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diff --git a/examples/cpp/metadata/helloworld.grpc.pb.h b/examples/cpp/metadata/helloworld.grpc.pb.h
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+++ b/examples/cpp/metadata/helloworld.grpc.pb.h
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+// Generated by the gRPC C++ plugin.
+// If you make any local change, they will be lost.
+// source: helloworld.proto
+// Original file comments:
+// Copyright 2015 gRPC authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+#ifndef GRPC_helloworld_2eproto__INCLUDED
+#define GRPC_helloworld_2eproto__INCLUDED
+
+#include "helloworld.pb.h"
+
+#include <functional>
+#include <grpcpp/impl/codegen/async_generic_service.h>
+#include <grpcpp/impl/codegen/async_stream.h>
+#include <grpcpp/impl/codegen/async_unary_call.h>
+#include <grpcpp/impl/codegen/method_handler_impl.h>
+#include <grpcpp/impl/codegen/proto_utils.h>
+#include <grpcpp/impl/codegen/rpc_method.h>
+#include <grpcpp/impl/codegen/service_type.h>
+#include <grpcpp/impl/codegen/status.h>
+#include <grpcpp/impl/codegen/stub_options.h>
+#include <grpcpp/impl/codegen/sync_stream.h>
+
+namespace grpc {
+class CompletionQueue;
+class Channel;
+class ServerCompletionQueue;
+class ServerContext;
+}  // namespace grpc
+
+namespace helloworld {
+
+// The greeting service definition.
+class Greeter final {
+ public:
+  static constexpr char const* service_full_name() {
+    return "helloworld.Greeter";
+  }
+  class StubInterface {
+   public:
+    virtual ~StubInterface() {}
+    // Sends a greeting
+    virtual ::grpc::Status SayHello(::grpc::ClientContext* context, const ::helloworld::HelloRequest& request, ::helloworld::HelloReply* response) = 0;
+    std::unique_ptr< ::grpc::ClientAsyncResponseReaderInterface< ::helloworld::HelloReply>> AsyncSayHello(::grpc::ClientContext* context, const ::helloworld::HelloRequest& request, ::grpc::CompletionQueue* cq) {
+      return std::unique_ptr< ::grpc::ClientAsyncResponseReaderInterface< ::helloworld::HelloReply>>(AsyncSayHelloRaw(context, request, cq));
+    }
+    std::unique_ptr< ::grpc::ClientAsyncResponseReaderInterface< ::helloworld::HelloReply>> PrepareAsyncSayHello(::grpc::ClientContext* context, const ::helloworld::HelloRequest& request, ::grpc::CompletionQueue* cq) {
+      return std::unique_ptr< ::grpc::ClientAsyncResponseReaderInterface< ::helloworld::HelloReply>>(PrepareAsyncSayHelloRaw(context, request, cq));
+    }
+    class experimental_async_interface {
+     public:
+      virtual ~experimental_async_interface() {}
+      // Sends a greeting
+      virtual void SayHello(::grpc::ClientContext* context, const ::helloworld::HelloRequest* request, ::helloworld::HelloReply* response, std::function<void(::grpc::Status)>) = 0;
+    };
+    virtual class experimental_async_interface* experimental_async() { return nullptr; }
+  private:
+    virtual ::grpc::ClientAsyncResponseReaderInterface< ::helloworld::HelloReply>* AsyncSayHelloRaw(::grpc::ClientContext* context, const ::helloworld::HelloRequest& request, ::grpc::CompletionQueue* cq) = 0;
+    virtual ::grpc::ClientAsyncResponseReaderInterface< ::helloworld::HelloReply>* PrepareAsyncSayHelloRaw(::grpc::ClientContext* context, const ::helloworld::HelloRequest& request, ::grpc::CompletionQueue* cq) = 0;
+  };
+  class Stub final : public StubInterface {
+   public:
+    Stub(const std::shared_ptr< ::grpc::ChannelInterface>& channel);
+    ::grpc::Status SayHello(::grpc::ClientContext* context, const ::helloworld::HelloRequest& request, ::helloworld::HelloReply* response) override;
+    std::unique_ptr< ::grpc::ClientAsyncResponseReader< ::helloworld::HelloReply>> AsyncSayHello(::grpc::ClientContext* context, const ::helloworld::HelloRequest& request, ::grpc::CompletionQueue* cq) {
+      return std::unique_ptr< ::grpc::ClientAsyncResponseReader< ::helloworld::HelloReply>>(AsyncSayHelloRaw(context, request, cq));
+    }
+    std::unique_ptr< ::grpc::ClientAsyncResponseReader< ::helloworld::HelloReply>> PrepareAsyncSayHello(::grpc::ClientContext* context, const ::helloworld::HelloRequest& request, ::grpc::CompletionQueue* cq) {
+      return std::unique_ptr< ::grpc::ClientAsyncResponseReader< ::helloworld::HelloReply>>(PrepareAsyncSayHelloRaw(context, request, cq));
+    }
+    class experimental_async final :
+      public StubInterface::experimental_async_interface {
+     public:
+      void SayHello(::grpc::ClientContext* context, const ::helloworld::HelloRequest* request, ::helloworld::HelloReply* response, std::function<void(::grpc::Status)>) override;
+     private:
+      friend class Stub;
+      explicit experimental_async(Stub* stub): stub_(stub) { }
+      Stub* stub() { return stub_; }
+      Stub* stub_;
+    };
+    class experimental_async_interface* experimental_async() override { return &async_stub_; }
+
+   private:
+    std::shared_ptr< ::grpc::ChannelInterface> channel_;
+    class experimental_async async_stub_{this};
+    ::grpc::ClientAsyncResponseReader< ::helloworld::HelloReply>* AsyncSayHelloRaw(::grpc::ClientContext* context, const ::helloworld::HelloRequest& request, ::grpc::CompletionQueue* cq) override;
+    ::grpc::ClientAsyncResponseReader< ::helloworld::HelloReply>* PrepareAsyncSayHelloRaw(::grpc::ClientContext* context, const ::helloworld::HelloRequest& request, ::grpc::CompletionQueue* cq) override;
+    const ::grpc::internal::RpcMethod rpcmethod_SayHello_;
+  };
+  static std::unique_ptr<Stub> NewStub(const std::shared_ptr< ::grpc::ChannelInterface>& channel, const ::grpc::StubOptions& options = ::grpc::StubOptions());
+
+  class Service : public ::grpc::Service {
+   public:
+    Service();
+    virtual ~Service();
+    // Sends a greeting
+    virtual ::grpc::Status SayHello(::grpc::ServerContext* context, const ::helloworld::HelloRequest* request, ::helloworld::HelloReply* response);
+  };
+  template <class BaseClass>
+  class WithAsyncMethod_SayHello : public BaseClass {
+   private:
+    void BaseClassMustBeDerivedFromService(const Service *service) {}
+   public:
+    WithAsyncMethod_SayHello() {
+      ::grpc::Service::MarkMethodAsync(0);
+    }
+    ~WithAsyncMethod_SayHello() override {
+      BaseClassMustBeDerivedFromService(this);
+    }
+    // disable synchronous version of this method
+    ::grpc::Status SayHello(::grpc::ServerContext* context, const ::helloworld::HelloRequest* request, ::helloworld::HelloReply* response) override {
+      abort();
+      return ::grpc::Status(::grpc::StatusCode::UNIMPLEMENTED, "");
+    }
+    void RequestSayHello(::grpc::ServerContext* context, ::helloworld::HelloRequest* request, ::grpc::ServerAsyncResponseWriter< ::helloworld::HelloReply>* response, ::grpc::CompletionQueue* new_call_cq, ::grpc::ServerCompletionQueue* notification_cq, void *tag) {
+      ::grpc::Service::RequestAsyncUnary(0, context, request, response, new_call_cq, notification_cq, tag);
+    }
+  };
+  typedef WithAsyncMethod_SayHello<Service > AsyncService;
+  template <class BaseClass>
+  class WithGenericMethod_SayHello : public BaseClass {
+   private:
+    void BaseClassMustBeDerivedFromService(const Service *service) {}
+   public:
+    WithGenericMethod_SayHello() {
+      ::grpc::Service::MarkMethodGeneric(0);
+    }
+    ~WithGenericMethod_SayHello() override {
+      BaseClassMustBeDerivedFromService(this);
+    }
+    // disable synchronous version of this method
+    ::grpc::Status SayHello(::grpc::ServerContext* context, const ::helloworld::HelloRequest* request, ::helloworld::HelloReply* response) override {
+      abort();
+      return ::grpc::Status(::grpc::StatusCode::UNIMPLEMENTED, "");
+    }
+  };
+  template <class BaseClass>
+  class WithRawMethod_SayHello : public BaseClass {
+   private:
+    void BaseClassMustBeDerivedFromService(const Service *service) {}
+   public:
+    WithRawMethod_SayHello() {
+      ::grpc::Service::MarkMethodRaw(0);
+    }
+    ~WithRawMethod_SayHello() override {
+      BaseClassMustBeDerivedFromService(this);
+    }
+    // disable synchronous version of this method
+    ::grpc::Status SayHello(::grpc::ServerContext* context, const ::helloworld::HelloRequest* request, ::helloworld::HelloReply* response) override {
+      abort();
+      return ::grpc::Status(::grpc::StatusCode::UNIMPLEMENTED, "");
+    }
+    void RequestSayHello(::grpc::ServerContext* context, ::grpc::ByteBuffer* request, ::grpc::ServerAsyncResponseWriter< ::grpc::ByteBuffer>* response, ::grpc::CompletionQueue* new_call_cq, ::grpc::ServerCompletionQueue* notification_cq, void *tag) {
+      ::grpc::Service::RequestAsyncUnary(0, context, request, response, new_call_cq, notification_cq, tag);
+    }
+  };
+  template <class BaseClass>
+  class WithStreamedUnaryMethod_SayHello : public BaseClass {
+   private:
+    void BaseClassMustBeDerivedFromService(const Service *service) {}
+   public:
+    WithStreamedUnaryMethod_SayHello() {
+      ::grpc::Service::MarkMethodStreamed(0,
+        new ::grpc::internal::StreamedUnaryHandler< ::helloworld::HelloRequest, ::helloworld::HelloReply>(std::bind(&WithStreamedUnaryMethod_SayHello<BaseClass>::StreamedSayHello, this, std::placeholders::_1, std::placeholders::_2)));
+    }
+    ~WithStreamedUnaryMethod_SayHello() override {
+      BaseClassMustBeDerivedFromService(this);
+    }
+    // disable regular version of this method
+    ::grpc::Status SayHello(::grpc::ServerContext* context, const ::helloworld::HelloRequest* request, ::helloworld::HelloReply* response) override {
+      abort();
+      return ::grpc::Status(::grpc::StatusCode::UNIMPLEMENTED, "");
+    }
+    // replace default version of method with streamed unary
+    virtual ::grpc::Status StreamedSayHello(::grpc::ServerContext* context, ::grpc::ServerUnaryStreamer< ::helloworld::HelloRequest,::helloworld::HelloReply>* server_unary_streamer) = 0;
+  };
+  typedef WithStreamedUnaryMethod_SayHello<Service > StreamedUnaryService;
+  typedef Service SplitStreamedService;
+  typedef WithStreamedUnaryMethod_SayHello<Service > StreamedService;
+};
+
+}  // namespace helloworld
+
+
+#endif  // GRPC_helloworld_2eproto__INCLUDED