private function handle304Response(RequestInterface $request, ResponseInterface $response, ResponseInterface $validated, CompleteEvent $event)
{
// Make sure that this response has the same ETag
if ($validated->getHeader('ETag') !== $response->getHeader('ETag')) {
// Revalidation failed, so remove from cache and retry.
$this->storage->delete($request);
$event->intercept($event->getClient()->send($request));
return;
}
// Replace cached headers with any of these headers from the
// origin server that might be more up to date
$modified = false;
foreach (self::$replaceHeaders as $name) {
if ($validated->hasHeader($name) && $validated->getHeader($name) != $response->getHeader($name)) {
$modified = true;
$response->setHeader($name, $validated->getHeader($name));
}
}
// Store the updated response in cache
if ($modified) {
$this->storage->cache($request, $response);
}
}
