diff --git a/http/src/Response.php b/http/src/Response.php
index 64f2f5a..58837f5 100644
--- a/http/src/Response.php
+++ b/http/src/Response.php
@@ -10,11 +10,11 @@ public static function ok($text,$data = [],$append = null){
         return self::response200($text,$data,$append);
     }
 
-    public static function badRequest($text,$dir = null){
+    public static function badRequest($text,$dir = ''){
         return self::response400($text,$dir);
     }
 
-    public static function movedPermanently($text,$dir = null){
+    public static function movedPermanently($text,$dir = ''){
         return self::response301($text,$dir);
     }
 
@@ -22,11 +22,11 @@ public static function unauthorized(){
         return self::response401();
     }
 
-    public static function notFound($text,$dir = null){
+    public static function notFound($text,$dir = ''){
         return self::response404($text,$dir);
     }
 
-    public static function notAllowed($text,$dir = null){
+    public static function notAllowed($text,$dir = ''){
         return self::response405($text,$dir);
     }