Bluz\Http\CacheControl::updateCacheControlHeader PHP Метод

    protected function updateCacheControlHeader()
    {
        $parts = [];
        ksort($this->container);
        foreach ($this->container as $key => $value) {
            if (true === $value) {
                $parts[] = $key;
            } else {
                if (preg_match('#[^a-zA-Z0-9._-]#', $value)) {
                    $value = '"' . $value . '"';
                }
                $parts[] = "{$key}={$value}";
            }
        }
        $this->response->setHeader('Cache-Control', implode(', ', $parts));
    }