NTLM Proxy Authentication and Jakarta HttpClient

In my current work environment, our Web access is proxied via a MS ISA server, which uses NTML proxy authentication. I was recently looking at NTLM proxy authentication, as I had problems running Subversion inside the proxy (this should be fixed now with the newest release of Neon, Subversion’s WebDAV layer). I am currently looking at some NTLM providers in the Java space, and one of the obvious ones I came across is the Jakarta HttpClient. Here is an example that will authenticate to an NTLM-based proxy. The code is for HttpClient 3.0-RC2.



package uk.co.researchkitchen.ntlm;

import java.io.BufferedReader;

import java.io.IOException;

import java.io.InputStreamReader;

import java.util.ArrayList;

import java.util.List;



import org.apache.commons.httpclient.HttpClient;

import org.apache.commons.httpclient.HttpException;

import org.apache.commons.httpclient.NTCredentials;

import org.apache.commons.httpclient.auth.AuthPolicy;

import org.apache.commons.httpclient.auth.AuthScope;

import org.apache.commons.httpclient.methods.GetMethod;



public class TestNTLM {



    private void execute() throws HttpException, IOException {

        HttpClient proxyclient = new HttpClient();



        proxyclient.getHostConfiguration().setHost("www.yahoo.com");

        proxyclient.getHostConfiguration().setProxy("lproxyhost.researchkitchen.co.uk", 8080);





        List authPrefs = new ArrayList();

        authPrefs.add(AuthPolicy.NTLM);



        proxyclient.getState().setProxyCredentials(

            new AuthScope(null, 8080, null),

            new NTCredentials("username", "password", "", "MYDOMAIN"));



        proxyclient.getParams().setParameter(AuthPolicy.AUTH_SCHEME_PRIORITY, authPrefs);



        GetMethod get = new GetMethod("/");

        int status = proxyclient.executeMethod(get);



        System.out.println(status);



        BufferedReader bis = new BufferedReader(new InputStreamReader(get.getResponseBodyAsStream()));



        int count = 0;

        int read = 0;

        System.out.println("Content length: " + get.getResponseContentLength());

        char[] body = new char[2048];

        do {

          count = bis.read(body);

          read += count;

          System.out.println(body);

        } while (count != -1);



        System.out.println("Read " + read + " bytes");

    }





    public static void main(String[] args) throws HttpException, IOException {

        new TestNTLM().execute();
    }

}

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