public function testIsNoCache()
{
$request = new Request();
$isNoCache = $request->isNoCache();
$this->assertFalse($isNoCache);
}
/**
* Store a response generated by a request.
*
* @param Request $request
* @param Response $response
* @param integer $ttl
*/
public function cache(Request $request, Response $response, $ttl = null)
{
// only cache GET and HEAD requests
if (!in_array($request->getMethod(), array('GET', 'HEAD'))) {
return;
}
// respect Cache-Control: no-cache
if ($request->isNoCache()) {
return;
}
// skip already cached response
if ($response->headers->has('X-ServerCache-Key')) {
return;
}
// set cache lifetime
if (is_null($ttl)) {
$ttl = $this->defaultTtl;
}
$expirationDate = date_create('NOW + ' . $ttl . ' seconds');
// save cache item
$key = $this->getCacheKey($request);
$metadataReponse = new MetadataResponse($response, array("expirationDate" => $expirationDate));
$item = new CacheItem($key, true, $metadataReponse);
$item->expiresAt($expirationDate);
$this->cache->save($item);
}
/**
* Lookups a Response from the cache for the given Request.
*
* When a matching cache entry is found and is fresh, it uses it as the
* response without forwarding any request to the backend. When a matching
* cache entry is found but is stale, it attempts to "validate" the entry with
* the backend using conditional GET. When no matching cache entry is found,
* it triggers "miss" processing.
*
* @param Request $request A Request instance
* @param bool $catch whether to process exceptions
*
* @return Response A Response instance
*
* @throws \Exception
*/
protected function lookup(Request $request, $catch = false)
{
// if allow_reload and no-cache Cache-Control, allow a cache reload
if ($this->options['allow_reload'] && $request->isNoCache()) {
$this->record($request, 'reload');
return $this->fetch($request, $catch);
}
try {
$entry = $this->store->lookup($request);
} catch (\Exception $e) {
$this->record($request, 'lookup-failed');
if ($this->options['debug']) {
throw $e;
}
return $this->pass($request, $catch);
}
if (null === $entry) {
$this->record($request, 'miss');
return $this->fetch($request, $catch);
}
if (!$this->isFreshEnough($request, $entry)) {
$this->record($request, 'stale');
return $this->validate($request, $entry, $catch);
}
$this->record($request, 'fresh');
$entry->headers->set('Age', $entry->getAge());
return $entry;
}