diff --git a/library/think/Request.php b/library/think/Request.php
index 5f05b916..9d215bb5 100644
--- a/library/think/Request.php
+++ b/library/think/Request.php
@@ -1342,6 +1342,9 @@ class Request
      */
     public function host()
     {
+        if (isset($_SERVER['HTTP_X_REAL_HOST'])) {
+            return $_SERVER['HTTP_X_REAL_HOST'];
+        }
         return $this->server('HTTP_HOST');
     }