Yeah, and it doesn't even have to be a query, it could be an idempotent effect. I think they'd be better off calling it IPOST (for idempotent post).

Edit: ah, they declare QUERY as "safe" meaning no side effects, for cacheability. My mistake.

> the term 'query' is already used to refer to http requests in general

In what circles is this the case? I sometimes colloquially refer to a GET request as a query, but definitely not so on a POST, PUT or DELETE.