[fsckboy]

the HTTP/3 standard for servers is not backward compatible with HTTP/2 servers, it is backward compatible with HTTP/2 clients. And vice versa

And therefore, an HTTP/2 server calling itself compatible with HTTP/3 clients is OK

[samtho]

It might be OK on a technical level, but my concern is where someone is showing off a project they used to supposedly learn how to implement HTTP/3 but only goes far enough to use an HTTP/2 implementation because fully implementing 3 is too complex or not worth it.