use strict;
use warnings;
use LWP::UserAgent;
use HTTP::Cookies;

my $rssFile = "dump.rss";
my $wwwSite = "www.your.site.here.com";
my $cookieFile = "c:/cookies.txt";
my $browser = LWP::UserAgent->new;

$browser->timeout(10);
$browser->env_proxy;
$browser->cookie_jar(HTTP::Cookies->new(file => $cookieFile ));

my $response = $browser->get( $wwwSite );

if ($response->is_success) {
  open RSSDUMP, ">" . $rssFile;
  print RSSDUMP $response->content;
  close RSSDUMP;
}
else {
  die $response->status_line;
}