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HTTP/1.1 500 Server Error
Connection: close
...
Please contact the administrator.
</BODY>
</HTML>

use strict;

...
my $res = $ua->request($req);

my $content = $res->as_string;

$ENV{HTTPS_PROXY} = 'http://proxy';
$ENV{HTTPS_PROXY_USERNAME} = 'user';
$ENV{HTTPS_PROXY_PASSWORD} = 'pass';