fix #1157

var/Typecho/Request.php

@@ -527,7 +527,7 @@ class Request
      *
      * @return string
      */
-    private function getUrlPrefix(): string
+    public function getUrlPrefix(): string
     {
         if (empty($this->urlPrefix)) {
             if (defined('__TYPECHO_URL_PREFIX__')) {

var/Typecho/Widget/Request.php

@@ -188,6 +188,16 @@ class Request
         return $this->request->getPathInfo();
     }
 
+    /**
+     * 获取url前缀
+     *
+     * @return string
+     */
+    public function getUrlPrefix(): string
+    {
+        return $this->request->getUrlPrefix();
+    }
+
     /**
      * 根据当前uri构造指定参数的uri
      *