Read headers before url rewrite

[ryanstout]

Is it possible to read the request headers before rewriting the url? (Specifically, I'm wanting to look at the referer header before rewriting the urls).

Thanks!

[robjcaskey]

I'd like to +1 this, making url_rewrite(request) into url_rewrite(request, req_url) so that it matches the signature for response seems like a nice improvement.