How to REST?

Today I tried to explain REST (as in REpresentational State Transfer, not near sleep) to a manager and why some of the services deployed at the organization he was working for wasn't REST. While there isn't a formalized spec, there is a dissertation by the Roy Fielding, who came up with the REST-principles as a set of principles that guided him while shaping the HTTP 1.1 standard which only recently got a successor with version 2.0… REST is a set of principles/guidelines that are very stable & predictable. It is also very simple, and theirin lies both its strength, and the sometimes too loose application of its principles.

Apparently many developers didn't get 'the web' (HTTP) right, hence REST was developed as a basic set of principles to explain how HTTP is supposed to work. This is a list of my favourite parts, also based on some secondary resources.

Some key concepts.

REST is about …