Returns true if the response includes headers that can be used to validate
the response with the origin server using a conditional GET request.
| public isValidateable ( ) : boolean | ||
| return | boolean | true if the response is validateable, false otherwise |
/**
* {@inheritdoc}
*/
public function update(Response $response)
{
// if we have no embedded Response, do nothing
if (0 === $this->embeddedResponses) {
return;
}
// Remove validation related headers in order to avoid browsers using
// their own cache, because some of the response content comes from
// at least one embedded response (which likely has a different caching strategy).
if ($response->isValidateable()) {
$response->setEtag(null);
$response->setLastModified(null);
$this->cacheable = false;
}
if (!$this->cacheable) {
$response->headers->set('Cache-Control', 'no-cache, must-revalidate');
return;
}
$this->ttls[] = $response->getTtl();
$this->maxAges[] = $response->getMaxAge();
if (null !== ($maxAge = min($this->maxAges))) {
$response->setSharedMaxAge($maxAge);
$response->headers->set('Age', $maxAge - min($this->ttls));
}
$response->setMaxAge(0);
}
/**
* Adds a Response.
*
* @param Response $response
*/
public function add(Response $response)
{
if ($response->isValidateable()) {
$this->cacheable = false;
} else {
$this->ttls[] = $response->getTtl();
$this->maxAges[] = $response->getMaxAge();
}
}
public function testIsValidateable()
{
$response = new Response('', 200, array('Last-Modified' => $this->createDateTimeOneHourAgo()->format(DATE_RFC2822)));
$this->assertTrue($response->isValidateable(), '->isValidateable() returns true if Last-Modified is present');
$response = new Response('', 200, array('ETag' => '"12345"'));
$this->assertTrue($response->isValidateable(), '->isValidateable() returns true if ETag is present');
$response = new Response();
$this->assertFalse($response->isValidateable(), '->isValidateable() returns false when no validator is present');
}
/**
* Stores the response's TTL locally.
*
* @param Response $response
*/
protected function addEsiTtl(Response $response)
{
$this->esiTtls[] = $response->isValidateable() ? -1 : $response->getTtl();
}