code: protected void doPostForm(String path, MultivaluedMap<String, String> formParams) throws ClientException {
          doPostForm(path, formParams, null);
      }
docs: Submits a form. Adds appropriate Accepts and Content Type headers.
  
  @param path the API to call.
  @param formParams the form parameters to send.
  
  @throws ClientException if a status code other than 200 (OK) and 204 (No
  Content) is returned.