HEADER Rewrite without redirect trusted site Pop-up error on Internet Explorer..

I have tried this below and it still does not work. Can anyone help?

1. Rewrite without Redirecting the incoming URL request from http://www.URL1.com to https://www.URL2.com

2. After the rewrite, the user will login to the web page, so all request/HTTP post after that goes to the new URL2 link.

I am still getting the "trusted site" pop-up errors and am wondering if this has something to do with how the redirect works and the

nature of Internet Explorer....

when HTTP_REQUEST {       
       Check the host header value (set to lowercase)     
  switch [string tolower [HTTP::host]] {        
   "www.URL1.com" {           
 Replace the Host header   
HTTP::header replace Host "www.URL2.com"   

} else {
      HTTP::redirect "https://[HTTP::host][HTTP::uri]"

      } 
   }
}