http_proxy=http://www-proxy.companyDomain:8080/
https_proxy=http://www-proxy.companyDomain:8080/
no_proxy=localhost, 127.0.0.1, .companyDomain

##</code><code>##

use strict;
use warnings;
use LWP::UserAgent;

my $address = "https://companyDomain/subpage";

# Start useragent and get the webpage
my $ua = new LWP::UserAgent;
my $head_request = new HTTP::Request GET => $address;
my $head_response = $ua->request( $head_request );

# Evaluate result
if ($head_response->is_success){ print " is valid\n"; } 
else { print ": is invalid\n"; }

##</code><code>##

$ENV{HTTPS_PROXY} = '';
$ua->proxy(['http', 'https'] => '');
$ua->no_proxy(".companyDomain");
$ua->env_proxy('no_proxy=.companyDomain');