This code makes a permanent redirect from any other hostname to the specified hostname to the same page. I usually use to ensure that Google (and others) does not index the same content twice.

In effect: 

https://domain.dk:3837/mysubpage.aspx redirects to https://www.domain.dk/3837/mysubpage.aspx

    <%
            string primaryAddr = "www.whatever.dk";
            var uri =  HttpContext.Current.Request.Url;
        
            if (uri.Host != primaryAddr || uri.Host.Contains(".local"))
            {
                string newurl = uri.Scheme + @"://" + primaryAddr;
  
                if (uri.Port != 80)
                    newurl += ":" + uri.Port;
  
                newurl += uri.PathAndQuery;
               HttpContext.Current.Response.Status = "301 Moved Permanently";
               HttpContext.Current.Response.AddHeader("Location",newurl);
  }
%>

Does this exsist in a package already or should I make it?

/Jesper