please check my reply .

Here is the updated code and same error.

#!/usr/bin/perl
use strict;

BEGIN {
    $ENV{HTTPS_PROXY} = 'my_proxy:port';
};



use WWW::Mechanize;
use Crypt::SSLeay;


my $mech = WWW::Mechanize->new(autocheck => 1,noproxy => 1);

$mech->cookie_jar(HTTP::Cookies->new);
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