syntax = "proto3"; package echo; service Echo { rpc Echo (EchoRequest) returns (EchoResponse) {} rpc EchoStream (EchoRequest) returns (stream EchoResponse) {} rpc EchoInfiniteStream (EchoRequest) returns (stream EchoResponse) {} } message EchoRequest { string message = 1; } message EchoResponse { string message = 1; }