code: /** 
   * Verify 'Referer' header
   * @throws Exception
   */
  @Test public void refererHeader() throws Exception {
    final AtomicReference<String> referer=new AtomicReference<String>();
    handler=new RequestHandler(){
      @Override public void handle(    Request request,    HttpServletResponse response){
        referer.set(request.getHeader("Referer"));
        response.setStatus(HTTP_OK);
      }
    }
  ;
    assertTrue(post(url).referer("http://heroku.com").ok());
    assertEquals("http://heroku.com",referer.get());
  }
  