example/backup_request_c++/echo.proto

syntax="proto2";
package example;

option cc_generic_services = true;

message EchoRequest {
  required int32 index = 1;
};

message EchoResponse {
  required int32 index = 1;
};

service EchoService {
  rpc Echo(EchoRequest) returns (EchoResponse);
};