The documentation mentions that HTTP/2 requires at least TLSv2: https://github.com/pgjones/hypercorn/blob/6cb9c5cc11c5372d59ffb8348345e308bc2f1067/docs/discussion/http2.rst?plain=1#L15 That version doesn't exist (yet) and [the standard mentions TLS 1.2 as the minimum requirement](https://datatracker.ietf.org/doc/html/rfc9113#section-9.2).
The documentation mentions that HTTP/2 requires at least TLSv2:
hypercorn/docs/discussion/http2.rst
Line 15 in 6cb9c5c
That version doesn't exist (yet) and the standard mentions TLS 1.2 as the minimum requirement.