syntax = "proto3";

package echo;

service EchoService {
  rpc UnaryEcho (EchoRequest) returns (EchoResponse);
  rpc ServerStreamingEcho (EchoRequest) returns (stream EchoResponse);
  rpc ClientStreamingEcho (stream EchoRequest) returns (EchoResponse);
  rpc BidirectionalEcho (stream EchoRequest) returns (stream EchoResponse);
}

message EchoRequest {
  string message = 1;
}

message EchoResponse {
  string message = 1;
}