-                polling_thread.start()
-                self._polling = True
-                self._callbacks_and_connectivities.append([callback, None])
-            elif not self._delivering and self._connectivity is not None:
-                self._spawn_delivery(self._connectivity, (callback,))
-                self._try_to_connect |= bool(try_to_connect)
-                self._callbacks_and_connectivities.append(
-                    [callback, self._connectivity])
-            else:
-                self._try_to_connect |= bool(try_to_connect)
-                self._callbacks_and_connectivities.append([callback, None])
-
-    def unsubscribe(self, callback):
-        with self._lock:
-            for index, (subscribed_callback, unused_connectivity
-                       ) in enumerate(self._callbacks_and_connectivities):
-                if callback == subscribed_callback:
-                    self._callbacks_and_connectivities.pop(index)
-                    break
-
-    def low_channel(self):
-        return self._low_channel
diff --git a/src/python/grpcio/grpc/beta/_server_adaptations.py b/src/python/grpcio/grpc/beta/_server_adaptations.py
index 174af2d642..cf10c26d2f 100644
--- a/src/python/grpcio/grpc/beta/_server_adaptations.py
+++ b/src/python/grpcio/grpc/beta/_server_adaptations.py
@@ -41,6 +41,8 @@ from grpc.framework.foundation import logging_pool
 from grpc.framework.foundation import stream
 from grpc.framework.interfaces.face import face
 
+# pylint: disable=too-many-return-statements
+
 _DEFAULT_POOL_SIZE = 8
 
 
@@ -78,7 +80,7 @@ class _FaceServicerContext(face.ServicerContext):
         return _ServerProtocolContext(self._servicer_context)
 
     def invocation_metadata(self):
-        return _common.cygrpc_metadata(
+        return _common.to_cygrpc_metadata(
             self._servicer_context.invocation_metadata())
 
     def initial_metadata(self, initial_metadata):
@@ -179,7 +181,7 @@ def _run_request_pipe_thread(request_iterator, request_consumer,
                 return
         request_consumer.terminate()
 
-    def stop_request_pipe(timeout):
+    def stop_request_pipe(timeout):  # pylint: disable=unused-argument
         thread_joined.set()
 
     request_pipe_thread = _common.CleanupThread(
@@ -351,27 +353,27 @@ class _GenericRpcHandler(grpc.GenericRpcHandler):
 
 class _Server(interfaces.Server):
 
-    def __init__(self, server):
-        self._server = server
+    def __init__(self, grpc_server):
+        self._grpc_server = grpc_server
 
     def add_insecure_port(self, address):
-        return self._server.add_insecure_port(address)
+        return self._grpc_server.add_insecure_port(address)
 
     def add_secure_port(self, address, server_credentials):
-        return self._server.add_secure_port(address, server_credentials)
+        return self._grpc_server.add_secure_port(address, server_credentials)
 
     def start(self):
-        self._server.start()
+        self._grpc_server.start()
 
     def stop(self, grace):
-        return self._server.stop(grace)
+        return self._grpc_server.stop(grace)
 
     def __enter__(self):
-        self._server.start()
+        self._grpc_server.start()
         return self
 
     def __exit__(self, exc_type, exc_val, exc_tb):
-        self._server.stop(None)
+        self._grpc_server.stop(None)
         return False
 
 
diff --git a/src/python/grpcio/grpc/beta/implementations.py b/src/python/grpcio/grpc/beta/implementations.py
index 7093852278..113fd38f8a 100644
--- a/src/python/grpcio/grpc/beta/implementations.py
+++ b/src/python/grpcio/grpc/beta/implementations.py
@@ -29,19 +29,20 @@
 """Entry points into the Beta API of gRPC Python."""
 
 # threading is referenced from specification in this module.
-import abc
-import enum
 import threading  # pylint: disable=unused-import
 
-# cardinality and face are referenced from specification in this module.
+# interfaces, cardinality, and face are referenced from specification in this
+# module.
 import grpc
 from grpc import _auth
 from grpc.beta import _client_adaptations
 from grpc.beta import _server_adaptations
-from grpc.beta import interfaces
+from grpc.beta import interfaces  # pylint: disable=unused-import
 from grpc.framework.common import cardinality  # pylint: disable=unused-import
 from grpc.framework.interfaces.face import face  # pylint: disable=unused-import
 
+# pylint: disable=too-many-arguments
+
 ChannelCredentials = grpc.ChannelCredentials
 ssl_channel_credentials = grpc.ssl_channel_credentials
 CallCredentials = grpc.CallCredentials
@@ -218,7 +219,7 @@ def dynamic_stub(channel, service, cardinalities, options=None):
   Returns:
     A face.DynamicStub with which RPCs can be invoked.
   """
-    effective_options = StubOptions() if options is None else options
+    effective_options = _EMPTY_STUB_OPTIONS if options is None else options
     return _client_adaptations.dynamic_stub(
         channel._channel,  # pylint: disable=protected-access
         service,
diff --git a/src/python/grpcio/grpc/framework/foundation/logging_pool.py b/src/python/grpcio/grpc/framework/foundation/logging_pool.py
index 7ee37373fa..0912fba139 100644
--- a/src/python/grpcio/grpc/framework/foundation/logging_pool.py
+++ b/src/python/grpcio/grpc/framework/foundation/logging_pool.py
@@ -39,7 +39,7 @@ def _wrap(behavior):
     def _wrapping(*args, **kwargs):
         try:
             return behavior(*args, **kwargs)
-        except Exception as e:
+        except Exception:
             logging.exception(
                 'Unexpected exception from %s executed in logging pool!',
                 behavior)
diff --git a/src/python/grpcio/grpc/framework/interfaces/base/base.py b/src/python/grpcio/grpc/framework/interfaces/base/base.py
index cb3328296c..aa80e65f57 100644
--- a/src/python/grpcio/grpc/framework/interfaces/base/base.py
+++ b/src/python/grpcio/grpc/framework/interfaces/base/base.py
@@ -46,26 +46,29 @@ import six
 # abandonment is referenced from specification in this module.
 from grpc.framework.foundation import abandonment  # pylint: disable=unused-import
 
+# pylint: disable=too-many-arguments
+
 
 class NoSuchMethodError(Exception):
     """Indicates that an unrecognized operation has been called.
 
-  Attributes:
-    code: A code value to communicate to the other side of the operation along
-      with indication of operation termination. May be None.
-    details: A details value to communicate to the other side of the operation
-      along with indication of operation termination. May be None.
-  """
-
-    def __init__(self, code, details):
-        """Constructor.
-
-    Args:
+    Attributes:
       code: A code value to communicate to the other side of the operation
         along with indication of operation termination. May be None.
       details: A details value to communicate to the other side of the
         operation along with indication of operation termination. May be None.
     """
+
+    def __init__(self, code, details):
+        """Constructor.
+
+        Args:
+          code: A code value to communicate to the other side of the operation
+            along with indication of operation termination. May be None.
+          details: A details value to communicate to the other side of the
+            operation along with indication of operation termination. May be None.
+        """
+        super(NoSuchMethodError, self).__init__()
         self.code = code
         self.details = details
 
diff --git a/src/python/grpcio/grpc/framework/interfaces/face/face.py b/src/python/grpcio/grpc/framework/interfaces/face/face.py
index 6c7e2a3af6..c6c44fe4e4 100644
--- a/src/python/grpcio/grpc/framework/interfaces/face/face.py
+++ b/src/python/grpcio/grpc/framework/interfaces/face/face.py
@@ -42,6 +42,8 @@ from grpc.framework.foundation import abandonment  # pylint: disable=unused-impo
 from grpc.framework.foundation import future  # pylint: disable=unused-import
 from grpc.framework.foundation import stream  # pylint: disable=unused-import
 
+# pylint: disable=too-many-arguments
+
 
 class NoSuchMethodError(Exception):
     """Raised by customer code to indicate an unrecognized method.
diff --git a/src/python/grpcio_health_checking/setup.py b/src/python/grpcio_health_checking/setup.py
index 072c3263c6..52ee98a2d5 100644
--- a/src/python/grpcio_health_checking/setup.py
+++ b/src/python/grpcio_health_checking/setup.py
@@ -47,7 +47,7 @@ PACKAGE_DIRECTORIES = {
 SETUP_REQUIRES = (
     'grpcio-tools>={version}'.format(version=grpc_version.VERSION),)
 
-INSTALL_REQUIRES = ('protobuf>=3.0.0',
+INSTALL_REQUIRES = ('protobuf>=3.2.0',
                     'grpcio>={version}'.format(version=grpc_version.VERSION),)
 
 COMMAND_CLASS = {
diff --git a/src/python/grpcio_reflection/setup.py b/src/python/grpcio_reflection/setup.py
index 19aafe443a..e85092db57 100644
--- a/src/python/grpcio_reflection/setup.py
+++ b/src/python/grpcio_reflection/setup.py
@@ -47,7 +47,7 @@ PACKAGE_DIRECTORIES = {
 SETUP_REQUIRES = (
     'grpcio-tools>={version}'.format(version=grpc_version.VERSION),)
 
-INSTALL_REQUIRES = ('protobuf>=3.0.0',
+INSTALL_REQUIRES = ('protobuf>=3.2.0',
                     'grpcio>={version}'.format(version=grpc_version.VERSION),)
 
 COMMAND_CLASS = {
diff --git a/src/python/grpcio_tests/setup.py b/src/python/grpcio_tests/setup.py
index b0c73fc575..b9f0264dae 100644
--- a/src/python/grpcio_tests/setup.py
+++ b/src/python/grpcio_tests/setup.py
@@ -56,7 +56,7 @@ INSTALL_REQUIRES = (
     'grpcio>={version}'.format(version=grpc_version.VERSION),
     'grpcio-tools>={version}'.format(version=grpc_version.VERSION),
     'grpcio-health-checking>={version}'.format(version=grpc_version.VERSION),
-    'oauth2client>=1.4.7', 'protobuf>=3.0.0', 'six>=1.10',)
+    'oauth2client>=1.4.7', 'protobuf>=3.2.0', 'six>=1.10',)
 
 COMMAND_CLASS = {
     # Run `preprocess` *before* doing any packaging!
diff --git a/src/python/grpcio_tests/tests/http2/negative_http2_client.py b/src/python/grpcio_tests/tests/http2/negative_http2_client.py
index b8adf093a5..b184e62cfd 100644
--- a/src/python/grpcio_tests/tests/http2/negative_http2_client.py
+++ b/src/python/grpcio_tests/tests/http2/negative_http2_client.py
@@ -31,6 +31,7 @@
 import argparse
 
 import grpc
+import time
 from src.proto.grpc.testing import test_pb2
 from src.proto.grpc.testing import messages_pb2
 
@@ -75,6 +76,7 @@ def _goaway(stub):
     first_response = stub.UnaryCall(_SIMPLE_REQUEST)
     _validate_payload_type_and_length(first_response, messages_pb2.COMPRESSABLE,
                                       _RESPONSE_SIZE)
+    time.sleep(1)
     second_response = stub.UnaryCall(_SIMPLE_REQUEST)
     _validate_payload_type_and_length(second_response,
                                       messages_pb2.COMPRESSABLE, _RESPONSE_SIZE)
diff --git a/src/python/grpcio_tests/tests/unit/_thread_cleanup_test.py b/src/python/grpcio_tests/tests/unit/_thread_cleanup_test.py
index be3522f46f..eb5f459848 100644
--- a/src/python/grpcio_tests/tests/unit/_thread_cleanup_test.py
+++ b/src/python/grpcio_tests/tests/unit/_thread_cleanup_test.py
@@ -35,8 +35,8 @@ import unittest
 from grpc import _common
 
 _SHORT_TIME = 0.5
-_LONG_TIME = 2.0
-_EPSILON = 0.1
+_LONG_TIME = 5.0
+_EPSILON = 0.5
 
 
 def cleanup(timeout):
diff --git a/src/ruby/ext/grpc/extconf.rb b/src/ruby/ext/grpc/extconf.rb
index b379664bab..ecb66239b9 100644
--- a/src/ruby/ext/grpc/extconf.rb
+++ b/src/ruby/ext/grpc/extconf.rb
@@ -27,6 +27,7 @@
 # (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 # OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
+require 'etc'
 require 'mkmf'
 
 LIBDIR = RbConfig::CONFIG['libdir']
@@ -80,7 +81,9 @@ ENV['BUILDDIR'] = output_dir
 
 unless windows
   puts 'Building internal gRPC into ' + grpc_lib_dir
-  system("make -j -C #{grpc_root} #{grpc_lib_dir}/libgrpc.a CONFIG=#{grpc_config}")
+  nproc = 4
+  nproc = Etc.nprocessors * 2 if Etc.respond_to? :nprocessors
+  system("make -j#{nproc} -C #{grpc_root} #{grpc_lib_dir}/libgrpc.a CONFIG=#{grpc_config}")
   exit 1 unless $? == 0
 end