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copied!<p>I'd start with <a href="http://www.ics.uci.edu/~fielding/pubs/dissertation/rest_arch_style.htm" rel="nofollow noreferrer">chapter 5</a> of Roy Fielding's dissertation. There are a few basic principles:</p> <ul> <li>Resources: A resource could be typically something that you expose to the outside world as a part of your service. The emphasis is on identifying the resources (e.g: Book, UserList, CalculateDistance) </li> <li>URI: Give every resource an identifier (e.g: example.com/books/7654)</li> <li>Uniform interface: Use standard methods like GET, PUT. POST, DELETE, HEAD, OPTIONS</li> <li>Representations: A resource can have multiple representations. For example, a GET on a book can return a PDF of that book's content, a HTML of the content and for that matter even a GIF with the book cover and so on. A representation is essentially a collection of all the data and markup.</li> <li>Hypermedia: This one, in my opinion, is a very important principle. Implementation of this principle takes your application far ahead of the regular CRUD-like definitions the REST-style is boxed into. HATEOAS is the acronym which stands for Hypermedia as the engine of application state. When you click on a link or submit a form you are changing the state of the application, that's happening via hyperlinks (or hypermedia). There is very little coupling between a server and a client. A client navigates through the application via the links provided by the server. (there is a lot of discussion in the blogosphere on this priniciple ...) [Also look at <a href="http://restfulie.caelumobjects.com/" rel="nofollow noreferrer">Restfulie</a>]</li> </ul> <p>I have recently <a href="https://stackoverflow.com/questions/2840275/whats-the-best-source-for-learning-how-to-create-restful-apis-in-java/2842069#2842069">answered a question</a> on good resources to learn REST, could be helpful.</p> <p>I'm not familiar with Rails, so not addressing that part of the question.</p>

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