Using Jakarta HttpClient to tunnel through NTLM Proxy

Following code in Java illustrates how Jakarta HttpClient package can be used to tunnel through NTLM proxy. This is handy if you want to download a page periodically and then serve it from your local web server. For this code to compile packages needed are httpclient 3.0, logging 1.0.5 and codec 1.3 (Later versions are also fine). All the jars for these packages must be in classpath while running the code below.

import java.io.*;
import java.net.Socket;
import org.apache.commons.httpclient.*;
import org.apache.commons.httpclient.auth.AuthScope;
import org.apache.commons.httpclient.methods.GetMethod;
 
public class NTLMFetch
{
  public static void main(String[] args) throws Exception 
  {
    // Enable proxy to host logging
    System.setProperty("org.apache.commons.logging.Log", 
               "org.apache.commons.logging.impl.SimpleLog");
    System.setProperty("org.apache.commons.logging.simplelog.
                       showdatetime", "true");
    System.setProperty("org.apache.commons.logging.simplelog.
                        log.httpclient.wire.header", "debug");
    System.setProperty("org.apache.commons.logging.simplelog.
                        log.org.apache.commons.httpclient", "debug");
 
    // Update this to the actual URL
    String url = "http://mysite.com/index.html"; 
    HttpClient client = new HttpClient();
    HttpMethod method = new GetMethod(url);
    HostConfiguration hostConfig= client.getHostConfiguration();
    // Update this to point to NTLM enabled proxy
    hostConfig.setProxy("192.168.0.0", 80); 

    // Authenticate using NTLM
    client.getState().setProxyCredentials(AuthScope.ANY,
          new NTCredentials("userid","password","",""));

    int statusCode = client.executeMethod(method);
    System.out.println("Stat=" +HttpStatus.getStatusText(statusCode));
    String strOutput = method.getResponseBodyAsString();

    // Write the output to a local file
    PrintWriter writer = new PrintWriter(new FileWriter("c:/down.html"));
    writer.println(strOutput);
    writer.close();
  }
}