I host Web Services on my Apple II. (Original Apple II, not a II+)
I wanted to see if I could make modern REST Web Services using only (or mostly) pre-1980 technologies. I'm using the serial port for communications instead of an Apple II Ethernet adapter, because I'm trying to use as much standard and authentic old Apple hardware as possible.
I have an additional embedded computer (Pico-ITX running Linux) that actually handles the HTTP and translates that into simple messages sent over the serial port.
I wrote the Apple II software in assembly. It supports the PUT, GET, DELETE, and CATALOG methods for objects that live as files on the 5.25" drives. (It uses DOS 3.3)
I use the Apple II Web Services to store all my phone numbers, passwords, contacts, todo list, schedule, personal records, favorite bookmarks, lists of things, etc. And I can access this data from any browser or from a phone browser. (It's password protected). I press a button on the browser an miles away a floppy drive kicks on.
The Apple II has been running 24/7 for over a year now without fail.
Currently, the embedded computer is handling automated backups, caching, and cleaning up files on the drives (by sending commands to the Apple II), but I want to move that function into the Apple II as well. (by adding more drives)
It's all old-school....and yet serves a very important modern function!