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I've attached a patch -- was simpler than I thought.

I think this is in compliance with RFC 2616.  It's also
simple for clients to inherit from HTTPRedirectHandler and
override redirect_request if, for example, they know they
want all 302 POSTs to be redirected as a GET, which removes
the need for mixing redirection code with normal client code
even when the server doesn't follow the RFC (if the server
expects a 302 POST to be redirected as a GET, for example).
Note that I had to add a method, named 'method', to the
Request class, for maintainability (it's possible that
urllib2 may be able to do methods other than GET and POST in
future).

Possibly redirect_request should take fewer parameters.

John