Cory Benfield added the comment:

Updating to mention a concern with ALPN implementation. HTTP/2 requires that a 
cipher with AEAD be negotiated. However, it also allows for offering a wider 
range of cipher suites: if an AEAD cipher is not present, this will allow 
fallback to HTTP/1.1.

There's some interplay between ALPN and cipher selection here. We'll want to 
ensure that either ALPN negotiation can inform cipher selection or vice-versa, 
or writing a Python HTTP/2 server will get tricky fast.

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<http://bugs.python.org/issue20188>
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