Security issue – HttpResponse.Redirect in Umbraco appear trace information

If use below solution to implement redirection on your site.

• Telling a page to redirect to an external URL

• umbracoRedirect

Please ensure hack ~/default.aspx to disable the trace parameter.
<%@ Page language="c#" Codebehind="default.aspx.cs" AutoEventWireup="True" Inherits="umbraco.UmbracoDefault" trace="false" validateRequest="false" %>
Please use web debugging tool to check your umbraco site , e.g. Fiddler
You can fellow below step .

1. open Fiddler

2. visit the redirect URL .  
3. in WebView tab , will appear all trace information , like Server Variables , Session State