65 files changed, 383 insertions, 283 deletions

diff --git a/src/core/ext/transport/chttp2/client/insecure/README.md b/src/core/ext/transport/chttp2/client/insecure/README.md
new file mode 100644
index 0000000000..fa11463388
--- /dev/null
+++ b/src/core/ext/transport/chttp2/client/insecure/README.md
@@ -0,0 +1 @@
+Plugin for creating insecure channels using chttp2
diff --git a/src/core/lib/surface/channel_create.c b/src/core/ext/transport/chttp2/client/insecure/channel_create.c
index e8777ce816..cf987a02e0 100644
--- a/src/core/lib/surface/channel_create.c
+++ b/src/core/ext/transport/chttp2/client/insecure/channel_create.c
@@ -40,6 +40,7 @@
 #include <grpc/support/slice.h>
 #include <grpc/support/slice_buffer.h>
 
+#include "src/core/ext/transport/chttp2/transport/chttp2_transport.h"
 #include "src/core/lib/census/grpc_filter.h"
 #include "src/core/lib/channel/channel_args.h"
 #include "src/core/lib/channel/client_channel.h"
@@ -49,7 +50,6 @@
 #include "src/core/lib/iomgr/tcp_client.h"
 #include "src/core/lib/surface/api_trace.h"
 #include "src/core/lib/surface/channel.h"
-#include "src/core/lib/transport/chttp2_transport.h"
 
 typedef struct {
   grpc_connector base;
diff --git a/src/core/ext/transport/chttp2/client/secure/README.md b/src/core/ext/transport/chttp2/client/secure/README.md
new file mode 100644
index 0000000000..405a86e5db
--- /dev/null
+++ b/src/core/ext/transport/chttp2/client/secure/README.md
@@ -0,0 +1 @@
+Plugin for creating secure channels using chttp2
diff --git a/src/core/lib/surface/secure_channel_create.c b/src/core/ext/transport/chttp2/client/secure/secure_channel_create.c
index dcb367023e..203475ba52 100644
--- a/src/core/lib/surface/secure_channel_create.c
+++ b/src/core/ext/transport/chttp2/client/secure/secure_channel_create.c
@@ -40,6 +40,7 @@
 #include <grpc/support/slice.h>
 #include <grpc/support/slice_buffer.h>
 
+#include "src/core/ext/transport/chttp2/transport/chttp2_transport.h"
 #include "src/core/lib/channel/channel_args.h"
 #include "src/core/lib/channel/client_channel.h"
 #include "src/core/lib/client_config/resolver_registry.h"
@@ -49,7 +50,6 @@
 #include "src/core/lib/security/security_context.h"
 #include "src/core/lib/surface/api_trace.h"
 #include "src/core/lib/surface/channel.h"
-#include "src/core/lib/transport/chttp2_transport.h"
 #include "src/core/lib/tsi/transport_security_interface.h"
 
 typedef struct {
@@ -267,7 +267,7 @@ grpc_channel *grpc_secure_channel_create(grpc_channel_credentials *creds,
     gpr_log(GPR_ERROR, "Cannot set security context in channel args.");
     grpc_exec_ctx_finish(&exec_ctx);
     return grpc_lame_client_channel_create(
-        target, GRPC_STATUS_INVALID_ARGUMENT,
+        target, GRPC_STATUS_INTERNAL,
         "Security connector exists in channel args.");
   }
 
@@ -276,8 +276,7 @@ grpc_channel *grpc_secure_channel_create(grpc_channel_credentials *creds,
       GRPC_SECURITY_OK) {
     grpc_exec_ctx_finish(&exec_ctx);
     return grpc_lame_client_channel_create(
-        target, GRPC_STATUS_INVALID_ARGUMENT,
-        "Failed to create security connector.");
+        target, GRPC_STATUS_INTERNAL, "Failed to create security connector.");
   }
 
   connector_arg = grpc_security_connector_to_arg(&security_connector->base);
diff --git a/src/core/ext/transport/chttp2/server/insecure/README.md b/src/core/ext/transport/chttp2/server/insecure/README.md
new file mode 100644
index 0000000000..fc0bc14ed7
--- /dev/null
+++ b/src/core/ext/transport/chttp2/server/insecure/README.md
@@ -0,0 +1 @@
+Plugin for creating insecure servers using chttp2
diff --git a/src/core/lib/surface/server_chttp2.c b/src/core/ext/transport/chttp2/server/insecure/server_chttp2.c
index f0c2ee5153..c1ccfbf639 100644
--- a/src/core/lib/surface/server_chttp2.c
+++ b/src/core/ext/transport/chttp2/server/insecure/server_chttp2.c
@@ -36,12 +36,12 @@
 #include <grpc/support/alloc.h>
 #include <grpc/support/log.h>
 #include <grpc/support/useful.h>
+#include "src/core/ext/transport/chttp2/transport/chttp2_transport.h"
 #include "src/core/lib/channel/http_server_filter.h"
 #include "src/core/lib/iomgr/resolve_address.h"
 #include "src/core/lib/iomgr/tcp_server.h"
 #include "src/core/lib/surface/api_trace.h"
 #include "src/core/lib/surface/server.h"
-#include "src/core/lib/transport/chttp2_transport.h"
 
 static void setup_transport(grpc_exec_ctx *exec_ctx, void *server,
                             grpc_transport *transport) {
diff --git a/src/core/ext/transport/chttp2/server/secure/README.md b/src/core/ext/transport/chttp2/server/secure/README.md
new file mode 100644
index 0000000000..6bda696a9a
--- /dev/null
+++ b/src/core/ext/transport/chttp2/server/secure/README.md
@@ -0,0 +1 @@
+Plugin for creating secure servers using chttp2
diff --git a/src/core/lib/security/server_secure_chttp2.c b/src/core/ext/transport/chttp2/server/secure/server_secure_chttp2.c
index 7c9dd221ed..80834f4e88 100644
--- a/src/core/lib/security/server_secure_chttp2.c
+++ b/src/core/ext/transport/chttp2/server/secure/server_secure_chttp2.c
@@ -39,6 +39,7 @@
 #include <grpc/support/log.h>
 #include <grpc/support/sync.h>
 #include <grpc/support/useful.h>
+#include "src/core/ext/transport/chttp2/transport/chttp2_transport.h"
 #include "src/core/lib/channel/channel_args.h"
 #include "src/core/lib/channel/http_server_filter.h"
 #include "src/core/lib/iomgr/endpoint.h"
@@ -50,7 +51,6 @@
 #include "src/core/lib/security/security_context.h"
 #include "src/core/lib/surface/api_trace.h"
 #include "src/core/lib/surface/server.h"
-#include "src/core/lib/transport/chttp2_transport.h"
 
 typedef struct grpc_server_secure_state {
   grpc_server *server;
diff --git a/src/core/ext/transport/chttp2/transport/README.md b/src/core/ext/transport/chttp2/transport/README.md
new file mode 100644
index 0000000000..4684e58759
--- /dev/null
+++ b/src/core/ext/transport/chttp2/transport/README.md
@@ -0,0 +1,4 @@
+chttp2 transport plugin - implements grpc over http2
+
+Used by chttp2/{client,server}/{insecure,secure} plugins to implement most of
+their functionality
diff --git a/src/core/lib/transport/chttp2/alpn.c b/src/core/ext/transport/chttp2/transport/alpn.c
index befe319180..c901905d02 100644
--- a/src/core/lib/transport/chttp2/alpn.c
+++ b/src/core/ext/transport/chttp2/transport/alpn.c
@@ -31,7 +31,7 @@
  *
  */
 
-#include "src/core/lib/transport/chttp2/alpn.h"
+#include "src/core/ext/transport/chttp2/transport/alpn.h"
 #include <grpc/support/log.h>
 #include <grpc/support/useful.h>
 
diff --git a/src/core/lib/transport/chttp2/alpn.h b/src/core/ext/transport/chttp2/transport/alpn.h
index a9184e63a4..94843a1456 100644
--- a/src/core/lib/transport/chttp2/alpn.h
+++ b/src/core/ext/transport/chttp2/transport/alpn.h
@@ -31,8 +31,8 @@
  *
  */
 
-#ifndef GRPC_CORE_LIB_TRANSPORT_CHTTP2_ALPN_H
-#define GRPC_CORE_LIB_TRANSPORT_CHTTP2_ALPN_H
+#ifndef GRPC_CORE_EXT_TRANSPORT_CHTTP2_TRANSPORT_ALPN_H
+#define GRPC_CORE_EXT_TRANSPORT_CHTTP2_TRANSPORT_ALPN_H
 
 #include <string.h>
 
@@ -46,4 +46,4 @@ size_t grpc_chttp2_num_alpn_versions(void);
  * grpc_chttp2_num_alpn_versions()) */
 const char *grpc_chttp2_get_alpn_version_index(size_t i);
 
-#endif /* GRPC_CORE_LIB_TRANSPORT_CHTTP2_ALPN_H */
+#endif /* GRPC_CORE_EXT_TRANSPORT_CHTTP2_TRANSPORT_ALPN_H */
diff --git a/src/core/lib/transport/chttp2/bin_encoder.c b/src/core/ext/transport/chttp2/transport/bin_encoder.c
index 79d0aa3d6f..d39f99c271 100644
--- a/src/core/lib/transport/chttp2/bin_encoder.c
+++ b/src/core/ext/transport/chttp2/transport/bin_encoder.c
@@ -31,12 +31,12 @@
  *
  */
 
-#include "src/core/lib/transport/chttp2/bin_encoder.h"
+#include "src/core/ext/transport/chttp2/transport/bin_encoder.h"
 
 #include <string.h>
 
 #include <grpc/support/log.h>
-#include "src/core/lib/transport/chttp2/huffsyms.h"
+#include "src/core/ext/transport/chttp2/transport/huffsyms.h"
 
 static const char alphabet[] =
     "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
diff --git a/src/core/lib/transport/chttp2/bin_encoder.h b/src/core/ext/transport/chttp2/transport/bin_encoder.h
index 1c5cd1e1c6..39dae973c9 100644
--- a/src/core/lib/transport/chttp2/bin_encoder.h
+++ b/src/core/ext/transport/chttp2/transport/bin_encoder.h
@@ -31,8 +31,8 @@
  *
  */
 
-#ifndef GRPC_CORE_LIB_TRANSPORT_CHTTP2_BIN_ENCODER_H
-#define GRPC_CORE_LIB_TRANSPORT_CHTTP2_BIN_ENCODER_H
+#ifndef GRPC_CORE_EXT_TRANSPORT_CHTTP2_TRANSPORT_BIN_ENCODER_H
+#define GRPC_CORE_EXT_TRANSPORT_CHTTP2_TRANSPORT_BIN_ENCODER_H
 
 #include <grpc/support/slice.h>
 
@@ -51,4 +51,4 @@ gpr_slice grpc_chttp2_huffman_compress(gpr_slice input);
    return y; */
 gpr_slice grpc_chttp2_base64_encode_and_huffman_compress(gpr_slice input);
 
-#endif /* GRPC_CORE_LIB_TRANSPORT_CHTTP2_BIN_ENCODER_H */
+#endif /* GRPC_CORE_EXT_TRANSPORT_CHTTP2_TRANSPORT_BIN_ENCODER_H */
diff --git a/src/core/lib/transport/chttp2_transport.c b/src/core/ext/transport/chttp2/transport/chttp2_transport.c
index 7fed3d8b47..0a307a73a6 100644
--- a/src/core/lib/transport/chttp2_transport.c
+++ b/src/core/ext/transport/chttp2/transport/chttp2_transport.c
@@ -31,7 +31,7 @@
  *
  */
 
-#include "src/core/lib/transport/chttp2_transport.h"
+#include "src/core/ext/transport/chttp2/transport/chttp2_transport.h"
 
 #include <math.h>
 #include <stdio.h>
@@ -43,12 +43,12 @@
 #include <grpc/support/string_util.h>
 #include <grpc/support/useful.h>
 
+#include "src/core/ext/transport/chttp2/transport/http2_errors.h"
+#include "src/core/ext/transport/chttp2/transport/internal.h"
+#include "src/core/ext/transport/chttp2/transport/status_conversion.h"
+#include "src/core/ext/transport/chttp2/transport/timeout_encoding.h"
 #include "src/core/lib/profiling/timers.h"
 #include "src/core/lib/support/string.h"
-#include "src/core/lib/transport/chttp2/http2_errors.h"
-#include "src/core/lib/transport/chttp2/internal.h"
-#include "src/core/lib/transport/chttp2/status_conversion.h"
-#include "src/core/lib/transport/chttp2/timeout_encoding.h"
 #include "src/core/lib/transport/static_metadata.h"
 #include "src/core/lib/transport/transport_impl.h"
 
diff --git a/src/core/lib/transport/chttp2_transport.h b/src/core/ext/transport/chttp2/transport/chttp2_transport.h
index 5008cab7f8..8ebf9fced6 100644
--- a/src/core/lib/transport/chttp2_transport.h
+++ b/src/core/ext/transport/chttp2/transport/chttp2_transport.h
@@ -31,8 +31,8 @@
  *
  */
 
-#ifndef GRPC_CORE_LIB_TRANSPORT_CHTTP2_TRANSPORT_H
-#define GRPC_CORE_LIB_TRANSPORT_CHTTP2_TRANSPORT_H
+#ifndef GRPC_CORE_EXT_TRANSPORT_CHTTP2_TRANSPORT_CHTTP2_TRANSPORT_H
+#define GRPC_CORE_EXT_TRANSPORT_CHTTP2_TRANSPORT_CHTTP2_TRANSPORT_H
 
 #include "src/core/lib/iomgr/endpoint.h"
 #include "src/core/lib/transport/transport.h"
@@ -48,4 +48,4 @@ void grpc_chttp2_transport_start_reading(grpc_exec_ctx *exec_ctx,
                                          grpc_transport *transport,
                                          gpr_slice *slices, size_t nslices);
 
-#endif /* GRPC_CORE_LIB_TRANSPORT_CHTTP2_TRANSPORT_H */
+#endif /* GRPC_CORE_EXT_TRANSPORT_CHTTP2_TRANSPORT_CHTTP2_TRANSPORT_H */
diff --git a/src/core/lib/transport/chttp2/frame.h b/src/core/ext/transport/chttp2/transport/frame.h
index 4674bc9703..e1311a1805 100644
--- a/src/core/lib/transport/chttp2/frame.h
+++ b/src/core/ext/transport/chttp2/transport/frame.h
@@ -31,8 +31,8 @@
  *
  */
 
-#ifndef GRPC_CORE_LIB_TRANSPORT_CHTTP2_FRAME_H
-#define GRPC_CORE_LIB_TRANSPORT_CHTTP2_FRAME_H
+#ifndef GRPC_CORE_EXT_TRANSPORT_CHTTP2_TRANSPORT_FRAME_H
+#define GRPC_CORE_EXT_TRANSPORT_CHTTP2_TRANSPORT_FRAME_H
 
 #include <grpc/support/port_platform.h>
 #include <grpc/support/slice.h>
@@ -66,4 +66,4 @@ typedef struct grpc_chttp2_transport_parsing grpc_chttp2_transport_parsing;
 #define GRPC_CHTTP2_DATA_FLAG_PADDED 8
 #define GRPC_CHTTP2_FLAG_HAS_PRIORITY 0x20
 
-#endif /* GRPC_CORE_LIB_TRANSPORT_CHTTP2_FRAME_H */
+#endif /* GRPC_CORE_EXT_TRANSPORT_CHTTP2_TRANSPORT_FRAME_H */
diff --git a/src/core/lib/transport/chttp2/frame_data.c b/src/core/ext/transport/chttp2/transport/frame_data.c
index cf25c3ccc1..cdd624647c 100644
--- a/src/core/lib/transport/chttp2/frame_data.c
+++ b/src/core/ext/transport/chttp2/transport/frame_data.c
@@ -31,15 +31,15 @@
  *
  */
 
-#include "src/core/lib/transport/chttp2/frame_data.h"
+#include "src/core/ext/transport/chttp2/transport/frame_data.h"
 
 #include <string.h>
 
 #include <grpc/support/alloc.h>
 #include <grpc/support/log.h>
 #include <grpc/support/useful.h>
+#include "src/core/ext/transport/chttp2/transport/internal.h"
 #include "src/core/lib/support/string.h"
-#include "src/core/lib/transport/chttp2/internal.h"
 #include "src/core/lib/transport/transport.h"
 
 grpc_chttp2_parse_error grpc_chttp2_data_parser_init(
diff --git a/src/core/lib/transport/chttp2/frame_data.h b/src/core/ext/transport/chttp2/transport/frame_data.h
index da404a42c6..f2762ed9de 100644
--- a/src/core/lib/transport/chttp2/frame_data.h
+++ b/src/core/ext/transport/chttp2/transport/frame_data.h
@@ -31,16 +31,16 @@
  *
  */
 
-#ifndef GRPC_CORE_LIB_TRANSPORT_CHTTP2_FRAME_DATA_H
-#define GRPC_CORE_LIB_TRANSPORT_CHTTP2_FRAME_DATA_H
+#ifndef GRPC_CORE_EXT_TRANSPORT_CHTTP2_TRANSPORT_FRAME_DATA_H
+#define GRPC_CORE_EXT_TRANSPORT_CHTTP2_TRANSPORT_FRAME_DATA_H
 
 /* Parser for GRPC streams embedded in DATA frames */
 
 #include <grpc/support/slice.h>
 #include <grpc/support/slice_buffer.h>
+#include "src/core/ext/transport/chttp2/transport/frame.h"
 #include "src/core/lib/iomgr/exec_ctx.h"
 #include "src/core/lib/transport/byte_stream.h"
-#include "src/core/lib/transport/chttp2/frame.h"
 
 typedef enum {
   GRPC_CHTTP2_DATA_FH_0,
@@ -98,4 +98,4 @@ void grpc_chttp2_encode_data(uint32_t id, gpr_slice_buffer *inbuf,
                              uint32_t write_bytes, int is_eof,
                              gpr_slice_buffer *outbuf);
 
-#endif /* GRPC_CORE_LIB_TRANSPORT_CHTTP2_FRAME_DATA_H */
+#endif /* GRPC_CORE_EXT_TRANSPORT_CHTTP2_TRANSPORT_FRAME_DATA_H */
diff --git a/src/core/lib/transport/chttp2/frame_goaway.c b/src/core/ext/transport/chttp2/transport/frame_goaway.c
index bb8c28df90..3697fdef41 100644
--- a/src/core/lib/transport/chttp2/frame_goaway.c
+++ b/src/core/ext/transport/chttp2/transport/frame_goaway.c
@@ -31,8 +31,8 @@
  *
  */
 
-#include "src/core/lib/transport/chttp2/frame_goaway.h"
-#include "src/core/lib/transport/chttp2/internal.h"
+#include "src/core/ext/transport/chttp2/transport/frame_goaway.h"
+#include "src/core/ext/transport/chttp2/transport/internal.h"
 
 #include <string.h>
 
diff --git a/src/core/lib/transport/chttp2/frame_goaway.h b/src/core/ext/transport/chttp2/transport/frame_goaway.h
index f64c44f3d9..e655134434 100644
--- a/src/core/lib/transport/chttp2/frame_goaway.h
+++ b/src/core/ext/transport/chttp2/transport/frame_goaway.h
@@ -31,14 +31,14 @@
  *
  */
 
-#ifndef GRPC_CORE_LIB_TRANSPORT_CHTTP2_FRAME_GOAWAY_H
-#define GRPC_CORE_LIB_TRANSPORT_CHTTP2_FRAME_GOAWAY_H
+#ifndef GRPC_CORE_EXT_TRANSPORT_CHTTP2_TRANSPORT_FRAME_GOAWAY_H
+#define GRPC_CORE_EXT_TRANSPORT_CHTTP2_TRANSPORT_FRAME_GOAWAY_H
 
 #include <grpc/support/port_platform.h>
 #include <grpc/support/slice.h>
 #include <grpc/support/slice_buffer.h>
+#include "src/core/ext/transport/chttp2/transport/frame.h"
 #include "src/core/lib/iomgr/exec_ctx.h"
-#include "src/core/lib/transport/chttp2/frame.h"
 
 typedef enum {
   GRPC_CHTTP2_GOAWAY_LSI0,
@@ -74,4 +74,4 @@ void grpc_chttp2_goaway_append(uint32_t last_stream_id, uint32_t error_code,
                                gpr_slice debug_data,
                                gpr_slice_buffer *slice_buffer);
 
-#endif /* GRPC_CORE_LIB_TRANSPORT_CHTTP2_FRAME_GOAWAY_H */
+#endif /* GRPC_CORE_EXT_TRANSPORT_CHTTP2_TRANSPORT_FRAME_GOAWAY_H */
diff --git a/src/core/lib/transport/chttp2/frame_ping.c b/src/core/ext/transport/chttp2/transport/frame_ping.c
index 14ca394264..c0192a734d 100644
--- a/src/core/lib/transport/chttp2/frame_ping.c
+++ b/src/core/ext/transport/chttp2/transport/frame_ping.c
@@ -31,8 +31,8 @@
  *
  */
 
-#include "src/core/lib/transport/chttp2/frame_ping.h"
-#include "src/core/lib/transport/chttp2/internal.h"
+#include "src/core/ext/transport/chttp2/transport/frame_ping.h"
+#include "src/core/ext/transport/chttp2/transport/internal.h"
 
 #include <string.h>
 
diff --git a/src/core/lib/transport/chttp2/frame_ping.h b/src/core/ext/transport/chttp2/transport/frame_ping.h
index 7640fc4773..1c1d513c99 100644
--- a/src/core/lib/transport/chttp2/frame_ping.h
+++ b/src/core/ext/transport/chttp2/transport/frame_ping.h
@@ -31,12 +31,12 @@
  *
  */
 
-#ifndef GRPC_CORE_LIB_TRANSPORT_CHTTP2_FRAME_PING_H
-#define GRPC_CORE_LIB_TRANSPORT_CHTTP2_FRAME_PING_H
+#ifndef GRPC_CORE_EXT_TRANSPORT_CHTTP2_TRANSPORT_FRAME_PING_H
+#define GRPC_CORE_EXT_TRANSPORT_CHTTP2_TRANSPORT_FRAME_PING_H
 
 #include <grpc/support/slice.h>
+#include "src/core/ext/transport/chttp2/transport/frame.h"
 #include "src/core/lib/iomgr/exec_ctx.h"
-#include "src/core/lib/transport/chttp2/frame.h"
 
 typedef struct {
   uint8_t byte;
@@ -53,4 +53,4 @@ grpc_chttp2_parse_error grpc_chttp2_ping_parser_parse(
     grpc_chttp2_transport_parsing *transport_parsing,
     grpc_chttp2_stream_parsing *stream_parsing, gpr_slice slice, int is_last);
 
-#endif /* GRPC_CORE_LIB_TRANSPORT_CHTTP2_FRAME_PING_H */
+#endif /* GRPC_CORE_EXT_TRANSPORT_CHTTP2_TRANSPORT_FRAME_PING_H */
diff --git a/src/core/lib/transport/chttp2/frame_rst_stream.c b/src/core/ext/transport/chttp2/transport/frame_rst_stream.c
index 060912afc4..acfc3627e8 100644
--- a/src/core/lib/transport/chttp2/frame_rst_stream.c
+++ b/src/core/ext/transport/chttp2/transport/frame_rst_stream.c
@@ -31,12 +31,12 @@
  *
  */
 
-#include "src/core/lib/transport/chttp2/frame_rst_stream.h"
-#include "src/core/lib/transport/chttp2/internal.h"
+#include "src/core/ext/transport/chttp2/transport/frame_rst_stream.h"
+#include "src/core/ext/transport/chttp2/transport/internal.h"
 
 #include <grpc/support/log.h>
 
-#include "src/core/lib/transport/chttp2/frame.h"
+#include "src/core/ext/transport/chttp2/transport/frame.h"
 
 gpr_slice grpc_chttp2_rst_stream_create(uint32_t id, uint32_t code) {
   gpr_slice slice = gpr_slice_malloc(13);
diff --git a/src/core/lib/transport/chttp2/frame_rst_stream.h b/src/core/ext/transport/chttp2/transport/frame_rst_stream.h
index 93155fde9d..134f1368a0 100644
--- a/src/core/lib/transport/chttp2/frame_rst_stream.h
+++ b/src/core/ext/transport/chttp2/transport/frame_rst_stream.h
@@ -31,12 +31,12 @@
  *
  */
 
-#ifndef GRPC_CORE_LIB_TRANSPORT_CHTTP2_FRAME_RST_STREAM_H
-#define GRPC_CORE_LIB_TRANSPORT_CHTTP2_FRAME_RST_STREAM_H
+#ifndef GRPC_CORE_EXT_TRANSPORT_CHTTP2_TRANSPORT_FRAME_RST_STREAM_H
+#define GRPC_CORE_EXT_TRANSPORT_CHTTP2_TRANSPORT_FRAME_RST_STREAM_H
 
 #include <grpc/support/slice.h>
+#include "src/core/ext/transport/chttp2/transport/frame.h"
 #include "src/core/lib/iomgr/exec_ctx.h"
-#include "src/core/lib/transport/chttp2/frame.h"
 
 typedef struct {
   uint8_t byte;
@@ -52,4 +52,4 @@ grpc_chttp2_parse_error grpc_chttp2_rst_stream_parser_parse(
     grpc_chttp2_transport_parsing *transport_parsing,
     grpc_chttp2_stream_parsing *stream_parsing, gpr_slice slice, int is_last);
 
-#endif /* GRPC_CORE_LIB_TRANSPORT_CHTTP2_FRAME_RST_STREAM_H */
+#endif /* GRPC_CORE_EXT_TRANSPORT_CHTTP2_TRANSPORT_FRAME_RST_STREAM_H */
diff --git a/src/core/lib/transport/chttp2/frame_settings.c b/src/core/ext/transport/chttp2/transport/frame_settings.c
index 48429c2a78..799d87b87d 100644
--- a/src/core/lib/transport/chttp2/frame_settings.c
+++ b/src/core/ext/transport/chttp2/transport/frame_settings.c
@@ -31,18 +31,18 @@
  *
  */
 
-#include "src/core/lib/transport/chttp2/frame_settings.h"
-#include "src/core/lib/transport/chttp2/internal.h"
+#include "src/core/ext/transport/chttp2/transport/frame_settings.h"
+#include "src/core/ext/transport/chttp2/transport/internal.h"
 
 #include <string.h>
 
 #include <grpc/support/log.h>
 #include <grpc/support/useful.h>
 
+#include "src/core/ext/transport/chttp2/transport/chttp2_transport.h"
+#include "src/core/ext/transport/chttp2/transport/frame.h"
+#include "src/core/ext/transport/chttp2/transport/http2_errors.h"
 #include "src/core/lib/debug/trace.h"
-#include "src/core/lib/transport/chttp2/frame.h"
-#include "src/core/lib/transport/chttp2/http2_errors.h"
-#include "src/core/lib/transport/chttp2_transport.h"
 
 #define MAX_MAX_HEADER_LIST_SIZE (1024 * 1024 * 1024)
 
diff --git a/src/core/lib/transport/chttp2/frame_settings.h b/src/core/ext/transport/chttp2/transport/frame_settings.h
index 8b294de021..73524addf0 100644
--- a/src/core/lib/transport/chttp2/frame_settings.h
+++ b/src/core/ext/transport/chttp2/transport/frame_settings.h
@@ -31,13 +31,13 @@
  *
  */
 
-#ifndef GRPC_CORE_LIB_TRANSPORT_CHTTP2_FRAME_SETTINGS_H
-#define GRPC_CORE_LIB_TRANSPORT_CHTTP2_FRAME_SETTINGS_H
+#ifndef GRPC_CORE_EXT_TRANSPORT_CHTTP2_TRANSPORT_FRAME_SETTINGS_H
+#define GRPC_CORE_EXT_TRANSPORT_CHTTP2_TRANSPORT_FRAME_SETTINGS_H
 
 #include <grpc/support/port_platform.h>
 #include <grpc/support/slice.h>
+#include "src/core/ext/transport/chttp2/transport/frame.h"
 #include "src/core/lib/iomgr/exec_ctx.h"
-#include "src/core/lib/transport/chttp2/frame.h"
 
 typedef enum {
   GRPC_CHTTP2_SPS_ID0,
@@ -100,4 +100,4 @@ grpc_chttp2_parse_error grpc_chttp2_settings_parser_parse(
     grpc_chttp2_transport_parsing *transport_parsing,
     grpc_chttp2_stream_parsing *stream_parsing, gpr_slice slice, int is_last);
 
-#endif /* GRPC_CORE_LIB_TRANSPORT_CHTTP2_FRAME_SETTINGS_H */
+#endif /* GRPC_CORE_EXT_TRANSPORT_CHTTP2_TRANSPORT_FRAME_SETTINGS_H */
diff --git a/src/core/lib/transport/chttp2/frame_window_update.c b/src/core/ext/transport/chttp2/transport/frame_window_update.c
index 2ab5003316..1a561cebaf 100644
--- a/src/core/lib/transport/chttp2/frame_window_update.c
+++ b/src/core/ext/transport/chttp2/transport/frame_window_update.c
@@ -31,8 +31,8 @@
  *
  */
 
-#include "src/core/lib/transport/chttp2/frame_window_update.h"
-#include "src/core/lib/transport/chttp2/internal.h"
+#include "src/core/ext/transport/chttp2/transport/frame_window_update.h"
+#include "src/core/ext/transport/chttp2/transport/internal.h"
 
 #include <grpc/support/log.h>
 
diff --git a/src/core/lib/transport/chttp2/frame_window_update.h b/src/core/ext/transport/chttp2/transport/frame_window_update.h
index 4b1aea294d..f9f670b6f1 100644
--- a/src/core/lib/transport/chttp2/frame_window_update.h
+++ b/src/core/ext/transport/chttp2/transport/frame_window_update.h
@@ -31,12 +31,12 @@
  *
  */
 
-#ifndef GRPC_CORE_LIB_TRANSPORT_CHTTP2_FRAME_WINDOW_UPDATE_H
-#define GRPC_CORE_LIB_TRANSPORT_CHTTP2_FRAME_WINDOW_UPDATE_H
+#ifndef GRPC_CORE_EXT_TRANSPORT_CHTTP2_TRANSPORT_FRAME_WINDOW_UPDATE_H
+#define GRPC_CORE_EXT_TRANSPORT_CHTTP2_TRANSPORT_FRAME_WINDOW_UPDATE_H
 
 #include <grpc/support/slice.h>
+#include "src/core/ext/transport/chttp2/transport/frame.h"
 #include "src/core/lib/iomgr/exec_ctx.h"
-#include "src/core/lib/transport/chttp2/frame.h"
 
 typedef struct {
   uint8_t byte;
@@ -53,4 +53,4 @@ grpc_chttp2_parse_error grpc_chttp2_window_update_parser_parse(
     grpc_chttp2_transport_parsing *transport_parsing,
     grpc_chttp2_stream_parsing *stream_parsing, gpr_slice slice, int is_last);
 
-#endif /* GRPC_CORE_LIB_TRANSPORT_CHTTP2_FRAME_WINDOW_UPDATE_H */
+#endif /* GRPC_CORE_EXT_TRANSPORT_CHTTP2_TRANSPORT_FRAME_WINDOW_UPDATE_H */
diff --git a/src/core/lib/transport/chttp2/hpack_encoder.c b/src/core/ext/transport/chttp2/transport/hpack_encoder.c
index 6b45929b04..819addd9e3 100644
--- a/src/core/lib/transport/chttp2/hpack_encoder.c
+++ b/src/core/ext/transport/chttp2/transport/hpack_encoder.c
@@ -31,7 +31,7 @@
  *
  */
 
-#include "src/core/lib/transport/chttp2/hpack_encoder.h"
+#include "src/core/ext/transport/chttp2/transport/hpack_encoder.h"
 
 #include <assert.h>
 #include <string.h>
@@ -45,10 +45,10 @@
 #include <grpc/support/log.h>
 #include <grpc/support/useful.h>
 
-#include "src/core/lib/transport/chttp2/bin_encoder.h"
-#include "src/core/lib/transport/chttp2/hpack_table.h"
-#include "src/core/lib/transport/chttp2/timeout_encoding.h"
-#include "src/core/lib/transport/chttp2/varint.h"
+#include "src/core/ext/transport/chttp2/transport/bin_encoder.h"
+#include "src/core/ext/transport/chttp2/transport/hpack_table.h"
+#include "src/core/ext/transport/chttp2/transport/timeout_encoding.h"
+#include "src/core/ext/transport/chttp2/transport/varint.h"
 #include "src/core/lib/transport/static_metadata.h"
 
 #define HASH_FRAGMENT_1(x) ((x)&255)
diff --git a/src/core/lib/transport/chttp2/hpack_encoder.h b/src/core/ext/transport/chttp2/transport/hpack_encoder.h
index de46a8f146..d79de35979 100644
--- a/src/core/lib/transport/chttp2/hpack_encoder.h
+++ b/src/core/ext/transport/chttp2/transport/hpack_encoder.h
@@ -31,13 +31,13 @@
  *
  */
 
-#ifndef GRPC_CORE_LIB_TRANSPORT_CHTTP2_HPACK_ENCODER_H
-#define GRPC_CORE_LIB_TRANSPORT_CHTTP2_HPACK_ENCODER_H
+#ifndef GRPC_CORE_EXT_TRANSPORT_CHTTP2_TRANSPORT_HPACK_ENCODER_H
+#define GRPC_CORE_EXT_TRANSPORT_CHTTP2_TRANSPORT_HPACK_ENCODER_H
 
 #include <grpc/support/port_platform.h>
 #include <grpc/support/slice.h>
 #include <grpc/support/slice_buffer.h>
-#include "src/core/lib/transport/chttp2/frame.h"
+#include "src/core/ext/transport/chttp2/transport/frame.h"
 #include "src/core/lib/transport/metadata.h"
 #include "src/core/lib/transport/metadata_batch.h"
 
@@ -92,4 +92,4 @@ void grpc_chttp2_encode_header(grpc_chttp2_hpack_compressor *c, uint32_t id,
                                grpc_metadata_batch *metadata, int is_eof,
                                gpr_slice_buffer *outbuf);
 
-#endif /* GRPC_CORE_LIB_TRANSPORT_CHTTP2_HPACK_ENCODER_H */
+#endif /* GRPC_CORE_EXT_TRANSPORT_CHTTP2_TRANSPORT_HPACK_ENCODER_H */
diff --git a/src/core/lib/transport/chttp2/hpack_parser.c b/src/core/ext/transport/chttp2/transport/hpack_parser.c
index d41ebab147..58e90f98f2 100644
--- a/src/core/lib/transport/chttp2/hpack_parser.c
+++ b/src/core/ext/transport/chttp2/transport/hpack_parser.c
@@ -31,8 +31,8 @@
  *
  */
 
-#include "src/core/lib/transport/chttp2/hpack_parser.h"
-#include "src/core/lib/transport/chttp2/internal.h"
+#include "src/core/ext/transport/chttp2/transport/hpack_parser.h"
+#include "src/core/ext/transport/chttp2/transport/internal.h"
 
 #include <assert.h>
 #include <stddef.h>
@@ -48,9 +48,9 @@
 #include <grpc/support/port_platform.h>
 #include <grpc/support/useful.h>
 
+#include "src/core/ext/transport/chttp2/transport/bin_encoder.h"
 #include "src/core/lib/profiling/timers.h"
 #include "src/core/lib/support/string.h"
-#include "src/core/lib/transport/chttp2/bin_encoder.h"
 
 typedef enum {
   NOT_BINARY,
diff --git a/src/core/lib/transport/chttp2/hpack_parser.h b/src/core/ext/transport/chttp2/transport/hpack_parser.h
index a534fd5cf4..0aaddc8b9c 100644
--- a/src/core/lib/transport/chttp2/hpack_parser.h
+++ b/src/core/ext/transport/chttp2/transport/hpack_parser.h
@@ -31,15 +31,15 @@
  *
  */
 
-#ifndef GRPC_CORE_LIB_TRANSPORT_CHTTP2_HPACK_PARSER_H
-#define GRPC_CORE_LIB_TRANSPORT_CHTTP2_HPACK_PARSER_H
+#ifndef GRPC_CORE_EXT_TRANSPORT_CHTTP2_TRANSPORT_HPACK_PARSER_H
+#define GRPC_CORE_EXT_TRANSPORT_CHTTP2_TRANSPORT_HPACK_PARSER_H
 
 #include <stddef.h>
 
 #include <grpc/support/port_platform.h>
+#include "src/core/ext/transport/chttp2/transport/frame.h"
+#include "src/core/ext/transport/chttp2/transport/hpack_table.h"
 #include "src/core/lib/iomgr/exec_ctx.h"
-#include "src/core/lib/transport/chttp2/frame.h"
-#include "src/core/lib/transport/chttp2/hpack_table.h"
 #include "src/core/lib/transport/metadata.h"
 
 typedef struct grpc_chttp2_hpack_parser grpc_chttp2_hpack_parser;
@@ -113,4 +113,4 @@ grpc_chttp2_parse_error grpc_chttp2_header_parser_parse(
     grpc_chttp2_transport_parsing *transport_parsing,
     grpc_chttp2_stream_parsing *stream_parsing, gpr_slice slice, int is_last);
 
-#endif /* GRPC_CORE_LIB_TRANSPORT_CHTTP2_HPACK_PARSER_H */
+#endif /* GRPC_CORE_EXT_TRANSPORT_CHTTP2_TRANSPORT_HPACK_PARSER_H */
diff --git a/src/core/lib/transport/chttp2/hpack_table.c b/src/core/ext/transport/chttp2/transport/hpack_table.c
index f92bc26585..d02f4ddc61 100644
--- a/src/core/lib/transport/chttp2/hpack_table.c
+++ b/src/core/ext/transport/chttp2/transport/hpack_table.c
@@ -31,7 +31,7 @@
  *
  */
 
-#include "src/core/lib/transport/chttp2/hpack_table.h"
+#include "src/core/ext/transport/chttp2/transport/hpack_table.h"
 
 #include <assert.h>
 #include <string.h>
diff --git a/src/core/lib/transport/chttp2/hpack_table.h b/src/core/ext/transport/chttp2/transport/hpack_table.h
index 2cbc02dd9c..b3475c8f5c 100644
--- a/src/core/lib/transport/chttp2/hpack_table.h
+++ b/src/core/ext/transport/chttp2/transport/hpack_table.h
@@ -31,8 +31,8 @@
  *
  */
 
-#ifndef GRPC_CORE_LIB_TRANSPORT_CHTTP2_HPACK_TABLE_H
-#define GRPC_CORE_LIB_TRANSPORT_CHTTP2_HPACK_TABLE_H
+#ifndef GRPC_CORE_EXT_TRANSPORT_CHTTP2_TRANSPORT_HPACK_TABLE_H
+#define GRPC_CORE_EXT_TRANSPORT_CHTTP2_TRANSPORT_HPACK_TABLE_H
 
 #include <grpc/support/port_platform.h>
 #include <grpc/support/slice.h>
@@ -105,4 +105,4 @@ typedef struct {
 grpc_chttp2_hptbl_find_result grpc_chttp2_hptbl_find(
     const grpc_chttp2_hptbl *tbl, grpc_mdelem *md);
 
-#endif /* GRPC_CORE_LIB_TRANSPORT_CHTTP2_HPACK_TABLE_H */
+#endif /* GRPC_CORE_EXT_TRANSPORT_CHTTP2_TRANSPORT_HPACK_TABLE_H */
diff --git a/src/core/lib/transport/chttp2/hpack_tables.txt b/src/core/ext/transport/chttp2/transport/hpack_tables.txt
index 08842a0267..08842a0267 100644
--- a/src/core/lib/transport/chttp2/hpack_tables.txt
+++ b/src/core/ext/transport/chttp2/transport/hpack_tables.txt
diff --git a/src/core/lib/transport/chttp2/http2_errors.h b/src/core/ext/transport/chttp2/transport/http2_errors.h
index 0238f9d80b..85542e2337 100644
--- a/src/core/lib/transport/chttp2/http2_errors.h
+++ b/src/core/ext/transport/chttp2/transport/http2_errors.h
@@ -31,8 +31,8 @@
  *
  */
 
-#ifndef GRPC_CORE_LIB_TRANSPORT_CHTTP2_HTTP2_ERRORS_H
-#define GRPC_CORE_LIB_TRANSPORT_CHTTP2_HTTP2_ERRORS_H
+#ifndef GRPC_CORE_EXT_TRANSPORT_CHTTP2_TRANSPORT_HTTP2_ERRORS_H
+#define GRPC_CORE_EXT_TRANSPORT_CHTTP2_TRANSPORT_HTTP2_ERRORS_H
 
 /* error codes for RST_STREAM from http2 draft 14 section 7 */
 typedef enum {
@@ -53,4 +53,4 @@ typedef enum {
   GRPC_CHTTP2__ERROR_DO_NOT_USE = -1
 } grpc_chttp2_error_code;
 
-#endif /* GRPC_CORE_LIB_TRANSPORT_CHTTP2_HTTP2_ERRORS_H */
+#endif /* GRPC_CORE_EXT_TRANSPORT_CHTTP2_TRANSPORT_HTTP2_ERRORS_H */
diff --git a/src/core/lib/transport/chttp2/huffsyms.c b/src/core/ext/transport/chttp2/transport/huffsyms.c
index 27497e6ae0..91f62bf34b 100644
--- a/src/core/lib/transport/chttp2/huffsyms.c
+++ b/src/core/ext/transport/chttp2/transport/huffsyms.c
@@ -31,7 +31,7 @@
  *
  */
 
-#include "src/core/lib/transport/chttp2/huffsyms.h"
+#include "src/core/ext/transport/chttp2/transport/huffsyms.h"
 
 /* Constants pulled from the HPACK spec, and converted to C using the vim
    command:
diff --git a/src/core/lib/transport/chttp2/huffsyms.h b/src/core/ext/transport/chttp2/transport/huffsyms.h
index 1ca77b9207..780baeaf55 100644
--- a/src/core/lib/transport/chttp2/huffsyms.h
+++ b/src/core/ext/transport/chttp2/transport/huffsyms.h
@@ -31,8 +31,8 @@
  *
  */
 
-#ifndef GRPC_CORE_LIB_TRANSPORT_CHTTP2_HUFFSYMS_H
-#define GRPC_CORE_LIB_TRANSPORT_CHTTP2_HUFFSYMS_H
+#ifndef GRPC_CORE_EXT_TRANSPORT_CHTTP2_TRANSPORT_HUFFSYMS_H
+#define GRPC_CORE_EXT_TRANSPORT_CHTTP2_TRANSPORT_HUFFSYMS_H
 
 /* HPACK static huffman table */
 
@@ -45,4 +45,4 @@ typedef struct {
 
 extern const grpc_chttp2_huffsym grpc_chttp2_huffsyms[GRPC_CHTTP2_NUM_HUFFSYMS];
 
-#endif /* GRPC_CORE_LIB_TRANSPORT_CHTTP2_HUFFSYMS_H */
+#endif /* GRPC_CORE_EXT_TRANSPORT_CHTTP2_TRANSPORT_HUFFSYMS_H */
diff --git a/src/core/lib/transport/chttp2/incoming_metadata.c b/src/core/ext/transport/chttp2/transport/incoming_metadata.c
index a1a8d37562..ef5fd4fe03 100644
--- a/src/core/lib/transport/chttp2/incoming_metadata.c
+++ b/src/core/ext/transport/chttp2/transport/incoming_metadata.c
@@ -31,11 +31,11 @@
  *
  */
 
-#include "src/core/lib/transport/chttp2/incoming_metadata.h"
+#include "src/core/ext/transport/chttp2/transport/incoming_metadata.h"
 
 #include <string.h>
 
-#include "src/core/lib/transport/chttp2/internal.h"
+#include "src/core/ext/transport/chttp2/transport/internal.h"
 
 #include <grpc/support/alloc.h>
 #include <grpc/support/log.h>
diff --git a/src/core/lib/transport/chttp2/incoming_metadata.h b/src/core/ext/transport/chttp2/transport/incoming_metadata.h
index edfa0adf9d..5e1dc72389 100644
--- a/src/core/lib/transport/chttp2/incoming_metadata.h
+++ b/src/core/ext/transport/chttp2/transport/incoming_metadata.h
@@ -31,8 +31,8 @@
  *
  */
 
-#ifndef GRPC_CORE_LIB_TRANSPORT_CHTTP2_INCOMING_METADATA_H
-#define GRPC_CORE_LIB_TRANSPORT_CHTTP2_INCOMING_METADATA_H
+#ifndef GRPC_CORE_EXT_TRANSPORT_CHTTP2_TRANSPORT_INCOMING_METADATA_H
+#define GRPC_CORE_EXT_TRANSPORT_CHTTP2_TRANSPORT_INCOMING_METADATA_H
 
 #include "src/core/lib/transport/transport.h"
 
@@ -57,4 +57,4 @@ void grpc_chttp2_incoming_metadata_buffer_add(
 void grpc_chttp2_incoming_metadata_buffer_set_deadline(
     grpc_chttp2_incoming_metadata_buffer *buffer, gpr_timespec deadline);
 
-#endif /* GRPC_CORE_LIB_TRANSPORT_CHTTP2_INCOMING_METADATA_H */
+#endif /* GRPC_CORE_EXT_TRANSPORT_CHTTP2_TRANSPORT_INCOMING_METADATA_H */
diff --git a/src/core/lib/transport/chttp2/internal.h b/src/core/ext/transport/chttp2/transport/internal.h
index 346e404204..2fae653623 100644
--- a/src/core/lib/transport/chttp2/internal.h
+++ b/src/core/ext/transport/chttp2/transport/internal.h
@@ -31,24 +31,24 @@
  *
  */
 
-#ifndef GRPC_CORE_LIB_TRANSPORT_CHTTP2_INTERNAL_H
-#define GRPC_CORE_LIB_TRANSPORT_CHTTP2_INTERNAL_H
+#ifndef GRPC_CORE_EXT_TRANSPORT_CHTTP2_TRANSPORT_INTERNAL_H
+#define GRPC_CORE_EXT_TRANSPORT_CHTTP2_TRANSPORT_INTERNAL_H
 
 #include <assert.h>
 #include <stdbool.h>
 
+#include "src/core/ext/transport/chttp2/transport/frame.h"
+#include "src/core/ext/transport/chttp2/transport/frame_data.h"
+#include "src/core/ext/transport/chttp2/transport/frame_goaway.h"
+#include "src/core/ext/transport/chttp2/transport/frame_ping.h"
+#include "src/core/ext/transport/chttp2/transport/frame_rst_stream.h"
+#include "src/core/ext/transport/chttp2/transport/frame_settings.h"
+#include "src/core/ext/transport/chttp2/transport/frame_window_update.h"
+#include "src/core/ext/transport/chttp2/transport/hpack_encoder.h"
+#include "src/core/ext/transport/chttp2/transport/hpack_parser.h"
+#include "src/core/ext/transport/chttp2/transport/incoming_metadata.h"
+#include "src/core/ext/transport/chttp2/transport/stream_map.h"
 #include "src/core/lib/iomgr/endpoint.h"
-#include "src/core/lib/transport/chttp2/frame.h"
-#include "src/core/lib/transport/chttp2/frame_data.h"
-#include "src/core/lib/transport/chttp2/frame_goaway.h"
-#include "src/core/lib/transport/chttp2/frame_ping.h"
-#include "src/core/lib/transport/chttp2/frame_rst_stream.h"
-#include "src/core/lib/transport/chttp2/frame_settings.h"
-#include "src/core/lib/transport/chttp2/frame_window_update.h"
-#include "src/core/lib/transport/chttp2/hpack_encoder.h"
-#include "src/core/lib/transport/chttp2/hpack_parser.h"
-#include "src/core/lib/transport/chttp2/incoming_metadata.h"
-#include "src/core/lib/transport/chttp2/stream_map.h"
 #include "src/core/lib/transport/connectivity_state.h"
 #include "src/core/lib/transport/transport_impl.h"
 
@@ -777,4 +777,4 @@ void grpc_chttp2_ack_ping(grpc_exec_ctx *exec_ctx,
 void grpc_chttp2_become_writable(grpc_chttp2_transport_global *transport_global,
                                  grpc_chttp2_stream_global *stream_global);
 
-#endif /* GRPC_CORE_LIB_TRANSPORT_CHTTP2_INTERNAL_H */
+#endif /* GRPC_CORE_EXT_TRANSPORT_CHTTP2_TRANSPORT_INTERNAL_H */
diff --git a/src/core/lib/transport/chttp2/parsing.c b/src/core/ext/transport/chttp2/transport/parsing.c
index 9ee52f63f2..a9f043cee3 100644
--- a/src/core/lib/transport/chttp2/parsing.c
+++ b/src/core/ext/transport/chttp2/transport/parsing.c
@@ -31,7 +31,7 @@
  *
  */
 
-#include "src/core/lib/transport/chttp2/internal.h"
+#include "src/core/ext/transport/chttp2/transport/internal.h"
 
 #include <string.h>
 
@@ -39,10 +39,10 @@
 #include <grpc/support/log.h>
 #include <grpc/support/string_util.h>
 
+#include "src/core/ext/transport/chttp2/transport/http2_errors.h"
+#include "src/core/ext/transport/chttp2/transport/status_conversion.h"
+#include "src/core/ext/transport/chttp2/transport/timeout_encoding.h"
 #include "src/core/lib/profiling/timers.h"
-#include "src/core/lib/transport/chttp2/http2_errors.h"
-#include "src/core/lib/transport/chttp2/status_conversion.h"
-#include "src/core/lib/transport/chttp2/timeout_encoding.h"
 #include "src/core/lib/transport/static_metadata.h"
 
 static int init_frame_parser(grpc_exec_ctx *exec_ctx,
diff --git a/src/core/lib/transport/chttp2/status_conversion.c b/src/core/ext/transport/chttp2/transport/status_conversion.c
index 73dd63e720..5a79579989 100644
--- a/src/core/lib/transport/chttp2/status_conversion.c
+++ b/src/core/ext/transport/chttp2/transport/status_conversion.c
@@ -31,7 +31,7 @@
  *
  */
 
-#include "src/core/lib/transport/chttp2/status_conversion.h"
+#include "src/core/ext/transport/chttp2/transport/status_conversion.h"
 
 int grpc_chttp2_grpc_status_to_http2_error(grpc_status_code status) {
   switch (status) {
diff --git a/src/core/lib/transport/chttp2/status_conversion.h b/src/core/ext/transport/chttp2/transport/status_conversion.h
index 241417d32e..e92a5f6702 100644
--- a/src/core/lib/transport/chttp2/status_conversion.h
+++ b/src/core/ext/transport/chttp2/transport/status_conversion.h
@@ -31,11 +31,11 @@
  *
  */
 
-#ifndef GRPC_CORE_LIB_TRANSPORT_CHTTP2_STATUS_CONVERSION_H
-#define GRPC_CORE_LIB_TRANSPORT_CHTTP2_STATUS_CONVERSION_H
+#ifndef GRPC_CORE_EXT_TRANSPORT_CHTTP2_TRANSPORT_STATUS_CONVERSION_H
+#define GRPC_CORE_EXT_TRANSPORT_CHTTP2_TRANSPORT_STATUS_CONVERSION_H
 
 #include <grpc/grpc.h>
-#include "src/core/lib/transport/chttp2/http2_errors.h"
+#include "src/core/ext/transport/chttp2/transport/http2_errors.h"
 
 /* Conversion of grpc status codes to http2 error codes (for RST_STREAM) */
 grpc_chttp2_error_code grpc_chttp2_grpc_status_to_http2_error(
@@ -47,4 +47,4 @@ grpc_status_code grpc_chttp2_http2_error_to_grpc_status(
 grpc_status_code grpc_chttp2_http2_status_to_grpc_status(int status);
 int grpc_chttp2_grpc_status_to_http2_status(grpc_status_code status);
 
-#endif /* GRPC_CORE_LIB_TRANSPORT_CHTTP2_STATUS_CONVERSION_H */
+#endif /* GRPC_CORE_EXT_TRANSPORT_CHTTP2_TRANSPORT_STATUS_CONVERSION_H */
diff --git a/src/core/lib/transport/chttp2/stream_lists.c b/src/core/ext/transport/chttp2/transport/stream_lists.c
index b51a041dc7..01ed49b1ec 100644
--- a/src/core/lib/transport/chttp2/stream_lists.c
+++ b/src/core/ext/transport/chttp2/transport/stream_lists.c
@@ -31,7 +31,7 @@
  *
  */
 
-#include "src/core/lib/transport/chttp2/internal.h"
+#include "src/core/ext/transport/chttp2/transport/internal.h"
 
 #include <grpc/support/log.h>
 
diff --git a/src/core/lib/transport/chttp2/stream_map.c b/src/core/ext/transport/chttp2/transport/stream_map.c
index dbbbe783bf..3fb1389650 100644
--- a/src/core/lib/transport/chttp2/stream_map.c
+++ b/src/core/ext/transport/chttp2/transport/stream_map.c
@@ -31,7 +31,7 @@
  *
  */
 
-#include "src/core/lib/transport/chttp2/stream_map.h"
+#include "src/core/ext/transport/chttp2/transport/stream_map.h"
 
 #include <string.h>
 
diff --git a/src/core/lib/transport/chttp2/stream_map.h b/src/core/ext/transport/chttp2/transport/stream_map.h
index 1c56b18e54..4e8586fe46 100644
--- a/src/core/lib/transport/chttp2/stream_map.h
+++ b/src/core/ext/transport/chttp2/transport/stream_map.h
@@ -31,8 +31,8 @@
  *
  */
 
-#ifndef GRPC_CORE_LIB_TRANSPORT_CHTTP2_STREAM_MAP_H
-#define GRPC_CORE_LIB_TRANSPORT_CHTTP2_STREAM_MAP_H
+#ifndef GRPC_CORE_EXT_TRANSPORT_CHTTP2_TRANSPORT_STREAM_MAP_H
+#define GRPC_CORE_EXT_TRANSPORT_CHTTP2_TRANSPORT_STREAM_MAP_H
 
 #include <grpc/support/port_platform.h>
 
@@ -81,4 +81,4 @@ void grpc_chttp2_stream_map_for_each(grpc_chttp2_stream_map *map,
                                                void *value),
                                      void *user_data);
 
-#endif /* GRPC_CORE_LIB_TRANSPORT_CHTTP2_STREAM_MAP_H */
+#endif /* GRPC_CORE_EXT_TRANSPORT_CHTTP2_TRANSPORT_STREAM_MAP_H */
diff --git a/src/core/lib/transport/chttp2/timeout_encoding.c b/src/core/ext/transport/chttp2/transport/timeout_encoding.c
index 0edacaafd3..d5b9da9252 100644
--- a/src/core/lib/transport/chttp2/timeout_encoding.c
+++ b/src/core/ext/transport/chttp2/transport/timeout_encoding.c
@@ -31,7 +31,7 @@
  *
  */
 
-#include "src/core/lib/transport/chttp2/timeout_encoding.h"
+#include "src/core/ext/transport/chttp2/transport/timeout_encoding.h"
 
 #include <stdio.h>
 #include <string.h>
diff --git a/src/core/lib/transport/chttp2/timeout_encoding.h b/src/core/ext/transport/chttp2/transport/timeout_encoding.h
index 731beb5a37..dc64f9cc3f 100644
--- a/src/core/lib/transport/chttp2/timeout_encoding.h
+++ b/src/core/ext/transport/chttp2/transport/timeout_encoding.h
@@ -31,8 +31,8 @@
  *
  */
 
-#ifndef GRPC_CORE_LIB_TRANSPORT_CHTTP2_TIMEOUT_ENCODING_H
-#define GRPC_CORE_LIB_TRANSPORT_CHTTP2_TIMEOUT_ENCODING_H
+#ifndef GRPC_CORE_EXT_TRANSPORT_CHTTP2_TRANSPORT_TIMEOUT_ENCODING_H
+#define GRPC_CORE_EXT_TRANSPORT_CHTTP2_TRANSPORT_TIMEOUT_ENCODING_H
 
 #include <grpc/support/time.h>
 #include "src/core/lib/support/string.h"
@@ -44,4 +44,4 @@
 void grpc_chttp2_encode_timeout(gpr_timespec timeout, char *buffer);
 int grpc_chttp2_decode_timeout(const char *buffer, gpr_timespec *timeout);
 
-#endif /* GRPC_CORE_LIB_TRANSPORT_CHTTP2_TIMEOUT_ENCODING_H */
+#endif /* GRPC_CORE_EXT_TRANSPORT_CHTTP2_TRANSPORT_TIMEOUT_ENCODING_H */
diff --git a/src/core/lib/transport/chttp2/varint.c b/src/core/ext/transport/chttp2/transport/varint.c
index 6dfef45362..6721d042a2 100644
--- a/src/core/lib/transport/chttp2/varint.c
+++ b/src/core/ext/transport/chttp2/transport/varint.c
@@ -31,7 +31,7 @@
  *
  */
 
-#include "src/core/lib/transport/chttp2/varint.h"
+#include "src/core/ext/transport/chttp2/transport/varint.h"
 
 uint32_t grpc_chttp2_hpack_varint_length(uint32_t tail_value) {
   if (tail_value < (1 << 7)) {
diff --git a/src/core/lib/transport/chttp2/varint.h b/src/core/ext/transport/chttp2/transport/varint.h
index e4a0ae3c22..6442ea3c5a 100644
--- a/src/core/lib/transport/chttp2/varint.h
+++ b/src/core/ext/transport/chttp2/transport/varint.h
@@ -31,8 +31,8 @@
  *
  */
 
-#ifndef GRPC_CORE_LIB_TRANSPORT_CHTTP2_VARINT_H
-#define GRPC_CORE_LIB_TRANSPORT_CHTTP2_VARINT_H
+#ifndef GRPC_CORE_EXT_TRANSPORT_CHTTP2_TRANSPORT_VARINT_H
+#define GRPC_CORE_EXT_TRANSPORT_CHTTP2_TRANSPORT_VARINT_H
 
 #include <grpc/support/port_platform.h>
 
@@ -72,4 +72,4 @@ void grpc_chttp2_hpack_write_varint_tail(uint32_t tail_value, uint8_t* target,
     }                                                                         \
   } while (0)
 
-#endif /* GRPC_CORE_LIB_TRANSPORT_CHTTP2_VARINT_H */
+#endif /* GRPC_CORE_EXT_TRANSPORT_CHTTP2_TRANSPORT_VARINT_H */
diff --git a/src/core/lib/transport/chttp2/writing.c b/src/core/ext/transport/chttp2/transport/writing.c
index daea331d31..8d5886f225 100644
--- a/src/core/lib/transport/chttp2/writing.c
+++ b/src/core/ext/transport/chttp2/transport/writing.c
@@ -31,14 +31,14 @@
  *
  */
 
-#include "src/core/lib/transport/chttp2/internal.h"
+#include "src/core/ext/transport/chttp2/transport/internal.h"
 
 #include <limits.h>
 
 #include <grpc/support/log.h>
 
+#include "src/core/ext/transport/chttp2/transport/http2_errors.h"
 #include "src/core/lib/profiling/timers.h"
-#include "src/core/lib/transport/chttp2/http2_errors.h"
 
 static void finalize_outbuf(grpc_exec_ctx *exec_ctx,
                             grpc_chttp2_transport_writing *transport_writing);
diff --git a/src/core/lib/iomgr/socket_utils_common_posix.c b/src/core/lib/iomgr/socket_utils_common_posix.c
index 9dbc2784e4..b433aee7fa 100644
--- a/src/core/lib/iomgr/socket_utils_common_posix.c
+++ b/src/core/lib/iomgr/socket_utils_common_posix.c
@@ -89,6 +89,28 @@ int grpc_set_socket_no_sigpipe_if_possible(int fd) {
 #endif
 }
 
+int grpc_set_socket_ip_pktinfo_if_possible(int fd) {
+#ifdef GPR_HAVE_IP_PKTINFO
+  int get_local_ip = 1;
+  return 0 == setsockopt(fd, IPPROTO_IP, IP_PKTINFO, &get_local_ip,
+                         sizeof(get_local_ip));
+#else
+  (void)fd;
+  return 1;
+#endif
+}
+
+int grpc_set_socket_ipv6_recvpktinfo_if_possible(int fd) {
+#ifdef GPR_HAVE_IPV6_RECVPKTINFO
+  int get_local_ip = 1;
+  return 0 == setsockopt(fd, IPPROTO_IPV6, IPV6_RECVPKTINFO, &get_local_ip,
+                         sizeof(get_local_ip));
+#else
+  (void)fd;
+  return 1;
+#endif
+}
+
 /* set a socket to close on exec */
 int grpc_set_socket_cloexec(int fd, int close_on_exec) {
   int oldflags = fcntl(fd, F_GETFD, 0);
diff --git a/src/core/lib/iomgr/socket_utils_posix.h b/src/core/lib/iomgr/socket_utils_posix.h
index 063f298d72..f73ad6317d 100644
--- a/src/core/lib/iomgr/socket_utils_posix.h
+++ b/src/core/lib/iomgr/socket_utils_posix.h
@@ -68,6 +68,16 @@ int grpc_ipv6_loopback_available(void);
    If SO_NO_SIGPIPE is not available, returns 1. */
 int grpc_set_socket_no_sigpipe_if_possible(int fd);
 
+/* Tries to set IP_PKTINFO if available on this platform.
+   Returns 1 on success, 0 on failure.
+   If IP_PKTINFO is not available, returns 1. */
+int grpc_set_socket_ip_pktinfo_if_possible(int fd);
+
+/* Tries to set IPV6_RECVPKTINFO if available on this platform.
+   Returns 1 on success, 0 on failure.
+   If IPV6_RECVPKTINFO is not available, returns 1. */
+int grpc_set_socket_ipv6_recvpktinfo_if_possible(int fd);
+
 /* An enum to keep track of IPv4/IPv6 socket modes.
 
    Currently, this information is only used when a socket is first created, but
diff --git a/src/core/lib/iomgr/udp_server.c b/src/core/lib/iomgr/udp_server.c
index 3d8bcc9c81..9068109c3a 100644
--- a/src/core/lib/iomgr/udp_server.c
+++ b/src/core/lib/iomgr/udp_server.c
@@ -208,8 +208,6 @@ static int prepare_socket(int fd, const struct sockaddr *addr,
                           size_t addr_len) {
   struct sockaddr_storage sockname_temp;
   socklen_t sockname_len;
-  int get_local_ip;
-  int rc;
 
   if (fd < 0) {
     goto error;
@@ -220,14 +218,9 @@ static int prepare_socket(int fd, const struct sockaddr *addr,
             strerror(errno));
   }
 
-  get_local_ip = 1;
-  rc = setsockopt(fd, IPPROTO_IP, IP_PKTINFO, &get_local_ip,
-                  sizeof(get_local_ip));
-  if (rc == 0 && addr->sa_family == AF_INET6) {
-#if !defined(__APPLE__)
-    rc = setsockopt(fd, IPPROTO_IPV6, IPV6_RECVPKTINFO, &get_local_ip,
-                    sizeof(get_local_ip));
-#endif
+  if (grpc_set_socket_ip_pktinfo_if_possible(fd) &&
+      addr->sa_family == AF_INET6) {
+    grpc_set_socket_ipv6_recvpktinfo_if_possible(fd);
   }
 
   GPR_ASSERT(addr_len < ~(socklen_t)0);
diff --git a/src/core/lib/security/client_auth_filter.c b/src/core/lib/security/client_auth_filter.c
index b9e5bf0339..af6073e560 100644
--- a/src/core/lib/security/client_auth_filter.c
+++ b/src/core/lib/security/client_auth_filter.c
@@ -172,7 +172,7 @@ static void send_security_metadata(grpc_exec_ctx *exec_ctx,
     calld->creds = grpc_composite_call_credentials_create(channel_call_creds,
                                                           ctx->creds, NULL);
     if (calld->creds == NULL) {
-      bubble_up_error(exec_ctx, elem, GRPC_STATUS_INVALID_ARGUMENT,
+      bubble_up_error(exec_ctx, elem, GRPC_STATUS_INTERNAL,
                       "Incompatible credentials set on channel and call.");
       return;
     }
@@ -201,7 +201,7 @@ static void on_host_checked(grpc_exec_ctx *exec_ctx, void *user_data,
     char *error_msg;
     gpr_asprintf(&error_msg, "Invalid host %s set in :authority metadata.",
                  grpc_mdstr_as_c_string(calld->host));
-    bubble_up_error(exec_ctx, elem, GRPC_STATUS_INVALID_ARGUMENT, error_msg);
+    bubble_up_error(exec_ctx, elem, GRPC_STATUS_INTERNAL, error_msg);
     gpr_free(error_msg);
   }
 }
diff --git a/src/core/lib/security/security_connector.c b/src/core/lib/security/security_connector.c
index 5474bc3a9e..48b23a9dcf 100644
--- a/src/core/lib/security/security_connector.c
+++ b/src/core/lib/security/security_connector.c
@@ -42,6 +42,7 @@
 #include <grpc/support/slice_buffer.h>
 #include <grpc/support/string_util.h>
 
+#include "src/core/ext/transport/chttp2/transport/alpn.h"
 #include "src/core/lib/security/credentials.h"
 #include "src/core/lib/security/handshake.h"
 #include "src/core/lib/security/secure_endpoint.h"
@@ -49,7 +50,6 @@
 #include "src/core/lib/support/env.h"
 #include "src/core/lib/support/load_file.h"
 #include "src/core/lib/support/string.h"
-#include "src/core/lib/transport/chttp2/alpn.h"
 #include "src/core/lib/tsi/fake_transport_security.h"
 #include "src/core/lib/tsi/ssl_transport_security.h"
 
diff --git a/src/core/lib/surface/init.c b/src/core/lib/surface/init.c
index dcb9c62d36..dbfc8a9336 100644
--- a/src/core/lib/surface/init.c
+++ b/src/core/lib/surface/init.c
@@ -40,6 +40,7 @@
 #include <grpc/support/alloc.h>
 #include <grpc/support/time.h>
 /* TODO(ctiller): find another way? - better not to include census here */
+#include "src/core/ext/transport/chttp2/transport/chttp2_transport.h"
 #include "src/core/lib/census/grpc_plugin.h"
 #include "src/core/lib/channel/channel_stack.h"
 #include "src/core/lib/channel/client_channel.h"
@@ -67,7 +68,6 @@
 #include "src/core/lib/surface/lame_client.h"
 #include "src/core/lib/surface/server.h"
 #include "src/core/lib/surface/surface_trace.h"
-#include "src/core/lib/transport/chttp2_transport.h"
 #include "src/core/lib/transport/connectivity_state.h"
 #include "src/core/lib/transport/transport_impl.h"
 
diff --git a/src/core/lib/transport/metadata.c b/src/core/lib/transport/metadata.c
index 7605f09991..451c8d1cd3 100644
--- a/src/core/lib/transport/metadata.c
+++ b/src/core/lib/transport/metadata.c
@@ -44,11 +44,11 @@
 #include <grpc/support/string_util.h>
 #include <grpc/support/time.h>
 
+#include "src/core/ext/transport/chttp2/transport/bin_encoder.h"
 #include "src/core/lib/iomgr/iomgr_internal.h"
 #include "src/core/lib/profiling/timers.h"
 #include "src/core/lib/support/murmur_hash.h"
 #include "src/core/lib/support/string.h"
-#include "src/core/lib/transport/chttp2/bin_encoder.h"
 #include "src/core/lib/transport/static_metadata.h"
 
 /* There are two kinds of mdelem and mdstr instances.
diff --git a/src/node/index.js b/src/node/index.js
index 1c197729d7..6567d56260 100644
--- a/src/node/index.js
+++ b/src/node/index.js
@@ -87,6 +87,10 @@ var loadObject = exports.loadObject;
  *   Buffers. Defaults to false
  * - longsAsStrings: deserialize long values as strings instead of objects.
  *   Defaults to true
+ * - deprecatedArgumentOrder: Use the beta method argument order for client
+ *   methods, with optional arguments after the callback. Defaults to false.
+ *   This option is only a temporary stopgap measure to smooth an API breakage.
+ *   It is deprecated, and new code should not use it.
  * @param {string|{root: string, file: string}} filename The file to load
  * @param {string=} format The file format to expect. Must be either 'proto' or
  *     'json'. Defaults to 'proto'
diff --git a/src/node/interop/interop_client.js b/src/node/interop/interop_client.js
index 5602011a8e..ac0eddcf45 100644
--- a/src/node/interop/interop_client.js
+++ b/src/node/interop/interop_client.js
@@ -286,7 +286,7 @@ function cancelAfterFirstResponse(client, done) {
 function timeoutOnSleepingServer(client, done) {
   var deadline = new Date();
   deadline.setMilliseconds(deadline.getMilliseconds() + 1);
-  var call = client.fullDuplexCall(null, {deadline: deadline});
+  var call = client.fullDuplexCall({deadline: deadline});
   call.write({
     payload: {body: zeroBuffer(27182)}
   });
@@ -316,10 +316,10 @@ function customMetadata(client, done) {
       body: zeroBuffer(271828)
     }
   };
-  var unary = client.unaryCall(arg, function(err, resp) {
+  var unary = client.unaryCall(arg, metadata, function(err, resp) {
     assert.ifError(err);
     done();
-  }, metadata);
+  });
   unary.on('metadata', function(metadata) {
     assert.deepEqual(metadata.get(ECHO_INITIAL_KEY),
                      ['test_initial_metadata_value']);
@@ -455,14 +455,14 @@ function perRpcAuthTest(client, done, extra) {
       credential = credential.createScoped(scope);
     }
     var creds = grpc.credentials.createFromGoogleCredential(credential);
-    client.unaryCall(arg, function(err, resp) {
+    client.unaryCall(arg, {credentials: creds}, function(err, resp) {
       assert.ifError(err);
       assert.strictEqual(resp.username, SERVICE_ACCOUNT_EMAIL);
       assert(extra.oauth_scope.indexOf(resp.oauth_scope) > -1);
       if (done) {
         done();
       }
-    }, null, {credentials: creds});
+    });
   });
 }
 
diff --git a/src/node/src/client.js b/src/node/src/client.js
index 2459e28321..82142379da 100644
--- a/src/node/src/client.js
+++ b/src/node/src/client.js
@@ -50,6 +50,7 @@
 'use strict';
 
 var _ = require('lodash');
+var arguejs = require('arguejs');
 
 var grpc = require('./grpc_extension');
 
@@ -353,21 +354,23 @@ function makeUnaryRequestFunction(method, serialize, deserialize) {
    * @this {Client} Client object. Must have a channel member.
    * @param {*} argument The argument to the call. Should be serializable with
    *     serialize
-   * @param {function(?Error, value=)} callback The callback to for when the
-   *     response is received
    * @param {Metadata=} metadata Metadata to add to the call
    * @param {Object=} options Options map
+   * @param {function(?Error, value=)} callback The callback to for when the
+   *     response is received
    * @return {EventEmitter} An event emitter for stream related events
    */
-  function makeUnaryRequest(argument, callback, metadata, options) {
+  function makeUnaryRequest(argument, metadata, options, callback) {
     /* jshint validthis: true */
+    /* While the arguments are listed in the function signature, those variables
+     * are not used directly. Instead, ArgueJS processes the arguments
+     * object. This allows for simple handling of optional arguments in the
+     * middle of the argument list, and also provides type checking. */
+    var args = arguejs({argument: null, metadata: [Metadata, new Metadata()],
+                        options: [Object], callback: Function}, arguments);
     var emitter = new EventEmitter();
-    var call = getCall(this.$channel, method, options);
-    if (metadata === null || metadata === undefined) {
-      metadata = new Metadata();
-    } else {
-      metadata = metadata.clone();
-    }
+    var call = getCall(this.$channel, method, args.options);
+    metadata = args.metadata.clone();
     emitter.cancel = function cancel() {
       call.cancel();
     };
@@ -375,9 +378,9 @@ function makeUnaryRequestFunction(method, serialize, deserialize) {
       return call.getPeer();
     };
     var client_batch = {};
-    var message = serialize(argument);
-    if (options) {
-      message.grpcWriteFlags = options.flags;
+    var message = serialize(args.argument);
+    if (args.options) {
+      message.grpcWriteFlags = args.options.flags;
     }
     client_batch[grpc.opType.SEND_INITIAL_METADATA] =
         metadata._getCoreRepresentation();
@@ -395,7 +398,7 @@ function makeUnaryRequestFunction(method, serialize, deserialize) {
       if (status.code === grpc.status.OK) {
         if (err) {
           // Got a batch error, but OK status. Something went wrong
-          callback(err);
+          args.callback(err);
           return;
         } else {
           try {
@@ -414,9 +417,9 @@ function makeUnaryRequestFunction(method, serialize, deserialize) {
         error = new Error(status.details);
         error.code = status.code;
         error.metadata = status.metadata;
-        callback(error);
+        args.callback(error);
       } else {
-        callback(null, deserialized);
+        args.callback(null, deserialized);
       }
       emitter.emit('status', status);
       emitter.emit('metadata', Metadata._fromCoreRepresentation(
@@ -440,21 +443,23 @@ function makeClientStreamRequestFunction(method, serialize, deserialize) {
    * Make a client stream request with this method on the given channel with the
    * given callback, etc.
    * @this {Client} Client object. Must have a channel member.
-   * @param {function(?Error, value=)} callback The callback to for when the
-   *     response is received
    * @param {Metadata=} metadata Array of metadata key/value pairs to add to the
    *     call
    * @param {Object=} options Options map
+   * @param {function(?Error, value=)} callback The callback to for when the
+   *     response is received
    * @return {EventEmitter} An event emitter for stream related events
    */
-  function makeClientStreamRequest(callback, metadata, options) {
+  function makeClientStreamRequest(metadata, options, callback) {
     /* jshint validthis: true */
-    var call = getCall(this.$channel, method, options);
-    if (metadata === null || metadata === undefined) {
-      metadata = new Metadata();
-    } else {
-      metadata = metadata.clone();
-    }
+    /* While the arguments are listed in the function signature, those variables
+     * are not used directly. Instead, ArgueJS processes the arguments
+     * object. This allows for simple handling of optional arguments in the
+     * middle of the argument list, and also provides type checking. */
+    var args = arguejs({metadata: [Metadata, new Metadata()],
+                        options: [Object], callback: Function}, arguments);
+    var call = getCall(this.$channel, method, args.options);
+    metadata = args.metadata.clone();
     var stream = new ClientWritableStream(call, serialize);
     var metadata_batch = {};
     metadata_batch[grpc.opType.SEND_INITIAL_METADATA] =
@@ -481,7 +486,7 @@ function makeClientStreamRequestFunction(method, serialize, deserialize) {
       if (status.code === grpc.status.OK) {
         if (err) {
           // Got a batch error, but OK status. Something went wrong
-          callback(err);
+          args.callback(err);
           return;
         } else {
           try {
@@ -500,9 +505,9 @@ function makeClientStreamRequestFunction(method, serialize, deserialize) {
         error = new Error(response.status.details);
         error.code = status.code;
         error.metadata = status.metadata;
-        callback(error);
+        args.callback(error);
       } else {
-        callback(null, deserialized);
+        args.callback(null, deserialized);
       }
       stream.emit('status', status);
     });
@@ -533,17 +538,18 @@ function makeServerStreamRequestFunction(method, serialize, deserialize) {
    */
   function makeServerStreamRequest(argument, metadata, options) {
     /* jshint validthis: true */
-    var call = getCall(this.$channel, method, options);
-    if (metadata === null || metadata === undefined) {
-      metadata = new Metadata();
-    } else {
-      metadata = metadata.clone();
-    }
+    /* While the arguments are listed in the function signature, those variables
+     * are not used directly. Instead, ArgueJS processes the arguments
+     * object. */
+    var args = arguejs({argument: null, metadata: [Metadata, new Metadata()],
+                        options: [Object]}, arguments);
+    var call = getCall(this.$channel, method, args.options);
+    metadata = args.metadata.clone();
     var stream = new ClientReadableStream(call, deserialize);
     var start_batch = {};
-    var message = serialize(argument);
-    if (options) {
-      message.grpcWriteFlags = options.flags;
+    var message = serialize(args.argument);
+    if (args.options) {
+      message.grpcWriteFlags = args.options.flags;
     }
     start_batch[grpc.opType.SEND_INITIAL_METADATA] =
         metadata._getCoreRepresentation();
@@ -595,12 +601,13 @@ function makeBidiStreamRequestFunction(method, serialize, deserialize) {
    */
   function makeBidiStreamRequest(metadata, options) {
     /* jshint validthis: true */
-    var call = getCall(this.$channel, method, options);
-    if (metadata === null || metadata === undefined) {
-      metadata = new Metadata();
-    } else {
-      metadata = metadata.clone();
-    }
+    /* While the arguments are listed in the function signature, those variables
+     * are not used directly. Instead, ArgueJS processes the arguments
+     * object. */
+    var args = arguejs({metadata: [Metadata, new Metadata()],
+                        options: [Object]}, arguments);
+    var call = getCall(this.$channel, method, args.options);
+    metadata = args.metadata.clone();
     var stream = new ClientDuplexStream(call, serialize, deserialize);
     var start_batch = {};
     start_batch[grpc.opType.SEND_INITIAL_METADATA] =
@@ -643,6 +650,40 @@ var requester_makers = {
   bidi: makeBidiStreamRequestFunction
 };
 
+function getDefaultValues(metadata, options) {
+  var res = {};
+  res.metadata = metadata || new Metadata();
+  res.options = options || {};
+  return res;
+}
+
+/**
+ * Map with wrappers for each type of requester function to make it use the old
+ * argument order with optional arguments after the callback.
+ */
+var deprecated_request_wrap = {
+  unary: function(makeUnaryRequest) {
+    return function makeWrappedUnaryRequest(argument, callback,
+                                            metadata, options) {
+      /* jshint validthis: true */
+      var opt_args = getDefaultValues(metadata, metadata);
+      return makeUnaryRequest.call(this, argument, opt_args.metadata,
+                                   opt_args.options, callback);
+    };
+  },
+  client_stream: function(makeServerStreamRequest) {
+    return function makeWrappedClientStreamRequest(callback, metadata,
+                                                   options) {
+      /* jshint validthis: true */
+      var opt_args = getDefaultValues(metadata, options);
+      return makeServerStreamRequest.call(this, opt_args.metadata,
+                                          opt_args.options, callback);
+    };
+  },
+  server_stream: _.identity,
+  bidi: _.identity
+};
+
 /**
  * Creates a constructor for a client with the given methods. The methods object
  * maps method name to an object with the following keys:
@@ -654,9 +695,19 @@ var requester_makers = {
  * responseDeserialize: function to deserialize response objects
  * @param {Object} methods An object mapping method names to method attributes
  * @param {string} serviceName The fully qualified name of the service
+ * @param {Object} class_options An options object. Currently only uses the key
+ *     deprecatedArgumentOrder, a boolean that Indicates that the old argument
+ *     order should be used for methods, with optional arguments at the end
+ *     instead of the callback at the end. Defaults to false. This option is
+ *     only a temporary stopgap measure to smooth an API breakage.
+ *     It is deprecated, and new code should not use it.
  * @return {function(string, Object)} New client constructor
  */
-exports.makeClientConstructor = function(methods, serviceName) {
+exports.makeClientConstructor = function(methods, serviceName,
+                                         class_options) {
+  if (!class_options) {
+    class_options = {};
+  }
   /**
    * Create a client with the given methods
    * @constructor
@@ -703,8 +754,13 @@ exports.makeClientConstructor = function(methods, serviceName) {
     }
     var serialize = attrs.requestSerialize;
     var deserialize = attrs.responseDeserialize;
-    Client.prototype[name] = requester_makers[method_type](
+    var method_func = requester_makers[method_type](
         attrs.path, serialize, deserialize);
+    if (class_options.deprecatedArgumentOrder) {
+      Client.prototype[name] = deprecated_request_wrap(method_func);
+    } else {
+      Client.prototype[name] = method_func;
+    }
     // Associate all provided attributes with the method
     _.assign(Client.prototype[name], attrs);
   });
@@ -761,8 +817,13 @@ exports.waitForClientReady = function(client, deadline, callback) {
 exports.makeProtobufClientConstructor =  function(service, options) {
   var method_attrs = common.getProtobufServiceAttrs(service, service.name,
                                                     options);
+  var deprecatedArgumentOrder = false;
+  if (options) {
+    deprecatedArgumentOrder = options.deprecatedArgumentOrder;
+  }
   var Client = exports.makeClientConstructor(
-      method_attrs, common.fullyQualifiedName(service));
+      method_attrs, common.fullyQualifiedName(service),
+      deprecatedArgumentOrder);
   Client.service = service;
   Client.service.grpc_options = options;
   return Client;
diff --git a/src/node/test/credentials_test.js b/src/node/test/credentials_test.js
index 294600c85a..73eadfab2c 100644
--- a/src/node/test/credentials_test.js
+++ b/src/node/test/credentials_test.js
@@ -1,6 +1,6 @@
 /*
  *
- * Copyright 2015, Google Inc.
+ * Copyright 2015-2016, Google Inc.
  * All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
@@ -398,18 +398,20 @@ describe('client credentials', function() {
           metadataUpdater);
     });
     it('Should update metadata on a unary call', function(done) {
-      var call = client.unary({}, function(err, data) {
-        assert.ifError(err);
-      }, null, {credentials: updater_creds});
+      var call = client.unary({}, {credentials: updater_creds},
+                              function(err, data) {
+                                assert.ifError(err);
+                              });
       call.on('metadata', function(metadata) {
         assert.deepEqual(metadata.get('plugin_key'), ['plugin_value']);
         done();
       });
     });
     it('should update metadata on a client streaming call', function(done) {
-      var call = client.clientStream(function(err, data) {
-        assert.ifError(err);
-      }, null, {credentials: updater_creds});
+      var call = client.clientStream({credentials: updater_creds},
+                                     function(err, data) {
+                                       assert.ifError(err);
+                                     });
       call.on('metadata', function(metadata) {
         assert.deepEqual(metadata.get('plugin_key'), ['plugin_value']);
         done();
@@ -417,7 +419,7 @@ describe('client credentials', function() {
       call.end();
     });
     it('should update metadata on a server streaming call', function(done) {
-      var call = client.serverStream({}, null, {credentials: updater_creds});
+      var call = client.serverStream({}, {credentials: updater_creds});
       call.on('data', function() {});
       call.on('metadata', function(metadata) {
         assert.deepEqual(metadata.get('plugin_key'), ['plugin_value']);
@@ -425,7 +427,7 @@ describe('client credentials', function() {
       });
     });
     it('should update metadata on a bidi streaming call', function(done) {
-      var call = client.bidiStream(null, {credentials: updater_creds});
+      var call = client.bidiStream({credentials: updater_creds});
       call.on('data', function() {});
       call.on('metadata', function(metadata) {
         assert.deepEqual(metadata.get('plugin_key'), ['plugin_value']);
@@ -443,9 +445,10 @@ describe('client credentials', function() {
           altMetadataUpdater);
       var combined_updater = grpc.credentials.combineCallCredentials(
           updater_creds, alt_updater_creds);
-      var call = client.unary({}, function(err, data) {
-        assert.ifError(err);
-      }, null, {credentials: combined_updater});
+      var call = client.unary({}, {credentials: combined_updater},
+                              function(err, data) {
+                                assert.ifError(err);
+                              });
       call.on('metadata', function(metadata) {
         assert.deepEqual(metadata.get('plugin_key'), ['plugin_value']);
         assert.deepEqual(metadata.get('other_plugin_key'),
diff --git a/src/node/test/surface_test.js b/src/node/test/surface_test.js
index edbfc0a288..5a704ee133 100644
--- a/src/node/test/surface_test.js
+++ b/src/node/test/surface_test.js
@@ -404,18 +404,18 @@ describe('Echo metadata', function() {
     server.forceShutdown();
   });
   it('with unary call', function(done) {
-    var call = client.unary({}, function(err, data) {
+    var call = client.unary({}, metadata, function(err, data) {
       assert.ifError(err);
-    }, metadata);
+    });
     call.on('metadata', function(metadata) {
       assert.deepEqual(metadata.get('key'), ['value']);
       done();
     });
   });
   it('with client stream call', function(done) {
-    var call = client.clientStream(function(err, data) {
+    var call = client.clientStream(metadata, function(err, data) {
       assert.ifError(err);
-    }, metadata);
+    });
     call.on('metadata', function(metadata) {
       assert.deepEqual(metadata.get('key'), ['value']);
       done();
@@ -441,8 +441,8 @@ describe('Echo metadata', function() {
   });
   it('shows the correct user-agent string', function(done) {
     var version = require('../../../package.json').version;
-    var call = client.unary({}, function(err, data) { assert.ifError(err); },
-                            metadata);
+    var call = client.unary({}, metadata,
+                            function(err, data) { assert.ifError(err); });
     call.on('metadata', function(metadata) {
       assert(_.startsWith(metadata.get('user-agent')[0],
                           'grpc-node/' + version));
@@ -452,8 +452,8 @@ describe('Echo metadata', function() {
   it('properly handles duplicate values', function(done) {
     var dup_metadata = metadata.clone();
     dup_metadata.add('key', 'value2');
-    var call = client.unary({}, function(err, data) {assert.ifError(err); },
-                            dup_metadata);
+    var call = client.unary({}, dup_metadata,
+                            function(err, data) {assert.ifError(err); });
     call.on('metadata', function(resp_metadata) {
       // Two arrays are equal iff their symmetric difference is empty
       assert.deepEqual(_.xor(dup_metadata.get('key'), resp_metadata.get('key')),
@@ -954,7 +954,7 @@ describe('Call propagation', function() {
       done = multiDone(done, 2);
       var call;
       proxy_impl.unary = function(parent, callback) {
-        client.unary(parent.request, function(err, value) {
+        client.unary(parent.request, {parent: parent}, function(err, value) {
           try {
             assert(err);
             assert.strictEqual(err.code, grpc.status.CANCELLED);
@@ -962,7 +962,7 @@ describe('Call propagation', function() {
             callback(err, value);
             done();
           }
-        }, null, {parent: parent});
+        });
         call.cancel();
       };
       proxy.addProtoService(test_service, proxy_impl);
@@ -976,7 +976,7 @@ describe('Call propagation', function() {
       done = multiDone(done, 2);
       var call;
       proxy_impl.clientStream = function(parent, callback) {
-        client.clientStream(function(err, value) {
+        client.clientStream({parent: parent}, function(err, value) {
           try {
             assert(err);
             assert.strictEqual(err.code, grpc.status.CANCELLED);
@@ -984,7 +984,7 @@ describe('Call propagation', function() {
             callback(err, value);
             done();
           }
-        }, null, {parent: parent});
+        });
         call.cancel();
       };
       proxy.addProtoService(test_service, proxy_impl);
@@ -998,8 +998,7 @@ describe('Call propagation', function() {
       done = multiDone(done, 2);
       var call;
       proxy_impl.serverStream = function(parent) {
-        var child = client.serverStream(parent.request, null,
-                                        {parent: parent});
+        var child = client.serverStream(parent.request, {parent: parent});
         child.on('data', function() {});
         child.on('error', function(err) {
           assert(err);
@@ -1023,7 +1022,7 @@ describe('Call propagation', function() {
       done = multiDone(done, 2);
       var call;
       proxy_impl.bidiStream = function(parent) {
-        var child = client.bidiStream(null, {parent: parent});
+        var child = client.bidiStream({parent: parent});
         child.on('data', function() {});
         child.on('error', function(err) {
           assert(err);
@@ -1051,7 +1050,8 @@ describe('Call propagation', function() {
     it('With a client stream call', function(done) {
       done = multiDone(done, 2);
       proxy_impl.clientStream = function(parent, callback) {
-        client.clientStream(function(err, value) {
+        var options = {parent: parent, propagate_flags: deadline_flags};
+        client.clientStream(options, function(err, value) {
           try {
             assert(err);
             assert(err.code === grpc.status.DEADLINE_EXCEEDED ||
@@ -1060,7 +1060,7 @@ describe('Call propagation', function() {
             callback(err, value);
             done();
           }
-        }, null, {parent: parent, propagate_flags: deadline_flags});
+        });
       };
       proxy.addProtoService(test_service, proxy_impl);
       var proxy_port = proxy.bind('localhost:0', server_insecure_creds);
@@ -1069,15 +1069,15 @@ describe('Call propagation', function() {
                                     grpc.credentials.createInsecure());
       var deadline = new Date();
       deadline.setSeconds(deadline.getSeconds() + 1);
-      proxy_client.clientStream(function(err, value) {
+      proxy_client.clientStream({deadline: deadline}, function(err, value) {
         done();
-      }, null, {deadline: deadline});
+      });
     });
     it('With a bidi stream call', function(done) {
       done = multiDone(done, 2);
       proxy_impl.bidiStream = function(parent) {
         var child = client.bidiStream(
-            null, {parent: parent, propagate_flags: deadline_flags});
+            {parent: parent, propagate_flags: deadline_flags});
         child.on('data', function() {});
         child.on('error', function(err) {
           assert(err);
@@ -1093,7 +1093,7 @@ describe('Call propagation', function() {
                                     grpc.credentials.createInsecure());
       var deadline = new Date();
       deadline.setSeconds(deadline.getSeconds() + 1);
-      var call = proxy_client.bidiStream(null, {deadline: deadline});
+      var call = proxy_client.bidiStream({deadline: deadline});
       call.on('data', function() {});
       call.on('error', function(err) {
         done();
diff --git a/src/python/grpcio/grpc_core_dependencies.py b/src/python/grpcio/grpc_core_dependencies.py
index a5bc18af5e..3c57ad71da 100644
--- a/src/python/grpcio/grpc_core_dependencies.py
+++ b/src/python/grpcio/grpc_core_dependencies.py
@@ -74,9 +74,40 @@ CORE_SOURCE_FILES = [
   'src/core/lib/support/tmpfile_posix.c',
   'src/core/lib/support/tmpfile_win32.c',
   'src/core/lib/support/wrap_memcpy.c',
+  'src/core/ext/transport/chttp2/client/insecure/channel_create.c',
+  'src/core/ext/transport/chttp2/client/secure/secure_channel_create.c',
+  'src/core/ext/transport/chttp2/server/insecure/server_chttp2.c',
+  'src/core/ext/transport/chttp2/server/secure/server_secure_chttp2.c',
+  'src/core/ext/transport/chttp2/transport/alpn.c',
+  'src/core/ext/transport/chttp2/transport/bin_encoder.c',
+  'src/core/ext/transport/chttp2/transport/chttp2_transport.c',
+  'src/core/ext/transport/chttp2/transport/frame_data.c',
+  'src/core/ext/transport/chttp2/transport/frame_goaway.c',
+  'src/core/ext/transport/chttp2/transport/frame_ping.c',
+  'src/core/ext/transport/chttp2/transport/frame_rst_stream.c',
+  'src/core/ext/transport/chttp2/transport/frame_settings.c',
+  'src/core/ext/transport/chttp2/transport/frame_window_update.c',
+  'src/core/ext/transport/chttp2/transport/hpack_encoder.c',
+  'src/core/ext/transport/chttp2/transport/hpack_parser.c',
+  'src/core/ext/transport/chttp2/transport/hpack_table.c',
+  'src/core/ext/transport/chttp2/transport/huffsyms.c',
+  'src/core/ext/transport/chttp2/transport/incoming_metadata.c',
+  'src/core/ext/transport/chttp2/transport/parsing.c',
+  'src/core/ext/transport/chttp2/transport/status_conversion.c',
+  'src/core/ext/transport/chttp2/transport/stream_lists.c',
+  'src/core/ext/transport/chttp2/transport/stream_map.c',
+  'src/core/ext/transport/chttp2/transport/timeout_encoding.c',
+  'src/core/ext/transport/chttp2/transport/varint.c',
+  'src/core/ext/transport/chttp2/transport/writing.c',
+  'src/core/lib/census/context.c',
   'src/core/lib/census/grpc_context.c',
   'src/core/lib/census/grpc_filter.c',
   'src/core/lib/census/grpc_plugin.c',
+  'src/core/lib/census/initialize.c',
+  'src/core/lib/census/mlog.c',
+  'src/core/lib/census/operation.c',
+  'src/core/lib/census/placeholders.c',
+  'src/core/lib/census/tracing.c',
   'src/core/lib/channel/channel_args.c',
   'src/core/lib/channel/channel_stack.c',
   'src/core/lib/channel/channel_stack_builder.c',
@@ -110,6 +141,7 @@ CORE_SOURCE_FILES = [
   'src/core/lib/debug/trace.c',
   'src/core/lib/http/format_request.c',
   'src/core/lib/http/httpcli.c',
+  'src/core/lib/http/httpcli_security_connector.c',
   'src/core/lib/http/parser.c',
   'src/core/lib/iomgr/closure.c',
   'src/core/lib/iomgr/endpoint.c',
@@ -158,6 +190,20 @@ CORE_SOURCE_FILES = [
   'src/core/lib/json/json_string.c',
   'src/core/lib/json/json_writer.c',
   'src/core/lib/proto/grpc/lb/v0/load_balancer.pb.c',
+  'src/core/lib/security/b64.c',
+  'src/core/lib/security/client_auth_filter.c',
+  'src/core/lib/security/credentials.c',
+  'src/core/lib/security/credentials_metadata.c',
+  'src/core/lib/security/credentials_posix.c',
+  'src/core/lib/security/credentials_win32.c',
+  'src/core/lib/security/google_default_credentials.c',
+  'src/core/lib/security/handshake.c',
+  'src/core/lib/security/json_token.c',
+  'src/core/lib/security/jwt_verifier.c',
+  'src/core/lib/security/secure_endpoint.c',
+  'src/core/lib/security/security_connector.c',
+  'src/core/lib/security/security_context.c',
+  'src/core/lib/security/server_auth_filter.c',
   'src/core/lib/surface/alarm.c',
   'src/core/lib/surface/api_trace.c',
   'src/core/lib/surface/byte_buffer.c',
@@ -167,74 +213,28 @@ CORE_SOURCE_FILES = [
   'src/core/lib/surface/call_log_batch.c',
   'src/core/lib/surface/channel.c',
   'src/core/lib/surface/channel_connectivity.c',
-  'src/core/lib/surface/channel_create.c',
   'src/core/lib/surface/channel_init.c',
   'src/core/lib/surface/channel_ping.c',
   'src/core/lib/surface/channel_stack_type.c',
   'src/core/lib/surface/completion_queue.c',
   'src/core/lib/surface/event_string.c',
   'src/core/lib/surface/init.c',
+  'src/core/lib/surface/init_secure.c',
   'src/core/lib/surface/lame_client.c',
   'src/core/lib/surface/metadata_array.c',
   'src/core/lib/surface/server.c',
-  'src/core/lib/surface/server_chttp2.c',
   'src/core/lib/surface/validate_metadata.c',
   'src/core/lib/surface/version.c',
   'src/core/lib/transport/byte_stream.c',
-  'src/core/lib/transport/chttp2/alpn.c',
-  'src/core/lib/transport/chttp2/bin_encoder.c',
-  'src/core/lib/transport/chttp2/frame_data.c',
-  'src/core/lib/transport/chttp2/frame_goaway.c',
-  'src/core/lib/transport/chttp2/frame_ping.c',
-  'src/core/lib/transport/chttp2/frame_rst_stream.c',
-  'src/core/lib/transport/chttp2/frame_settings.c',
-  'src/core/lib/transport/chttp2/frame_window_update.c',
-  'src/core/lib/transport/chttp2/hpack_encoder.c',
-  'src/core/lib/transport/chttp2/hpack_parser.c',
-  'src/core/lib/transport/chttp2/hpack_table.c',
-  'src/core/lib/transport/chttp2/huffsyms.c',
-  'src/core/lib/transport/chttp2/incoming_metadata.c',
-  'src/core/lib/transport/chttp2/parsing.c',
-  'src/core/lib/transport/chttp2/status_conversion.c',
-  'src/core/lib/transport/chttp2/stream_lists.c',
-  'src/core/lib/transport/chttp2/stream_map.c',
-  'src/core/lib/transport/chttp2/timeout_encoding.c',
-  'src/core/lib/transport/chttp2/varint.c',
-  'src/core/lib/transport/chttp2/writing.c',
-  'src/core/lib/transport/chttp2_transport.c',
   'src/core/lib/transport/connectivity_state.c',
   'src/core/lib/transport/metadata.c',
   'src/core/lib/transport/metadata_batch.c',
   'src/core/lib/transport/static_metadata.c',
   'src/core/lib/transport/transport.c',
   'src/core/lib/transport/transport_op_string.c',
-  'src/core/lib/http/httpcli_security_connector.c',
-  'src/core/lib/security/b64.c',
-  'src/core/lib/security/client_auth_filter.c',
-  'src/core/lib/security/credentials.c',
-  'src/core/lib/security/credentials_metadata.c',
-  'src/core/lib/security/credentials_posix.c',
-  'src/core/lib/security/credentials_win32.c',
-  'src/core/lib/security/google_default_credentials.c',
-  'src/core/lib/security/handshake.c',
-  'src/core/lib/security/json_token.c',
-  'src/core/lib/security/jwt_verifier.c',
-  'src/core/lib/security/secure_endpoint.c',
-  'src/core/lib/security/security_connector.c',
-  'src/core/lib/security/security_context.c',
-  'src/core/lib/security/server_auth_filter.c',
-  'src/core/lib/security/server_secure_chttp2.c',
-  'src/core/lib/surface/init_secure.c',
-  'src/core/lib/surface/secure_channel_create.c',
   'src/core/lib/tsi/fake_transport_security.c',
   'src/core/lib/tsi/ssl_transport_security.c',
   'src/core/lib/tsi/transport_security.c',
-  'src/core/lib/census/context.c',
-  'src/core/lib/census/initialize.c',
-  'src/core/lib/census/mlog.c',
-  'src/core/lib/census/operation.c',
-  'src/core/lib/census/placeholders.c',
-  'src/core/lib/census/tracing.c',
   'third_party/nanopb/pb_common.c',
   'third_party/nanopb/pb_decode.c',
   'third_party/nanopb/pb_encode.c',