java use jvm proxy setting still returns 407 while postman works fine

Question

Here is my postman config

it works just find, can obtain my target url content, while in intellij, the code is like below,

  public static void main(String[] args) throws IOException, InterruptedException {
    System.setProperty("java.net.useSystemProxies", "true");
    String url = "http://xxxx/";

    String charset = "UTF-8";
    URLConnection connection = new URL(url).openConnection();
    connection.setRequestProperty("Accept-Charset", charset);
    InputStream response = connection.getInputStream();
    String result = new BufferedReader(new InputStreamReader(response))
            .lines().collect(Collectors.joining("\n"));

    System.out.println(result);

}

I also have my jvm args added like

-Dhttp.proxyUser=username -Dhttp.proxyPassword=password -Dhttp.proxyHost=proxyhost -Dhttp.proxyPort=8080 

but above code keeps saying: Server returned HTTP response code: 407 for URL

Can someone tell me anything I missed here?

Answer 1

find answer from HTTP Error 407 Proxy authentication required and it worked, need to add below code

    Authenticator.setDefault(new Authenticator()
    {
        protected PasswordAuthentication getPasswordAuthentication()
        {
            return new PasswordAuthentication("username","password".toCharArray());
        }
    });