diff --git a/core/lib/Drupal/Core/EventSubscriber/HttpExceptionSubscriberBase.php b/core/lib/Drupal/Core/EventSubscriber/HttpExceptionSubscriberBase.php
index 7973f08..84fe421 100644
--- a/core/lib/Drupal/Core/EventSubscriber/HttpExceptionSubscriberBase.php
+++ b/core/lib/Drupal/Core/EventSubscriber/HttpExceptionSubscriberBase.php
@@ -92,7 +92,7 @@ public function onException(GetResponseForExceptionEvent $event) {
       $method = 'on' . $exception->getStatusCode();
       // Keep just the leading number of the status code to produce either a
       // on400 or a 500 method callback.
-      $method_fallback = 'on' . (int) ($exception->getStatusCode() / 100) . '00';
+      $method_fallback = 'on' . floor($exception->getStatusCode() / 100) . '00';
       // We want to allow the method to be called and still not set a response
       // if it has additional filtering logic to determine when it will apply.
       // It is therefore the method's responsibility to set the response on the
diff --git a/core/modules/rest/src/Tests/AuthTest.php b/core/modules/rest/src/Tests/AuthTest.php
index 08db9ab..3246ba1 100644
--- a/core/modules/rest/src/Tests/AuthTest.php
+++ b/core/modules/rest/src/Tests/AuthTest.php
@@ -34,7 +34,7 @@ public function testRead() {
     // Try to read the resource as an anonymous user, which should not work.
     $this->httpRequest($entity->urlInfo()->setRouteParameter('_format', $this->defaultFormat), 'GET');
     $this->assertResponse('401', 'HTTP response code is 401 when the request is not authenticated and the user is anonymous.');
-    $this->assertRaw(json_encode(['message' => 'A fatal error occurred: No authentication credentials provided.']));
+    $this->assertRaw(json_encode(['message' => 'No authentication credentials provided.']));
 
     // Ensure that cURL settings/headers aren't carried over to next request.
     unset($this->curlHandle);