Exemplo de auth do proxy com Apache HttpComponents

ClientProxyAuthentication.java

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package org.apache.http.examples.client;

import org.apache.http.HttpEntity;
import org.apache.http.HttpHost;
import org.apache.http.auth.AuthScope;
import org.apache.http.auth.UsernamePasswordCredentials;
import org.apache.http.client.CredentialsProvider;
import org.apache.http.client.config.RequestConfig;
import org.apache.http.client.methods.CloseableHttpResponse;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.impl.client.BasicCredentialsProvider;
import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.HttpClients;
import org.apache.http.util.EntityUtils;

/**
 * A simple example that uses HttpClient to execute an HTTP request
 * over a secure connection tunneled through an authenticating proxy.
 */
public class ClientProxyAuthentication {

    public static void main(String[] args) throws Exception {
        CredentialsProvider credsProvider = new BasicCredentialsProvider();
        credsProvider.setCredentials(
                new AuthScope("localhost", 8080),
                new UsernamePasswordCredentials("username", "password"));
        CloseableHttpClient httpclient = HttpClients.custom()
                .setDefaultCredentialsProvider(credsProvider).build();
        try {
            HttpHost targetHost = new HttpHost("www.verisign.com", 443, "https");
            HttpHost proxy = new HttpHost("localhost", 8080);

            RequestConfig config = RequestConfig.custom()
                .setProxy(proxy)
                .build();
            HttpGet httpget = new HttpGet("/");
            httpget.setConfig(config);

            System.out.println("executing request: " + httpget.getRequestLine());
            System.out.println("via proxy: " + proxy);
            System.out.println("to target: " + targetHost);

            CloseableHttpResponse response = httpclient.execute(targetHost, httpget);
            try {
                HttpEntity entity = response.getEntity();

                System.out.println("----------------------------------------");
                System.out.println(response.getStatusLine());
                if (entity != null) {
                    System.out.println("Response content length: " + entity.getContentLength());
                }
                EntityUtils.consume(entity);
            } finally {
                response.close();
            }
        } finally {
            httpclient.close();
        }
    }
}