It's great to see people still using C to make web servers !

But can you clarify what are the "state-of-the-art technologies and solutions?"

I just skim the project and think this is not a lot better in term of performance than other servers like Nginx or H2O. There is also Lwan[0], which uses epoll too and has a cool coroutine, router implementation (I implemented a framework for Kotlin/Native on top of it[1]).

Another framework having really fast and fancy technologies in it is Seastar[2]. I think implementing kernel bypass, AIO, DPSK stuff makes it the fastest web server around currently. May be you can try to push the boundary with those things, SPDK, aggressive polling, fast router...?

[0]: https://github.com/lpereira/lwan [1]: https://github.com/KwangIO/kwang [2]: https://github.com/scylladb/seastar