See

http://mail.python.org/pipermail/python-dev/2002-June/025289.htm

and

http://ppewww.ph.gla.ac.uk/~flavell/www/post-redirect.html

There is also an issue with the 302 handler (also
discussed there).

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Agreement seems to have been reached on this in the
discussion of bug #549151.  There is a patch there, but only
the change to the 303 case should be applied, not 301.  The
docs need to state that 303 is automatically handled, too.

Jeremy Hylton, from bug #549151:
> I agree with your interpretation that urllib2 raise an
> HTTPError to signal "request confirm" because an HTTPError
> is also a valid response that the user could interpret.
> But of urllib, an HTTP error doesn't contain a valid
> response.  The change would make it impossible for the
> client to do anything if a 301 response is returned from a
> POST.  That seems worse than doing the wrong.

John Lee, in reply:
> As for urllib.py, I see the problem.  303 should still be
> added, though, since that poses no problem at all.


John

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Deferring to discussion for patch 549151.