fix path error at http2

vtqe/tools/http.go

@@ -171,6 +171,9 @@ func ReadFolder(w http.ResponseWriter, r *http.Request, fullpath string, isroot
 	if !isroot {
 		w.Write([]byte(fmt.Sprintf("<p><a href='%s'>%s</a>  %s</p>\n", "..", "..", "上层文件夹")))
 	}
+	if r.URL.Path == "/" {
+		r.URL.Path = ""
+	}
 	for _, v := range dir {
 		if v.Name() != "." || v.Name() != ".." {
 			if !v.IsDir() {