diff -u b/core/lib/Drupal/Core/DrupalKernel.php b/core/lib/Drupal/Core/DrupalKernel.php
--- b/core/lib/Drupal/Core/DrupalKernel.php
+++ b/core/lib/Drupal/Core/DrupalKernel.php
@@ -465,7 +465,7 @@
     // Put the request on the stack.
     $this->container->get('request_stack')->push($request);
 
-    // Set the allowed protocols once we have the config available.
+    // Set the allowed protocols.
     UrlHelper::setAllowedProtocols($this->container->getParameter('filter_protocols'));
 
     // Override of Symfony's mime type guesser singleton.