无法在谷歌应用引擎中获得响应

Question

您好我必须在谷歌应用引擎中部署一个servlet。但无法在以下代码中获得响应。我甚至没有在log中获得错误。以下是代码片段。

String executeHttpRequest(String jsonData,  HttpPost httpPost,HttpServletResponse resp)  throws UnsupportedEncodingException, IOException
{
     resp.getWriter().println("inside execute http req1");
    HttpResponse response=null;
    String line = "";
    StringBuffer result = new StringBuffer();
    resp.getWriter().println("inside execute http req2");
    httpPost.setEntity(new StringEntity(jsonData));
    HttpClient client = HttpClientBuilder.create().build();
    resp.getWriter().println("inside execute http req3");

    response = client.execute(httpPost);

    resp.getWriter().println("inside execute http req4");

    BufferedReader reader = new BufferedReader(new InputStreamReader(response.getEntity().getContent()));
    while ((line = reader.readLine()) != null){ result.append(line); }
    resp.getWriter().println("inside execute http req5");
    resp.getWriter().println(result.toString());
    String resultstring=result.toString();
    return resultstring;
}

在此代码中，我没有收到回复

 response = client.execute(httpPost);

直到那里一切都很顺利。但要点是需要从webservice获得响应。 首先我在jetty服务器上执行它。它工作正常。然后我在谷歌应用程序引擎中部署。