diff --git a/var/Typecho/Request.php b/var/Typecho/Request.php
index eb1212ad..50fad8c5 100644
--- a/var/Typecho/Request.php
+++ b/var/Typecho/Request.php
@@ -237,7 +237,9 @@ class Typecho_Request
      */
     public static function isSecure()
     {
-        return (!empty($_SERVER['HTTPS']) && 'off' != strtolower($_SERVER['HTTPS'])) 
+        return (!empty($_SERVER['HTTP_X_FORWARDED_PROTO']) && !strcasecmp('https', $_SERVER['HTTP_X_FORWARDED_PROTO']))
+            || (!empty($_SERVER['HTTP_X_FORWARDED_PORT']) && 443 == $_SERVER['HTTP_X_FORWARDED_PORT'])
+            || (!empty($_SERVER['HTTPS']) && 'off' != strtolower($_SERVER['HTTPS']))
             || (!empty($_SERVER['SERVER_PORT']) && 443 == $_SERVER['SERVER_PORT'])
             || (defined('__TYPECHO_SECURE__') && __TYPECHO_SECURE__);
     }