Resolve #3460258 "Return access denied"

Closes #3460258

modules/lti_tool_provider_content/src/Controller/LTIToolProviderContentLaunch.php

@@ -5,6 +5,7 @@ namespace Drupal\lti_tool_provider_content\Controller;
 use Drupal;
 use Drupal\Core\Access\AccessResult;
 use Drupal\Core\Controller\ControllerBase;
+use Drupal\Core\Url;
 use Drupal\lti_tool_provider\LTIToolProviderContext;
 use Drupal\lti_tool_provider\LTIToolProviderContextInterface;
 use Drupal\lti_tool_provider_content\Event\LtiToolProviderContentEvents;
@@ -61,7 +62,9 @@ class LTIToolProviderContentLaunch extends ControllerBase {
     catch (Exception $e) {
       $this->getLogger('lti_tool_provider_content')->warning($e->getMessage());
       LTIToolProviderContext::sendError($e->getMessage(), $context ?? NULL);
-      return new RedirectResponse('/', 500);
+      $accessDeniedUrl = Url::fromRoute('system.403')->toString();
+      
+      return new RedirectResponse($accessDeniedUrl, 302);
     }
   }