username=engineer&password=ARC%24eng%26123HTTP/1.0 200 OK

Set-Cookie: sysauth=648493960F100A5A0297276EED3F9D15; path=/cgi-bin/luci/;stok=7D13FC47E626011E8534793B2C7DF288

Content-Type: text/html

Cache-Control: no-cache

Expires: 0
##</code><code>##

#!/usr/bin/perl
use warnings;
use strict;
use LWP;
use HTTP
my $browser = LWP::UserAgent->new;
$browser->agent('localbot');
    $browser->credentials(
        'http://192.168.1.1/cgi-bin/luci/engineer/advanced/diagnostics/upgrade/:80',
        'testing',#<- the $realm
        'engineer' => '1234'
      );
  
    my $cookie_jar = HTTP::Cookies->new(
        file     => "/some/where/cookies.lwp",
        autosave => 1,
     );
    $browser = LWP::UserAgent->new;
    $browser->cookie_jar( $cookie_jar );