I can't easily reproduce your setup, but you might want to make sure that you have the latest versions of both, LWP and WWW::Mechanize, as there were changes that added the GET after POST redirect behaviour "recently (LWP 2.75 I believe).

In reply to Re: WWW::Mechanize & 302/405 by Corion
in thread WWW::Mechanize & 302/405 by afabbro

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