Request.ServerVariables["SERVER_NAME"] is always localhost

I'm developing an ASP.NET 3.5 application with Visual Studio 2008. My default page has some redirection code in the Page_Load method: ``` protected void Page_Load(object sender, EventArgs e) { string sname = Request.ServerVariables["SERVER_NAME"].ToLower(); if (sname.ToLower().Contains("intranet")) { Response.Redirect("/intranet/Default.aspx"); } else if ((sname.ToLower().Contains("extranet"))) { Response.Redirect("/extranet/Default.aspx"); } else { Response.Redirect("/web/Default.aspx"); } } ``` I've modified my hosts file so that intranet and extranet redirect to my local machine. ``` 127.0.0.1 intranet 127.0.0.1 extranet ``` I then type the URL http://extranet in my browser. However, the problem is that the server variable value returned from Request.ServerVariables["SERVER_NAME"] is always "localhost" and not "extranet" Any help on how to get the right value? Many thanks