Merge pull request #6826 from makdharma/issue5548

fix for issue 5548. Deprecated old classes and created subclasses.
diff --git a/BUILD b/BUILD
index 3b1f04f..c9aed05 100644
--- a/BUILD
+++ b/BUILD
@@ -1212,8 +1212,8 @@
 cc_library(
   name = "grpc++",
   srcs = [
+    "include/grpc++/impl/codegen/core_codegen.h",
     "src/cpp/client/secure_credentials.h",
-    "src/cpp/common/core_codegen.h",
     "src/cpp/common/secure_auth_context.h",
     "src/cpp/server/secure_server_credentials.h",
     "src/cpp/client/create_channel_internal.h",
@@ -1262,6 +1262,7 @@
     "include/grpc++/grpc++.h",
     "include/grpc++/impl/call.h",
     "include/grpc++/impl/client_unary_call.h",
+    "include/grpc++/impl/codegen/core_codegen.h",
     "include/grpc++/impl/grpc_library.h",
     "include/grpc++/impl/method_handler_impl.h",
     "include/grpc++/impl/rpc_method.h",
@@ -1365,7 +1366,6 @@
   name = "grpc++_unsecure",
   srcs = [
     "src/cpp/client/create_channel_internal.h",
-    "src/cpp/common/core_codegen.h",
     "src/cpp/server/dynamic_thread_pool.h",
     "src/cpp/server/thread_pool_interface.h",
     "src/cpp/common/insecure_create_auth_context.cc",
@@ -1406,6 +1406,7 @@
     "include/grpc++/grpc++.h",
     "include/grpc++/impl/call.h",
     "include/grpc++/impl/client_unary_call.h",
+    "include/grpc++/impl/codegen/core_codegen.h",
     "include/grpc++/impl/grpc_library.h",
     "include/grpc++/impl/method_handler_impl.h",
     "include/grpc++/impl/rpc_method.h",
diff --git a/Makefile b/Makefile
index 5a5dd5e..fdbedfd 100644
--- a/Makefile
+++ b/Makefile
@@ -3453,6 +3453,7 @@
     include/grpc++/grpc++.h \
     include/grpc++/impl/call.h \
     include/grpc++/impl/client_unary_call.h \
+    include/grpc++/impl/codegen/core_codegen.h \
     include/grpc++/impl/grpc_library.h \
     include/grpc++/impl/method_handler_impl.h \
     include/grpc++/impl/rpc_method.h \
@@ -3808,6 +3809,7 @@
     include/grpc++/grpc++.h \
     include/grpc++/impl/call.h \
     include/grpc++/impl/client_unary_call.h \
+    include/grpc++/impl/codegen/core_codegen.h \
     include/grpc++/impl/grpc_library.h \
     include/grpc++/impl/method_handler_impl.h \
     include/grpc++/impl/rpc_method.h \
diff --git a/build.yaml b/build.yaml
index 302e3f9..8c09c55 100644
--- a/build.yaml
+++ b/build.yaml
@@ -637,6 +637,7 @@
   - include/grpc++/grpc++.h
   - include/grpc++/impl/call.h
   - include/grpc++/impl/client_unary_call.h
+  - include/grpc++/impl/codegen/core_codegen.h
   - include/grpc++/impl/grpc_library.h
   - include/grpc++/impl/method_handler_impl.h
   - include/grpc++/impl/rpc_method.h
@@ -673,7 +674,6 @@
   - include/grpc++/support/time.h
   headers:
   - src/cpp/client/create_channel_internal.h
-  - src/cpp/common/core_codegen.h
   - src/cpp/server/dynamic_thread_pool.h
   - src/cpp/server/thread_pool_interface.h
   src:
@@ -932,8 +932,8 @@
   build: all
   language: c++
   headers:
+  - include/grpc++/impl/codegen/core_codegen.h
   - src/cpp/client/secure_credentials.h
-  - src/cpp/common/core_codegen.h
   - src/cpp/common/secure_auth_context.h
   - src/cpp/server/secure_server_credentials.h
   src:
diff --git a/doc/interop-test-descriptions.md b/doc/interop-test-descriptions.md
index 6297b5c..7fd21c7 100644
--- a/doc/interop-test-descriptions.md
+++ b/doc/interop-test-descriptions.md
@@ -93,26 +93,24 @@
 ### large_compressed_unary
 
 This test verifies compressed unary calls succeed in sending messages. It
-sends one unary request for every combination of compression algorithm and
-payload type.
+sends one unary request for every payload type, with and without requesting a
+compressed response from the server.
 
 In all scenarios, whether compression was actually performed is determined by
-the compression bit in the response's message flags. The response's compression
-value indicates which algorithm was used if said compression bit is set.
+the compression bit in the response's message flags.
 
 
 Server features:
 * [UnaryCall][]
 * [Compressable Payload][]
 * [Uncompressable Payload][]
-* [Random Payload][]
 
 Procedure:
  1. Client calls UnaryCall with:
 
     ```
     {
-      response_compression: <one of {NONE, GZIP, DEFLATE}>
+      request_compressed_response: bool
       response_type: COMPRESSABLE
       response_size: 314159
       payload:{
@@ -123,11 +121,10 @@
     Client asserts:
     * call was successful
     * response payload type is COMPRESSABLE
-    * response compression is consistent with the requested one.
-    * if `response_compression == NONE`, the response MUST NOT have the
+    * if `request_compressed_response` is false, the response MUST NOT have the
       compressed message flag set.
-    * if `response_compression != NONE`, the response MUST have the compressed
-      message flag set.
+    * if `request_compressed_response` is true, the response MUST have the
+      compressed message flag set.
     * response payload body is 314159 bytes in size
     * clients are free to assert that the response payload body contents are
       zero and comparing the entire response message against a golden response
@@ -136,7 +133,7 @@
  2. Client calls UnaryCall with:
     ```
     {
-      response_compression: <one of {NONE, GZIP, DEFLATE}>
+      request_compressed_response: bool
       response_type: UNCOMPRESSABLE
       response_size: 314159
       payload:{
@@ -147,30 +144,12 @@
     Client asserts:
     * call was successful
     * response payload type is UNCOMPRESSABLE
-    * response compression is consistent with the requested one.
-    * the response MUST NOT have the compressed message flag set.
+    * the response MAY have the compressed message flag set. Some
+      implementations will choose to compress the payload even when the output
+      size if larger than the input.
     * response payload body is 314159 bytes in size
-    * clients are free to assert that the response payload body contents are
-      identical to the golden uncompressable data at `test/cpp/interop/rnd.dat`.
 
 
- 3. Client calls UnaryCall with:
-    ```
-    {
-      response_compression: <one of {NONE, GZIP, DEFLATE}>
-      response_type: RANDOM
-      response_size: 314159
-      payload:{
-        body: 271828 bytes of zeros
-      }
-    }
-    ```
-    Client asserts:
-    * call was successful
-    * response payload type is either COMPRESSABLE or UNCOMPRESSABLE
-    * the behavior is consistent with the randomly chosen incoming payload type,
-      as described in their respective sections.
-
 ### client_streaming
 
 This test verifies that client-only streaming succeeds.
@@ -245,7 +224,7 @@
         size: 31415
       }
       response_parameters:{
-        size: 9
+        size: 59
       }
       response_parameters:{
         size: 2653
@@ -272,7 +251,6 @@
 * [StreamingOutputCall][]
 * [Compressable Payload][]
 * [Uncompressable Payload][]
-* [Random Payload][]
 
 
 Procedure:
@@ -280,13 +258,13 @@
 
     ```
     {
-      response_compression: <one of {NONE, GZIP, DEFLATE}>
+      request_compressed_response: bool
       response_type:COMPRESSABLE
       response_parameters:{
         size: 31415
       }
       response_parameters:{
-        size: 9
+        size: 59
       }
       response_parameters:{
         size: 2653
@@ -301,12 +279,11 @@
     * call was successful
     * exactly four responses
     * response payloads are COMPRESSABLE
-    * response compression is consistent with the requested one.
-    * if `response_compression == NONE`, the response MUST NOT have the
-      compressed message flag set.
-    * if `response_compression != NONE`, the response MUST have the compressed
-      message flag set.
-    * response payload bodies are sized (in order): 31415, 9, 2653, 58979
+    * if `request_compressed_response` is false, the response's messages MUST
+      NOT have the compressed message flag set.
+    * if `request_compressed_response` is true, the response's messages MUST
+      have the compressed message flag set.
+    * response payload bodies are sized (in order): 31415, 59, 2653, 58979
     * clients are free to assert that the response payload body contents are
       zero and comparing the entire response messages against golden responses
 
@@ -315,13 +292,13 @@
 
     ```
     {
-      response_compression: <one of {NONE, GZIP, DEFLATE}>
+      request_compressed_response: bool
       response_type:UNCOMPRESSABLE
       response_parameters:{
         size: 31415
       }
       response_parameters:{
-        size: 9
+        size: 59
       }
       response_parameters:{
         size: 2653
@@ -336,40 +313,14 @@
     * call was successful
     * exactly four responses
     * response payloads are UNCOMPRESSABLE
-    * response compressions are consistent with the requested one.
-    * the responses MUST NOT have the compressed message flag set.
-    * response payload bodies are sized (in order): 31415, 9, 2653, 58979
+    * the response MAY have the compressed message flag set. Some
+      implementations will choose to compress the payload even when the output
+      size if larger than the input.
+    * response payload bodies are sized (in order): 31415, 59, 2653, 58979
     * clients are free to assert that the body of the responses are identical to
       the golden uncompressable data at `test/cpp/interop/rnd.dat`.
 
 
- 3. Client calls StreamingOutputCall with:
-
-    ```
-    {
-      response_compression: <one of {NONE, GZIP, DEFLATE}>
-      response_type:RANDOM
-      response_parameters:{
-        size: 31415
-      }
-      response_parameters:{
-        size: 9
-      }
-      response_parameters:{
-        size: 2653
-      }
-      response_parameters:{
-        size: 58979
-      }
-    }
-    ```
-
-    Client asserts:
-    * call was successful
-    * response payload type is either COMPRESSABLE or UNCOMPRESSABLE
-    * the behavior is consistent with the randomly chosen incoming payload type,
-      as described in their respective sections.
-
 ### ping_pong
 
 This test verifies that full duplex bidi is supported.
@@ -399,7 +350,7 @@
     {
       response_type: COMPRESSABLE
       response_parameters:{
-        size: 9
+        size: 59
       }
       payload:{
         body: 8 bytes of zeros
@@ -932,9 +883,9 @@
 [UnaryCall]: #unarycall
 
 Server implements UnaryCall which immediately returns a SimpleResponse with a
-payload body of size SimpleRequest.response_size bytes and type as appropriate
-for the SimpleRequest.response_type. If the server does not support the
-response_type, then it should fail the RPC with INVALID_ARGUMENT.
+payload body of size `SimpleRequest.response_size` bytes and type as appropriate
+for the `SimpleRequest.response_type`. If the server does not support the
+`response_type`, then it should fail the RPC with `INVALID_ARGUMENT`.
 
 ### StreamingInputCall
 [StreamingInputCall]: #streaminginputcall
@@ -974,15 +925,7 @@
 
 When the client requests UNCOMPRESSABLE payload, the response includes a payload
 of the size requested containing uncompressable data and the payload type is
-UNCOMPRESSABLE. A 512 kB dump from /dev/urandom is the current golden data,
-stored at `test/cpp/interop/rnd.dat`
-
-### Random Payload
-[Random Payload]: #random-payload
-
-When the client requests RANDOM payload, the response includes either a randomly
-chosen COMPRESSABLE or UNCOMPRESSABLE payload. The data and the payload type
-will be consistent with this choice.
+UNCOMPRESSABLE.
 
 ### Echo Status
 [Echo Status]: #echo-status
@@ -1004,8 +947,8 @@
 [Observe ResponseParameters.interval_us]: #observe-responseparametersinterval_us
 
 In StreamingOutputCall and FullDuplexCall, server delays sending a
-StreamingOutputCallResponse by the ResponseParameters's interval_us for that
-particular response, relative to the last response sent. That is, interval_us
+StreamingOutputCallResponse by the ResponseParameters's `interval_us` for that
+particular response, relative to the last response sent. That is, `interval_us`
 acts like a sleep *before* sending the response and accumulates from one
 response to the next.
 
@@ -1027,13 +970,13 @@
 #### Echo OAuth scope
 [Echo OAuth Scope]: #echo-oauth-scope
 
-If a SimpleRequest has fill_oauth_scope=true and that request was successfully
+If a SimpleRequest has `fill_oauth_scope=true` and that request was successfully
 authenticated via OAuth, then the SimpleResponse should have oauth_scope filled
 with the scope of the method being invoked.
 
 Although a general server-side feature, most test servers won't implement this
-feature. The TLS server grpc-test.sandbox.googleapis.com:443 supports this feature.
-It requires at least the OAuth scope
+feature. The TLS server `grpc-test.sandbox.googleapis.com:443` supports this
+feature. It requires at least the OAuth scope
 `https://www.googleapis.com/auth/xapi.zoo` for authentication to succeed.
 
 Discussion:
diff --git a/include/grpc++/impl/codegen/async_stream.h b/include/grpc++/impl/codegen/async_stream.h
index e2954e3..0606441 100644
--- a/include/grpc++/impl/codegen/async_stream.h
+++ b/include/grpc++/impl/codegen/async_stream.h
@@ -299,8 +299,16 @@
 };
 
 template <class W, class R>
-class ServerAsyncReader GRPC_FINAL : public ServerAsyncStreamingInterface,
-                                     public AsyncReaderInterface<R> {
+class ServerAsyncReaderInterface : public ServerAsyncStreamingInterface,
+                                   public AsyncReaderInterface<R> {
+ public:
+  virtual void Finish(const W& msg, const Status& status, void* tag) = 0;
+
+  virtual void FinishWithError(const Status& status, void* tag) = 0;
+};
+
+template <class W, class R>
+class ServerAsyncReader GRPC_FINAL : public ServerAsyncReaderInterface<W, R> {
  public:
   explicit ServerAsyncReader(ServerContext* ctx)
       : call_(nullptr, nullptr, nullptr), ctx_(ctx) {}
@@ -321,7 +329,7 @@
     call_.PerformOps(&read_ops_);
   }
 
-  void Finish(const W& msg, const Status& status, void* tag) {
+  void Finish(const W& msg, const Status& status, void* tag) GRPC_OVERRIDE {
     finish_ops_.set_output_tag(tag);
     if (!ctx_->sent_initial_metadata_) {
       finish_ops_.SendInitialMetadata(ctx_->initial_metadata_,
@@ -338,7 +346,7 @@
     call_.PerformOps(&finish_ops_);
   }
 
-  void FinishWithError(const Status& status, void* tag) {
+  void FinishWithError(const Status& status, void* tag) GRPC_OVERRIDE {
     GPR_CODEGEN_ASSERT(!status.ok());
     finish_ops_.set_output_tag(tag);
     if (!ctx_->sent_initial_metadata_) {
@@ -363,8 +371,14 @@
 };
 
 template <class W>
-class ServerAsyncWriter GRPC_FINAL : public ServerAsyncStreamingInterface,
-                                     public AsyncWriterInterface<W> {
+class ServerAsyncWriterInterface : public ServerAsyncStreamingInterface,
+                                   public AsyncWriterInterface<W> {
+ public:
+  virtual void Finish(const Status& status, void* tag) = 0;
+};
+
+template <class W>
+class ServerAsyncWriter GRPC_FINAL : public ServerAsyncWriterInterface<W> {
  public:
   explicit ServerAsyncWriter(ServerContext* ctx)
       : call_(nullptr, nullptr, nullptr), ctx_(ctx) {}
@@ -391,7 +405,7 @@
     call_.PerformOps(&write_ops_);
   }
 
-  void Finish(const Status& status, void* tag) {
+  void Finish(const Status& status, void* tag) GRPC_OVERRIDE {
     finish_ops_.set_output_tag(tag);
     if (!ctx_->sent_initial_metadata_) {
       finish_ops_.SendInitialMetadata(ctx_->initial_metadata_,
@@ -414,9 +428,16 @@
 
 /// Server-side interface for asynchronous bi-directional streaming.
 template <class W, class R>
-class ServerAsyncReaderWriter GRPC_FINAL : public ServerAsyncStreamingInterface,
-                                           public AsyncWriterInterface<W>,
-                                           public AsyncReaderInterface<R> {
+class ServerAsyncReaderWriterInterface : public ServerAsyncStreamingInterface,
+                                         public AsyncWriterInterface<W>,
+                                         public AsyncReaderInterface<R> {
+ public:
+  virtual void Finish(const Status& status, void* tag) = 0;
+};
+
+template <class W, class R>
+class ServerAsyncReaderWriter GRPC_FINAL
+    : public ServerAsyncReaderWriterInterface<W, R> {
  public:
   explicit ServerAsyncReaderWriter(ServerContext* ctx)
       : call_(nullptr, nullptr, nullptr), ctx_(ctx) {}
@@ -449,7 +470,7 @@
     call_.PerformOps(&write_ops_);
   }
 
-  void Finish(const Status& status, void* tag) {
+  void Finish(const Status& status, void* tag) GRPC_OVERRIDE {
     finish_ops_.set_output_tag(tag);
     if (!ctx_->sent_initial_metadata_) {
       finish_ops_.SendInitialMetadata(ctx_->initial_metadata_,
diff --git a/src/cpp/common/core_codegen.h b/include/grpc++/impl/codegen/core_codegen.h
similarity index 100%
rename from src/cpp/common/core_codegen.h
rename to include/grpc++/impl/codegen/core_codegen.h
diff --git a/include/grpc++/impl/codegen/impl/async_stream.h b/include/grpc++/impl/codegen/impl/async_stream.h
index 8f99e7e..7d7a956 100644
--- a/include/grpc++/impl/codegen/impl/async_stream.h
+++ b/include/grpc++/impl/codegen/impl/async_stream.h
@@ -295,8 +295,16 @@
 };
 
 template <class W, class R>
-class ServerAsyncReader GRPC_FINAL : public ServerAsyncStreamingInterface,
-                                     public AsyncReaderInterface<R> {
+class ServerAsyncReaderInterface : public ServerAsyncStreamingInterface,
+                                   public AsyncReaderInterface<R> {
+ public:
+  virtual void Finish(const W& msg, const Status& status, void* tag) = 0;
+
+  virtual void FinishWithError(const Status& status, void* tag) = 0;
+};
+
+template <class W, class R>
+class ServerAsyncReader GRPC_FINAL : public ServerAsyncReaderInterface<W, R> {
  public:
   explicit ServerAsyncReader(ServerContext* ctx)
       : call_(nullptr, nullptr, nullptr), ctx_(ctx) {}
@@ -316,7 +324,7 @@
     call_.PerformOps(&read_ops_);
   }
 
-  void Finish(const W& msg, const Status& status, void* tag) {
+  void Finish(const W& msg, const Status& status, void* tag) GRPC_OVERRIDE {
     finish_ops_.set_output_tag(tag);
     if (!ctx_->sent_initial_metadata_) {
       finish_ops_.SendInitialMetadata(ctx_->initial_metadata_);
@@ -332,7 +340,7 @@
     call_.PerformOps(&finish_ops_);
   }
 
-  void FinishWithError(const Status& status, void* tag) {
+  void FinishWithError(const Status& status, void* tag) GRPC_OVERRIDE {
     GPR_CODEGEN_ASSERT(!status.ok());
     finish_ops_.set_output_tag(tag);
     if (!ctx_->sent_initial_metadata_) {
@@ -356,8 +364,14 @@
 };
 
 template <class W>
-class ServerAsyncWriter GRPC_FINAL : public ServerAsyncStreamingInterface,
-                                     public AsyncWriterInterface<W> {
+class ServerAsyncWriterInterface : public ServerAsyncStreamingInterface,
+                                   public AsyncWriterInterface<W> {
+ public:
+  virtual void Finish(const Status& status, void* tag) = 0;
+};
+
+template <class W>
+class ServerAsyncWriter GRPC_FINAL : public ServerAsyncWriterInterface<W> {
  public:
   explicit ServerAsyncWriter(ServerContext* ctx)
       : call_(nullptr, nullptr, nullptr), ctx_(ctx) {}
@@ -382,7 +396,7 @@
     call_.PerformOps(&write_ops_);
   }
 
-  void Finish(const Status& status, void* tag) {
+  void Finish(const Status& status, void* tag) GRPC_OVERRIDE {
     finish_ops_.set_output_tag(tag);
     if (!ctx_->sent_initial_metadata_) {
       finish_ops_.SendInitialMetadata(ctx_->initial_metadata_);
@@ -404,9 +418,16 @@
 
 /// Server-side interface for asynchronous bi-directional streaming.
 template <class W, class R>
-class ServerAsyncReaderWriter GRPC_FINAL : public ServerAsyncStreamingInterface,
-                                           public AsyncWriterInterface<W>,
-                                           public AsyncReaderInterface<R> {
+class ServerAsyncReaderWriterInterface : public ServerAsyncStreamingInterface,
+                                         public AsyncWriterInterface<W>,
+                                         public AsyncReaderInterface<R> {
+ public:
+  virtual void Finish(const Status& status, void* tag) = 0;
+};
+
+template <class W, class R>
+class ServerAsyncReaderWriter GRPC_FINAL
+    : public ServerAsyncReaderWriterInterface<W, R> {
  public:
   explicit ServerAsyncReaderWriter(ServerContext* ctx)
       : call_(nullptr, nullptr, nullptr), ctx_(ctx) {}
@@ -437,7 +458,7 @@
     call_.PerformOps(&write_ops_);
   }
 
-  void Finish(const Status& status, void* tag) {
+  void Finish(const Status& status, void* tag) GRPC_OVERRIDE {
     finish_ops_.set_output_tag(tag);
     if (!ctx_->sent_initial_metadata_) {
       finish_ops_.SendInitialMetadata(ctx_->initial_metadata_);
diff --git a/include/grpc++/impl/grpc_library.h b/include/grpc++/impl/grpc_library.h
index 175cf99..1184d1b 100644
--- a/include/grpc++/impl/grpc_library.h
+++ b/include/grpc++/impl/grpc_library.h
@@ -37,11 +37,10 @@
 #include <iostream>
 
 #include <grpc++/impl/codegen/config.h>
+#include <grpc++/impl/codegen/core_codegen.h>
 #include <grpc++/impl/codegen/grpc_library.h>
 #include <grpc/grpc.h>
 
-#include "src/cpp/common/core_codegen.h"
-
 namespace grpc {
 
 namespace internal {
diff --git a/setup.py b/setup.py
index f96824f..0e2646d 100644
--- a/setup.py
+++ b/setup.py
@@ -202,7 +202,7 @@
 }
 
 TESTS_REQUIRE = (
-    'oauth2client>=1.4.7',
+    'oauth2client>=2.1.0',
     'protobuf>=3.0.0a3',
     'coverage>=4.0',
 ) + INSTALL_REQUIRES
diff --git a/src/core/lib/channel/http_client_filter.c b/src/core/lib/channel/http_client_filter.c
index 7cb6679..2245a52 100644
--- a/src/core/lib/channel/http_client_filter.c
+++ b/src/core/lib/channel/http_client_filter.c
@@ -39,6 +39,9 @@
 #include "src/core/lib/support/string.h"
 #include "src/core/lib/transport/static_metadata.h"
 
+#define EXPECTED_CONTENT_TYPE "application/grpc"
+#define EXPECTED_CONTENT_TYPE_LENGTH sizeof(EXPECTED_CONTENT_TYPE) - 1
+
 typedef struct call_data {
   grpc_linked_mdelem method;
   grpc_linked_mdelem scheme;
@@ -74,7 +77,24 @@
   } else if (md->key == GRPC_MDSTR_STATUS) {
     grpc_call_element_send_cancel(a->exec_ctx, a->elem);
     return NULL;
+  } else if (md == GRPC_MDELEM_CONTENT_TYPE_APPLICATION_SLASH_GRPC) {
+    return NULL;
   } else if (md->key == GRPC_MDSTR_CONTENT_TYPE) {
+    const char *value_str = grpc_mdstr_as_c_string(md->value);
+    if (strncmp(value_str, EXPECTED_CONTENT_TYPE,
+                EXPECTED_CONTENT_TYPE_LENGTH) == 0 &&
+        (value_str[EXPECTED_CONTENT_TYPE_LENGTH] == '+' ||
+         value_str[EXPECTED_CONTENT_TYPE_LENGTH] == ';')) {
+      /* Although the C implementation doesn't (currently) generate them,
+         any custom +-suffix is explicitly valid. */
+      /* TODO(klempner): We should consider preallocating common values such
+         as +proto or +json, or at least stashing them if we see them. */
+      /* TODO(klempner): Should we be surfacing this to application code? */
+    } else {
+      /* TODO(klempner): We're currently allowing this, but we shouldn't
+         see it without a proxy so log for now. */
+      gpr_log(GPR_INFO, "Unexpected content-type '%s'", value_str);
+    }
     return NULL;
   }
   return md;
diff --git a/src/core/lib/channel/http_server_filter.c b/src/core/lib/channel/http_server_filter.c
index aa8e377..922f771 100644
--- a/src/core/lib/channel/http_server_filter.c
+++ b/src/core/lib/channel/http_server_filter.c
@@ -108,7 +108,7 @@
     } else {
       /* TODO(klempner): We're currently allowing this, but we shouldn't
          see it without a proxy so log for now. */
-      gpr_log(GPR_INFO, "Unexpected content-type %s", value_str);
+      gpr_log(GPR_INFO, "Unexpected content-type '%s'", value_str);
     }
     return NULL;
   } else if (md->key == GRPC_MDSTR_TE || md->key == GRPC_MDSTR_METHOD ||
diff --git a/src/core/lib/iomgr/timer.c b/src/core/lib/iomgr/timer.c
index 05a2fc1..69d3bab 100644
--- a/src/core/lib/iomgr/timer.c
+++ b/src/core/lib/iomgr/timer.c
@@ -278,9 +278,8 @@
   return !grpc_timer_heap_is_empty(&shard->heap);
 }
 
-/* This pollent the next non-cancelled timer with deadline <= now from the
-   queue,
-   or returns NULL if there isn't one.
+/* This pops the next non-cancelled timer with deadline <= now from the
+   queue, or returns NULL if there isn't one.
    REQUIRES: shard->mu locked */
 static grpc_timer *pop_one(shard_type *shard, gpr_timespec now) {
   grpc_timer *timer;
diff --git a/src/core/lib/transport/metadata.c b/src/core/lib/transport/metadata.c
index 82c8e23..79de54b 100644
--- a/src/core/lib/transport/metadata.c
+++ b/src/core/lib/transport/metadata.c
@@ -129,7 +129,10 @@
   internal_metadata **elems;
   size_t count;
   size_t capacity;
-  size_t free;
+  /** Estimate of the number of unreferenced mdelems in the hash table.
+      This will eventually converge to the exact number, but it's instantaneous
+      accuracy is not guaranteed */
+  gpr_atm free_estimate;
 } mdtab_shard;
 
 #define LOG2_STRTAB_SHARD_COUNT 5
@@ -217,7 +220,7 @@
     mdtab_shard *shard = &g_mdtab_shard[i];
     gpr_mu_init(&shard->mu);
     shard->count = 0;
-    shard->free = 0;
+    gpr_atm_no_barrier_store(&shard->free_estimate, 0);
     shard->capacity = INITIAL_MDTAB_CAPACITY;
     shard->elems = gpr_malloc(sizeof(*shard->elems) * shard->capacity);
     memset(shard->elems, 0, sizeof(*shard->elems) * shard->capacity);
@@ -281,10 +284,8 @@
           grpc_mdstr_as_c_string((grpc_mdstr *)md->key),
           grpc_mdstr_as_c_string((grpc_mdstr *)md->value));
 #endif
-  if (0 == gpr_atm_no_barrier_fetch_add(&md->refcnt, 2)) {
-    shard->free--;
-  } else {
-    GPR_ASSERT(1 != gpr_atm_no_barrier_fetch_add(&md->refcnt, -1));
+  if (0 == gpr_atm_no_barrier_fetch_add(&md->refcnt, 1)) {
+    gpr_atm_no_barrier_fetch_add(&shard->free_estimate, -1);
   }
 }
 
@@ -447,6 +448,7 @@
   size_t i;
   internal_metadata **prev_next;
   internal_metadata *md, *next;
+  gpr_atm num_freed = 0;
 
   GPR_TIMER_BEGIN("gc_mdtab", 0);
   for (i = 0; i < shard->capacity; i++) {
@@ -463,13 +465,14 @@
         }
         gpr_free(md);
         *prev_next = next;
-        shard->free--;
+        num_freed++;
         shard->count--;
       } else {
         prev_next = &md->bucket_next;
       }
     }
   }
+  gpr_atm_no_barrier_fetch_add(&shard->free_estimate, -num_freed);
   GPR_TIMER_END("gc_mdtab", 0);
 }
 
@@ -504,7 +507,8 @@
 }
 
 static void rehash_mdtab(mdtab_shard *shard) {
-  if (shard->free > shard->capacity / 4) {
+  if (gpr_atm_no_barrier_load(&shard->free_estimate) >
+      (gpr_atm)(shard->capacity / 4)) {
     gc_mdtab(shard);
   } else {
     grow_mdtab(shard);
@@ -553,7 +557,7 @@
 
   /* not found: create a new pair */
   md = gpr_malloc(sizeof(internal_metadata));
-  gpr_atm_rel_store(&md->refcnt, 2);
+  gpr_atm_rel_store(&md->refcnt, 1);
   md->key = key;
   md->value = value;
   md->user_data = 0;
@@ -645,7 +649,7 @@
      this function - meaning that no adjustment to mdtab_free is necessary,
      simplifying the logic here to be just an atomic increment */
   /* use C assert to have this removed in opt builds */
-  assert(gpr_atm_no_barrier_load(&md->refcnt) >= 2);
+  assert(gpr_atm_no_barrier_load(&md->refcnt) >= 1);
   gpr_atm_no_barrier_fetch_add(&md->refcnt, 1);
   return gmd;
 }
@@ -662,18 +666,13 @@
           grpc_mdstr_as_c_string((grpc_mdstr *)md->key),
           grpc_mdstr_as_c_string((grpc_mdstr *)md->value));
 #endif
-  if (2 == gpr_atm_full_fetch_add(&md->refcnt, -1)) {
-    uint32_t hash = GRPC_MDSTR_KV_HASH(md->key->hash, md->value->hash);
+  uint32_t hash = GRPC_MDSTR_KV_HASH(md->key->hash, md->value->hash);
+  if (1 == gpr_atm_full_fetch_add(&md->refcnt, -1)) {
+    /* once the refcount hits zero, some other thread can come along and
+       free md at any time: it's unsafe from this point on to access it */
     mdtab_shard *shard =
         &g_mdtab_shard[SHARD_IDX(hash, LOG2_MDTAB_SHARD_COUNT)];
-    GPR_TIMER_BEGIN("grpc_mdelem_unref.to_zero", 0);
-    gpr_mu_lock(&shard->mu);
-    if (1 == gpr_atm_no_barrier_load(&md->refcnt)) {
-      shard->free++;
-      gpr_atm_no_barrier_store(&md->refcnt, 0);
-    }
-    gpr_mu_unlock(&shard->mu);
-    GPR_TIMER_END("grpc_mdelem_unref.to_zero", 0);
+    gpr_atm_no_barrier_fetch_add(&shard->free_estimate, 1);
   }
 }
 
diff --git a/src/cpp/common/core_codegen.cc b/src/cpp/common/core_codegen.cc
index 8e8d42e..cc35aa6 100644
--- a/src/cpp/common/core_codegen.cc
+++ b/src/cpp/common/core_codegen.cc
@@ -31,7 +31,7 @@
  *
  */
 
-#include "src/cpp/common/core_codegen.h"
+#include <grpc++/impl/codegen/core_codegen.h>
 
 #include <stdlib.h>
 
diff --git a/src/csharp/Grpc.Core/Metadata.cs b/src/csharp/Grpc.Core/Metadata.cs
index e982fa0..f73f720 100644
--- a/src/csharp/Grpc.Core/Metadata.cs
+++ b/src/csharp/Grpc.Core/Metadata.cs
@@ -95,6 +95,7 @@
 
         public void Insert(int index, Metadata.Entry item)
         {
+            GrpcPreconditions.CheckNotNull(item);
             CheckWriteable();
             entries.Insert(index, item);
         }
@@ -114,6 +115,7 @@
 
             set
             {
+                GrpcPreconditions.CheckNotNull(value);
                 CheckWriteable();
                 entries[index] = value;
             }
@@ -121,6 +123,7 @@
 
         public void Add(Metadata.Entry item)
         {
+            GrpcPreconditions.CheckNotNull(item);
             CheckWriteable();
             entries.Add(item);
         }
@@ -187,7 +190,7 @@
         /// <summary>
         /// Metadata entry
         /// </summary>
-        public struct Entry
+        public class Entry
         {
             private static readonly Encoding Encoding = Encoding.ASCII;
             private static readonly Regex ValidKeyRegex = new Regex("^[a-z0-9_-]+$");
diff --git a/src/proto/grpc/testing/messages.proto b/src/proto/grpc/testing/messages.proto
index a063b47..e109015 100644
--- a/src/proto/grpc/testing/messages.proto
+++ b/src/proto/grpc/testing/messages.proto
@@ -41,17 +41,6 @@
 
   // Uncompressable binary format.
   UNCOMPRESSABLE = 1;
-
-  // Randomly chosen from all other formats defined in this enum.
-  RANDOM = 2;
-}
-
-// Compression algorithms
-enum CompressionType {
-  // No compression
-  NONE = 0;
-  GZIP = 1;
-  DEFLATE = 2;
 }
 
 // A block of data, to simply increase gRPC message size.
@@ -88,8 +77,8 @@
   // Whether SimpleResponse should include OAuth scope.
   bool fill_oauth_scope = 5;
 
-  // Compression algorithm to be used by the server for the response (stream)
-  CompressionType response_compression = 6;
+  // Whether to request the server to compress the response.
+  bool request_compressed_response = 6;
 
   // Whether server should return a given status
   EchoStatus response_status = 7;
@@ -145,8 +134,8 @@
   // Optional input payload sent along with the request.
   Payload payload = 3;
 
-  // Compression algorithm to be used by the server for the response (stream)
-  CompressionType response_compression = 6;
+  // Whether to request the server to compress the response.
+  bool request_compressed_response = 6;
 
   // Whether server should return a given status
   EchoStatus response_status = 7;
diff --git a/src/python/grpcio/grpc/_auth.py b/src/python/grpcio/grpc/_auth.py
index 3ae00ca..dea3221 100644
--- a/src/python/grpcio/grpc/_auth.py
+++ b/src/python/grpcio/grpc/_auth.py
@@ -29,6 +29,7 @@
 
 """GRPCAuthMetadataPlugins for standard authentication."""
 
+import inspect
 from concurrent import futures
 
 import grpc
@@ -46,9 +47,21 @@
     self._credentials = credentials
     self._pool = futures.ThreadPoolExecutor(max_workers=1)
 
+    # Hack to determine if these are JWT creds and we need to pass
+    # additional_claims when getting a token
+    if 'additional_claims' in inspect.getargspec(
+        credentials.get_access_token).args:
+      self._is_jwt = True
+    else:
+      self._is_jwt = False
+
   def __call__(self, context, callback):
     # MetadataPlugins cannot block (see grpc.beta.interfaces.py)
-    future = self._pool.submit(self._credentials.get_access_token)
+    if self._is_jwt:
+      future = self._pool.submit(self._credentials.get_access_token,
+                                 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):
diff --git a/src/python/grpcio/tests/interop/client.py b/src/python/grpcio/tests/interop/client.py
index e3d5545..8aa1ce3 100644
--- a/src/python/grpcio/tests/interop/client.py
+++ b/src/python/grpcio/tests/interop/client.py
@@ -76,6 +76,9 @@
     creds = oauth2client_client.GoogleCredentials.get_application_default()
     scoped_creds = creds.create_scoped([args.oauth_scope])
     call_creds = implementations.google_call_credentials(scoped_creds)
+  elif args.test_case == 'jwt_token_creds':
+    creds = oauth2client_client.GoogleCredentials.get_application_default()
+    call_creds = implementations.google_call_credentials(creds)
   else:
     call_creds = None
   if args.use_tls:
diff --git a/src/python/grpcio/tests/interop/methods.py b/src/python/grpcio/tests/interop/methods.py
index d5ef0c6..7eac511 100644
--- a/src/python/grpcio/tests/interop/methods.py
+++ b/src/python/grpcio/tests/interop/methods.py
@@ -310,6 +310,16 @@
         (response.oauth_scope, args.oauth_scope))
 
 
+def _jwt_token_creds(stub, args):
+  json_key_filename = os.environ[
+      oauth2client_client.GOOGLE_APPLICATION_CREDENTIALS]
+  wanted_email = json.load(open(json_key_filename, 'rb'))['client_email']
+  response = _large_unary_common_behavior(stub, True, False)
+  if wanted_email != response.username:
+    raise ValueError(
+        'expected username %s, got %s' % (wanted_email, response.username))
+
+
 def _per_rpc_creds(stub, args):
   json_key_filename = os.environ[
       oauth2client_client.GOOGLE_APPLICATION_CREDENTIALS]
@@ -338,6 +348,7 @@
   EMPTY_STREAM = 'empty_stream'
   COMPUTE_ENGINE_CREDS = 'compute_engine_creds'
   OAUTH2_AUTH_TOKEN = 'oauth2_auth_token'
+  JWT_TOKEN_CREDS = 'jwt_token_creds'
   PER_RPC_CREDS = 'per_rpc_creds'
   TIMEOUT_ON_SLEEPING_SERVER = 'timeout_on_sleeping_server'
 
@@ -364,6 +375,8 @@
       _compute_engine_creds(stub, args)
     elif self is TestCase.OAUTH2_AUTH_TOKEN:
       _oauth2_auth_token(stub, args)
+    elif self is TestCase.JWT_TOKEN_CREDS:
+      _jwt_token_creds(stub, args)
     elif self is TestCase.PER_RPC_CREDS:
       _per_rpc_creds(stub, args)
     else:
diff --git a/src/python/grpcio/tests/qps/benchmark_client.py b/src/python/grpcio/tests/qps/benchmark_client.py
index b372ea0..e292234 100644
--- a/src/python/grpcio/tests/qps/benchmark_client.py
+++ b/src/python/grpcio/tests/qps/benchmark_client.py
@@ -82,6 +82,7 @@
     self._response_callbacks = []
 
   def add_response_callback(self, callback):
+    """callback will be invoked as callback(client, query_time)"""
     self._response_callbacks.append(callback)
 
   @abc.abstractmethod
@@ -95,10 +96,10 @@
   def stop(self):
     pass
 
-  def _handle_response(self, query_time):
+  def _handle_response(self, client, query_time):
     self._hist.add(query_time * 1e9)  # Report times in nanoseconds
     for callback in self._response_callbacks:
-      callback(query_time)
+      callback(client, query_time)
 
 
 class UnarySyncBenchmarkClient(BenchmarkClient):
@@ -121,7 +122,7 @@
     start_time = time.time()
     self._stub.UnaryCall(self._request, _TIMEOUT)
     end_time = time.time()
-    self._handle_response(end_time - start_time)
+    self._handle_response(self, end_time - start_time)
 
 
 class UnaryAsyncBenchmarkClient(BenchmarkClient):
@@ -136,19 +137,20 @@
   def _response_received(self, start_time, resp):
     resp.result()
     end_time = time.time()
-    self._handle_response(end_time - start_time)
+    self._handle_response(self, end_time - start_time)
 
   def stop(self):
     self._stub = None
 
 
-class StreamingSyncBenchmarkClient(BenchmarkClient):
+class _SyncStream(object):
 
-  def __init__(self, server, config, hist):
-    super(StreamingSyncBenchmarkClient, self).__init__(server, config, hist)
+  def __init__(self, stub, generic, request, handle_response):
+    self._stub = stub
+    self._generic = generic
+    self._request = request
+    self._handle_response = handle_response
     self._is_streaming = False
-    self._pool = futures.ThreadPoolExecutor(max_workers=1)
-    # Use a thread-safe queue to put requests on the stream
     self._request_queue = queue.Queue()
     self._send_time_queue = queue.Queue()
 
@@ -158,15 +160,6 @@
 
   def start(self):
     self._is_streaming = True
-    self._pool.submit(self._request_stream)
-
-  def stop(self):
-    self._is_streaming = False
-    self._pool.shutdown(wait=True)
-    self._stub = None
-
-  def _request_stream(self):
-    self._is_streaming = True
     if self._generic:
       stream_callable = self._stub.stream_stream(
           'grpc.testing.BenchmarkService', 'StreamingCall')
@@ -175,8 +168,11 @@
 
     response_stream = stream_callable(self._request_generator(), _TIMEOUT)
     for _ in response_stream:
-      end_time = time.time()
-      self._handle_response(end_time - self._send_time_queue.get_nowait())
+      self._handle_response(
+          self, time.time() - self._send_time_queue.get_nowait())
+
+  def stop(self):
+    self._is_streaming = False
 
   def _request_generator(self):
     while self._is_streaming:
@@ -187,46 +183,28 @@
         pass
 
 
-class AsyncReceiver(face.ResponseReceiver):
-  """Receiver for async stream responses."""
-
-  def __init__(self, send_time_queue, response_handler):
-    self._send_time_queue = send_time_queue
-    self._response_handler = response_handler
-
-  def initial_metadata(self, initial_mdetadata):
-    pass
-
-  def response(self, response):
-    end_time = time.time()
-    self._response_handler(end_time - self._send_time_queue.get_nowait())
-
-  def complete(self, terminal_metadata, code, details):
-    pass
-
-
-class StreamingAsyncBenchmarkClient(BenchmarkClient):
+class StreamingSyncBenchmarkClient(BenchmarkClient):
 
   def __init__(self, server, config, hist):
-    super(StreamingAsyncBenchmarkClient, self).__init__(server, config, hist)
-    self._send_time_queue = queue.Queue()
-    self._receiver = AsyncReceiver(self._send_time_queue, self._handle_response)
-    self._rendezvous = None
+    super(StreamingSyncBenchmarkClient, self).__init__(server, config, hist)
+    self._pool = futures.ThreadPoolExecutor(
+        max_workers=config.outstanding_rpcs_per_channel)
+    self._streams = [_SyncStream(self._stub, self._generic, 
+                                 self._request, self._handle_response)
+                     for _ in xrange(config.outstanding_rpcs_per_channel)]
+    self._curr_stream = 0
 
   def send_request(self):
-    if self._rendezvous is not None:
-      self._send_time_queue.put(time.time())
-      self._rendezvous.consume(self._request)
+    # Use a round_robin scheduler to determine what stream to send on
+    self._streams[self._curr_stream].send_request()
+    self._curr_stream = (self._curr_stream + 1) % len(self._streams)
 
   def start(self):
-    if self._generic:
-      stream_callable = self._stub.stream_stream(
-          'grpc.testing.BenchmarkService', 'StreamingCall')
-    else:
-      stream_callable = self._stub.StreamingCall
-    self._rendezvous = stream_callable.event(
-        self._receiver, lambda *args: None, _TIMEOUT)
+    for stream in self._streams:
+      self._pool.submit(stream.start)
 
   def stop(self):
-    self._rendezvous.terminate()
-    self._rendezvous = None
+    for stream in self._streams:
+      stream.stop()
+    self._pool.shutdown(wait=True)
+    self._stub = None
diff --git a/src/python/grpcio/tests/qps/client_runner.py b/src/python/grpcio/tests/qps/client_runner.py
index 1ede7d2..2d1d981 100644
--- a/src/python/grpcio/tests/qps/client_runner.py
+++ b/src/python/grpcio/tests/qps/client_runner.py
@@ -98,7 +98,6 @@
     self._client.stop()
     self._client = None
 
-  def _send_request(self, response_time):
+  def _send_request(self, client, response_time):
     if self._is_running:
-      self._client.send_request()
-
+      client.send_request()
diff --git a/src/python/grpcio/tests/qps/qps_worker.py b/src/python/grpcio/tests/qps/qps_worker.py
index 3dda718..1692637 100644
--- a/src/python/grpcio/tests/qps/qps_worker.py
+++ b/src/python/grpcio/tests/qps/qps_worker.py
@@ -43,9 +43,7 @@
   server.add_insecure_port('[::]:{}'.format(port))
   server.start()
   servicer.wait_for_quit()
-  # Drain outstanding requests for clean exit
-  time.sleep(2)
-  server.stop(0)
+  server.stop(2)
 
 
 if __name__ == '__main__':
diff --git a/src/python/grpcio/tests/qps/worker_server.py b/src/python/grpcio/tests/qps/worker_server.py
index 1f9af54..d41f837 100644
--- a/src/python/grpcio/tests/qps/worker_server.py
+++ b/src/python/grpcio/tests/qps/worker_server.py
@@ -153,9 +153,8 @@
       if config.rpc_type == control_pb2.UNARY:
         client = benchmark_client.UnaryAsyncBenchmarkClient(
             server, config, qps_data)
-      elif config.rpc_type == control_pb2.STREAMING:
-        client = benchmark_client.StreamingAsyncBenchmarkClient(
-            server, config, qps_data)
+      else:
+        raise Exception('Async streaming client not supported')
     else:
       raise Exception('Unsupported client type {}'.format(config.client_type))
 
diff --git a/test/cpp/interop/interop_client.cc b/test/cpp/interop/interop_client.cc
index 189e4a8..a0479e8 100644
--- a/test/cpp/interop/interop_client.cc
+++ b/test/cpp/interop/interop_client.cc
@@ -55,8 +55,6 @@
 namespace grpc {
 namespace testing {
 
-static const char* kRandomFile = "test/cpp/interop/rnd.dat";
-
 namespace {
 // The same value is defined by the Java client.
 const std::vector<int> request_stream_sizes = {27182, 8, 1828, 45904};
@@ -67,30 +65,26 @@
 const int kLargeRequestSize = 271828;
 const int kLargeResponseSize = 314159;
 
-CompressionType GetInteropCompressionTypeFromCompressionAlgorithm(
-    grpc_compression_algorithm algorithm) {
-  switch (algorithm) {
-    case GRPC_COMPRESS_NONE:
-      return CompressionType::NONE;
-    case GRPC_COMPRESS_GZIP:
-      return CompressionType::GZIP;
-    case GRPC_COMPRESS_DEFLATE:
-      return CompressionType::DEFLATE;
-    default:
-      GPR_ASSERT(false);
-  }
-}
-
 void NoopChecks(const InteropClientContextInspector& inspector,
                 const SimpleRequest* request, const SimpleResponse* response) {}
 
 void CompressionChecks(const InteropClientContextInspector& inspector,
                        const SimpleRequest* request,
                        const SimpleResponse* response) {
-  GPR_ASSERT(request->response_compression() ==
-             GetInteropCompressionTypeFromCompressionAlgorithm(
-                 inspector.GetCallCompressionAlgorithm()));
-  if (request->response_compression() == NONE) {
+  const grpc_compression_algorithm received_compression =
+      inspector.GetCallCompressionAlgorithm();
+  if (request->request_compressed_response() &&
+      received_compression == GRPC_COMPRESS_NONE) {
+    if (request->request_compressed_response() &&
+        received_compression == GRPC_COMPRESS_NONE) {
+      // Requested some compression, got NONE. This is an error.
+      gpr_log(GPR_ERROR,
+              "Failure: Requested compression but got uncompressed response "
+              "from server.");
+      abort();
+    }
+  }
+  if (!request->request_compressed_response()) {
     GPR_ASSERT(!(inspector.GetMessageFlags() & GRPC_WRITE_INTERNAL_COMPRESS));
   } else if (request->response_type() == PayloadType::COMPRESSABLE) {
     // requested compression and compressable response => results should always
@@ -211,20 +205,22 @@
   custom_checks_fn(inspector, request, response);
 
   // Payload related checks.
-  if (request->response_type() != PayloadType::RANDOM) {
-    GPR_ASSERT(response->payload().type() == request->response_type());
-  }
+  GPR_ASSERT(response->payload().type() == request->response_type());
   switch (response->payload().type()) {
     case PayloadType::COMPRESSABLE:
       GPR_ASSERT(response->payload().body() ==
                  grpc::string(kLargeResponseSize, '\0'));
       break;
     case PayloadType::UNCOMPRESSABLE: {
-      std::ifstream rnd_file(kRandomFile);
-      GPR_ASSERT(rnd_file.good());
-      for (int i = 0; i < kLargeResponseSize; i++) {
-        GPR_ASSERT(response->payload().body()[i] == (char)rnd_file.get());
-      }
+      // We don't really check anything: We can't assert that the payload is
+      // uncompressed because it's the server's prerogative to decide on that,
+      // and different implementations decide differently (ie, Java always
+      // compresses when requested to do so, whereas C core throws away the
+      // compressed payload if the output is larger than the input).
+      // In addition, we don't compare the actual random bytes received because
+      // asserting that data is sent/received properly isn't the purpose of this
+      // test. Moreover, different implementations are also free to use
+      // different sets of random bytes.
     } break;
     default:
       GPR_ASSERT(false);
@@ -341,13 +337,13 @@
 }
 
 bool InteropClient::DoLargeCompressedUnary() {
-  const CompressionType compression_types[] = {NONE, GZIP, DEFLATE};
-  const PayloadType payload_types[] = {COMPRESSABLE, UNCOMPRESSABLE, RANDOM};
+  const bool request_compression[] = {false, true};
+  const PayloadType payload_types[] = {COMPRESSABLE, UNCOMPRESSABLE};
   for (size_t i = 0; i < GPR_ARRAY_SIZE(payload_types); i++) {
-    for (size_t j = 0; j < GPR_ARRAY_SIZE(compression_types); j++) {
+    for (size_t j = 0; j < GPR_ARRAY_SIZE(request_compression); j++) {
       char* log_suffix;
       gpr_asprintf(&log_suffix, "(compression=%s; payload=%s)",
-                   CompressionType_Name(compression_types[j]).c_str(),
+                   request_compression[j] ? "true" : "false",
                    PayloadType_Name(payload_types[i]).c_str());
 
       gpr_log(GPR_DEBUG, "Sending a large compressed unary rpc %s.",
@@ -355,7 +351,7 @@
       SimpleRequest request;
       SimpleResponse response;
       request.set_response_type(payload_types[i]);
-      request.set_response_compression(compression_types[j]);
+      request.set_request_compressed_response(request_compression[j]);
 
       if (!PerformLargeUnary(&request, &response, CompressionChecks)) {
         gpr_log(GPR_ERROR, "Large compressed unary failed %s", log_suffix);
@@ -452,23 +448,23 @@
 }
 
 bool InteropClient::DoResponseCompressedStreaming() {
-  const CompressionType compression_types[] = {NONE, GZIP, DEFLATE};
-  const PayloadType payload_types[] = {COMPRESSABLE, UNCOMPRESSABLE, RANDOM};
+  const bool request_compression[] = {false, true};
+  const PayloadType payload_types[] = {COMPRESSABLE, UNCOMPRESSABLE};
   for (size_t i = 0; i < GPR_ARRAY_SIZE(payload_types); i++) {
-    for (size_t j = 0; j < GPR_ARRAY_SIZE(compression_types); j++) {
+    for (size_t j = 0; j < GPR_ARRAY_SIZE(request_compression); j++) {
       ClientContext context;
       InteropClientContextInspector inspector(context);
       StreamingOutputCallRequest request;
 
       char* log_suffix;
       gpr_asprintf(&log_suffix, "(compression=%s; payload=%s)",
-                   CompressionType_Name(compression_types[j]).c_str(),
+                   request_compression[j] ? "true" : "false",
                    PayloadType_Name(payload_types[i]).c_str());
 
       gpr_log(GPR_DEBUG, "Receiving response streaming rpc %s.", log_suffix);
 
       request.set_response_type(payload_types[i]);
-      request.set_response_compression(compression_types[j]);
+      request.set_request_compressed_response(request_compression[j]);
 
       for (size_t k = 0; k < response_stream_sizes.size(); ++k) {
         ResponseParameters* response_parameter =
@@ -483,37 +479,32 @@
       size_t k = 0;
       while (stream->Read(&response)) {
         // Payload related checks.
-        if (request.response_type() != PayloadType::RANDOM) {
-          GPR_ASSERT(response.payload().type() == request.response_type());
-        }
+        GPR_ASSERT(response.payload().type() == request.response_type());
         switch (response.payload().type()) {
           case PayloadType::COMPRESSABLE:
             GPR_ASSERT(response.payload().body() ==
                        grpc::string(response_stream_sizes[k], '\0'));
             break;
-          case PayloadType::UNCOMPRESSABLE: {
-            std::ifstream rnd_file(kRandomFile);
-            GPR_ASSERT(rnd_file.good());
-            for (int n = 0; n < response_stream_sizes[k]; n++) {
-              GPR_ASSERT(response.payload().body()[n] == (char)rnd_file.get());
-            }
-          } break;
+          case PayloadType::UNCOMPRESSABLE:
+            break;
           default:
             GPR_ASSERT(false);
         }
 
         // Compression related checks.
-        GPR_ASSERT(request.response_compression() ==
-                   GetInteropCompressionTypeFromCompressionAlgorithm(
-                       inspector.GetCallCompressionAlgorithm()));
-        if (request.response_compression() == NONE) {
+        if (request.request_compressed_response()) {
+          GPR_ASSERT(inspector.GetCallCompressionAlgorithm() >
+                     GRPC_COMPRESS_NONE);
+          if (request.response_type() == PayloadType::COMPRESSABLE) {
+            // requested compression and compressable response => results should
+            // always be compressed.
+            GPR_ASSERT(inspector.GetMessageFlags() &
+                       GRPC_WRITE_INTERNAL_COMPRESS);
+          }
+        } else {
+          // requested *no* compression.
           GPR_ASSERT(
               !(inspector.GetMessageFlags() & GRPC_WRITE_INTERNAL_COMPRESS));
-        } else if (request.response_type() == PayloadType::COMPRESSABLE) {
-          // requested compression and compressable response => results should
-          // always be compressed.
-          GPR_ASSERT(inspector.GetMessageFlags() &
-                     GRPC_WRITE_INTERNAL_COMPRESS);
         }
 
         ++k;
diff --git a/test/cpp/interop/server_main.cc b/test/cpp/interop/server_main.cc
index 889874f..bbedda1 100644
--- a/test/cpp/interop/server_main.cc
+++ b/test/cpp/interop/server_main.cc
@@ -110,14 +110,7 @@
   }
 }
 
-bool SetPayload(PayloadType type, int size, Payload* payload) {
-  PayloadType response_type;
-  if (type == PayloadType::RANDOM) {
-    response_type =
-        rand() & 0x1 ? PayloadType::COMPRESSABLE : PayloadType::UNCOMPRESSABLE;
-  } else {
-    response_type = type;
-  }
+bool SetPayload(PayloadType response_type, int size, Payload* payload) {
   payload->set_type(response_type);
   switch (response_type) {
     case PayloadType::COMPRESSABLE: {
@@ -141,18 +134,9 @@
 template <typename RequestType>
 void SetResponseCompression(ServerContext* context,
                             const RequestType& request) {
-  switch (request.response_compression()) {
-    case grpc::testing::NONE:
-      context->set_compression_algorithm(GRPC_COMPRESS_NONE);
-      break;
-    case grpc::testing::GZIP:
-      context->set_compression_algorithm(GRPC_COMPRESS_GZIP);
-      break;
-    case grpc::testing::DEFLATE:
-      context->set_compression_algorithm(GRPC_COMPRESS_DEFLATE);
-      break;
-    default:
-      abort();
+  if (request.request_compressed_response()) {
+    // Any level would do, let's go for HIGH because we are overachievers.
+    context->set_compression_level(GRPC_COMPRESS_LEVEL_HIGH);
   }
 }
 
diff --git a/tools/doxygen/Doxyfile.c++ b/tools/doxygen/Doxyfile.c++
index 0017792..6a80556 100644
--- a/tools/doxygen/Doxyfile.c++
+++ b/tools/doxygen/Doxyfile.c++
@@ -770,6 +770,7 @@
 include/grpc++/grpc++.h \
 include/grpc++/impl/call.h \
 include/grpc++/impl/client_unary_call.h \
+include/grpc++/impl/codegen/core_codegen.h \
 include/grpc++/impl/grpc_library.h \
 include/grpc++/impl/method_handler_impl.h \
 include/grpc++/impl/rpc_method.h \
diff --git a/tools/doxygen/Doxyfile.c++.internal b/tools/doxygen/Doxyfile.c++.internal
index 1c6884c..746391e 100644
--- a/tools/doxygen/Doxyfile.c++.internal
+++ b/tools/doxygen/Doxyfile.c++.internal
@@ -770,6 +770,7 @@
 include/grpc++/grpc++.h \
 include/grpc++/impl/call.h \
 include/grpc++/impl/client_unary_call.h \
+include/grpc++/impl/codegen/core_codegen.h \
 include/grpc++/impl/grpc_library.h \
 include/grpc++/impl/method_handler_impl.h \
 include/grpc++/impl/rpc_method.h \
@@ -855,8 +856,8 @@
 include/grpc/impl/codegen/sync_posix.h \
 include/grpc/impl/codegen/sync_windows.h \
 include/grpc/impl/codegen/time.h \
+include/grpc++/impl/codegen/core_codegen.h \
 src/cpp/client/secure_credentials.h \
-src/cpp/common/core_codegen.h \
 src/cpp/common/secure_auth_context.h \
 src/cpp/server/secure_server_credentials.h \
 src/cpp/client/create_channel_internal.h \
diff --git a/tools/doxygen/Doxyfile.c++.internal.orig b/tools/doxygen/Doxyfile.c++.internal.orig
new file mode 100644
index 0000000..c214b3d
--- /dev/null
+++ b/tools/doxygen/Doxyfile.c++.internal.orig
@@ -0,0 +1,2505 @@
+
+
+# Doxyfile 1.8.9.1
+
+# This file describes the settings to be used by the documentation system
+# doxygen (www.doxygen.org) for a project.
+#
+# All text after a double hash (##) is considered a comment and is placed in
+# front of the TAG it is preceding.
+#
+# All text after a single hash (#) is considered a comment and will be ignored.
+# The format is:
+# TAG = value [value, ...]
+# For lists, items can also be appended using:
+# TAG += value [value, ...]
+# Values that contain spaces should be placed between quotes (\" \").
+
+#---------------------------------------------------------------------------
+# Project related configuration options
+#---------------------------------------------------------------------------
+
+# This tag specifies the encoding used for all characters in the config file
+# that follow. The default is UTF-8 which is also the encoding used for all text
+# before the first occurrence of this tag. Doxygen uses libiconv (or the iconv
+# built into libc) for the transcoding. See http://www.gnu.org/software/libiconv
+# for the list of possible encodings.
+# The default value is: UTF-8.
+
+DOXYFILE_ENCODING      = UTF-8
+
+# The PROJECT_NAME tag is a single word (or a sequence of words surrounded by
+# double-quotes, unless you are using Doxywizard) that should identify the
+# project for which the documentation is generated. This name is used in the
+# title of most generated pages and in a few other places.
+# The default value is: My Project.
+
+PROJECT_NAME           = "GRPC C++"
+
+# The PROJECT_NUMBER tag can be used to enter a project or revision number. This
+# could be handy for archiving the generated documentation or if some version
+# control system is used.
+
+PROJECT_NUMBER         = 0.15.0-dev
+
+# Using the PROJECT_BRIEF tag one can provide an optional one line description
+# for a project that appears at the top of each page and should give viewer a
+# quick idea about the purpose of the project. Keep the description short.
+
+PROJECT_BRIEF          =
+
+# With the PROJECT_LOGO tag one can specify a logo or an icon that is included
+# in the documentation. The maximum height of the logo should not exceed 55
+# pixels and the maximum width should not exceed 200 pixels. Doxygen will copy
+# the logo to the output directory.
+
+PROJECT_LOGO           =
+
+# The OUTPUT_DIRECTORY tag is used to specify the (relative or absolute) path
+# into which the generated documentation will be written. If a relative path is
+# entered, it will be relative to the location where doxygen was started. If
+# left blank the current directory will be used.
+
+OUTPUT_DIRECTORY       = doc/ref/c++.internal
+
+# If the CREATE_SUBDIRS tag is set to YES then doxygen will create 4096 sub-
+# directories (in 2 levels) under the output directory of each output format and
+# will distribute the generated files over these directories. Enabling this
+# option can be useful when feeding doxygen a huge amount of source files, where
+# putting all generated files in the same directory would otherwise causes
+# performance problems for the file system.
+# The default value is: NO.
+
+CREATE_SUBDIRS         = NO
+
+# If the ALLOW_UNICODE_NAMES tag is set to YES, doxygen will allow non-ASCII
+# characters to appear in the names of generated files. If set to NO, non-ASCII
+# characters will be escaped, for example _xE3_x81_x84 will be used for Unicode
+# U+3044.
+# The default value is: NO.
+
+ALLOW_UNICODE_NAMES    = NO
+
+# The OUTPUT_LANGUAGE tag is used to specify the language in which all
+# documentation generated by doxygen is written. Doxygen will use this
+# information to generate all constant output in the proper language.
+# Possible values are: Afrikaans, Arabic, Armenian, Brazilian, Catalan, Chinese,
+# Chinese-Traditional, Croatian, Czech, Danish, Dutch, English (United States),
+# Esperanto, Farsi (Persian), Finnish, French, German, Greek, Hungarian,
+# Indonesian, Italian, Japanese, Japanese-en (Japanese with English messages),
+# Korean, Korean-en (Korean with English messages), Latvian, Lithuanian,
+# Macedonian, Norwegian, Persian (Farsi), Polish, Portuguese, Romanian, Russian,
+# Serbian, Serbian-Cyrillic, Slovak, Slovene, Spanish, Swedish, Turkish,
+# Ukrainian and Vietnamese.
+# The default value is: English.
+
+OUTPUT_LANGUAGE        = English
+
+# If the BRIEF_MEMBER_DESC tag is set to YES, doxygen will include brief member
+# descriptions after the members that are listed in the file and class
+# documentation (similar to Javadoc). Set to NO to disable this.
+# The default value is: YES.
+
+BRIEF_MEMBER_DESC      = YES
+
+# If the REPEAT_BRIEF tag is set to YES, doxygen will prepend the brief
+# description of a member or function before the detailed description
+#
+# Note: If both HIDE_UNDOC_MEMBERS and BRIEF_MEMBER_DESC are set to NO, the
+# brief descriptions will be completely suppressed.
+# The default value is: YES.
+
+REPEAT_BRIEF           = YES
+
+# This tag implements a quasi-intelligent brief description abbreviator that is
+# used to form the text in various listings. Each string in this list, if found
+# as the leading text of the brief description, will be stripped from the text
+# and the result, after processing the whole list, is used as the annotated
+# text. Otherwise, the brief description is used as-is. If left blank, the
+# following values are used ($name is automatically replaced with the name of
+# the entity):The $name class, The $name widget, The $name file, is, provides,
+# specifies, contains, represents, a, an and the.
+
+ABBREVIATE_BRIEF       =
+
+# If the ALWAYS_DETAILED_SEC and REPEAT_BRIEF tags are both set to YES then
+# doxygen will generate a detailed section even if there is only a brief
+# description.
+# The default value is: NO.
+
+ALWAYS_DETAILED_SEC    = NO
+
+# If the INLINE_INHERITED_MEMB tag is set to YES, doxygen will show all
+# inherited members of a class in the documentation of that class as if those
+# members were ordinary class members. Constructors, destructors and assignment
+# operators of the base classes will not be shown.
+# The default value is: NO.
+
+INLINE_INHERITED_MEMB  = NO
+
+# If the FULL_PATH_NAMES tag is set to YES, doxygen will prepend the full path
+# before files name in the file list and in the header files. If set to NO the
+# shortest path that makes the file name unique will be used
+# The default value is: YES.
+
+FULL_PATH_NAMES        = YES
+
+# The STRIP_FROM_PATH tag can be used to strip a user-defined part of the path.
+# Stripping is only done if one of the specified strings matches the left-hand
+# part of the path. The tag can be used to show relative paths in the file list.
+# If left blank the directory from which doxygen is run is used as the path to
+# strip.
+#
+# Note that you can specify absolute paths here, but also relative paths, which
+# will be relative from the directory where doxygen is started.
+# This tag requires that the tag FULL_PATH_NAMES is set to YES.
+
+STRIP_FROM_PATH        =
+
+# The STRIP_FROM_INC_PATH tag can be used to strip a user-defined part of the
+# path mentioned in the documentation of a class, which tells the reader which
+# header file to include in order to use a class. If left blank only the name of
+# the header file containing the class definition is used. Otherwise one should
+# specify the list of include paths that are normally passed to the compiler
+# using the -I flag.
+
+STRIP_FROM_INC_PATH    =
+
+# If the SHORT_NAMES tag is set to YES, doxygen will generate much shorter (but
+# less readable) file names. This can be useful is your file systems doesn't
+# support long names like on DOS, Mac, or CD-ROM.
+# The default value is: NO.
+
+SHORT_NAMES            = NO
+
+# If the JAVADOC_AUTOBRIEF tag is set to YES then doxygen will interpret the
+# first line (until the first dot) of a Javadoc-style comment as the brief
+# description. If set to NO, the Javadoc-style will behave just like regular Qt-
+# style comments (thus requiring an explicit @brief command for a brief
+# description.)
+# The default value is: NO.
+
+JAVADOC_AUTOBRIEF      = YES
+
+# If the QT_AUTOBRIEF tag is set to YES then doxygen will interpret the first
+# line (until the first dot) of a Qt-style comment as the brief description. If
+# set to NO, the Qt-style will behave just like regular Qt-style comments (thus
+# requiring an explicit \brief command for a brief description.)
+# The default value is: NO.
+
+QT_AUTOBRIEF           = NO
+
+# The MULTILINE_CPP_IS_BRIEF tag can be set to YES to make doxygen treat a
+# multi-line C++ special comment block (i.e. a block of //! or /// comments) as
+# a brief description. This used to be the default behavior. The new default is
+# to treat a multi-line C++ comment block as a detailed description. Set this
+# tag to YES if you prefer the old behavior instead.
+#
+# Note that setting this tag to YES also means that rational rose comments are
+# not recognized any more.
+# The default value is: NO.
+
+MULTILINE_CPP_IS_BRIEF = NO
+
+# If the INHERIT_DOCS tag is set to YES then an undocumented member inherits the
+# documentation from any documented member that it re-implements.
+# The default value is: YES.
+
+INHERIT_DOCS           = YES
+
+# If the SEPARATE_MEMBER_PAGES tag is set to YES then doxygen will produce a new
+# page for each member. If set to NO, the documentation of a member will be part
+# of the file/class/namespace that contains it.
+# The default value is: NO.
+
+SEPARATE_MEMBER_PAGES  = NO
+
+# The TAB_SIZE tag can be used to set the number of spaces in a tab. Doxygen
+# uses this value to replace tabs by spaces in code fragments.
+# Minimum value: 1, maximum value: 16, default value: 4.
+
+TAB_SIZE               = 2
+
+# This tag can be used to specify a number of aliases that act as commands in
+# the documentation. An alias has the form:
+# name=value
+# For example adding
+# "sideeffect=@par Side Effects:\n"
+# will allow you to put the command \sideeffect (or @sideeffect) in the
+# documentation, which will result in a user-defined paragraph with heading
+# "Side Effects:". You can put \n's in the value part of an alias to insert
+# newlines.
+
+ALIASES                =
+
+# This tag can be used to specify a number of word-keyword mappings (TCL only).
+# A mapping has the form "name=value". For example adding "class=itcl::class"
+# will allow you to use the command class in the itcl::class meaning.
+
+TCL_SUBST              =
+
+# Set the OPTIMIZE_OUTPUT_FOR_C tag to YES if your project consists of C sources
+# only. Doxygen will then generate output that is more tailored for C. For
+# instance, some of the names that are used will be different. The list of all
+# members will be omitted, etc.
+# The default value is: NO.
+
+OPTIMIZE_OUTPUT_FOR_C  = YES
+
+# Set the OPTIMIZE_OUTPUT_JAVA tag to YES if your project consists of Java or
+# Python sources only. Doxygen will then generate output that is more tailored
+# for that language. For instance, namespaces will be presented as packages,
+# qualified scopes will look different, etc.
+# The default value is: NO.
+
+OPTIMIZE_OUTPUT_JAVA   = NO
+
+# Set the OPTIMIZE_FOR_FORTRAN tag to YES if your project consists of Fortran
+# sources. Doxygen will then generate output that is tailored for Fortran.
+# The default value is: NO.
+
+OPTIMIZE_FOR_FORTRAN   = NO
+
+# Set the OPTIMIZE_OUTPUT_VHDL tag to YES if your project consists of VHDL
+# sources. Doxygen will then generate output that is tailored for VHDL.
+# The default value is: NO.
+
+OPTIMIZE_OUTPUT_VHDL   = NO
+
+# Doxygen selects the parser to use depending on the extension of the files it
+# parses. With this tag you can assign which parser to use for a given
+# extension. Doxygen has a built-in mapping, but you can override or extend it
+# using this tag. The format is ext=language, where ext is a file extension, and
+# language is one of the parsers supported by doxygen: IDL, Java, Javascript,
+# C#, C, C++, D, PHP, Objective-C, Python, Fortran (fixed format Fortran:
+# FortranFixed, free formatted Fortran: FortranFree, unknown formatted Fortran:
+# Fortran. In the later case the parser tries to guess whether the code is fixed
+# or free formatted code, this is the default for Fortran type files), VHDL. For
+# instance to make doxygen treat .inc files as Fortran files (default is PHP),
+# and .f files as C (default is Fortran), use: inc=Fortran f=C.
+#
+# Note: For files without extension you can use no_extension as a placeholder.
+#
+# Note that for custom extensions you also need to set FILE_PATTERNS otherwise
+# the files are not read by doxygen.
+
+EXTENSION_MAPPING      =
+
+# If the MARKDOWN_SUPPORT tag is enabled then doxygen pre-processes all comments
+# according to the Markdown format, which allows for more readable
+# documentation. See http://daringfireball.net/projects/markdown/ for details.
+# The output of markdown processing is further processed by doxygen, so you can
+# mix doxygen, HTML, and XML commands with Markdown formatting. Disable only in
+# case of backward compatibilities issues.
+# The default value is: YES.
+
+MARKDOWN_SUPPORT       = YES
+
+# When enabled doxygen tries to link words that correspond to documented
+# classes, or namespaces to their corresponding documentation. Such a link can
+# be prevented in individual cases by putting a % sign in front of the word or
+# globally by setting AUTOLINK_SUPPORT to NO.
+# The default value is: YES.
+
+AUTOLINK_SUPPORT       = YES
+
+# If you use STL classes (i.e. std::string, std::vector, etc.) but do not want
+# to include (a tag file for) the STL sources as input, then you should set this
+# tag to YES in order to let doxygen match functions declarations and
+# definitions whose arguments contain STL classes (e.g. func(std::string);
+# versus func(std::string) {}). This also make the inheritance and collaboration
+# diagrams that involve STL classes more complete and accurate.
+# The default value is: NO.
+
+BUILTIN_STL_SUPPORT    = NO
+
+# If you use Microsoft's C++/CLI language, you should set this option to YES to
+# enable parsing support.
+# The default value is: NO.
+
+CPP_CLI_SUPPORT        = NO
+
+# Set the SIP_SUPPORT tag to YES if your project consists of sip (see:
+# http://www.riverbankcomputing.co.uk/software/sip/intro) sources only. Doxygen
+# will parse them like normal C++ but will assume all classes use public instead
+# of private inheritance when no explicit protection keyword is present.
+# The default value is: NO.
+
+SIP_SUPPORT            = NO
+
+# For Microsoft's IDL there are propget and propput attributes to indicate
+# getter and setter methods for a property. Setting this option to YES will make
+# doxygen to replace the get and set methods by a property in the documentation.
+# This will only work if the methods are indeed getting or setting a simple
+# type. If this is not the case, or you want to show the methods anyway, you
+# should set this option to NO.
+# The default value is: YES.
+
+IDL_PROPERTY_SUPPORT   = YES
+
+# If member grouping is used in the documentation and the DISTRIBUTE_GROUP_DOC
+# tag is set to YES then doxygen will reuse the documentation of the first
+# member in the group (if any) for the other members of the group. By default
+# all members of a group must be documented explicitly.
+# The default value is: NO.
+
+DISTRIBUTE_GROUP_DOC   = NO
+
+# Set the SUBGROUPING tag to YES to allow class member groups of the same type
+# (for instance a group of public functions) to be put as a subgroup of that
+# type (e.g. under the Public Functions section). Set it to NO to prevent
+# subgrouping. Alternatively, this can be done per class using the
+# \nosubgrouping command.
+# The default value is: YES.
+
+SUBGROUPING            = YES
+
+# When the INLINE_GROUPED_CLASSES tag is set to YES, classes, structs and unions
+# are shown inside the group in which they are included (e.g. using \ingroup)
+# instead of on a separate page (for HTML and Man pages) or section (for LaTeX
+# and RTF).
+#
+# Note that this feature does not work in combination with
+# SEPARATE_MEMBER_PAGES.
+# The default value is: NO.
+
+INLINE_GROUPED_CLASSES = NO
+
+# When the INLINE_SIMPLE_STRUCTS tag is set to YES, structs, classes, and unions
+# with only public data fields or simple typedef fields will be shown inline in
+# the documentation of the scope in which they are defined (i.e. file,
+# namespace, or group documentation), provided this scope is documented. If set
+# to NO, structs, classes, and unions are shown on a separate page (for HTML and
+# Man pages) or section (for LaTeX and RTF).
+# The default value is: NO.
+
+INLINE_SIMPLE_STRUCTS  = NO
+
+# When TYPEDEF_HIDES_STRUCT tag is enabled, a typedef of a struct, union, or
+# enum is documented as struct, union, or enum with the name of the typedef. So
+# typedef struct TypeS {} TypeT, will appear in the documentation as a struct
+# with name TypeT. When disabled the typedef will appear as a member of a file,
+# namespace, or class. And the struct will be named TypeS. This can typically be
+# useful for C code in case the coding convention dictates that all compound
+# types are typedef'ed and only the typedef is referenced, never the tag name.
+# The default value is: NO.
+
+TYPEDEF_HIDES_STRUCT   = NO
+
+# The size of the symbol lookup cache can be set using LOOKUP_CACHE_SIZE. This
+# cache is used to resolve symbols given their name and scope. Since this can be
+# an expensive process and often the same symbol appears multiple times in the
+# code, doxygen keeps a cache of pre-resolved symbols. If the cache is too small
+# doxygen will become slower. If the cache is too large, memory is wasted. The
+# cache size is given by this formula: 2^(16+LOOKUP_CACHE_SIZE). The valid range
+# is 0..9, the default is 0, corresponding to a cache size of 2^16=65536
+# symbols. At the end of a run doxygen will report the cache usage and suggest
+# the optimal cache size from a speed point of view.
+# Minimum value: 0, maximum value: 9, default value: 0.
+
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+SORT_MEMBERS_CTORS_1ST = NO
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+# If the SORT_GROUP_NAMES tag is set to YES then doxygen will sort the hierarchy
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+SORT_BY_SCOPE_NAME     = NO
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+# If the STRICT_PROTO_MATCHING option is enabled and doxygen fails to do proper
+# type resolution of all parameters of a function it will reject a match between
+# the prototype and the implementation of a member function even if there is
+# only one candidate or it is obvious which candidate to choose by doing a
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+STRICT_PROTO_MATCHING  = NO
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+# The GENERATE_TODOLIST tag can be used to enable (YES) or disable (NO) the todo
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+# The GENERATE_TESTLIST tag can be used to enable (YES) or disable (NO) the test
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+# The GENERATE_BUGLIST tag can be used to enable (YES) or disable (NO) the bug
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+GENERATE_BUGLIST       = YES
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+# The GENERATE_DEPRECATEDLIST tag can be used to enable (YES) or disable (NO)
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+# The ENABLED_SECTIONS tag can be used to enable conditional documentation
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+# Set the SHOW_USED_FILES tag to NO to disable the list of files generated at
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+SHOW_NAMESPACES        = YES
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+#
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+# tag is left empty.
+
+LAYOUT_FILE            =
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+# The CITE_BIB_FILES tag can be used to specify one or more bib files containing
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+# For LaTeX the style of the bibliography can be controlled using
+# LATEX_BIB_STYLE. To use this feature you need bibtex and perl available in the
+# search path. See also \cite for info how to create references.
+
+CITE_BIB_FILES         =
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+#---------------------------------------------------------------------------
+# Configuration options related to warning and progress messages
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+# The QUIET tag can be used to turn on/off the messages that are generated to
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+# The default value is: NO.
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+QUIET                  = NO
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+# The WARNINGS tag can be used to turn on/off the warning messages that are
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+# Tip: Turn warnings on while writing the documentation.
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+# The default value is: YES.
+
+WARN_IF_UNDOCUMENTED   = YES
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+# If the WARN_IF_DOC_ERROR tag is set to YES, doxygen will generate warnings for
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+# The default value is: YES.
+
+WARN_IF_DOC_ERROR      = YES
+
+# This WARN_NO_PARAMDOC option can be enabled to get warnings for functions that
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+# value. If set to NO, doxygen will only warn about wrong or incomplete
+# parameter documentation, but not about the absence of documentation.
+# The default value is: NO.
+
+WARN_NO_PARAMDOC       = NO
+
+# The WARN_FORMAT tag determines the format of the warning messages that doxygen
+# can produce. The string should contain the $file, $line, and $text tags, which
+# will be replaced by the file and line number from which the warning originated
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+# The default value is: $file:$line: $text.
+
+WARN_FORMAT            = "$file:$line: $text"
+
+# The WARN_LOGFILE tag can be used to specify a file to which warning and error
+# messages should be written. If left blank the output is written to standard
+# error (stderr).
+
+WARN_LOGFILE           =
+
+#---------------------------------------------------------------------------
+# Configuration options related to the input files
+#---------------------------------------------------------------------------
+
+# The INPUT tag is used to specify the files and/or directories that contain
+# documented source files. You may enter file names like myfile.cpp or
+# directories like /usr/src/myproject. Separate the files or directories with
+# spaces.
+# Note: If this tag is empty the current directory is searched.
+
+INPUT                  = include/grpc++/alarm.h \
+include/grpc++/channel.h \
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+include/grpc++/completion_queue.h \
+include/grpc++/create_channel.h \
+include/grpc++/generic/async_generic_service.h \
+include/grpc++/generic/generic_stub.h \
+include/grpc++/grpc++.h \
+include/grpc++/impl/call.h \
+include/grpc++/impl/client_unary_call.h \
+include/grpc++/impl/codegen/core_codegen.h \
+include/grpc++/impl/grpc_library.h \
+include/grpc++/impl/method_handler_impl.h \
+include/grpc++/impl/rpc_method.h \
+include/grpc++/impl/rpc_service_method.h \
+include/grpc++/impl/serialization_traits.h \
+include/grpc++/impl/server_builder_option.h \
+include/grpc++/impl/server_builder_plugin.h \
+include/grpc++/impl/server_initializer.h \
+include/grpc++/impl/service_type.h \
+include/grpc++/impl/sync.h \
+include/grpc++/impl/sync_cxx11.h \
+include/grpc++/impl/sync_no_cxx11.h \
+include/grpc++/impl/thd.h \
+include/grpc++/impl/thd_cxx11.h \
+include/grpc++/impl/thd_no_cxx11.h \
+include/grpc++/security/auth_context.h \
+include/grpc++/security/auth_metadata_processor.h \
+include/grpc++/security/credentials.h \
+include/grpc++/security/server_credentials.h \
+include/grpc++/server.h \
+include/grpc++/server_builder.h \
+include/grpc++/server_context.h \
+include/grpc++/support/async_stream.h \
+include/grpc++/support/async_unary_call.h \
+include/grpc++/support/byte_buffer.h \
+include/grpc++/support/channel_arguments.h \
+include/grpc++/support/config.h \
+include/grpc++/support/slice.h \
+include/grpc++/support/status.h \
+include/grpc++/support/status_code_enum.h \
+include/grpc++/support/string_ref.h \
+include/grpc++/support/stub_options.h \
+include/grpc++/support/sync_stream.h \
+include/grpc++/support/time.h \
+include/grpc++/impl/codegen/async_stream.h \
+include/grpc++/impl/codegen/async_unary_call.h \
+include/grpc++/impl/codegen/call.h \
+include/grpc++/impl/codegen/call_hook.h \
+include/grpc++/impl/codegen/channel_interface.h \
+include/grpc++/impl/codegen/client_context.h \
+include/grpc++/impl/codegen/client_unary_call.h \
+include/grpc++/impl/codegen/completion_queue.h \
+include/grpc++/impl/codegen/completion_queue_tag.h \
+include/grpc++/impl/codegen/config.h \
+include/grpc++/impl/codegen/core_codegen_interface.h \
+include/grpc++/impl/codegen/create_auth_context.h \
+include/grpc++/impl/codegen/grpc_library.h \
+include/grpc++/impl/codegen/method_handler_impl.h \
+include/grpc++/impl/codegen/rpc_method.h \
+include/grpc++/impl/codegen/rpc_service_method.h \
+include/grpc++/impl/codegen/security/auth_context.h \
+include/grpc++/impl/codegen/serialization_traits.h \
+include/grpc++/impl/codegen/server_context.h \
+include/grpc++/impl/codegen/server_interface.h \
+include/grpc++/impl/codegen/service_type.h \
+include/grpc++/impl/codegen/status.h \
+include/grpc++/impl/codegen/status_code_enum.h \
+include/grpc++/impl/codegen/string_ref.h \
+include/grpc++/impl/codegen/stub_options.h \
+include/grpc++/impl/codegen/sync.h \
+include/grpc++/impl/codegen/sync_cxx11.h \
+include/grpc++/impl/codegen/sync_no_cxx11.h \
+include/grpc++/impl/codegen/sync_stream.h \
+include/grpc++/impl/codegen/time.h \
+include/grpc/impl/codegen/byte_buffer.h \
+include/grpc/impl/codegen/byte_buffer_reader.h \
+include/grpc/impl/codegen/compression_types.h \
+include/grpc/impl/codegen/connectivity_state.h \
+include/grpc/impl/codegen/grpc_types.h \
+include/grpc/impl/codegen/propagation_bits.h \
+include/grpc/impl/codegen/status.h \
+include/grpc/impl/codegen/alloc.h \
+include/grpc/impl/codegen/atm.h \
+include/grpc/impl/codegen/atm_gcc_atomic.h \
+include/grpc/impl/codegen/atm_gcc_sync.h \
+include/grpc/impl/codegen/atm_windows.h \
+include/grpc/impl/codegen/log.h \
+include/grpc/impl/codegen/port_platform.h \
+include/grpc/impl/codegen/slice.h \
+include/grpc/impl/codegen/slice_buffer.h \
+include/grpc/impl/codegen/sync.h \
+include/grpc/impl/codegen/sync_generic.h \
+include/grpc/impl/codegen/sync_posix.h \
+include/grpc/impl/codegen/sync_windows.h \
+include/grpc/impl/codegen/time.h \
+<<<<<<< HEAD
+include/grpc++/impl/codegen/config.h \
+include/grpc++/impl/codegen/config_protobuf.h \
+include/grpc++/support/config.h \
+include/grpc++/support/config_protobuf.h \
+include/grpc++/impl/codegen/core_codegen.h \
+=======
+>>>>>>> d30d4e279c4a63effaa6e912fc00bd4ad96054c7
+src/cpp/client/secure_credentials.h \
+src/cpp/common/secure_auth_context.h \
+src/cpp/server/secure_server_credentials.h \
+src/cpp/client/create_channel_internal.h \
+src/cpp/server/dynamic_thread_pool.h \
+src/cpp/server/thread_pool_interface.h \
+src/cpp/client/secure_credentials.cc \
+src/cpp/common/auth_property_iterator.cc \
+src/cpp/common/secure_auth_context.cc \
+src/cpp/common/secure_channel_arguments.cc \
+src/cpp/common/secure_create_auth_context.cc \
+src/cpp/server/secure_server_credentials.cc \
+src/cpp/client/channel.cc \
+src/cpp/client/client_context.cc \
+src/cpp/client/create_channel.cc \
+src/cpp/client/create_channel_internal.cc \
+src/cpp/client/credentials.cc \
+src/cpp/client/generic_stub.cc \
+src/cpp/client/insecure_credentials.cc \
+src/cpp/common/channel_arguments.cc \
+src/cpp/common/completion_queue.cc \
+src/cpp/common/core_codegen.cc \
+src/cpp/common/rpc_method.cc \
+src/cpp/server/async_generic_service.cc \
+src/cpp/server/create_default_thread_pool.cc \
+src/cpp/server/dynamic_thread_pool.cc \
+src/cpp/server/insecure_server_credentials.cc \
+src/cpp/server/server.cc \
+src/cpp/server/server_builder.cc \
+src/cpp/server/server_context.cc \
+src/cpp/server/server_credentials.cc \
+src/cpp/util/byte_buffer.cc \
+src/cpp/util/slice.cc \
+src/cpp/util/status.cc \
+src/cpp/util/string_ref.cc \
+src/cpp/util/time.cc \
+src/cpp/codegen/codegen_init.cc
+
+# This tag can be used to specify the character encoding of the source files
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+
+INPUT_ENCODING         = UTF-8
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+# If the value of the INPUT tag contains directories, you can use the
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+# *.h++, *.cs, *.d, *.php, *.php4, *.php5, *.phtml, *.inc, *.m, *.markdown,
+# *.md, *.mm, *.dox, *.py, *.f90, *.f, *.for, *.tcl, *.vhd, *.vhdl, *.ucf,
+# *.qsf, *.as and *.js.
+
+FILE_PATTERNS          =
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+# The RECURSIVE tag can be used to specify whether or not subdirectories should
+# be searched for input files as well.
+# The default value is: NO.
+
+RECURSIVE              = NO
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+# The EXCLUDE tag can be used to specify files and/or directories that should be
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+
+EXCLUDE                =
+
+# The EXCLUDE_SYMLINKS tag can be used to select whether or not files or
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+# The default value is: NO.
+
+EXCLUDE_SYMLINKS       = NO
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+# If the value of the INPUT tag contains directories, you can use the
+# EXCLUDE_PATTERNS tag to specify one or more wildcard patterns to exclude
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+#
+# Note that the wildcards are matched against the file with absolute path, so to
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+EXCLUDE_PATTERNS       =
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+# The EXCLUDE_SYMBOLS tag can be used to specify one or more symbol names
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+# output. The symbol name can be a fully qualified name, a word, or if the
+# wildcard * is used, a substring. Examples: ANamespace, AClass,
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+#
+# Note that the wildcards are matched against the file with absolute path, so to
+# exclude all test directories use the pattern */test/*
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+EXCLUDE_SYMBOLS        =
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+# The EXAMPLE_PATH tag can be used to specify one or more files or directories
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+
+EXAMPLE_PATH           =
+
+# If the value of the EXAMPLE_PATH tag contains directories, you can use the
+# EXAMPLE_PATTERNS tag to specify one or more wildcard pattern (like *.cpp and
+# *.h) to filter out the source-files in the directories. If left blank all
+# files are included.
+
+EXAMPLE_PATTERNS       =
+
+# If the EXAMPLE_RECURSIVE tag is set to YES then subdirectories will be
+# searched for input files to be used with the \include or \dontinclude commands
+# irrespective of the value of the RECURSIVE tag.
+# The default value is: NO.
+
+EXAMPLE_RECURSIVE      = NO
+
+# The IMAGE_PATH tag can be used to specify one or more files or directories
+# that contain images that are to be included in the documentation (see the
+# \image command).
+
+IMAGE_PATH             =
+
+# The INPUT_FILTER tag can be used to specify a program that doxygen should
+# invoke to filter for each input file. Doxygen will invoke the filter program
+# by executing (via popen()) the command:
+#
+# <filter> <input-file>
+#
+# where <filter> is the value of the INPUT_FILTER tag, and <input-file> is the
+# name of an input file. Doxygen will then use the output that the filter
+# program writes to standard output. If FILTER_PATTERNS is specified, this tag
+# will be ignored.
+#
+# Note that the filter must not add or remove lines; it is applied before the
+# code is scanned, but not when the output code is generated. If lines are added
+# or removed, the anchors will not be placed correctly.
+
+INPUT_FILTER           =
+
+# The FILTER_PATTERNS tag can be used to specify filters on a per file pattern
+# basis. Doxygen will compare the file name with each pattern and apply the
+# filter if there is a match. The filters are a list of the form: pattern=filter
+# (like *.cpp=my_cpp_filter). See INPUT_FILTER for further information on how
+# filters are used. If the FILTER_PATTERNS tag is empty or if none of the
+# patterns match the file name, INPUT_FILTER is applied.
+
+FILTER_PATTERNS        =
+
+# If the FILTER_SOURCE_FILES tag is set to YES, the input filter (if set using
+# INPUT_FILTER) will also be used to filter the input files that are used for
+# producing the source files to browse (i.e. when SOURCE_BROWSER is set to YES).
+# The default value is: NO.
+
+FILTER_SOURCE_FILES    = NO
+
+# The FILTER_SOURCE_PATTERNS tag can be used to specify source filters per file
+# pattern. A pattern will override the setting for FILTER_PATTERN (if any) and
+# it is also possible to disable source filtering for a specific pattern using
+# *.ext= (so without naming a filter).
+# This tag requires that the tag FILTER_SOURCE_FILES is set to YES.
+
+FILTER_SOURCE_PATTERNS =
+
+# If the USE_MDFILE_AS_MAINPAGE tag refers to the name of a markdown file that
+# is part of the input, its contents will be placed on the main page
+# (index.html). This can be useful if you have a project on for instance GitHub
+# and want to reuse the introduction page also for the doxygen output.
+
+USE_MDFILE_AS_MAINPAGE =
+
+#---------------------------------------------------------------------------
+# Configuration options related to source browsing
+#---------------------------------------------------------------------------
+
+# If the SOURCE_BROWSER tag is set to YES then a list of source files will be
+# generated. Documented entities will be cross-referenced with these sources.
+#
+# Note: To get rid of all source code in the generated output, make sure that
+# also VERBATIM_HEADERS is set to NO.
+# The default value is: NO.
+
+SOURCE_BROWSER         = NO
+
+# Setting the INLINE_SOURCES tag to YES will include the body of functions,
+# classes and enums directly into the documentation.
+# The default value is: NO.
+
+INLINE_SOURCES         = NO
+
+# Setting the STRIP_CODE_COMMENTS tag to YES will instruct doxygen to hide any
+# special comment blocks from generated source code fragments. Normal C, C++ and
+# Fortran comments will always remain visible.
+# The default value is: YES.
+
+STRIP_CODE_COMMENTS    = YES
+
+# If the REFERENCED_BY_RELATION tag is set to YES then for each documented
+# function all documented functions referencing it will be listed.
+# The default value is: NO.
+
+REFERENCED_BY_RELATION = NO
+
+# If the REFERENCES_RELATION tag is set to YES then for each documented function
+# all documented entities called/used by that function will be listed.
+# The default value is: NO.
+
+REFERENCES_RELATION    = NO
+
+# If the REFERENCES_LINK_SOURCE tag is set to YES and SOURCE_BROWSER tag is set
+# to YES then the hyperlinks from functions in REFERENCES_RELATION and
+# REFERENCED_BY_RELATION lists will link to the source code. Otherwise they will
+# link to the documentation.
+# The default value is: YES.
+
+REFERENCES_LINK_SOURCE = YES
+
+# If SOURCE_TOOLTIPS is enabled (the default) then hovering a hyperlink in the
+# source code will show a tooltip with additional information such as prototype,
+# brief description and links to the definition and documentation. Since this
+# will make the HTML file larger and loading of large files a bit slower, you
+# can opt to disable this feature.
+# The default value is: YES.
+# This tag requires that the tag SOURCE_BROWSER is set to YES.
+
+SOURCE_TOOLTIPS        = YES
+
+# If the USE_HTAGS tag is set to YES then the references to source code will
+# point to the HTML generated by the htags(1) tool instead of doxygen built-in
+# source browser. The htags tool is part of GNU's global source tagging system
+# (see http://www.gnu.org/software/global/global.html). You will need version
+# 4.8.6 or higher.
+#
+# To use it do the following:
+# - Install the latest version of global
+# - Enable SOURCE_BROWSER and USE_HTAGS in the config file
+# - Make sure the INPUT points to the root of the source tree
+# - Run doxygen as normal
+#
+# Doxygen will invoke htags (and that will in turn invoke gtags), so these
+# tools must be available from the command line (i.e. in the search path).
+#
+# The result: instead of the source browser generated by doxygen, the links to
+# source code will now point to the output of htags.
+# The default value is: NO.
+# This tag requires that the tag SOURCE_BROWSER is set to YES.
+
+USE_HTAGS              = NO
+
+# If the VERBATIM_HEADERS tag is set the YES then doxygen will generate a
+# verbatim copy of the header file for each class for which an include is
+# specified. Set to NO to disable this.
+# See also: Section \class.
+# The default value is: YES.
+
+VERBATIM_HEADERS       = YES
+
+#---------------------------------------------------------------------------
+# Configuration options related to the alphabetical class index
+#---------------------------------------------------------------------------
+
+# If the ALPHABETICAL_INDEX tag is set to YES, an alphabetical index of all
+# compounds will be generated. Enable this if the project contains a lot of
+# classes, structs, unions or interfaces.
+# The default value is: YES.
+
+ALPHABETICAL_INDEX     = YES
+
+# The COLS_IN_ALPHA_INDEX tag can be used to specify the number of columns in
+# which the alphabetical index list will be split.
+# Minimum value: 1, maximum value: 20, default value: 5.
+# This tag requires that the tag ALPHABETICAL_INDEX is set to YES.
+
+COLS_IN_ALPHA_INDEX    = 5
+
+# In case all classes in a project start with a common prefix, all classes will
+# be put under the same header in the alphabetical index. The IGNORE_PREFIX tag
+# can be used to specify a prefix (or a list of prefixes) that should be ignored
+# while generating the index headers.
+# This tag requires that the tag ALPHABETICAL_INDEX is set to YES.
+
+IGNORE_PREFIX          =
+
+#---------------------------------------------------------------------------
+# Configuration options related to the HTML output
+#---------------------------------------------------------------------------
+
+# If the GENERATE_HTML tag is set to YES, doxygen will generate HTML output
+# The default value is: YES.
+
+GENERATE_HTML          = YES
+
+# The HTML_OUTPUT tag is used to specify where the HTML docs will be put. If a
+# relative path is entered the value of OUTPUT_DIRECTORY will be put in front of
+# it.
+# The default directory is: html.
+# This tag requires that the tag GENERATE_HTML is set to YES.
+
+HTML_OUTPUT            = html
+
+# The HTML_FILE_EXTENSION tag can be used to specify the file extension for each
+# generated HTML page (for example: .htm, .php, .asp).
+# The default value is: .html.
+# This tag requires that the tag GENERATE_HTML is set to YES.
+
+HTML_FILE_EXTENSION    = .html
+
+# The HTML_HEADER tag can be used to specify a user-defined HTML header file for
+# each generated HTML page. If the tag is left blank doxygen will generate a
+# standard header.
+#
+# To get valid HTML the header file that includes any scripts and style sheets
+# that doxygen needs, which is dependent on the configuration options used (e.g.
+# the setting GENERATE_TREEVIEW). It is highly recommended to start with a
+# default header using
+# doxygen -w html new_header.html new_footer.html new_stylesheet.css
+# YourConfigFile
+# and then modify the file new_header.html. See also section "Doxygen usage"
+# for information on how to generate the default header that doxygen normally
+# uses.
+# Note: The header is subject to change so you typically have to regenerate the
+# default header when upgrading to a newer version of doxygen. For a description
+# of the possible markers and block names see the documentation.
+# This tag requires that the tag GENERATE_HTML is set to YES.
+
+HTML_HEADER            =
+
+# The HTML_FOOTER tag can be used to specify a user-defined HTML footer for each
+# generated HTML page. If the tag is left blank doxygen will generate a standard
+# footer. See HTML_HEADER for more information on how to generate a default
+# footer and what special commands can be used inside the footer. See also
+# section "Doxygen usage" for information on how to generate the default footer
+# that doxygen normally uses.
+# This tag requires that the tag GENERATE_HTML is set to YES.
+
+HTML_FOOTER            =
+
+# The HTML_STYLESHEET tag can be used to specify a user-defined cascading style
+# sheet that is used by each HTML page. It can be used to fine-tune the look of
+# the HTML output. If left blank doxygen will generate a default style sheet.
+# See also section "Doxygen usage" for information on how to generate the style
+# sheet that doxygen normally uses.
+# Note: It is recommended to use HTML_EXTRA_STYLESHEET instead of this tag, as
+# it is more robust and this tag (HTML_STYLESHEET) will in the future become
+# obsolete.
+# This tag requires that the tag GENERATE_HTML is set to YES.
+
+HTML_STYLESHEET        =
+
+# The HTML_EXTRA_STYLESHEET tag can be used to specify additional user-defined
+# cascading style sheets that are included after the standard style sheets
+# created by doxygen. Using this option one can overrule certain style aspects.
+# This is preferred over using HTML_STYLESHEET since it does not replace the
+# standard style sheet and is therefore more robust against future updates.
+# Doxygen will copy the style sheet files to the output directory.
+# Note: The order of the extra style sheet files is of importance (e.g. the last
+# style sheet in the list overrules the setting of the previous ones in the
+# list). For an example see the documentation.
+# This tag requires that the tag GENERATE_HTML is set to YES.
+
+HTML_EXTRA_STYLESHEET  =
+
+# The HTML_EXTRA_FILES tag can be used to specify one or more extra images or
+# other source files which should be copied to the HTML output directory. Note
+# that these files will be copied to the base HTML output directory. Use the
+# $relpath^ marker in the HTML_HEADER and/or HTML_FOOTER files to load these
+# files. In the HTML_STYLESHEET file, use the file name only. Also note that the
+# files will be copied as-is; there are no commands or markers available.
+# This tag requires that the tag GENERATE_HTML is set to YES.
+
+HTML_EXTRA_FILES       =
+
+# The HTML_COLORSTYLE_HUE tag controls the color of the HTML output. Doxygen
+# will adjust the colors in the style sheet and background images according to
+# this color. Hue is specified as an angle on a colorwheel, see
+# http://en.wikipedia.org/wiki/Hue for more information. For instance the value
+# 0 represents red, 60 is yellow, 120 is green, 180 is cyan, 240 is blue, 300
+# purple, and 360 is red again.
+# Minimum value: 0, maximum value: 359, default value: 220.
+# This tag requires that the tag GENERATE_HTML is set to YES.
+
+HTML_COLORSTYLE_HUE    = 220
+
+# The HTML_COLORSTYLE_SAT tag controls the purity (or saturation) of the colors
+# in the HTML output. For a value of 0 the output will use grayscales only. A
+# value of 255 will produce the most vivid colors.
+# Minimum value: 0, maximum value: 255, default value: 100.
+# This tag requires that the tag GENERATE_HTML is set to YES.
+
+HTML_COLORSTYLE_SAT    = 100
+
+# The HTML_COLORSTYLE_GAMMA tag controls the gamma correction applied to the
+# luminance component of the colors in the HTML output. Values below 100
+# gradually make the output lighter, whereas values above 100 make the output
+# darker. The value divided by 100 is the actual gamma applied, so 80 represents
+# a gamma of 0.8, The value 220 represents a gamma of 2.2, and 100 does not
+# change the gamma.
+# Minimum value: 40, maximum value: 240, default value: 80.
+# This tag requires that the tag GENERATE_HTML is set to YES.
+
+HTML_COLORSTYLE_GAMMA  = 80
+
+# If the HTML_TIMESTAMP tag is set to YES then the footer of each generated HTML
+# page will contain the date and time when the page was generated. Setting this
+# to NO can help when comparing the output of multiple runs.
+# The default value is: YES.
+# This tag requires that the tag GENERATE_HTML is set to YES.
+
+HTML_TIMESTAMP         = YES
+
+# If the HTML_DYNAMIC_SECTIONS tag is set to YES then the generated HTML
+# documentation will contain sections that can be hidden and shown after the
+# page has loaded.
+# The default value is: NO.
+# This tag requires that the tag GENERATE_HTML is set to YES.
+
+HTML_DYNAMIC_SECTIONS  = NO
+
+# With HTML_INDEX_NUM_ENTRIES one can control the preferred number of entries
+# shown in the various tree structured indices initially; the user can expand
+# and collapse entries dynamically later on. Doxygen will expand the tree to
+# such a level that at most the specified number of entries are visible (unless
+# a fully collapsed tree already exceeds this amount). So setting the number of
+# entries 1 will produce a full collapsed tree by default. 0 is a special value
+# representing an infinite number of entries and will result in a full expanded
+# tree by default.
+# Minimum value: 0, maximum value: 9999, default value: 100.
+# This tag requires that the tag GENERATE_HTML is set to YES.
+
+HTML_INDEX_NUM_ENTRIES = 100
+
+# If the GENERATE_DOCSET tag is set to YES, additional index files will be
+# generated that can be used as input for Apple's Xcode 3 integrated development
+# environment (see: http://developer.apple.com/tools/xcode/), introduced with
+# OSX 10.5 (Leopard). To create a documentation set, doxygen will generate a
+# Makefile in the HTML output directory. Running make will produce the docset in
+# that directory and running make install will install the docset in
+# ~/Library/Developer/Shared/Documentation/DocSets so that Xcode will find it at
+# startup. See http://developer.apple.com/tools/creatingdocsetswithdoxygen.html
+# for more information.
+# The default value is: NO.
+# This tag requires that the tag GENERATE_HTML is set to YES.
+
+GENERATE_DOCSET        = NO
+
+# This tag determines the name of the docset feed. A documentation feed provides
+# an umbrella under which multiple documentation sets from a single provider
+# (such as a company or product suite) can be grouped.
+# The default value is: Doxygen generated docs.
+# This tag requires that the tag GENERATE_DOCSET is set to YES.
+
+DOCSET_FEEDNAME        = "Doxygen generated docs"
+
+# This tag specifies a string that should uniquely identify the documentation
+# set bundle. This should be a reverse domain-name style string, e.g.
+# com.mycompany.MyDocSet. Doxygen will append .docset to the name.
+# The default value is: org.doxygen.Project.
+# This tag requires that the tag GENERATE_DOCSET is set to YES.
+
+DOCSET_BUNDLE_ID       = org.doxygen.Project
+
+# The DOCSET_PUBLISHER_ID tag specifies a string that should uniquely identify
+# the documentation publisher. This should be a reverse domain-name style
+# string, e.g. com.mycompany.MyDocSet.documentation.
+# The default value is: org.doxygen.Publisher.
+# This tag requires that the tag GENERATE_DOCSET is set to YES.
+
+DOCSET_PUBLISHER_ID    = org.doxygen.Publisher
+
+# The DOCSET_PUBLISHER_NAME tag identifies the documentation publisher.
+# The default value is: Publisher.
+# This tag requires that the tag GENERATE_DOCSET is set to YES.
+
+DOCSET_PUBLISHER_NAME  = Publisher
+
+# If the GENERATE_HTMLHELP tag is set to YES then doxygen generates three
+# additional HTML index files: index.hhp, index.hhc, and index.hhk. The
+# index.hhp is a project file that can be read by Microsoft's HTML Help Workshop
+# (see: http://www.microsoft.com/en-us/download/details.aspx?id=21138) on
+# Windows.
+#
+# The HTML Help Workshop contains a compiler that can convert all HTML output
+# generated by doxygen into a single compiled HTML file (.chm). Compiled HTML
+# files are now used as the Windows 98 help format, and will replace the old
+# Windows help format (.hlp) on all Windows platforms in the future. Compressed
+# HTML files also contain an index, a table of contents, and you can search for
+# words in the documentation. The HTML workshop also contains a viewer for
+# compressed HTML files.
+# The default value is: NO.
+# This tag requires that the tag GENERATE_HTML is set to YES.
+
+GENERATE_HTMLHELP      = NO
+
+# The CHM_FILE tag can be used to specify the file name of the resulting .chm
+# file. You can add a path in front of the file if the result should not be
+# written to the html output directory.
+# This tag requires that the tag GENERATE_HTMLHELP is set to YES.
+
+CHM_FILE               =
+
+# The HHC_LOCATION tag can be used to specify the location (absolute path
+# including file name) of the HTML help compiler (hhc.exe). If non-empty,
+# doxygen will try to run the HTML help compiler on the generated index.hhp.
+# The file has to be specified with full path.
+# This tag requires that the tag GENERATE_HTMLHELP is set to YES.
+
+HHC_LOCATION           =
+
+# The GENERATE_CHI flag controls if a separate .chi index file is generated
+# (YES) or that it should be included in the master .chm file (NO).
+# The default value is: NO.
+# This tag requires that the tag GENERATE_HTMLHELP is set to YES.
+
+GENERATE_CHI           = NO
+
+# The CHM_INDEX_ENCODING is used to encode HtmlHelp index (hhk), content (hhc)
+# and project file content.
+# This tag requires that the tag GENERATE_HTMLHELP is set to YES.
+
+CHM_INDEX_ENCODING     =
+
+# The BINARY_TOC flag controls whether a binary table of contents is generated
+# (YES) or a normal table of contents (NO) in the .chm file. Furthermore it
+# enables the Previous and Next buttons.
+# The default value is: NO.
+# This tag requires that the tag GENERATE_HTMLHELP is set to YES.
+
+BINARY_TOC             = NO
+
+# The TOC_EXPAND flag can be set to YES to add extra items for group members to
+# the table of contents of the HTML help documentation and to the tree view.
+# The default value is: NO.
+# This tag requires that the tag GENERATE_HTMLHELP is set to YES.
+
+TOC_EXPAND             = NO
+
+# If the GENERATE_QHP tag is set to YES and both QHP_NAMESPACE and
+# QHP_VIRTUAL_FOLDER are set, an additional index file will be generated that
+# can be used as input for Qt's qhelpgenerator to generate a Qt Compressed Help
+# (.qch) of the generated HTML documentation.
+# The default value is: NO.
+# This tag requires that the tag GENERATE_HTML is set to YES.
+
+GENERATE_QHP           = NO
+
+# If the QHG_LOCATION tag is specified, the QCH_FILE tag can be used to specify
+# the file name of the resulting .qch file. The path specified is relative to
+# the HTML output folder.
+# This tag requires that the tag GENERATE_QHP is set to YES.
+
+QCH_FILE               =
+
+# The QHP_NAMESPACE tag specifies the namespace to use when generating Qt Help
+# Project output. For more information please see Qt Help Project / Namespace
+# (see: http://qt-project.org/doc/qt-4.8/qthelpproject.html#namespace).
+# The default value is: org.doxygen.Project.
+# This tag requires that the tag GENERATE_QHP is set to YES.
+
+QHP_NAMESPACE          = org.doxygen.Project
+
+# The QHP_VIRTUAL_FOLDER tag specifies the namespace to use when generating Qt
+# Help Project output. For more information please see Qt Help Project / Virtual
+# Folders (see: http://qt-project.org/doc/qt-4.8/qthelpproject.html#virtual-
+# folders).
+# The default value is: doc.
+# This tag requires that the tag GENERATE_QHP is set to YES.
+
+QHP_VIRTUAL_FOLDER     = doc
+
+# If the QHP_CUST_FILTER_NAME tag is set, it specifies the name of a custom
+# filter to add. For more information please see Qt Help Project / Custom
+# Filters (see: http://qt-project.org/doc/qt-4.8/qthelpproject.html#custom-
+# filters).
+# This tag requires that the tag GENERATE_QHP is set to YES.
+
+QHP_CUST_FILTER_NAME   =
+
+# The QHP_CUST_FILTER_ATTRS tag specifies the list of the attributes of the
+# custom filter to add. For more information please see Qt Help Project / Custom
+# Filters (see: http://qt-project.org/doc/qt-4.8/qthelpproject.html#custom-
+# filters).
+# This tag requires that the tag GENERATE_QHP is set to YES.
+
+QHP_CUST_FILTER_ATTRS  =
+
+# The QHP_SECT_FILTER_ATTRS tag specifies the list of the attributes this
+# project's filter section matches. Qt Help Project / Filter Attributes (see:
+# http://qt-project.org/doc/qt-4.8/qthelpproject.html#filter-attributes).
+# This tag requires that the tag GENERATE_QHP is set to YES.
+
+QHP_SECT_FILTER_ATTRS  =
+
+# The QHG_LOCATION tag can be used to specify the location of Qt's
+# qhelpgenerator. If non-empty doxygen will try to run qhelpgenerator on the
+# generated .qhp file.
+# This tag requires that the tag GENERATE_QHP is set to YES.
+
+QHG_LOCATION           =
+
+# If the GENERATE_ECLIPSEHELP tag is set to YES, additional index files will be
+# generated, together with the HTML files, they form an Eclipse help plugin. To
+# install this plugin and make it available under the help contents menu in
+# Eclipse, the contents of the directory containing the HTML and XML files needs
+# to be copied into the plugins directory of eclipse. The name of the directory
+# within the plugins directory should be the same as the ECLIPSE_DOC_ID value.
+# After copying Eclipse needs to be restarted before the help appears.
+# The default value is: NO.
+# This tag requires that the tag GENERATE_HTML is set to YES.
+
+GENERATE_ECLIPSEHELP   = NO
+
+# A unique identifier for the Eclipse help plugin. When installing the plugin
+# the directory name containing the HTML and XML files should also have this
+# name. Each documentation set should have its own identifier.
+# The default value is: org.doxygen.Project.
+# This tag requires that the tag GENERATE_ECLIPSEHELP is set to YES.
+
+ECLIPSE_DOC_ID         = org.doxygen.Project
+
+# If you want full control over the layout of the generated HTML pages it might
+# be necessary to disable the index and replace it with your own. The
+# DISABLE_INDEX tag can be used to turn on/off the condensed index (tabs) at top
+# of each HTML page. A value of NO enables the index and the value YES disables
+# it. Since the tabs in the index contain the same information as the navigation
+# tree, you can set this option to YES if you also set GENERATE_TREEVIEW to YES.
+# The default value is: NO.
+# This tag requires that the tag GENERATE_HTML is set to YES.
+
+DISABLE_INDEX          = NO
+
+# The GENERATE_TREEVIEW tag is used to specify whether a tree-like index
+# structure should be generated to display hierarchical information. If the tag
+# value is set to YES, a side panel will be generated containing a tree-like
+# index structure (just like the one that is generated for HTML Help). For this
+# to work a browser that supports JavaScript, DHTML, CSS and frames is required
+# (i.e. any modern browser). Windows users are probably better off using the
+# HTML help feature. Via custom style sheets (see HTML_EXTRA_STYLESHEET) one can
+# further fine-tune the look of the index. As an example, the default style
+# sheet generated by doxygen has an example that shows how to put an image at
+# the root of the tree instead of the PROJECT_NAME. Since the tree basically has
+# the same information as the tab index, you could consider setting
+# DISABLE_INDEX to YES when enabling this option.
+# The default value is: NO.
+# This tag requires that the tag GENERATE_HTML is set to YES.
+
+GENERATE_TREEVIEW      = NO
+
+# The ENUM_VALUES_PER_LINE tag can be used to set the number of enum values that
+# doxygen will group on one line in the generated HTML documentation.
+#
+# Note that a value of 0 will completely suppress the enum values from appearing
+# in the overview section.
+# Minimum value: 0, maximum value: 20, default value: 4.
+# This tag requires that the tag GENERATE_HTML is set to YES.
+
+ENUM_VALUES_PER_LINE   = 4
+
+# If the treeview is enabled (see GENERATE_TREEVIEW) then this tag can be used
+# to set the initial width (in pixels) of the frame in which the tree is shown.
+# Minimum value: 0, maximum value: 1500, default value: 250.
+# This tag requires that the tag GENERATE_HTML is set to YES.
+
+TREEVIEW_WIDTH         = 250
+
+# If the EXT_LINKS_IN_WINDOW option is set to YES, doxygen will open links to
+# external symbols imported via tag files in a separate window.
+# The default value is: NO.
+# This tag requires that the tag GENERATE_HTML is set to YES.
+
+EXT_LINKS_IN_WINDOW    = NO
+
+# Use this tag to change the font size of LaTeX formulas included as images in
+# the HTML documentation. When you change the font size after a successful
+# doxygen run you need to manually remove any form_*.png images from the HTML
+# output directory to force them to be regenerated.
+# Minimum value: 8, maximum value: 50, default value: 10.
+# This tag requires that the tag GENERATE_HTML is set to YES.
+
+FORMULA_FONTSIZE       = 10
+
+# Use the FORMULA_TRANPARENT tag to determine whether or not the images
+# generated for formulas are transparent PNGs. Transparent PNGs are not
+# supported properly for IE 6.0, but are supported on all modern browsers.
+#
+# Note that when changing this option you need to delete any form_*.png files in
+# the HTML output directory before the changes have effect.
+# The default value is: YES.
+# This tag requires that the tag GENERATE_HTML is set to YES.
+
+FORMULA_TRANSPARENT    = YES
+
+# Enable the USE_MATHJAX option to render LaTeX formulas using MathJax (see
+# http://www.mathjax.org) which uses client side Javascript for the rendering
+# instead of using pre-rendered bitmaps. Use this if you do not have LaTeX
+# installed or if you want to formulas look prettier in the HTML output. When
+# enabled you may also need to install MathJax separately and configure the path
+# to it using the MATHJAX_RELPATH option.
+# The default value is: NO.
+# This tag requires that the tag GENERATE_HTML is set to YES.
+
+USE_MATHJAX            = NO
+
+# When MathJax is enabled you can set the default output format to be used for
+# the MathJax output. See the MathJax site (see:
+# http://docs.mathjax.org/en/latest/output.html) for more details.
+# Possible values are: HTML-CSS (which is slower, but has the best
+# compatibility), NativeMML (i.e. MathML) and SVG.
+# The default value is: HTML-CSS.
+# This tag requires that the tag USE_MATHJAX is set to YES.
+
+MATHJAX_FORMAT         = HTML-CSS
+
+# When MathJax is enabled you need to specify the location relative to the HTML
+# output directory using the MATHJAX_RELPATH option. The destination directory
+# should contain the MathJax.js script. For instance, if the mathjax directory
+# is located at the same level as the HTML output directory, then
+# MATHJAX_RELPATH should be ../mathjax. The default value points to the MathJax
+# Content Delivery Network so you can quickly see the result without installing
+# MathJax. However, it is strongly recommended to install a local copy of
+# MathJax from http://www.mathjax.org before deployment.
+# The default value is: http://cdn.mathjax.org/mathjax/latest.
+# This tag requires that the tag USE_MATHJAX is set to YES.
+
+MATHJAX_RELPATH        = http://cdn.mathjax.org/mathjax/latest
+
+# The MATHJAX_EXTENSIONS tag can be used to specify one or more MathJax
+# extension names that should be enabled during MathJax rendering. For example
+# MATHJAX_EXTENSIONS = TeX/AMSmath TeX/AMSsymbols
+# This tag requires that the tag USE_MATHJAX is set to YES.
+
+MATHJAX_EXTENSIONS     =
+
+# The MATHJAX_CODEFILE tag can be used to specify a file with javascript pieces
+# of code that will be used on startup of the MathJax code. See the MathJax site
+# (see: http://docs.mathjax.org/en/latest/output.html) for more details. For an
+# example see the documentation.
+# This tag requires that the tag USE_MATHJAX is set to YES.
+
+MATHJAX_CODEFILE       =
+
+# When the SEARCHENGINE tag is enabled doxygen will generate a search box for
+# the HTML output. The underlying search engine uses javascript and DHTML and
+# should work on any modern browser. Note that when using HTML help
+# (GENERATE_HTMLHELP), Qt help (GENERATE_QHP), or docsets (GENERATE_DOCSET)
+# there is already a search function so this one should typically be disabled.
+# For large projects the javascript based search engine can be slow, then
+# enabling SERVER_BASED_SEARCH may provide a better solution. It is possible to
+# search using the keyboard; to jump to the search box use <access key> + S
+# (what the <access key> is depends on the OS and browser, but it is typically
+# <CTRL>, <ALT>/<option>, or both). Inside the search box use the <cursor down
+# key> to jump into the search results window, the results can be navigated
+# using the <cursor keys>. Press <Enter> to select an item or <escape> to cancel
+# the search. The filter options can be selected when the cursor is inside the
+# search box by pressing <Shift>+<cursor down>. Also here use the <cursor keys>
+# to select a filter and <Enter> or <escape> to activate or cancel the filter
+# option.
+# The default value is: YES.
+# This tag requires that the tag GENERATE_HTML is set to YES.
+
+SEARCHENGINE           = YES
+
+# When the SERVER_BASED_SEARCH tag is enabled the search engine will be
+# implemented using a web server instead of a web client using Javascript. There
+# are two flavors of web server based searching depending on the EXTERNAL_SEARCH
+# setting. When disabled, doxygen will generate a PHP script for searching and
+# an index file used by the script. When EXTERNAL_SEARCH is enabled the indexing
+# and searching needs to be provided by external tools. See the section
+# "External Indexing and Searching" for details.
+# The default value is: NO.
+# This tag requires that the tag SEARCHENGINE is set to YES.
+
+SERVER_BASED_SEARCH    = NO
+
+# When EXTERNAL_SEARCH tag is enabled doxygen will no longer generate the PHP
+# script for searching. Instead the search results are written to an XML file
+# which needs to be processed by an external indexer. Doxygen will invoke an
+# external search engine pointed to by the SEARCHENGINE_URL option to obtain the
+# search results.
+#
+# Doxygen ships with an example indexer (doxyindexer) and search engine
+# (doxysearch.cgi) which are based on the open source search engine library
+# Xapian (see: http://xapian.org/).
+#
+# See the section "External Indexing and Searching" for details.
+# The default value is: NO.
+# This tag requires that the tag SEARCHENGINE is set to YES.
+
+EXTERNAL_SEARCH        = NO
+
+# The SEARCHENGINE_URL should point to a search engine hosted by a web server
+# which will return the search results when EXTERNAL_SEARCH is enabled.
+#
+# Doxygen ships with an example indexer (doxyindexer) and search engine
+# (doxysearch.cgi) which are based on the open source search engine library
+# Xapian (see: http://xapian.org/). See the section "External Indexing and
+# Searching" for details.
+# This tag requires that the tag SEARCHENGINE is set to YES.
+
+SEARCHENGINE_URL       =
+
+# When SERVER_BASED_SEARCH and EXTERNAL_SEARCH are both enabled the unindexed
+# search data is written to a file for indexing by an external tool. With the
+# SEARCHDATA_FILE tag the name of this file can be specified.
+# The default file is: searchdata.xml.
+# This tag requires that the tag SEARCHENGINE is set to YES.
+
+SEARCHDATA_FILE        = searchdata.xml
+
+# When SERVER_BASED_SEARCH and EXTERNAL_SEARCH are both enabled the
+# EXTERNAL_SEARCH_ID tag can be used as an identifier for the project. This is
+# useful in combination with EXTRA_SEARCH_MAPPINGS to search through multiple
+# projects and redirect the results back to the right project.
+# This tag requires that the tag SEARCHENGINE is set to YES.
+
+EXTERNAL_SEARCH_ID     =
+
+# The EXTRA_SEARCH_MAPPINGS tag can be used to enable searching through doxygen
+# projects other than the one defined by this configuration file, but that are
+# all added to the same external search index. Each project needs to have a
+# unique id set via EXTERNAL_SEARCH_ID. The search mapping then maps the id of
+# to a relative location where the documentation can be found. The format is:
+# EXTRA_SEARCH_MAPPINGS = tagname1=loc1 tagname2=loc2 ...
+# This tag requires that the tag SEARCHENGINE is set to YES.
+
+EXTRA_SEARCH_MAPPINGS  =
+
+#---------------------------------------------------------------------------
+# Configuration options related to the LaTeX output
+#---------------------------------------------------------------------------
+
+# If the GENERATE_LATEX tag is set to YES, doxygen will generate LaTeX output.
+# The default value is: YES.
+
+GENERATE_LATEX         = NO
+
+# The LATEX_OUTPUT tag is used to specify where the LaTeX docs will be put. If a
+# relative path is entered the value of OUTPUT_DIRECTORY will be put in front of
+# it.
+# The default directory is: latex.
+# This tag requires that the tag GENERATE_LATEX is set to YES.
+
+LATEX_OUTPUT           = latex
+
+# The LATEX_CMD_NAME tag can be used to specify the LaTeX command name to be
+# invoked.
+#
+# Note that when enabling USE_PDFLATEX this option is only used for generating
+# bitmaps for formulas in the HTML output, but not in the Makefile that is
+# written to the output directory.
+# The default file is: latex.
+# This tag requires that the tag GENERATE_LATEX is set to YES.
+
+LATEX_CMD_NAME         = latex
+
+# The MAKEINDEX_CMD_NAME tag can be used to specify the command name to generate
+# index for LaTeX.
+# The default file is: makeindex.
+# This tag requires that the tag GENERATE_LATEX is set to YES.
+
+MAKEINDEX_CMD_NAME     = makeindex
+
+# If the COMPACT_LATEX tag is set to YES, doxygen generates more compact LaTeX
+# documents. This may be useful for small projects and may help to save some
+# trees in general.
+# The default value is: NO.
+# This tag requires that the tag GENERATE_LATEX is set to YES.
+
+COMPACT_LATEX          = NO
+
+# The PAPER_TYPE tag can be used to set the paper type that is used by the
+# printer.
+# Possible values are: a4 (210 x 297 mm), letter (8.5 x 11 inches), legal (8.5 x
+# 14 inches) and executive (7.25 x 10.5 inches).
+# The default value is: a4.
+# This tag requires that the tag GENERATE_LATEX is set to YES.
+
+PAPER_TYPE             = a4
+
+# The EXTRA_PACKAGES tag can be used to specify one or more LaTeX package names
+# that should be included in the LaTeX output. To get the times font for
+# instance you can specify
+# EXTRA_PACKAGES=times
+# If left blank no extra packages will be included.
+# This tag requires that the tag GENERATE_LATEX is set to YES.
+
+EXTRA_PACKAGES         =
+
+# The LATEX_HEADER tag can be used to specify a personal LaTeX header for the
+# generated LaTeX document. The header should contain everything until the first
+# chapter. If it is left blank doxygen will generate a standard header. See
+# section "Doxygen usage" for information on how to let doxygen write the
+# default header to a separate file.
+#
+# Note: Only use a user-defined header if you know what you are doing! The
+# following commands have a special meaning inside the header: $title,
+# $datetime, $date, $doxygenversion, $projectname, $projectnumber,
+# $projectbrief, $projectlogo. Doxygen will replace $title with the empty
+# string, for the replacement values of the other commands the user is referred
+# to HTML_HEADER.
+# This tag requires that the tag GENERATE_LATEX is set to YES.
+
+LATEX_HEADER           =
+
+# The LATEX_FOOTER tag can be used to specify a personal LaTeX footer for the
+# generated LaTeX document. The footer should contain everything after the last
+# chapter. If it is left blank doxygen will generate a standard footer. See
+# LATEX_HEADER for more information on how to generate a default footer and what
+# special commands can be used inside the footer.
+#
+# Note: Only use a user-defined footer if you know what you are doing!
+# This tag requires that the tag GENERATE_LATEX is set to YES.
+
+LATEX_FOOTER           =
+
+# The LATEX_EXTRA_STYLESHEET tag can be used to specify additional user-defined
+# LaTeX style sheets that are included after the standard style sheets created
+# by doxygen. Using this option one can overrule certain style aspects. Doxygen
+# will copy the style sheet files to the output directory.
+# Note: The order of the extra style sheet files is of importance (e.g. the last
+# style sheet in the list overrules the setting of the previous ones in the
+# list).
+# This tag requires that the tag GENERATE_LATEX is set to YES.
+
+LATEX_EXTRA_STYLESHEET =
+
+# The LATEX_EXTRA_FILES tag can be used to specify one or more extra images or
+# other source files which should be copied to the LATEX_OUTPUT output
+# directory. Note that the files will be copied as-is; there are no commands or
+# markers available.
+# This tag requires that the tag GENERATE_LATEX is set to YES.
+
+LATEX_EXTRA_FILES      =
+
+# If the PDF_HYPERLINKS tag is set to YES, the LaTeX that is generated is
+# prepared for conversion to PDF (using ps2pdf or pdflatex). The PDF file will
+# contain links (just like the HTML output) instead of page references. This
+# makes the output suitable for online browsing using a PDF viewer.
+# The default value is: YES.
+# This tag requires that the tag GENERATE_LATEX is set to YES.
+
+PDF_HYPERLINKS         = YES
+
+# If the USE_PDFLATEX tag is set to YES, doxygen will use pdflatex to generate
+# the PDF file directly from the LaTeX files. Set this option to YES, to get a
+# higher quality PDF documentation.
+# The default value is: YES.
+# This tag requires that the tag GENERATE_LATEX is set to YES.
+
+USE_PDFLATEX           = YES
+
+# If the LATEX_BATCHMODE tag is set to YES, doxygen will add the \batchmode
+# command to the generated LaTeX files. This will instruct LaTeX to keep running
+# if errors occur, instead of asking the user for help. This option is also used
+# when generating formulas in HTML.
+# The default value is: NO.
+# This tag requires that the tag GENERATE_LATEX is set to YES.
+
+LATEX_BATCHMODE        = NO
+
+# If the LATEX_HIDE_INDICES tag is set to YES then doxygen will not include the
+# index chapters (such as File Index, Compound Index, etc.) in the output.
+# The default value is: NO.
+# This tag requires that the tag GENERATE_LATEX is set to YES.
+
+LATEX_HIDE_INDICES     = NO
+
+# If the LATEX_SOURCE_CODE tag is set to YES then doxygen will include source
+# code with syntax highlighting in the LaTeX output.
+#
+# Note that which sources are shown also depends on other settings such as
+# SOURCE_BROWSER.
+# The default value is: NO.
+# This tag requires that the tag GENERATE_LATEX is set to YES.
+
+LATEX_SOURCE_CODE      = NO
+
+# The LATEX_BIB_STYLE tag can be used to specify the style to use for the
+# bibliography, e.g. plainnat, or ieeetr. See
+# http://en.wikipedia.org/wiki/BibTeX and \cite for more info.
+# The default value is: plain.
+# This tag requires that the tag GENERATE_LATEX is set to YES.
+
+LATEX_BIB_STYLE        = plain
+
+#---------------------------------------------------------------------------
+# Configuration options related to the RTF output
+#---------------------------------------------------------------------------
+
+# If the GENERATE_RTF tag is set to YES, doxygen will generate RTF output. The
+# RTF output is optimized for Word 97 and may not look too pretty with other RTF
+# readers/editors.
+# The default value is: NO.
+
+GENERATE_RTF           = NO
+
+# The RTF_OUTPUT tag is used to specify where the RTF docs will be put. If a
+# relative path is entered the value of OUTPUT_DIRECTORY will be put in front of
+# it.
+# The default directory is: rtf.
+# This tag requires that the tag GENERATE_RTF is set to YES.
+
+RTF_OUTPUT             = rtf
+
+# If the COMPACT_RTF tag is set to YES, doxygen generates more compact RTF
+# documents. This may be useful for small projects and may help to save some
+# trees in general.
+# The default value is: NO.
+# This tag requires that the tag GENERATE_RTF is set to YES.
+
+COMPACT_RTF            = NO
+
+# If the RTF_HYPERLINKS tag is set to YES, the RTF that is generated will
+# contain hyperlink fields. The RTF file will contain links (just like the HTML
+# output) instead of page references. This makes the output suitable for online
+# browsing using Word or some other Word compatible readers that support those
+# fields.
+#
+# Note: WordPad (write) and others do not support links.
+# The default value is: NO.
+# This tag requires that the tag GENERATE_RTF is set to YES.
+
+RTF_HYPERLINKS         = NO
+
+# Load stylesheet definitions from file. Syntax is similar to doxygen's config
+# file, i.e. a series of assignments. You only have to provide replacements,
+# missing definitions are set to their default value.
+#
+# See also section "Doxygen usage" for information on how to generate the
+# default style sheet that doxygen normally uses.
+# This tag requires that the tag GENERATE_RTF is set to YES.
+
+RTF_STYLESHEET_FILE    =
+
+# Set optional variables used in the generation of an RTF document. Syntax is
+# similar to doxygen's config file. A template extensions file can be generated
+# using doxygen -e rtf extensionFile.
+# This tag requires that the tag GENERATE_RTF is set to YES.
+
+RTF_EXTENSIONS_FILE    =
+
+# If the RTF_SOURCE_CODE tag is set to YES then doxygen will include source code
+# with syntax highlighting in the RTF output.
+#
+# Note that which sources are shown also depends on other settings such as
+# SOURCE_BROWSER.
+# The default value is: NO.
+# This tag requires that the tag GENERATE_RTF is set to YES.
+
+RTF_SOURCE_CODE        = NO
+
+#---------------------------------------------------------------------------
+# Configuration options related to the man page output
+#---------------------------------------------------------------------------
+
+# If the GENERATE_MAN tag is set to YES, doxygen will generate man pages for
+# classes and files.
+# The default value is: NO.
+
+GENERATE_MAN           = NO
+
+# The MAN_OUTPUT tag is used to specify where the man pages will be put. If a
+# relative path is entered the value of OUTPUT_DIRECTORY will be put in front of
+# it. A directory man3 will be created inside the directory specified by
+# MAN_OUTPUT.
+# The default directory is: man.
+# This tag requires that the tag GENERATE_MAN is set to YES.
+
+MAN_OUTPUT             = man
+
+# The MAN_EXTENSION tag determines the extension that is added to the generated
+# man pages. In case the manual section does not start with a number, the number
+# 3 is prepended. The dot (.) at the beginning of the MAN_EXTENSION tag is
+# optional.
+# The default value is: .3.
+# This tag requires that the tag GENERATE_MAN is set to YES.
+
+MAN_EXTENSION          = .3
+
+# The MAN_SUBDIR tag determines the name of the directory created within
+# MAN_OUTPUT in which the man pages are placed. If defaults to man followed by
+# MAN_EXTENSION with the initial . removed.
+# This tag requires that the tag GENERATE_MAN is set to YES.
+
+MAN_SUBDIR             =
+
+# If the MAN_LINKS tag is set to YES and doxygen generates man output, then it
+# will generate one additional man file for each entity documented in the real
+# man page(s). These additional files only source the real man page, but without
+# them the man command would be unable to find the correct page.
+# The default value is: NO.
+# This tag requires that the tag GENERATE_MAN is set to YES.
+
+MAN_LINKS              = NO
+
+#---------------------------------------------------------------------------
+# Configuration options related to the XML output
+#---------------------------------------------------------------------------
+
+# If the GENERATE_XML tag is set to YES, doxygen will generate an XML file that
+# captures the structure of the code including all documentation.
+# The default value is: NO.
+
+GENERATE_XML           = NO
+
+# The XML_OUTPUT tag is used to specify where the XML pages will be put. If a
+# relative path is entered the value of OUTPUT_DIRECTORY will be put in front of
+# it.
+# The default directory is: xml.
+# This tag requires that the tag GENERATE_XML is set to YES.
+
+XML_OUTPUT             = xml
+
+# If the XML_PROGRAMLISTING tag is set to YES, doxygen will dump the program
+# listings (including syntax highlighting and cross-referencing information) to
+# the XML output. Note that enabling this will significantly increase the size
+# of the XML output.
+# The default value is: YES.
+# This tag requires that the tag GENERATE_XML is set to YES.
+
+XML_PROGRAMLISTING     = YES
+
+#---------------------------------------------------------------------------
+# Configuration options related to the DOCBOOK output
+#---------------------------------------------------------------------------
+
+# If the GENERATE_DOCBOOK tag is set to YES, doxygen will generate Docbook files
+# that can be used to generate PDF.
+# The default value is: NO.
+
+GENERATE_DOCBOOK       = NO
+
+# The DOCBOOK_OUTPUT tag is used to specify where the Docbook pages will be put.
+# If a relative path is entered the value of OUTPUT_DIRECTORY will be put in
+# front of it.
+# The default directory is: docbook.
+# This tag requires that the tag GENERATE_DOCBOOK is set to YES.
+
+DOCBOOK_OUTPUT         = docbook
+
+# If the DOCBOOK_PROGRAMLISTING tag is set to YES, doxygen will include the
+# program listings (including syntax highlighting and cross-referencing
+# information) to the DOCBOOK output. Note that enabling this will significantly
+# increase the size of the DOCBOOK output.
+# The default value is: NO.
+# This tag requires that the tag GENERATE_DOCBOOK is set to YES.
+
+DOCBOOK_PROGRAMLISTING = NO
+
+#---------------------------------------------------------------------------
+# Configuration options for the AutoGen Definitions output
+#---------------------------------------------------------------------------
+
+# If the GENERATE_AUTOGEN_DEF tag is set to YES, doxygen will generate an
+# AutoGen Definitions (see http://autogen.sf.net) file that captures the
+# structure of the code including all documentation. Note that this feature is
+# still experimental and incomplete at the moment.
+# The default value is: NO.
+
+GENERATE_AUTOGEN_DEF   = NO
+
+#---------------------------------------------------------------------------
+# Configuration options related to the Perl module output
+#---------------------------------------------------------------------------
+
+# If the GENERATE_PERLMOD tag is set to YES, doxygen will generate a Perl module
+# file that captures the structure of the code including all documentation.
+#
+# Note that this feature is still experimental and incomplete at the moment.
+# The default value is: NO.
+
+GENERATE_PERLMOD       = NO
+
+# If the PERLMOD_LATEX tag is set to YES, doxygen will generate the necessary
+# Makefile rules, Perl scripts and LaTeX code to be able to generate PDF and DVI
+# output from the Perl module output.
+# The default value is: NO.
+# This tag requires that the tag GENERATE_PERLMOD is set to YES.
+
+PERLMOD_LATEX          = NO
+
+# If the PERLMOD_PRETTY tag is set to YES, the Perl module output will be nicely
+# formatted so it can be parsed by a human reader. This is useful if you want to
+# understand what is going on. On the other hand, if this tag is set to NO, the
+# size of the Perl module output will be much smaller and Perl will parse it
+# just the same.
+# The default value is: YES.
+# This tag requires that the tag GENERATE_PERLMOD is set to YES.
+
+PERLMOD_PRETTY         = YES
+
+# The names of the make variables in the generated doxyrules.make file are
+# prefixed with the string contained in PERLMOD_MAKEVAR_PREFIX. This is useful
+# so different doxyrules.make files included by the same Makefile don't
+# overwrite each other's variables.
+# This tag requires that the tag GENERATE_PERLMOD is set to YES.
+
+PERLMOD_MAKEVAR_PREFIX =
+
+#---------------------------------------------------------------------------
+# Configuration options related to the preprocessor
+#---------------------------------------------------------------------------
+
+# If the ENABLE_PREPROCESSING tag is set to YES, doxygen will evaluate all
+# C-preprocessor directives found in the sources and include files.
+# The default value is: YES.
+
+ENABLE_PREPROCESSING   = YES
+
+# If the MACRO_EXPANSION tag is set to YES, doxygen will expand all macro names
+# in the source code. If set to NO, only conditional compilation will be
+# performed. Macro expansion can be done in a controlled way by setting
+# EXPAND_ONLY_PREDEF to YES.
+# The default value is: NO.
+# This tag requires that the tag ENABLE_PREPROCESSING is set to YES.
+
+MACRO_EXPANSION        = YES
+
+# If the EXPAND_ONLY_PREDEF and MACRO_EXPANSION tags are both set to YES then
+# the macro expansion is limited to the macros specified with the PREDEFINED and
+# EXPAND_AS_DEFINED tags.
+# The default value is: NO.
+# This tag requires that the tag ENABLE_PREPROCESSING is set to YES.
+
+EXPAND_ONLY_PREDEF     = NO
+
+# If the SEARCH_INCLUDES tag is set to YES, the include files in the
+# INCLUDE_PATH will be searched if a #include is found.
+# The default value is: YES.
+# This tag requires that the tag ENABLE_PREPROCESSING is set to YES.
+
+SEARCH_INCLUDES        = YES
+
+# The INCLUDE_PATH tag can be used to specify one or more directories that
+# contain include files that are not input files but should be processed by the
+# preprocessor.
+# This tag requires that the tag SEARCH_INCLUDES is set to YES.
+
+INCLUDE_PATH           =
+
+# You can use the INCLUDE_FILE_PATTERNS tag to specify one or more wildcard
+# patterns (like *.h and *.hpp) to filter out the header-files in the
+# directories. If left blank, the patterns specified with FILE_PATTERNS will be
+# used.
+# This tag requires that the tag ENABLE_PREPROCESSING is set to YES.
+
+INCLUDE_FILE_PATTERNS  =
+
+# The PREDEFINED tag can be used to specify one or more macro names that are
+# defined before the preprocessor is started (similar to the -D option of e.g.
+# gcc). The argument of the tag is a list of macros of the form: name or
+# name=definition (no spaces). If the definition and the "=" are omitted, "=1"
+# is assumed. To prevent a macro definition from being undefined via #undef or
+# recursively expanded use the := operator instead of the = operator.
+# This tag requires that the tag ENABLE_PREPROCESSING is set to YES.
+
+PREDEFINED             = GRPC_FINAL= GRPC_OVERIDE=
+
+# If the MACRO_EXPANSION and EXPAND_ONLY_PREDEF tags are set to YES then this
+# tag can be used to specify a list of macro names that should be expanded. The
+# macro definition that is found in the sources will be used. Use the PREDEFINED
+# tag if you want to use a different macro definition that overrules the
+# definition found in the source code.
+# This tag requires that the tag ENABLE_PREPROCESSING is set to YES.
+
+EXPAND_AS_DEFINED      =
+
+# If the SKIP_FUNCTION_MACROS tag is set to YES then doxygen's preprocessor will
+# remove all references to function-like macros that are alone on a line, have
+# an all uppercase name, and do not end with a semicolon. Such function macros
+# are typically used for boiler-plate code, and will confuse the parser if not
+# removed.
+# The default value is: YES.
+# This tag requires that the tag ENABLE_PREPROCESSING is set to YES.
+
+SKIP_FUNCTION_MACROS   = YES
+
+#---------------------------------------------------------------------------
+# Configuration options related to external references
+#---------------------------------------------------------------------------
+
+# The TAGFILES tag can be used to specify one or more tag files. For each tag
+# file the location of the external documentation should be added. The format of
+# a tag file without this location is as follows:
+# TAGFILES = file1 file2 ...
+# Adding location for the tag files is done as follows:
+# TAGFILES = file1=loc1 "file2 = loc2" ...
+# where loc1 and loc2 can be relative or absolute paths or URLs. See the
+# section "Linking to external documentation" for more information about the use
+# of tag files.
+# Note: Each tag file must have a unique name (where the name does NOT include
+# the path). If a tag file is not located in the directory in which doxygen is
+# run, you must also specify the path to the tagfile here.
+
+TAGFILES               =
+
+# When a file name is specified after GENERATE_TAGFILE, doxygen will create a
+# tag file that is based on the input files it reads. See section "Linking to
+# external documentation" for more information about the usage of tag files.
+
+GENERATE_TAGFILE       =
+
+# If the ALLEXTERNALS tag is set to YES, all external class will be listed in
+# the class index. If set to NO, only the inherited external classes will be
+# listed.
+# The default value is: NO.
+
+ALLEXTERNALS           = NO
+
+# If the EXTERNAL_GROUPS tag is set to YES, all external groups will be listed
+# in the modules index. If set to NO, only the current project's groups will be
+# listed.
+# The default value is: YES.
+
+EXTERNAL_GROUPS        = YES
+
+# If the EXTERNAL_PAGES tag is set to YES, all external pages will be listed in
+# the related pages index. If set to NO, only the current project's pages will
+# be listed.
+# The default value is: YES.
+
+EXTERNAL_PAGES         = YES
+
+# The PERL_PATH should be the absolute path and name of the perl script
+# interpreter (i.e. the result of 'which perl').
+# The default file (with absolute path) is: /usr/bin/perl.
+
+PERL_PATH              = /usr/bin/perl
+
+#---------------------------------------------------------------------------
+# Configuration options related to the dot tool
+#---------------------------------------------------------------------------
+
+# If the CLASS_DIAGRAMS tag is set to YES, doxygen will generate a class diagram
+# (in HTML and LaTeX) for classes with base or super classes. Setting the tag to
+# NO turns the diagrams off. Note that this option also works with HAVE_DOT
+# disabled, but it is recommended to install and use dot, since it yields more
+# powerful graphs.
+# The default value is: YES.
+
+CLASS_DIAGRAMS         = YES
+
+# You can define message sequence charts within doxygen comments using the \msc
+# command. Doxygen will then run the mscgen tool (see:
+# http://www.mcternan.me.uk/mscgen/)) to produce the chart and insert it in the
+# documentation. The MSCGEN_PATH tag allows you to specify the directory where
+# the mscgen tool resides. If left empty the tool is assumed to be found in the
+# default search path.
+
+MSCGEN_PATH            =
+
+# You can include diagrams made with dia in doxygen documentation. Doxygen will
+# then run dia to produce the diagram and insert it in the documentation. The
+# DIA_PATH tag allows you to specify the directory where the dia binary resides.
+# If left empty dia is assumed to be found in the default search path.
+
+DIA_PATH               =
+
+# If set to YES the inheritance and collaboration graphs will hide inheritance
+# and usage relations if the target is undocumented or is not a class.
+# The default value is: YES.
+
+HIDE_UNDOC_RELATIONS   = YES
+
+# If you set the HAVE_DOT tag to YES then doxygen will assume the dot tool is
+# available from the path. This tool is part of Graphviz (see:
+# http://www.graphviz.org/), a graph visualization toolkit from AT&T and Lucent
+# Bell Labs. The other options in this section have no effect if this option is
+# set to NO
+# The default value is: NO.
+
+HAVE_DOT               = YES
+
+# The DOT_NUM_THREADS specifies the number of dot invocations doxygen is allowed
+# to run in parallel. When set to 0 doxygen will base this on the number of
+# processors available in the system. You can set it explicitly to a value
+# larger than 0 to get control over the balance between CPU load and processing
+# speed.
+# Minimum value: 0, maximum value: 32, default value: 0.
+# This tag requires that the tag HAVE_DOT is set to YES.
+
+DOT_NUM_THREADS        = 0
+
+# When you want a differently looking font in the dot files that doxygen
+# generates you can specify the font name using DOT_FONTNAME. You need to make
+# sure dot is able to find the font, which can be done by putting it in a
+# standard location or by setting the DOTFONTPATH environment variable or by
+# setting DOT_FONTPATH to the directory containing the font.
+# The default value is: Helvetica.
+# This tag requires that the tag HAVE_DOT is set to YES.
+
+DOT_FONTNAME           = Helvetica
+
+# The DOT_FONTSIZE tag can be used to set the size (in points) of the font of
+# dot graphs.
+# Minimum value: 4, maximum value: 24, default value: 10.
+# This tag requires that the tag HAVE_DOT is set to YES.
+
+DOT_FONTSIZE           = 10
+
+# By default doxygen will tell dot to use the default font as specified with
+# DOT_FONTNAME. If you specify a different font using DOT_FONTNAME you can set
+# the path where dot can find it using this tag.
+# This tag requires that the tag HAVE_DOT is set to YES.
+
+DOT_FONTPATH           =
+
+# If the CLASS_GRAPH tag is set to YES then doxygen will generate a graph for
+# each documented class showing the direct and indirect inheritance relations.
+# Setting this tag to YES will force the CLASS_DIAGRAMS tag to NO.
+# The default value is: YES.
+# This tag requires that the tag HAVE_DOT is set to YES.
+
+CLASS_GRAPH            = NO
+
+# If the COLLABORATION_GRAPH tag is set to YES then doxygen will generate a
+# graph for each documented class showing the direct and indirect implementation
+# dependencies (inheritance, containment, and class references variables) of the
+# class with other documented classes.
+# The default value is: YES.
+# This tag requires that the tag HAVE_DOT is set to YES.
+
+COLLABORATION_GRAPH    = NO
+
+# If the GROUP_GRAPHS tag is set to YES then doxygen will generate a graph for
+# groups, showing the direct groups dependencies.
+# The default value is: YES.
+# This tag requires that the tag HAVE_DOT is set to YES.
+
+GROUP_GRAPHS           = NO
+
+# If the UML_LOOK tag is set to YES, doxygen will generate inheritance and
+# collaboration diagrams in a style similar to the OMG's Unified Modeling
+# Language.
+# The default value is: NO.
+# This tag requires that the tag HAVE_DOT is set to YES.
+
+UML_LOOK               = NO
+
+# If the UML_LOOK tag is enabled, the fields and methods are shown inside the
+# class node. If there are many fields or methods and many nodes the graph may
+# become too big to be useful. The UML_LIMIT_NUM_FIELDS threshold limits the
+# number of items for each type to make the size more manageable. Set this to 0
+# for no limit. Note that the threshold may be exceeded by 50% before the limit
+# is enforced. So when you set the threshold to 10, up to 15 fields may appear,
+# but if the number exceeds 15, the total amount of fields shown is limited to
+# 10.
+# Minimum value: 0, maximum value: 100, default value: 10.
+# This tag requires that the tag HAVE_DOT is set to YES.
+
+UML_LIMIT_NUM_FIELDS   = 10
+
+# If the TEMPLATE_RELATIONS tag is set to YES then the inheritance and
+# collaboration graphs will show the relations between templates and their
+# instances.
+# The default value is: NO.
+# This tag requires that the tag HAVE_DOT is set to YES.
+
+TEMPLATE_RELATIONS     = NO
+
+# If the INCLUDE_GRAPH, ENABLE_PREPROCESSING and SEARCH_INCLUDES tags are set to
+# YES then doxygen will generate a graph for each documented file showing the
+# direct and indirect include dependencies of the file with other documented
+# files.
+# The default value is: YES.
+# This tag requires that the tag HAVE_DOT is set to YES.
+
+INCLUDE_GRAPH          = NO
+
+# If the INCLUDED_BY_GRAPH, ENABLE_PREPROCESSING and SEARCH_INCLUDES tags are
+# set to YES then doxygen will generate a graph for each documented file showing
+# the direct and indirect include dependencies of the file with other documented
+# files.
+# The default value is: YES.
+# This tag requires that the tag HAVE_DOT is set to YES.
+
+INCLUDED_BY_GRAPH      = NO
+
+# If the CALL_GRAPH tag is set to YES then doxygen will generate a call
+# dependency graph for every global function or class method.
+#
+# Note that enabling this option will significantly increase the time of a run.
+# So in most cases it will be better to enable call graphs for selected
+# functions only using the \callgraph command.
+# The default value is: NO.
+# This tag requires that the tag HAVE_DOT is set to YES.
+
+CALL_GRAPH             = NO
+
+# If the CALLER_GRAPH tag is set to YES then doxygen will generate a caller
+# dependency graph for every global function or class method.
+#
+# Note that enabling this option will significantly increase the time of a run.
+# So in most cases it will be better to enable caller graphs for selected
+# functions only using the \callergraph command.
+# The default value is: NO.
+# This tag requires that the tag HAVE_DOT is set to YES.
+
+CALLER_GRAPH           = NO
+
+# If the GRAPHICAL_HIERARCHY tag is set to YES then doxygen will graphical
+# hierarchy of all classes instead of a textual one.
+# The default value is: YES.
+# This tag requires that the tag HAVE_DOT is set to YES.
+
+GRAPHICAL_HIERARCHY    = NO
+
+# If the DIRECTORY_GRAPH tag is set to YES then doxygen will show the
+# dependencies a directory has on other directories in a graphical way. The
+# dependency relations are determined by the #include relations between the
+# files in the directories.
+# The default value is: YES.
+# This tag requires that the tag HAVE_DOT is set to YES.
+
+DIRECTORY_GRAPH        = NO
+
+# The DOT_IMAGE_FORMAT tag can be used to set the image format of the images
+# generated by dot.
+# Note: If you choose svg you need to set HTML_FILE_EXTENSION to xhtml in order
+# to make the SVG files visible in IE 9+ (other browsers do not have this
+# requirement).
+# Possible values are: png, jpg, gif and svg.
+# The default value is: png.
+# This tag requires that the tag HAVE_DOT is set to YES.
+
+DOT_IMAGE_FORMAT       = png
+
+# If DOT_IMAGE_FORMAT is set to svg, then this option can be set to YES to
+# enable generation of interactive SVG images that allow zooming and panning.
+#
+# Note that this requires a modern browser other than Internet Explorer. Tested
+# and working are Firefox, Chrome, Safari, and Opera.
+# Note: For IE 9+ you need to set HTML_FILE_EXTENSION to xhtml in order to make
+# the SVG files visible. Older versions of IE do not have SVG support.
+# The default value is: NO.
+# This tag requires that the tag HAVE_DOT is set to YES.
+
+INTERACTIVE_SVG        = NO
+
+# The DOT_PATH tag can be used to specify the path where the dot tool can be
+# found. If left blank, it is assumed the dot tool can be found in the path.
+# This tag requires that the tag HAVE_DOT is set to YES.
+
+DOT_PATH               =
+
+# The DOTFILE_DIRS tag can be used to specify one or more directories that
+# contain dot files that are included in the documentation (see the \dotfile
+# command).
+# This tag requires that the tag HAVE_DOT is set to YES.
+
+DOTFILE_DIRS           =
+
+# The MSCFILE_DIRS tag can be used to specify one or more directories that
+# contain msc files that are included in the documentation (see the \mscfile
+# command).
+
+MSCFILE_DIRS           =
+
+# The DIAFILE_DIRS tag can be used to specify one or more directories that
+# contain dia files that are included in the documentation (see the \diafile
+# command).
+
+DIAFILE_DIRS           =
+
+# When using plantuml, the PLANTUML_JAR_PATH tag should be used to specify the
+# path where java can find the plantuml.jar file. If left blank, it is assumed
+# PlantUML is not used or called during a preprocessing step. Doxygen will
+# generate a warning when it encounters a \startuml command in this case and
+# will not generate output for the diagram.
+
+PLANTUML_JAR_PATH      =
+
+# When using plantuml, the specified paths are searched for files specified by
+# the !include statement in a plantuml block.
+
+PLANTUML_INCLUDE_PATH  =
+
+# The DOT_GRAPH_MAX_NODES tag can be used to set the maximum number of nodes
+# that will be shown in the graph. If the number of nodes in a graph becomes
+# larger than this value, doxygen will truncate the graph, which is visualized
+# by representing a node as a red box. Note that doxygen if the number of direct
+# children of the root node in a graph is already larger than
+# DOT_GRAPH_MAX_NODES then the graph will not be shown at all. Also note that
+# the size of a graph can be further restricted by MAX_DOT_GRAPH_DEPTH.
+# Minimum value: 0, maximum value: 10000, default value: 50.
+# This tag requires that the tag HAVE_DOT is set to YES.
+
+DOT_GRAPH_MAX_NODES    = 50
+
+# The MAX_DOT_GRAPH_DEPTH tag can be used to set the maximum depth of the graphs
+# generated by dot. A depth value of 3 means that only nodes reachable from the
+# root by following a path via at most 3 edges will be shown. Nodes that lay
+# further from the root node will be omitted. Note that setting this option to 1
+# or 2 may greatly reduce the computation time needed for large code bases. Also
+# note that the size of a graph can be further restricted by
+# DOT_GRAPH_MAX_NODES. Using a depth of 0 means no depth restriction.
+# Minimum value: 0, maximum value: 1000, default value: 0.
+# This tag requires that the tag HAVE_DOT is set to YES.
+
+MAX_DOT_GRAPH_DEPTH    = 0
+
+# Set the DOT_TRANSPARENT tag to YES to generate images with a transparent
+# background. This is disabled by default, because dot on Windows does not seem
+# to support this out of the box.
+#
+# Warning: Depending on the platform used, enabling this option may lead to
+# badly anti-aliased labels on the edges of a graph (i.e. they become hard to
+# read).
+# The default value is: NO.
+# This tag requires that the tag HAVE_DOT is set to YES.
+
+DOT_TRANSPARENT        = NO
+
+# Set the DOT_MULTI_TARGETS tag to YES to allow dot to generate multiple output
+# files in one run (i.e. multiple -o and -T options on the command line). This
+# makes dot run faster, but since only newer versions of dot (>1.8.10) support
+# this, this feature is disabled by default.
+# The default value is: NO.
+# This tag requires that the tag HAVE_DOT is set to YES.
+
+DOT_MULTI_TARGETS      = NO
+
+# If the GENERATE_LEGEND tag is set to YES doxygen will generate a legend page
+# explaining the meaning of the various boxes and arrows in the dot generated
+# graphs.
+# The default value is: YES.
+# This tag requires that the tag HAVE_DOT is set to YES.
+
+GENERATE_LEGEND        = YES
+
+# If the DOT_CLEANUP tag is set to YES, doxygen will remove the intermediate dot
+# files that are used to generate the various graphs.
+# The default value is: YES.
+# This tag requires that the tag HAVE_DOT is set to YES.
+
+DOT_CLEANUP            = YES
+
diff --git a/tools/run_tests/performance/scenario_config.py b/tools/run_tests/performance/scenario_config.py
index b55d728..2d5130e 100644
--- a/tools/run_tests/performance/scenario_config.py
+++ b/tools/run_tests/performance/scenario_config.py
@@ -395,8 +395,8 @@
     #    categories=[SMOKETEST])
 
     yield _ping_pong_scenario(
-        'python_protobuf_async_streaming_ping_pong', rpc_type='STREAMING',
-        client_type='ASYNC_CLIENT', server_type='SYNC_SERVER')
+        'python_protobuf_sync_streaming_ping_pong', rpc_type='STREAMING',
+        client_type='SYNC_CLIENT', server_type='SYNC_SERVER')
 
     yield _ping_pong_scenario(
         'python_protobuf_async_unary_ping_pong', rpc_type='UNARY',
@@ -413,9 +413,9 @@
         unconstrained_client='sync')
 
     yield _ping_pong_scenario(
-        'python_protobuf_async_streaming_qps_unconstrained', rpc_type='STREAMING',
-        client_type='ASYNC_CLIENT', server_type='SYNC_SERVER',
-        unconstrained_client='async')
+        'python_protobuf_sync_streaming_qps_unconstrained', rpc_type='STREAMING',
+        client_type='SYNC_CLIENT', server_type='SYNC_SERVER',
+        unconstrained_client='sync')
 
     yield _ping_pong_scenario(
         'python_to_cpp_protobuf_sync_unary_ping_pong', rpc_type='UNARY',
diff --git a/tools/run_tests/run_interop_tests.py b/tools/run_tests/run_interop_tests.py
index 053aabc..5aaefb1 100755
--- a/tools/run_tests/run_interop_tests.py
+++ b/tools/run_tests/run_interop_tests.py
@@ -317,7 +317,7 @@
             'PYTHONPATH': '{}/src/python/gens'.format(DOCKER_WORKDIR_ROOT)}
 
   def unimplemented_test_cases(self):
-    return _SKIP_ADVANCED + _SKIP_COMPRESSION + ['jwt_token_creds']
+    return _SKIP_ADVANCED + _SKIP_COMPRESSION
 
   def unimplemented_test_cases_server(self):
     return _SKIP_ADVANCED + _SKIP_COMPRESSION
diff --git a/tools/run_tests/sources_and_headers.json b/tools/run_tests/sources_and_headers.json
index e23c1cb..325aca1 100644
--- a/tools/run_tests/sources_and_headers.json
+++ b/tools/run_tests/sources_and_headers.json
@@ -4261,18 +4261,18 @@
       "grpc++_codegen_base_src"
     ], 
     "headers": [
+      "include/grpc++/impl/codegen/core_codegen.h", 
       "src/cpp/client/secure_credentials.h", 
-      "src/cpp/common/core_codegen.h", 
       "src/cpp/common/secure_auth_context.h", 
       "src/cpp/server/secure_server_credentials.h"
     ], 
     "language": "c++", 
     "name": "grpc++", 
     "src": [
+      "include/grpc++/impl/codegen/core_codegen.h", 
       "src/cpp/client/secure_credentials.cc", 
       "src/cpp/client/secure_credentials.h", 
       "src/cpp/common/auth_property_iterator.cc", 
-      "src/cpp/common/core_codegen.h", 
       "src/cpp/common/secure_auth_context.cc", 
       "src/cpp/common/secure_auth_context.h", 
       "src/cpp/common/secure_channel_arguments.cc", 
@@ -6402,6 +6402,7 @@
       "include/grpc++/grpc++.h", 
       "include/grpc++/impl/call.h", 
       "include/grpc++/impl/client_unary_call.h", 
+      "include/grpc++/impl/codegen/core_codegen.h", 
       "include/grpc++/impl/grpc_library.h", 
       "include/grpc++/impl/method_handler_impl.h", 
       "include/grpc++/impl/rpc_method.h", 
@@ -6437,7 +6438,6 @@
       "include/grpc++/support/sync_stream.h", 
       "include/grpc++/support/time.h", 
       "src/cpp/client/create_channel_internal.h", 
-      "src/cpp/common/core_codegen.h", 
       "src/cpp/server/dynamic_thread_pool.h", 
       "src/cpp/server/thread_pool_interface.h"
     ], 
@@ -6454,6 +6454,7 @@
       "include/grpc++/grpc++.h", 
       "include/grpc++/impl/call.h", 
       "include/grpc++/impl/client_unary_call.h", 
+      "include/grpc++/impl/codegen/core_codegen.h", 
       "include/grpc++/impl/grpc_library.h", 
       "include/grpc++/impl/method_handler_impl.h", 
       "include/grpc++/impl/rpc_method.h", 
@@ -6499,7 +6500,6 @@
       "src/cpp/common/channel_arguments.cc", 
       "src/cpp/common/completion_queue.cc", 
       "src/cpp/common/core_codegen.cc", 
-      "src/cpp/common/core_codegen.h", 
       "src/cpp/common/rpc_method.cc", 
       "src/cpp/server/async_generic_service.cc", 
       "src/cpp/server/create_default_thread_pool.cc", 
diff --git a/vsprojects/vcxproj/grpc++/grpc++.vcxproj b/vsprojects/vcxproj/grpc++/grpc++.vcxproj
index 660d14a..95c7f71 100644
--- a/vsprojects/vcxproj/grpc++/grpc++.vcxproj
+++ b/vsprojects/vcxproj/grpc++/grpc++.vcxproj
@@ -268,6 +268,7 @@
     <ClInclude Include="$(SolutionDir)\..\include\grpc++\grpc++.h" />
     <ClInclude Include="$(SolutionDir)\..\include\grpc++\impl\call.h" />
     <ClInclude Include="$(SolutionDir)\..\include\grpc++\impl\client_unary_call.h" />
+    <ClInclude Include="$(SolutionDir)\..\include\grpc++\impl\codegen\core_codegen.h" />
     <ClInclude Include="$(SolutionDir)\..\include\grpc++\impl\grpc_library.h" />
     <ClInclude Include="$(SolutionDir)\..\include\grpc++\impl\method_handler_impl.h" />
     <ClInclude Include="$(SolutionDir)\..\include\grpc++\impl\rpc_method.h" />
@@ -355,8 +356,8 @@
     <ClInclude Include="$(SolutionDir)\..\include\grpc\impl\codegen\time.h" />
   </ItemGroup>
   <ItemGroup>
+    <ClInclude Include="$(SolutionDir)\..\include\grpc++\impl\codegen\core_codegen.h" />
     <ClInclude Include="$(SolutionDir)\..\src\cpp\client\secure_credentials.h" />
-    <ClInclude Include="$(SolutionDir)\..\src\cpp\common\core_codegen.h" />
     <ClInclude Include="$(SolutionDir)\..\src\cpp\common\secure_auth_context.h" />
     <ClInclude Include="$(SolutionDir)\..\src\cpp\server\secure_server_credentials.h" />
     <ClInclude Include="$(SolutionDir)\..\src\cpp\client\create_channel_internal.h" />
diff --git a/vsprojects/vcxproj/grpc++/grpc++.vcxproj.filters b/vsprojects/vcxproj/grpc++/grpc++.vcxproj.filters
index 6cca360..89d1b34 100644
--- a/vsprojects/vcxproj/grpc++/grpc++.vcxproj.filters
+++ b/vsprojects/vcxproj/grpc++/grpc++.vcxproj.filters
@@ -126,6 +126,9 @@
     <ClInclude Include="$(SolutionDir)\..\include\grpc++\impl\client_unary_call.h">
       <Filter>include\grpc++\impl</Filter>
     </ClInclude>
+    <ClInclude Include="$(SolutionDir)\..\include\grpc++\impl\codegen\core_codegen.h">
+      <Filter>include\grpc++\impl\codegen</Filter>
+    </ClInclude>
     <ClInclude Include="$(SolutionDir)\..\include\grpc++\impl\grpc_library.h">
       <Filter>include\grpc++\impl</Filter>
     </ClInclude>
@@ -383,12 +386,12 @@
     </ClInclude>
   </ItemGroup>
   <ItemGroup>
+    <ClInclude Include="$(SolutionDir)\..\include\grpc++\impl\codegen\core_codegen.h">
+      <Filter>include\grpc++\impl\codegen</Filter>
+    </ClInclude>
     <ClInclude Include="$(SolutionDir)\..\src\cpp\client\secure_credentials.h">
       <Filter>src\cpp\client</Filter>
     </ClInclude>
-    <ClInclude Include="$(SolutionDir)\..\src\cpp\common\core_codegen.h">
-      <Filter>src\cpp\common</Filter>
-    </ClInclude>
     <ClInclude Include="$(SolutionDir)\..\src\cpp\common\secure_auth_context.h">
       <Filter>src\cpp\common</Filter>
     </ClInclude>
diff --git a/vsprojects/vcxproj/grpc++_unsecure/grpc++_unsecure.vcxproj b/vsprojects/vcxproj/grpc++_unsecure/grpc++_unsecure.vcxproj
index abf6efb..6a96ec8 100644
--- a/vsprojects/vcxproj/grpc++_unsecure/grpc++_unsecure.vcxproj
+++ b/vsprojects/vcxproj/grpc++_unsecure/grpc++_unsecure.vcxproj
@@ -268,6 +268,7 @@
     <ClInclude Include="$(SolutionDir)\..\include\grpc++\grpc++.h" />
     <ClInclude Include="$(SolutionDir)\..\include\grpc++\impl\call.h" />
     <ClInclude Include="$(SolutionDir)\..\include\grpc++\impl\client_unary_call.h" />
+    <ClInclude Include="$(SolutionDir)\..\include\grpc++\impl\codegen\core_codegen.h" />
     <ClInclude Include="$(SolutionDir)\..\include\grpc++\impl\grpc_library.h" />
     <ClInclude Include="$(SolutionDir)\..\include\grpc++\impl\method_handler_impl.h" />
     <ClInclude Include="$(SolutionDir)\..\include\grpc++\impl\rpc_method.h" />
@@ -356,7 +357,6 @@
   </ItemGroup>
   <ItemGroup>
     <ClInclude Include="$(SolutionDir)\..\src\cpp\client\create_channel_internal.h" />
-    <ClInclude Include="$(SolutionDir)\..\src\cpp\common\core_codegen.h" />
     <ClInclude Include="$(SolutionDir)\..\src\cpp\server\dynamic_thread_pool.h" />
     <ClInclude Include="$(SolutionDir)\..\src\cpp\server\thread_pool_interface.h" />
   </ItemGroup>
diff --git a/vsprojects/vcxproj/grpc++_unsecure/grpc++_unsecure.vcxproj.filters b/vsprojects/vcxproj/grpc++_unsecure/grpc++_unsecure.vcxproj.filters
index 086fb5a..cd481ff 100644
--- a/vsprojects/vcxproj/grpc++_unsecure/grpc++_unsecure.vcxproj.filters
+++ b/vsprojects/vcxproj/grpc++_unsecure/grpc++_unsecure.vcxproj.filters
@@ -111,6 +111,9 @@
     <ClInclude Include="$(SolutionDir)\..\include\grpc++\impl\client_unary_call.h">
       <Filter>include\grpc++\impl</Filter>
     </ClInclude>
+    <ClInclude Include="$(SolutionDir)\..\include\grpc++\impl\codegen\core_codegen.h">
+      <Filter>include\grpc++\impl\codegen</Filter>
+    </ClInclude>
     <ClInclude Include="$(SolutionDir)\..\include\grpc++\impl\grpc_library.h">
       <Filter>include\grpc++\impl</Filter>
     </ClInclude>
@@ -371,9 +374,6 @@
     <ClInclude Include="$(SolutionDir)\..\src\cpp\client\create_channel_internal.h">
       <Filter>src\cpp\client</Filter>
     </ClInclude>
-    <ClInclude Include="$(SolutionDir)\..\src\cpp\common\core_codegen.h">
-      <Filter>src\cpp\common</Filter>
-    </ClInclude>
     <ClInclude Include="$(SolutionDir)\..\src\cpp\server\dynamic_thread_pool.h">
       <Filter>src\cpp\server</Filter>
     </ClInclude>