Bug in "[Bug Report] undefined header "Content-Type" for output the captcha challenge"

[Daijobou]

With the actual Version I get often very long page loading time. Firebug says Keep-Alive: 5

I have fix this for me:

...\kohana\modules\captcha\classes\controller\captcha.php

FIND:
$this->request->headers['Content-Type'] = File::mime($captcha);

AFTER ADD NEW LINE:
$this->request->headers['Connection'] = 'close';

I hope this help. :)

[kolanos]

Applied proposed fix in 4fe18f0 for testing.