title: RESTlet ClientResource with progress bar
body: <p>I'm creating an android app which is uploading files to RESTlet server. I'm using below code.</p>
  
  <pre><code>Representation file = new FileRepresentation(filePath, MediaType.IMAGE_ALL);
  FormDataSet form = new FormDataSet();
  form.setMultipart(true);
  form.getEntries().add(new FormData("file", file));
  ClientResource cr = new ClientResource(url);
  cr.post(form);
  </code></pre>
  
  <p>The question is: How can I monitor uploading process?</p>