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

vendor/symfony/http-kernel/Exception/TooManyRequestsHttpException.php

@@ -0,0 +1,40 @@
+<?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\Exception;
+
+/**
+ * TooManyRequestsHttpException.
+ *
+ * @author Ben Ramsey <ben@benramsey.com>
+ *
+ * @see http://tools.ietf.org/html/rfc6585
+ */
+class TooManyRequestsHttpException extends HttpException
+{
+    /**
+     * Constructor.
+     *
+     * @param int|string $retryAfter The number of seconds or HTTP-date after which the request may be retried
+     * @param string     $message    The internal exception message
+     * @param \Exception $previous   The previous exception
+     * @param int        $code       The internal exception code
+     */
+    public function __construct($retryAfter = null, $message = null, \Exception $previous = null, $code = 0)
+    {
+        $headers = array();
+        if ($retryAfter) {
+            $headers = array('Retry-After' => $retryAfter);
+        }
+
+        parent::__construct(429, $message, $previous, $headers, $code);
+    }
+}