[Twisted-Python] txsni + alpn + acme (letsencrypt)

[Daniel Holth]

Hello. Can you help me to learn to debug tls problems in twisted?

I was disappointed that txacme, an automatic way to get certificates for
twisted web, stopped working, so I'm trying to add a responder for the new
challenge type. It sends a special certificate if the CA negotiates acme
using alpn, proving domain control, then you get a certificate.

Seems to work with openssl s_client but letsencrypt says "no application
protocol". Anyone know where that error comes from?

https://github.com/glyph/txsni/pull/26
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