That's surprisingly good. And it turns out that if search Google for my server's IP, I'll find even more things I host, albeit through listings on a bunch of random semi-garbage sites.

Try passing 1.1.1.1 if you want a no-js version of the infinitely scrolling website.

That’s pretty cool. They must be buffering output themselves and sending raw http responses over the socket.

Interesting. I used this to discover that someone is pointing their (pretty decent) domain name towards my server. I won't, but I could theoretically make it display anything of my choosing.

Is it a private server? It might be a shared host so that many domains are pointing to the same IP.

Yes, private server with dedicated IP.