It isn't readily apparent from the docs how to get at the HTTP headers while using WWW::Mechanize. The miscellaneous add_header and delete_header likely don't do what you want. The following snippet gets you a complete list of headers and their values as well as shows you how to get a specific value if you know the header key in advance.
#!/usr/bin/perl
use strict;
use warnings;
use WWW::Mechanize;

my $mech = WWW::Mechanize->new( autocheck => 1 );
$mech->get( 'http://www.perlmonks.org/' );

my $response = $mech->response();
for my $key ( $response->header_field_names() ) {
    print $key, " : ", $response->header( $key ), "\n";
}
# Or if you know the header key in advance
my $header = $mech->response()->header( 'key' );

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In reply to HTTP Headers Using WWW::Mechanize by Limbic~Region

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