I didn't want to state why C and not "X" because the comments would have devolved into an all out language war.

The underlying libraries you use tend to be in C anyway, so it simplifies things to just use them with their native interface, and not having to add another language runtime and its idiosyncrasies.

I can never figure out why everything isn't in C. :|

Yesterday or so there was a post about using Zig. When I read it I thought that using C would work equally well.

I'm old enough to remember when the OKCupid guys wrote their own webserver in C++!

I took the concept of "slots" in requests, from it: https://github.com/okws/okws