code: /** 
   * Make a PUT request with an empty body response
   * @throws Exception
   */
  @Test public void traceEmpty() throws Exception {
    final AtomicReference<String> method=new AtomicReference<String>();
    handler=new RequestHandler(){
      @Override public void handle(    Request request,    HttpServletResponse response){
        method.set(request.getMethod());
        response.setStatus(HTTP_OK);
      }
    }
  ;
    HttpRequest request=trace(url);
    assertNotNull(request.getConnection());
    assertTrue(request.ok());
    assertFalse(request.notFound());
    assertEquals("TRACE",method.get());
    assertEquals("",request.body());
  }
  