public function exposeHeaders(array $excepted)
    {
        if (count($excepted) == 0) {
            throw new AccessControlException(
                'Le tableau est vide.' . gettype($excepted) . ' donner.',
                E_USER_ERROR
            );
        }

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