public static function isResponseValid(RequestInterface $request, ResponseInterface $response)
{
$responseAge = Utils::getResponseAge($response);
$maxAge = Utils::getDirective($response, 'max-age');
// Increment the age based on the X-Guzzle-Cache-Date
if ($cacheDate = $response->getHeader('X-Guzzle-Cache-Date')) {
$responseAge += time() - strtotime($cacheDate);
$response->setHeader('Age', $responseAge);
}
// Check the request's max-age header against the age of the response
if ($maxAge !== null && $responseAge > $maxAge) {
return false;
}
// Check the response's max-age header against the freshness level
$freshness = Utils::getFreshness($response);
if ($freshness !== null) {
$maxStale = Utils::getDirective($request, 'max-stale');
if ($maxStale !== null) {
if ($freshness < -1 * $maxStale) {
return false;
}
} elseif ($maxAge !== null && $responseAge > $maxAge) {
return false;
}
}
return true;
}
private function validateFailed(RequestInterface $request, ResponseInterface $response)
{
$req = Utils::getDirective($request, 'stale-if-error');
$res = Utils::getDirective($response, 'stale-if-error');
if (!$req && !$res) {
return false;
}
$responseAge = Utils::getResponseAge($response);
$maxAge = Utils::getMaxAge($response);
if ($req && $responseAge - $maxAge > $req || $responseAge - $maxAge > $res) {
return false;
}
return true;
}
public static function isResponseValid(RequestInterface $request, ResponseInterface $response)
{
$responseAge = Utils::getResponseAge($response);
$maxAge = Utils::getDirective($response, 'max-age');
// Check the request's max-age header against the age of the response
if ($maxAge !== null && $responseAge > $maxAge) {
return false;
}
// Check the response's max-age header against the freshness level
$freshness = Utils::getFreshness($response);
if ($freshness !== null) {
$maxStale = Utils::getDirective($request, 'max-stale');
if ($maxStale !== null) {
if ($freshness < -1 * $maxStale) {
return false;
}
} elseif ($maxAge !== null && $responseAge > $maxAge) {
return false;
}
}
return true;
}