title: Can I define a grpc call with a null request or response?
body: <p>Does the rpc syntax in proto3 allow null requests or responses?</p>
  <p>e.g. I want the equivalent of the following:</p>
  <pre><code>rpc Logout;
  rpc Status returns (Status);
  rpc Log (LogData);
  </code></pre>
  <p>Or should I just create a null type?</p>
  <pre><code>message Null {};
  
  rpc Logout (Null) returns (Null);
  rpc Status (Null) returns (Status);
  rpc Log (LogData) returns (Null);
  </code></pre>