unix sockets probably broken for requests 2.12.2

[graingert]

http+unix URIs will no longer have URL preparation applied, including - but not limited to - converting the params dict into query parameters

see https://github.com/kennethreitz/requests/issues/3734

[erikbern]

can you explain what the problem is? what is the fix?

[stale]

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