java.io.IOException：服务器返回HTTP响应代码：400表示URL

我正在开发一个线程java应用程序，它击中了一个url来发送sms消息

问题是我在NTLM代理服务器后面，我已经搜索了大部分时间并尝试了很多解决方案但是没有成功应用程序给出标题错误，当我试图打印错误响应时，我发现它的错误页面来自代理服务器

I am working on a thread java application that hitting a url to send sms messages
the problem is i am behind an NTLM proxy server and i have searched most of the day and tried many solutions but no success the application give the titled error and when i tried to print the error response i have found that its an error page comes from the proxy server

这是命中代码

System.setProperty("java.net.useSystemProxies", "true");
                    System.setProperty("http.proxyHost", AUTH_PROXY");
                    System.setProperty("http.proxyPort", AUTH_PROXY_PORT);
                    System.setProperty("http.proxyUser", AUTH_USER);
                    System.setProperty("http.proxyPassword", AUTH_PASSWORD);

                    Authenticator.setDefault(
                              new Authenticator() {
                                public PasswordAuthentication getPasswordAuthentication() {
                                  return new PasswordAuthentication(AUTH_USER, AUTH_PASSWORD.toCharArray());
                                }
                              }
                            );

                     URL url = new URL(urlString);

                     HttpURLConnection httpConn =(HttpURLConnection)url.openConnection();
                     httpConn.setReadTimeout(10000);
                     String resp = getResponse(httpConn);
                     logger.info("urlString=" + urlString);
                     logger.info("Response=" + resp);

这里我得到了respoonse

here i get the respoonse

private String getResponse(HttpURLConnection Conn) throws IOException {


        InputStream is;
        if (Conn.getResponseCode() >= 400) {
            is = Conn.getErrorStream();
        } else {
            is = Conn.getInputStream();
        }


        String response = "";
        byte buff[] = new byte[512];
        int b = 0;
        while ((b = is.read(buff, 0, buff.length)) != -1) {
            response += new String(buff, 0, b);

        }
        is.close();

        return response;
    }

感谢任何帮助