title: GWT send Header to c# Backend
body: <p>I try to send a custom header to backend like this: </p>
  
  <pre><code>RequestBuilder builder = new RequestBuilder(RequestBuilder.POST, url);
  builder.setHeader("X-SessionID", "ABC123456");
  </code></pre>
  
  <p>And will recieve it by: </p>
  
  <pre><code>public object AfterReceiveRequest(ref Message request, IClientChannel channel, InstanceContext instanceContext)
  {
  
  }
  </code></pre>
  
  <p>But the 'Message' object is empty! What do i wrong?</p>
  
  <p>Thank you!</p>