comparison vendor/symfony/http-foundation/RedirectResponse.php @ 5:12f9dff5fda9 tip

Update to Drupal core 8.7.1

 
         if (!$this->isRedirect()) {
             throw new \InvalidArgumentException(sprintf('The HTTP status code is not a redirect ("%s" given).', $status));
         }
 
-        if (301 == $status && !array_key_exists('cache-control', $headers)) {
+        if (301 == $status && !\array_key_exists('cache-control', $headers)) {
             $this->headers->remove('cache-control');
         }
     }
 
     /**