Stealth Redirection or URL Hiding

update- I was able to get the look we needed. once we proxy hosted the news.xxx.com I could then send the traffic to the pool.

when HTTP_REQUEST {
    switch -glob [string tolower [HTTP::host][HTTP::path]] {
        "www.abc.com/news*"  {
            pool news.xxx.com-pool
        }
        default {
            pool www.abc.com-pool
        }
    }
}

now I have to work with the 3rd party to fix the uri they now recieve. they now get stuff to news.xxx.com/news and they dont have that directory(but the core site is there) and also once anyone clicks a link on that site it would change there URL to the real site. But I think I might be able to fix that with some general irule redirects.