code: @Test public void testNonBlockingHandler() throws Exception {
    try (CloseableHttpClient httpClient=HttpClients.createDefault()){
      HttpGet httpget=new HttpGet(url.toExternalForm());
      HttpResponse response=httpClient.execute(httpget);
      HttpEntity entity=response.getEntity();
      StatusLine statusLine=response.getStatusLine();
      assertEquals(200,statusLine.getStatusCode());
      String result=EntityUtils.toString(entity);
      Assert.assertEquals(SimpleUndertowExtension.THIS_IS_NOT_A_SERVLET,result);
    }
   }
  