my $URL = "http://target.site.com/path/to/file.gz";

my $ua = LWP::UserAgent->new(
    agent =>
'Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.7.8) Gecko/20050511 Firefox/1.0.4'
);
$ua->proxy(['http'], 'http://my.proxy.server/proxy.pac');

my $response = $ua->get("$URL");
 
if ($response->is_success) {
	print $response->content; 
}

else {
	die $response->status_line;
}