#!/usr/bin/perl
use strict;
use warnings;
use WWW::Mechanize;

my $mech = WWW::Mechanize->new( autocheck => 1 );
$mech->credentials(
    '192.168.0.1:80',
    'FVS318',
    'admin' => 'secret'
);
# And then $mech->get() the same as in the LWP::UserAgent code