Hmm... It could be a bug in WWW::Mechanize, but a quick scan of the bug reports doesn't show this being reported before (though I might have missed it). It might also be a server fault. Have you tried posting the same data via another mechanism (like, via a browser)?

update: alternatively, can you make a smallish program that demonstrates the problem?

"What should it profit a man, if he should win a flame war, yet lose his cool?"

In reply to Re^3: www::mechanize long fields by Joost
in thread www::mechanize long fields by Anonymous Monk

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