Review the proposed patch then download it to apply it manually or execute the following command from the repository root directory:
curl https://fabbot.io/patch/symfony/symfony/27309/ab86f43d7877a906d22713d7fae793f2076ce3f6/license.diff | patch -p0
diff -ru src/Symfony/Component/HttpKernel/HttpCache/HttpCache.php src/Symfony/Component/HttpKernel/HttpCache/HttpCache.php
--- src/Symfony/Component/HttpKernel/HttpCache/HttpCache.php 2018-06-19 13:14:15.516000000 +0000
+++ src/Symfony/Component/HttpKernel/HttpCache/HttpCache.php 2018-06-19 13:14:19.681000000 +0000
@@ -5,6 +5,15 @@
*
* (c) Fabien Potencier <[email protected]>
*
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <[email protected]>
+ *
* This code is partially based on the Rack-Cache library by Ryan Tomayko,
* which is released under the MIT license.
* (based on commit 02d2b48d75bcb63cf1c0c7149c077ad256542801)