Detect domain or URL in urlfilter_blocked.inc page

Is there a way to identify the domain or URL of the original request in the urlfilter_blocked.inc page under per-request policied for a forward web proxy?

There is code already (not sure if its built-in or part of customisations that were done before I came on baord) to display the session ID Number, the page category, the user agent string of the browser, and a few other things.

I have a couple of domains, that I've been asked to put a custom blocked message in place for. I'd liek to avoid having to create a custom category just for these domains.