Issue #2618606 by dawehner, rbayliss: Update.php - Reverse proxy settings not used

(cherry picked from commit 46f0215)

Author: alexpott

lib/Drupal/Core/Update/UpdateKernel.php

@@ -5,6 +5,7 @@
 use Drupal\Core\DrupalKernel;
 use Drupal\Core\Session\AnonymousUserSession;
 use Drupal\Core\Site\Settings;
+use Drupal\Core\StackMiddleware\ReverseProxyMiddleware;
 use Symfony\Cmf\Component\Routing\RouteObjectInterface;
 use Symfony\Component\HttpFoundation\ParameterBag;
 use Symfony\Component\HttpFoundation\Request;
@@ -59,6 +60,7 @@ public function handle(Request $request, $type = self::MASTER_REQUEST, $catch =
 
       // First boot up basic things, like loading the include files.
       $this->initializeSettings($request);
+      ReverseProxyMiddleware::setSettingsOnRequest($request, Settings::getInstance());
       $this->boot();
       $container = $this->getContainer();
       /** @var \Symfony\Component\HttpFoundation\RequestStack $request_stack */