Can I define a grpc call with a null request or response?

Question

Does the rpc syntax in proto3 allow null requests or responses?

e.g. I want the equivalent of the following:

rpc Logout;
rpc Status returns (Status);         


        

Answer 1

You also can use predefined:

import "google/protobuf/empty.proto";
package MyPackage;

service MyService {
  rpc Check(google.protobuf.Empty) returns (google.protobuf.Empty) {}
}