traping a request termination from a browser

From: John Michael (johnm_at_aiamail.com)
Date: 11/29/03 

Date: Sat, 29 Nov 2003 04:23:32 -0600

Say I were to write a script that would server a large file through a web
interface and record somewhere the file size.

Is it possible for me to know if the user downloading the file terminated
the connection early so that I could record the correct size?

How would I trap this situation so that I could do some sort of roll back or
clean up if this were to happen?

Thanks
JM

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