Increment the age of the response #59

Author: bmancone

src/CacheSubscriber.php

@@ -164,6 +164,8 @@ public function onComplete(CompleteEvent $event)
             && call_user_func($this->canCache, $request)
             && Utils::canCacheResponse($response)
         ) {
+            // Store the date when the response was cached
+            $response->setHeader('X-Guzzle-Cache-Date', gmdate('D, d M Y H:i:s T', time()));
             $this->storage->cache($request, $response);
         }
 

src/Utils.php

@@ -44,7 +44,14 @@ public static function getDirective(MessageInterface $message, $part)
     public static function getResponseAge(ResponseInterface $response)
     {
         if ($response->hasHeader('Age')) {
-            return (int) $response->getHeader('Age');
+            $age = (int) $response->getHeader('Age');
+
+            // Increment the age based on the X-Guzzle-Cache-Date
+            if ($cacheDate = $response->getHeader('X-Guzzle-Cache-Date')) {
+                $age += (time() - strtotime($cacheDate));
+            }
+
+            return $age;
         }
 
         $date = strtotime($response->getHeader('Date') ?: 'now');