Merge pull request facebookarchive#114 from moisadoru/master

Support for multiple chained forward proxies in getHttpHost()

Author: gfosco

src/base_facebook.php

@@ -1182,7 +1182,10 @@ protected function getUrl($name, $path='', $params=array()) {
 
   protected function getHttpHost() {
     if ($this->trustForwarded && isset($_SERVER['HTTP_X_FORWARDED_HOST'])) {
-      return $_SERVER['HTTP_X_FORWARDED_HOST'];
+      $forwardProxies = explode(',', $_SERVER['HTTP_X_FORWARDED_HOST']);
+      if (!empty($forwardProxies)) {
+        return $forwardProxies[0];
+      }
     }
     return $_SERVER['HTTP_HOST'];
   }