/** * Modifies the response so that it conforms to the rules defined for a 304 status code. * * This sets the status, removes the body, and discards any headers * that MUST NOT be included in 304 responses. * * @see http://tools.ietf.org/html/rfc2616#section-10.3.5 */ public function setNotModified() { $this->setStatusCode(304); $this->setContent(null); // remove headers that MUST NOT be included with 304 Not Modified responses foreach (array('Allow', 'Content-Encoding', 'Content-Language', 'Content-Length', 'Content-MD5', 'Content-Type', 'Last-Modified') as $header) { $this->headers->delete($header); } }