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diff --git a/src/proto/grpc/testing/benchmark_service.proto b/src/proto/grpc/testing/benchmark_service.proto
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+++ b/src/proto/grpc/testing/benchmark_service.proto
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+// 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.
+
+// An integration test service that covers all the method signature permutations
+// of unary/streaming requests/responses.
+syntax = "proto3";
+
+import "src/proto/grpc/testing/messages.proto";
+
+package grpc.testing;
+
+service BenchmarkService {
+  // One request followed by one response.
+  // The server returns the client payload as-is.
+  rpc UnaryCall(SimpleRequest) returns (SimpleResponse);
+
+  // Repeated sequence of one request followed by one response.
+  // Should be called streaming ping-pong
+  // The server returns the client payload as-is on each response
+  rpc StreamingCall(stream SimpleRequest) returns (stream SimpleResponse);
+
+  // Single-sided unbounded streaming from client to server
+  // The server returns the client payload as-is once the client does WritesDone
+  rpc StreamingFromClient(stream SimpleRequest) returns (SimpleResponse);
+
+  // Single-sided unbounded streaming from server to client
+  // The server repeatedly returns the client payload as-is
+  rpc StreamingFromServer(SimpleRequest) returns (stream SimpleResponse);
+
+  // Two-sided unbounded streaming between server to client
+  // Both sides send the content of their own choice to the other
+  rpc StreamingBothWays(stream SimpleRequest) returns (stream SimpleResponse);
+}