Rewrite client browser URL without redirect

I suppose you can do the following

 
  when HTTP_REQUEST {  
     if {[HTTP::host] eq "www.example.com" } {  
      HTTP::header replace Host "www2.example.com"  
      }  
  }  
  

This update will only affect the request to the pool member. The client will not see the update unless the web application uses the requested host header value to generate response headers and/or content.

Does that help?

Bhattman