Perl LWP user authentication

Shell Programming and Scripting
1

Hello all.. i am new to perl scripting.. i wanted to parse a text file, encode the parsed text and attach in url.. please point me to right resources if you know any..This is my major problem. Now i try to get a url running and save it in a text file using LWP module in perl, I used following program to connect to google but getting "401 UNAUTHORIZED" error. please help where i should provide my user authentication details and passwrd.

#!/usr/bin/perl
    use strict;
    use warnings;
    use LWP::UserAgent;
    use HTTP::Request::Common qw(GET);
    use HTTP::Cookies;

    my $ua = LWP::UserAgent->new;

    # Define user agent type
    $ua->agent('Mozilla/8.0');

    # Cookies
    $ua->cookie_jar(
        HTTP::Cookies->new(
            file => 'mycookies.txt',
            autosave => 1
        )
    );

    # Request object
    my $req = GET 'http://www.google.com';

    # Make the request
    my $res = $ua->request($req);

    # Check the response
    if ($res->is_success) {
        print $res->content;
    } else {
        print $res->status_line . "\n";
    }

    exit 0;