Merge branch '2.3' into 2.7

Author: xabbuh

book/http_cache.rst

@@ -912,7 +912,7 @@ Here is how you can configure the Symfony reverse proxy to support the
             if ('127.0.0.1' !== $request->getClientIp()) {
                 return new Response(
                     'Invalid HTTP method',
-                    Response::HTTP_BAD_REQUEST
+                    400
                 );
             }
 

book/testing.rst

@@ -277,7 +277,7 @@ document::
         $this->assertTrue($client->getResponse()->isNotFound());
         // Assert a specific 200 status code
         $this->assertEquals(
-            200, // or Symfony\Component\HttpFoundation\Response::HTTP_OK
+            200,
             $client->getResponse()->getStatusCode()
         );