Java Proxy system set property and Use Authenticator if it needed/ Then test http connection

JavaBehindProxy.java

package ru.bis.integration.regognition;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.net.Authenticator;
import java.net.HttpURLConnection;
import java.net.PasswordAuthentication;
import java.net.URL;

public class JavaBehindProxy {

    public static final String API_URL = "https://api.github.com";

    public static void main(String... args) throws IOException {
        System.getProperties().put("http.proxyHost", "proxy");
        System.getProperties().put("http.proxyPort", "3128");
        System.getProperties().put("https.proxyHost", "proxy");
        System.getProperties().put("https.proxyPort", "3128");

        final String authUser = "user";
        final String authPassword = "password";

        Authenticator.setDefault(
                new Authenticator() {
                    public PasswordAuthentication getPasswordAuthentication() {
                        return new PasswordAuthentication(
                                authUser, authPassword.toCharArray());
                    }
                }
        );

       /* System.getProperties().put("http.proxyUser", authUser);
        System.getProperties().put("http.proxyPassword", authPassword);*/


        URL urlObj = new URL(API_URL);
        HttpURLConnection connection = (HttpURLConnection) urlObj.openConnection();
        connection.setRequestMethod("GET");

        BufferedReader inputBuffer = new BufferedReader(new InputStreamReader(connection.getInputStream()));
        StringBuilder response = new StringBuilder();
        String inputLine;
        while( (inputLine = inputBuffer.readLine()) != null){
            response.append(inputLine);
        }
        System.out.println(response);

    }
}