diff --git a/contrib/endpoints/include/BUILD b/contrib/endpoints/include/BUILD
index c0b31a061b2..a252eb6e3ad 100644
--- a/contrib/endpoints/include/BUILD
+++ b/contrib/endpoints/include/BUILD
@@ -42,6 +42,7 @@ filegroup(
         "api_manager/api_manager.h",
         "api_manager/compute_platform.h",
         "api_manager/env_interface.h",
+        "api_manager/grpc_request.h",
         "api_manager/http_request.h",
         "api_manager/method.h",
         "api_manager/method_call_info.h",
diff --git a/contrib/endpoints/include/api_manager/env_interface.h b/contrib/endpoints/include/api_manager/env_interface.h
index 6308acc6d44..d68ebb3fe6e 100644
--- a/contrib/endpoints/include/api_manager/env_interface.h
+++ b/contrib/endpoints/include/api_manager/env_interface.h
@@ -21,6 +21,7 @@
 #include <functional>
 #include <memory>
 
+#include "contrib/endpoints/include/api_manager/grpc_request.h"
 #include "contrib/endpoints/include/api_manager/http_request.h"
 #include "contrib/endpoints/include/api_manager/periodic_timer.h"
 #include "contrib/endpoints/include/api_manager/utils/status.h"
@@ -58,6 +59,8 @@ class ApiManagerEnvInterface {
   // of the request
   // (possibly before returning).
   virtual void RunHTTPRequest(std::unique_ptr<HTTPRequest> request) = 0;
+
+  virtual void RunGRPCRequest(std::unique_ptr<GRPCRequest> request) = 0;
 };
 
 }  // namespace api_manager
diff --git a/contrib/endpoints/include/api_manager/grpc_request.h b/contrib/endpoints/include/api_manager/grpc_request.h
new file mode 100644
index 00000000000..0eabccc09d2
--- /dev/null
+++ b/contrib/endpoints/include/api_manager/grpc_request.h
@@ -0,0 +1,97 @@
+/* Copyright 2016 Google Inc. All Rights Reserved.
+ *
+ * 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 API_MANAGER_GRPC_REQUEST_H_
+#define API_MANAGER_GRPC_REQUEST_H_
+
+#include <functional>
+#include <string>
+
+#include "contrib/endpoints/include/api_manager/utils/status.h"
+
+namespace google {
+namespace api_manager {
+
+// Represents a Grpc request issued by the API Manager and
+// processed by the environment.
+class GRPCRequest {
+ public:
+  // GRPCRequest constructor without headers in the callback function.
+  GRPCRequest(std::function<void(utils::Status, std::string&&)> callback)
+      : callback_(callback) {}
+
+  // A callback for the environment to invoke when the request is
+  // complete. This will be invoked by the environment exactly once,
+  // and then the environment will drop the std::unique_ptr
+  // referencing the GRPCRequest.
+  void OnComplete(utils::Status status, std::string&& body) {
+    callback_(status, std::move(body));
+  }
+
+  // the gRPC method to call
+  const std::string& method() const { return method_; }
+  GRPCRequest& set_method(const std::string& value) {
+    method_ = value;
+    return *this;
+  }
+  GRPCRequest& set_method(std::string&& value) {
+    method_ = std::move(value);
+    return *this;
+  }
+
+  // DNS or IP address of the gRPC server.
+  const std::string& server() const { return server_; }
+  GRPCRequest& set_server(const std::string& value) {
+    server_ = value;
+    return *this;
+  }
+  GRPCRequest& set_server(std::string&& value) {
+    server_ = std::move(value);
+    return *this;
+  }
+
+  // The gRPC service name.
+  const std::string& service() const { return service_; }
+  GRPCRequest& set_service(const std::string& value) {
+    service_ = value;
+    return *this;
+  }
+  GRPCRequest& set_service(std::string&& value) {
+    service_ = std::move(value);
+    return *this;
+  }
+
+  // The request body serialized as string.
+  const std::string& body() const { return body_; }
+  GRPCRequest& set_body(const std::string& value) {
+    body_ = value;
+    return *this;
+  }
+  GRPCRequest& set_body(std::string&& value) {
+    body_ = std::move(value);
+    return *this;
+  }
+
+ private:
+  std::function<void(utils::Status, std::string&&)> callback_;
+  std::string method_;
+  std::string server_;
+  std::string service_;
+  std::string body_;
+};
+
+}  // namespace api_manager
+}  // namespace google
+
+#endif  // API_MANAGER_GRPC_REQUEST_H_
diff --git a/contrib/endpoints/src/api_manager/mock_api_manager_environment.h b/contrib/endpoints/src/api_manager/mock_api_manager_environment.h
index ae03eaa6f45..041dbc23ac7 100644
--- a/contrib/endpoints/src/api_manager/mock_api_manager_environment.h
+++ b/contrib/endpoints/src/api_manager/mock_api_manager_environment.h
@@ -29,9 +29,13 @@ class MockApiManagerEnvironment : public ApiManagerEnvInterface {
                std::unique_ptr<PeriodicTimer>(std::chrono::milliseconds,
                                               std::function<void()>));
   MOCK_METHOD1(DoRunHTTPRequest, void(HTTPRequest *));
+  MOCK_METHOD1(DoRunGRPCRequest, void(GRPCRequest *));
   virtual void RunHTTPRequest(std::unique_ptr<HTTPRequest> req) {
     DoRunHTTPRequest(req.get());
   }
+  virtual void RunGRPCRequest(std::unique_ptr<GRPCRequest> req) {
+    DoRunGRPCRequest(req.get());
+  }
 };
 
 // A useful mock class to log to stdout to debug Config loading failure.
@@ -53,6 +57,10 @@ class MockApiManagerEnvironmentWithLog : public ApiManagerEnvInterface {
     std::map<std::string, std::string> headers;
     request->OnComplete(utils::Status::OK, std::move(headers), "");
   }
+  void RunGRPCRequest(std::unique_ptr<GRPCRequest> request) {
+    std::map<std::string, std::string> headers;
+    request->OnComplete(utils::Status::OK, "");
+  }
 };
 
 }  // namespace api_manager
diff --git a/src/envoy/prototype/api_manager_env.cc b/src/envoy/prototype/api_manager_env.cc
index 0ef8cb004d5..b058142597e 100644
--- a/src/envoy/prototype/api_manager_env.cc
+++ b/src/envoy/prototype/api_manager_env.cc
@@ -127,5 +127,10 @@ void Env::RunHTTPRequest(
       std::move(message), *callbacks,
       Optional<std::chrono::milliseconds>(std::chrono::milliseconds(10000)));
 }
+
+void Env::RunGRPCRequest(
+    std::unique_ptr<google::api_manager::GRPCRequest> request) {
+  // TODO: send grpc request.
+}
 }
 }
diff --git a/src/envoy/prototype/api_manager_env.h b/src/envoy/prototype/api_manager_env.h
index 6e5e63676aa..0ae8136f5be 100644
--- a/src/envoy/prototype/api_manager_env.h
+++ b/src/envoy/prototype/api_manager_env.h
@@ -26,6 +26,8 @@ class Env : public google::api_manager::ApiManagerEnvInterface,
                      std::function<void()> continuation) override;
   virtual void RunHTTPRequest(
       std::unique_ptr<google::api_manager::HTTPRequest> request) override;
+  virtual void RunGRPCRequest(
+      std::unique_ptr<google::api_manager::GRPCRequest> request) override;
 };
 }
 }