You read the article? The first thing he does is call POX "level 0" and "the swamp".

Generally, real http APIs from companies like Amazon, Flickr, Twitter, etc. are POX-RPC APIs, the idea is that you're exposing operations, not data structures.

REST is a castles-in-the-air exercise in exploring the dark corners of the http specification and exposing data directly instead of exposing operations on the data.