private function addResponseHeaders(RequestInterface $request, ResponseInterface $response)
{
$params = $request->getConfig();
$lookup = $params['cache_lookup'] . ' from GuzzleCache';
$response->addHeader('X-Cache-Lookup', $lookup);
if ($params['cache_hit'] === true) {
$response->addHeader('X-Cache', 'HIT from GuzzleCache');
} elseif ($params['cache_hit'] == 'error') {
$response->addHeader('X-Cache', 'HIT_ERROR from GuzzleCache');
} else {
$response->addHeader('X-Cache', 'MISS from GuzzleCache');
}
$freshness = Utils::getFreshness($response);
// Only add a Warning header if we are returning a stale response.
if ($params['cache_hit'] && $freshness !== null && $freshness <= 0) {
$response->addHeader('Warning', sprintf('%d GuzzleCache/' . ClientInterface::VERSION . ' "%s"', 110, 'Response is stale'));
}
}
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;
}
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;
}
/**
* Test that responses that can't have freshness determined return null.
*/
public function testGetFreshnessNull()
{
$messageFactory = new MessageFactory();
$response = $messageFactory->createResponse(200);
$this->assertSame(null, Utils::getFreshness($response));
}