XZise added a comment.
Okay as it seems requests 2.5.4 will be fixed. There is an open pullrequest https://github.com/kennethreitz/requests/pull/2466 which allegedly does fix this bug so this might get closed then.
TASK DETAIL https://phabricator.wikimedia.org/T91394
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To: XZise Cc: pywikipedia-bugs, Aklapper, XZise, jayvdb