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diff --git a/vendor/symfony/http-kernel/EventListener/FragmentListener.php b/vendor/symfony/http-kernel/EventListener/FragmentListener.php
new file mode 100644
index 000000000..ad6349286
--- /dev/null
+++ b/vendor/symfony/http-kernel/EventListener/FragmentListener.php
@@ -0,0 +1,115 @@
+<?php
+
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <fabien@symfony.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Symfony\Component\HttpKernel\EventListener;
+
+use Symfony\Component\HttpFoundation\Request;
+use Symfony\Component\HttpKernel\Event\GetResponseEvent;
+use Symfony\Component\HttpKernel\KernelEvents;
+use Symfony\Component\HttpKernel\Exception\AccessDeniedHttpException;
+use Symfony\Component\HttpKernel\UriSigner;
+use Symfony\Component\EventDispatcher\EventSubscriberInterface;
+
+/**
+ * Handles content fragments represented by special URIs.
+ *
+ * All URL paths starting with /_fragment are handled as
+ * content fragments by this listener.
+ *
+ * If throws an AccessDeniedHttpException exception if the request
+ * is not signed or if it is not an internal sub-request.
+ *
+ * @author Fabien Potencier <fabien@symfony.com>
+ */
+class FragmentListener implements EventSubscriberInterface
+{
+    private $signer;
+    private $fragmentPath;
+
+    /**
+     * Constructor.
+     *
+     * @param UriSigner $signer       A UriSigner instance
+     * @param string    $fragmentPath The path that triggers this listener
+     */
+    public function __construct(UriSigner $signer, $fragmentPath = '/_fragment')
+    {
+        $this->signer = $signer;
+        $this->fragmentPath = $fragmentPath;
+    }
+
+    /**
+     * Fixes request attributes when the path is '/_fragment'.
+     *
+     * @param GetResponseEvent $event A GetResponseEvent instance
+     *
+     * @throws AccessDeniedHttpException if the request does not come from a trusted IP.
+     */
+    public function onKernelRequest(GetResponseEvent $event)
+    {
+        $request = $event->getRequest();
+
+        if ($this->fragmentPath !== rawurldecode($request->getPathInfo())) {
+            return;
+        }
+
+        if ($request->attributes->has('_controller')) {
+            // Is a sub-request: no need to parse _path but it should still be removed from query parameters as below.
+            $request->query->remove('_path');
+
+            return;
+        }
+
+        if ($event->isMasterRequest()) {
+            $this->validateRequest($request);
+        }
+
+        parse_str($request->query->get('_path', ''), $attributes);
+        $request->attributes->add($attributes);
+        $request->attributes->set('_route_params', array_replace($request->attributes->get('_route_params', array()), $attributes));
+        $request->query->remove('_path');
+    }
+
+    protected function validateRequest(Request $request)
+    {
+        // is the Request safe?
+        if (!$request->isMethodSafe(false)) {
+            throw new AccessDeniedHttpException();
+        }
+
+        // is the Request signed?
+        // we cannot use $request->getUri() here as we want to work with the original URI (no query string reordering)
+        if ($this->signer->check($request->getSchemeAndHttpHost().$request->getBaseUrl().$request->getPathInfo().(null !== ($qs = $request->server->get('QUERY_STRING')) ? '?'.$qs : ''))) {
+            return;
+        }
+
+        throw new AccessDeniedHttpException();
+    }
+
+    /**
+     * @deprecated since version 2.3.19, to be removed in 3.0.
+     *
+     * @return string[]
+     */
+    protected function getLocalIpAddresses()
+    {
+        @trigger_error('The '.__METHOD__.' method is deprecated since version 2.3.19 and will be removed in 3.0.', E_USER_DEPRECATED);
+
+        return array('127.0.0.1', 'fe80::1', '::1');
+    }
+
+    public static function getSubscribedEvents()
+    {
+        return array(
+            KernelEvents::REQUEST => array(array('onKernelRequest', 48)),
+        );
+    }
+}