$VAR1 = bless( {}, 'HTTP::Headers' );
$VAR1 = bless( {
                 'client-warning' => 'Internal response',
                 'client-date' => 'Tue, 29 Jul 2014 23:07:18 GMT',
                 'content-type' => 'text/plain'
               }, 'HTTP::Headers' );
>> 500 Unexpected keys - LocalHost