[WTK] Multipart form post progress?

Without going into too much detail about last night's excursion into the
depths of VisualWave request handling, here's a problem I'm trying to solve
and maybe (just maybe) there's somebody out there who may have some
suggestions. To implement the fancy file upload component I have going with
Seaside+Scriptaculous, I have browser do a post with a multiform data while
another process in the same browser polls for current upload progress. It
all works quite well (with fake progress), except now I can't find a way of
telling what the actual progress of an upload is from a separate request. It
appears that Wave processes the whole incoming stream from the socket before
it passes it off to the mime reader, but so far I was unable to find exactly
where it happens so I could keep track of useful progress there versus the
'content-length' reported in the headers.

Any clues would be appreciated,

Cheers!

-Boris

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