[Tomaž] uses the “hello world” example from ESP8266WebServer to explain. In it, the main loop essentially consists of calling server.handleClient() forever.

A web server such as the Apache HTTP Server or Nginx represent complex examples of the principle of least privilege. The software itself is installed by an administrative super-user with like ...

Your server has a single IP address, and multiple aliases (CNAMES) point to this machine in DNS. You want to run a web server for www.example.com and www.example.org on this machine.

If you've never deployed a website with the Apache web server, you're about to learn how. Every so often, taking a step back and going through the basics is good.