Update to drupal 8.0.0-rc1. For more information, see https://www.drupal.org/node/2582663

vendor/symfony/http-foundation/README.md

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+HttpFoundation Component
+========================
+
+HttpFoundation defines an object-oriented layer for the HTTP specification.
+
+It provides an abstraction for requests, responses, uploaded files, cookies,
+sessions, ...
+
+In this example, we get a Request object from the current PHP global
+variables:
+
+```php
+use Symfony\Component\HttpFoundation\Request;
+use Symfony\Component\HttpFoundation\Response;
+
+$request = Request::createFromGlobals();
+echo $request->getPathInfo();
+```
+
+You can also create a Request directly -- that's interesting for unit testing:
+
+```php
+$request = Request::create('/?foo=bar', 'GET');
+echo $request->getPathInfo();
+```
+
+And here is how to create and send a Response:
+
+```php
+$response = new Response('Not Found', 404, array('Content-Type' => 'text/plain'));
+$response->send();
+```
+
+The Request and the Response classes have many other methods that implement
+the HTTP specification.
+
+Loading
+-------
+
+If you are not using Composer but are using PHP 5.3.x, you must add the following to your autoloader:
+
+```php
+// SessionHandlerInterface
+if (!interface_exists('SessionHandlerInterface')) {
+    $loader->registerPrefixFallback(__DIR__.'/../vendor/symfony/src/Symfony/Component/HttpFoundation/Resources/stubs');
+}
+```
+
+Resources
+---------
+
+You can run the unit tests with the following command:
+
+    $ cd path/to/Symfony/Component/HttpFoundation/
+    $ composer install
+    $ phpunit