Using asm is a bit extreme and can lead to many problems. The toy project used is quite limited anyway; you could use one of the tiny C httpds and still get the size under 15k for similar functionality.

Would anyone use this in production? I doubt so. You want a reliable battle-tested solution. Nginx can be compiled to 500kb without OpenSSL; if you need https then it's just a few megabytes, I find it acceptable for non-embedded solutions like containers.