Implemented via several dozen geographically distributed 1U servers with 10 or 100GbE network interfaces, and anycast DNS. You could do it pretty much the same as anycast DNS recursive resolvers, but all sharing the same hostname, IP and TLS keys.
You can totally get your own asn, acquire a /24 of ipv4 space, and announce as anycast your netblock containing the goatse httpd from multiple geographic locations.
