public function allowOrigin(array $excepted)
    {
        if (!is_array($excepted)) {
            throw new AccessControlException(
                'Attend un tableau.' . gettype($excepted) . ' donner.',
                E_USER_ERROR
            );
        }

        return $this->push(
            'Access-Control-Allow-Origin',
            implode(', ', $excepted)
        );
    }