my $url = "[URL=https://meine-HTTPS-Seite.com;]https://meine-HTTPS-Seite.com";[/URL]
my $name = "acc";
my $name2 = "pwd";
my $value = "meinUser";
my $value2 = "meinPasswd";
my $button = "submit";

use WWW::Mechanize;
use Net::SSLeay;

my $agent = WWW::Mechanize->new(autocheck=>1);
$agent->proxy(['http', 'https'], '[URL=http://meinProxy]http://meinProxy[/URL]:8080/');

$agent->get($url);
$agent->field($name, $value);
$agent->field($name2, $value2);
$agent->click($button);
print $agent->content();