Webiny\Component\Http\Response::setAsNotModified PHP Method

    public function setAsNotModified()
    {
        $this->setStatusCode(304);
        $this->setContent('');
        // remove headers that MUST NOT be included with 304 Not Modified responses
        $headersToRemove = ['Allow', 'Content-Encoding', 'Content-Language', 'Content-Length', 'Content-MD5', 'Content-Type', 'Last-Modified'];
        foreach ($headersToRemove as $header) {
            $this->headers->removeKey($header);
        }
        return $this;
    }