Let's assume I want (for fun at start) to play with some new DSL (domain specific language) idea. And I really want its user[s] (probably only me at first) to interact thru a web interface. I'll probably implement it in C++ (probably using LLVM).

Should I use an HTTP server library (like libonion or microhttpd) to talk directly HTTP or should I use FastCGI?

In particular, I am noticing that several recent web frameworks (Opa, Ocsigen, ...) do not have any FastCGI interface but only HTTP one....

So my feeling is that FastCGI is really out of fashion....

Any opinions on that? Do you know recently started project using FastCGI ? (and what about SCGI?)