[twerquie]

> It's telling of what exactly?

That the candidate favors transport-agnostic APIs or has limited familiarity with HTTP. One easy follow-up: "I notice you decided to call the method createUser..." and you've learned something concrete. They'll either stare blankly or discuss their preference for JSON-RPC or SOAP or whatever.

> And as far as I know, web apps with true RESTful interfaces are somewhat rare.

It's common to take advantage of HTTP's verb syntax.