https://bugzilla.wikimedia.org/show_bug.cgi?id=72047
--- Comment #15 from Mpaa mpaa.wiki@gmail.com --- Works for me.
Pywikibot: pywikibot-core.git (bc34a4a, g4328, 2014/10/20, 18:56:56, OUTDATED) Release version: 2.0b2 Python: 2.7.6 (default, Mar 22 2014, 22:59:38) unicode test: ok httplib2 version: 0.9
The only difference I can spot is httplib2. No idea if it could explain it. Might be worth while updating it and retry.