diff --git a/chapter24/src/main/resources/static/index.html b/chapter24/src/main/resources/static/index.html
index 2f29cc5..40bf1ba 100644
--- a/chapter24/src/main/resources/static/index.html
+++ b/chapter24/src/main/resources/static/index.html
@@ -36,7 +36,7 @@
 
 <script type="text/javascript">
     $(document).ready(function(){
-        var urlPrefix ='ws://127.0.0.1:8080/chat-room/';
+        var urlPrefix ='ws://localhost:8080/chat-room/';
         var ws = null;
         $('#btn_join').click(function(){
             var username = $('#in_user_name').val();