<span class="hljs-keyword">service </span><span class="hljs-title class_">Greeter</span> {
  <span class="hljs-comment">// Sends a greeting</span>
  <span class="hljs-function"><span class="hljs-keyword">rpc</span> SayHello (HelloRequest) <span class="hljs-keyword">returns</span> (HelloReply) </span>{}
}
