Implementing fastcgi is a lot of fun, and by far not the hardest protocol out there. It's certainly easier than HTTP/1.1, HTTP/2, and (elder gods have pity on u

Implementing fastcgi is a lot of fun, and by far not the hardest protocol out there. It's certainly easier than HTTP/1.1, HTTP/2, and (elder gods have pity on us) HTTP/3. So if you don't have access to a library that does it for you, going by the spec will get you there.