services/helloworld/proto/helloworld.proto

syntax = "proto3";

package helloworld;
option go_package = "./proto;helloworld";

service Helloworld {
	rpc Call(Request) returns (Response) {}
}

// Call returns a personalised "Hello $name" response
message Request {
	string name = 1;
}

message Response {
	string msg = 1;
}