HTTP+HTML+CSS (and Javascript) is the REST API used to communicate between clients (browsers) and servers. It's not a coincidence, it was the point of the thesi

HTTP+HTML+CSS (and Javascript) is the REST API used to communicate between clients (browsers) and servers. It's not a coincidence, it was the point of the thesis defining REST to formalize and improve the Web. See: https://www.ics.uci.edu/~fielding/pubs/dissertation/introduction.htm https://www.ics.uci.edu/~fielding/pubs/dissertation/introduc... In terms of what we think of as an API today, my favorite is SWORD: https://sword.cottagelabs.com https://sword.cottagelabs.com In particular, it does not define any URL scheme, client applications are expected to read links from the XML (for v1 and v2) or JSON (for v3) body.