public function testGetTtl()
{
$response = new Response();
$this->assertNull($response->getTtl(), '->getTtl() returns null when no Expires or Cache-Control headers are present');
$response = new Response();
$response->headers->set('Expires', $this->createDateTimeOneHourLater()->format(DATE_RFC2822));
$this->assertLessThan(1, 3600 - $response->getTtl(), '->getTtl() uses the Expires header when no max-age is present');
$response = new Response();
$response->headers->set('Expires', $this->createDateTimeOneHourAgo()->format(DATE_RFC2822));
$this->assertLessThan(0, $response->getTtl(), '->getTtl() returns negative values when Expires is in part');
$response = new Response();
$response->headers->set('Cache-Control', 'max-age=60');
$this->assertLessThan(1, 60 - $response->getTtl(), '->getTtl() uses Cache-Control max-age when present');
}
/**
* Forwards the Request to the backend and returns the Response.
*
* @param Symfony\Components\HttpFoundation\Request $request A Request instance
* @param Boolean $raw Whether to catch exceptions or not
* @param Symfony\Components\HttpFoundation\Response $response A Response instance (the stale entry if present, null otherwise)
*
* @return Symfony\Components\HttpFoundation\Response A Response instance
*/
protected function forward(Request $request, $raw = false, Response $entry = null)
{
if ($this->esi) {
$this->esi->addSurrogateEsiCapability($request);
}
// always a "master" request (as the real master request can be in cache)
$response = $this->kernel->handle($request, HttpKernelInterface::MASTER_REQUEST, $raw);
// FIXME: we probably need to also catch exceptions if raw === true
// we don't implement the stale-if-error on Requests, which is nonetheless part of the RFC
if (null !== $entry && in_array($response->getStatusCode(), array(500, 502, 503, 504))) {
if (null === ($age = $entry->headers->getCacheControl()->getStaleIfError())) {
$age = $this->options['stale_if_error'];
}
if (abs($entry->getTtl()) < $age) {
$this->record($request, 'stale-if-error');
return $entry;
}
}
$this->processResponseBody($request, $response);
return $response;
}