Cory Benfield added the comment:

Yup. So for Requests at least, the fix is easy: because OpenSSL kindly just 
quietly ignores cipher suites it doesn't know about we can unconditionally add 
it to the requests/urllib3 cipher string. In the first instance we'll just do 
it statically, and then we can consider down the road whether 
Python/cryptography could give us a way to ask whether we should prefer 
ChaCha20 over AES-GCM.

In the short term, my expectation is that we'd still want to prioritise AES-GCM 
over ChaCha20 in Requests: is there any reason to think that I'm wrong there?

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue27766>
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