Aborted POST transfers?

Here's something novel... The fetch is being
done using a *POST* request (IBM is doing strange things).
If you want to try it yourself, go to:

        http://service.software.ibm.com/dl/clubodw/od12w-l

Look for od12wbk.exe
Which is the file I've been using as a testcase.

Anyway, when I try to download one of the smaller files, it works
(though, sadly, squid doesn't cache it, because it's a POST request
(what idiot came up with that idea, I don't know)).
When I try to download one of the larger files (like od12wbk.exe)
there is a high probability that the transfer will terminate
prematurely. It almost looks as if it is somehow timing related
(like a POST request shouldn't take longer than x minutes or similar).

In the log files I cannot find *any* record or indication of the termination
being premature.
Is there some configvariable I need to increase?

-- 
Sincerely,                                                          srb@cuci.nl
           Stephen R. van den Berg (AKA BuGless).
He did a quarter of the work in *half* the time!