Migrate RainLoop Webmail to use Facebook Graph API instead of FQL

rainloop/v/0.0.0/app/libraries/GuzzleHttp/Event/HeadersEvent.php

@@ -0,0 +1,39 @@
+<?php
+
+namespace GuzzleHttp\Event;
+
+use GuzzleHttp\Message\ResponseInterface;
+use GuzzleHttp\Adapter\TransactionInterface;
+
+/**
+ * Event object emitted after the response headers of a request have been
+ * received.
+ *
+ * You may intercept the exception and inject a response into the event to
+ * rescue the request.
+ */
+class HeadersEvent extends AbstractRequestEvent
+{
+    /**
+     * @param TransactionInterface $transaction Transaction that contains the
+     *     request and response.
+     * @throws \RuntimeException
+     */
+    public function __construct(TransactionInterface $transaction)
+    {
+        parent::__construct($transaction);
+        if (!$transaction->getResponse()) {
+            throw new \RuntimeException('A response must be present');
+        }
+    }
+
+    /**
+     * Get the response the was received
+     *
+     * @return ResponseInterface
+     */
+    public function getResponse()
+    {
+        return $this->getTransaction()->getResponse();
+    }
+}