Conditional redirect based on passed parameters...

That doesn't account for the specific domain, though, and I think the intent is that /page is whatever was sent to the original request as a uri. If that's the case, Phil, something like this should work:

when HTTP_REQUEST {
  if { [domain [HTTP::host] 2] eq "domain.com" } {
    HTTP::redirect "http://www.redirect-domain.com[HTTP::uri]"
  }
}