How to design a REST API?

API Security Checklist

Checklist of the most important security countermeasures when designing, testing, and releasing your API

HTTP API design guide extracted from work on the Heroku Platform API

HTTP API design guide extracted from work on the Heroku Platform API

Architectural Styles and the Design of Network-based Software Architectures

Roy Fielding's dissertation defining REST

Enterprise Integration Using REST

Discusses the constraints and flexibility that you have with nonpublic APIs, and lessons learned from doing large scale RESTful integration across multiple teams