Determining the "original" request URL from within a tile

[Rick Mann]

Hi. We have a tiles-based webapp. Buried down deep in a tile that gets 
reused in a few different pages is the need to render a link back to 
the current request, with a parameter added. This acts as a switch to 
re-render the page a bit differently.

Unfortunately, request.getRequestURL() reflects the included file (in 
this case, the layout JSP used) and NOT the request in the address bar 
of the browser.

Also available to the tile are SOME of the request parameters (all of 
the names are there, but they have null values, and not the values 
specified in the original request).

What's the best way to get at this "original" information?
TIA,
--
Rick
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