Wow, this is exactly what I've been looking for: lightweight, supports CONNECT and CONNECT-UDP with all three HTTP versions, and supports encrypted client hello. Thanks for the recommendation!

h2o is also one of the few servers to get resource prioritization correct for HTTP/2 and HTTP/3.

If resource prioritisation is new, a few references: https://www.youtube.com/watch?v=MV034VqHv5Q https://calendar.perfplanet.com/2022/http-3-prioritization-d... https://github.com/andydavies/http2-prioritization-issues

Agree and have been using it for many years for web sites we develop for customers. H3 support has been available for quite some time.

Support is also good and the developer is quite active.