[maxk42]

h2o [1] is a web server and C library that not only supports http 1 & 2, but also usually tops the TechEmpower benchmarks [2].

[1] https://github.com/h2o/h2o

[2] https://www.techempower.com/benchmarks/

[ksec]

Is H20 being used in production?

[maxk42]

I believe Fastly CDN sponsors some of the development [citation needed]. Not sure if that means they use it in production or not, but I've been playing with it on some of my dev servers and so far it's amazingly stable and configurable.