Thanks! I understand your point, but a fork server is so simple I don't think there is much that can go wrong there, if it was serving more data I would be worried, but its meant to do a quick and short reply.
Fork Bombs are easier to pull off from the command line. Not so much with DOS. I would say that loading a large webserver for each request would use up more resources than a tiny C program. Thats the whole point of the post.
I would use Go for this service myself. Defending against abuse is hard whichever way one goes.