title: How to perform a DELETE request without return type or Callback? [Retrofit]
body: <p>I need perform a DELETE request using Retrofit. So, my code snippet of the interface looks like this:</p>
  
  <pre><code>@DELETE("/api/item/{id}")
  void deleteItem(@Path("id") int itemId);
  </code></pre>
  
  <p>But I get the error:</p>
  
  <blockquote>
    <p>java.lang.IllegalArgumentException: ApiItem.deleteItem: Must have
    either a return type or Callback as last argument.</p>
  </blockquote>
  
  <p>However, according to the rules of Rest API, I shouldn't receive any response to DELETE request. How should I specify it in the interface?</p>
  
  <p>Thanks.</p>