code: /** 
   * Get header with multiple response values
   * @throws Exception
   */
  @Test public void getHeaders() throws Exception {
    handler=new RequestHandler(){
      @Override public void handle(    Request request,    HttpServletResponse response){
        response.setStatus(HTTP_OK);
        response.addHeader("a","1");
        response.addHeader("a","2");
      }
    }
  ;
    HttpRequest request=get(url);
    assertTrue(request.ok());
    String[] values=request.headers("a");
    assertNotNull(values);
    assertEquals(2,values.length);
    assertTrue(Arrays.asList(values).contains("1"));
    assertTrue(Arrays.asList(values).contains("2"));
  }
  