try. But not work. At home  below java coding is worked.

C:\Example\javaux\net>java eproxy_tofile
Conneting ... http://www.new-alliance.com/Naam_NAV.htm
java.io.IOException: Server returned HTTP response code: 500 for URL:
http://www.new-alliance.com/Naam_NAV.htm
       at
sun.net.www.protocol.http.HttpURLConnection.getInputStream(HttpURLConnection.java:800)
       at java.net.URL.openStream(URL.java:913)
       at eproxy_tofile.main(eproxy_tofile.java:53)

C:\Example\javaux\net>

/*

eproxy_tofile.java
2006/08/14 eric.leung

Environment variable set to
* CLASSPATH=c:\j2sdk1.4.1_01\lib\classes.zip;c:\example;.
*
*/

import java.util.Properties;
import java.io.*;
import java.net.*;
import java.net.Authenticator;

public class eproxy_tofile {
 public static void main(String[] args) {
   Properties systemSettings = System.getProperties();

class MyAuthenticator extends Authenticator {
   protected PasswordAuthentication getPasswordAuthentication() {
      return new PasswordAuthentication("xxx", "xxx".toCharArray());
   }

}
     // String host,port,userid,passwd;

    systemSettings.put("proxySet","true");
       systemSettings.put("http.proxyHost",host);
       systemSettings.put("http.proxyPort",port);

  // System.setProperty("https.proxyUserName",userid);
  // System.setProperty("https.proxyPassword",passwd);

       System.setProperties(systemSettings);

        Authenticator.setDefault(new MyAuthenticator());

   try {

      String Addr = "http://www.new-alliance.com/Naam_NAV.htm";

       URL yahoo = new URL(Addr);
       System.out.println("Conneting ... " + Addr);

       BufferedReader in = new BufferedReader(new InputStreamReader
        (yahoo.openStream()));

        String inputLine;
        while ((inputLine = in.readLine()) !=null)
          System.out.println(inputLine);
       in.close();

   }
   catch (Exception exc) {
       exc.printStackTrace();
      
      
    }

 }

}