use LWP::UserAgent;

my $ua = LWP::UserAgent->new;
$ua->timeout(10);
$ua->env_proxy;

my $url = 'http://cpan.uwinnipeg.ca/htdocs/libwww-perl/LWP/UserAgent.html';

my $response = $ua->get($url, Range => 'bytes=-500');

print $response->content;