Fix BUG Digest Auth

[dreamsxin]

No description provided.

[phalcon]

Is there a example about the usage of this functionality?

[dreamsxin]

@phalcon Examples should be placed where?
Can see http://www.php.net/manual/en/features.http-auth.php Digest HTTP Authentication example

$auth = $this->request->getDigestAuth(); 
if (empty($auth)) {
    $this->response->setStatusCode('401', 'Unauthorized');
    $this->response->setHeader('WWW-Authenticate', 'Digest realm="'.$realm. '" qop="auth" nonce="'.uniqid().'" opaque="'.md5($realm).'"');

    $this->response->setContent('Text to send if user hits Cancel button');
}