/**
* Pre-filter issues cache headers.
*
* @param T_Response $response encapsulated response to filter
*/
protected function doPreFilter(T_Response $response)
{
if ($this->cache_time <= 0) {
$response->setHeader('Cache-Control', 'no-cache, must-revalidate');
// HTTP/1.1 uses cache control
$response->setHeader('Pragma', 'no-cache');
// HTTP/1.0 uses pragma
$expiry = time() - 60 * 60 * 24 * 30;
// expired 30 days ago.
} else {
$state = "{$this->type}, max-age={$this->cache_time}, must-revalidate";
$response->setHeader('Cache-Control', $state);
$response->setHeader('Pragma', $this->type);
$expiry = time() + $this->cache_time;
}
$date = gmdate('D, d M Y H:i:s \\G\\M\\T', $expiry);
$response->setHeader('Expires', $date);
}
/**
* Adds Etag and last-modified headers to response.
*
* @param T_Response $response Response to add headers to
*/
protected function setHeader(T_Response $response)
{
$date = gmdate('D, d M Y H:i:s \\G\\M\\T', $this->lm);
$response->setHeader('Last-Modified', $date);
$response->setHeader('Etag', $this->getEtag());
}
/**
* Pre-filter starts buffer.
*
* @param T_Response $response encapsulated response to filter
*/
protected function doPreFilter(T_Response $response)
{
$this->response = $response;
if ($this->isZlibCompressed()) {
return;
}
ob_start();
if ($this->clientAcceptsCompression()) {
/* Headers must be sent in the pre-filter.
(post filter is executed after headers sent) */
$response->setHeader('Content-Encoding', 'gzip');
}
}
