It's not an http server. Try with something like nc or telnet, and you should get an 'ok' response before it disconnects.
telnet -4 susam.net 8000 telnet -4 susam.net 8000> The other party can use whatever client they have to connect to port 8000 of my system, e.g., a web browser, nc HOST 8000, curl HOST:8000, or even, ssh HOST -p 8000, irssi -c HOST -p 8000, etc.
> curl -v --http0.9 susam.net:8000