Fixes after test in real application

Author: acrobat

src/CachePlugin.php

@@ -66,16 +66,19 @@ public static function clientCache(CacheItemPoolInterface $pool, StreamFactory $
             if (!in_array('no-cache', $config['respect_response_cache_directives'], true)) {
                 $config['respect_response_cache_directives'][] = ['no-cache'];
             }
+            if (!in_array('max-age', $config['respect_response_cache_directives'], true)) {
+                $config['respect_response_cache_directives'][] = ['max-age'];
+            }
         } else {
-            $config['respect_response_cache_directives'] = ['no-cache'];
+            $config['respect_response_cache_directives'] = ['no-cache', 'max-age'];
         }
 
-        self::__construct($pool, $streamFactory, $config);
+        return new self($pool, $streamFactory, $config);
     }
 
     public static function serverCache(CacheItemPoolInterface $pool, StreamFactory $streamFactory, array $config = [])
     {
-        self::__construct($pool, $streamFactory, $config);
+        return new self($pool, $streamFactory, $config);
     }
 
     /**