What is REST?

It is rather style or pattern of development resource-oriented web applications. Beauty of REST is that its really easy to understand and basically you are using REST everyday but may not noticing that. REST works on top of HTTP protocol, but is is not protocol itself. It seems to me that it actually appears with HTTP/1.1 but only with Roy Fieldingwork it became well understood, defined and attractive.

REST popularized by such applications as twitter, flickr, bloglines, technorati etc. And of cause, by Ruby On Railsframework.

REST vs. SOAP

Sure, REST is not first who approaches issue of using recourses in Web, it rather trendier new kind in a block. We know bunch of web technologies, SOAP, WSDL, ATOM, WS-*, WCF, ODATA and many many more.. So, what are the difference?

Major difference is that all above are protocols, but REST is style. This has pros and cons. Protocol’s are more strict and heavyweight, with a number of rules, formats etc. SOAP is using XML as data exchange format, REST could work any format depending on client needs. SOAP is using its own security model, REST relies on HTTP and web server security. SOAP requires tools, REST learning curve is small and less less reliance on tools. SOAP designed to handle distributed computing environments, REST assumes a point-to-point communication model.

But my opinion is simplicity always win against complexity. Key popularity of REST is because is simple, easy understand by developers and as a result – implemented in applications. My believe that SOAP and other heavyweight protocols will slightly die more and applications will be using REST.

 ASP.net MVC and REST

Developers of ASP.net MVC framework designed it to be REST compatible. In the level of framework, there is an URL routing system (System.Web.Routing) that allows you easily follow REST design principles. It gives you total control over your URL schema and its mapping to your controllers and actions, with no need to conform to any predefined pattern.

So, basically ASP.net MVC web applications development is: create a controller class (LoginController for instance), implement number of actions (Index, CheckCredentials) and map those actions to particular URL. For instance http://mysite.com/login mapped to LoginController.Index method, that handles GET request from server and return View, containing Login form. http://mysite.com/login/check mapped toLoginController.CheckCredentialsmethod, that handles POST and checks users credentials.

It is much more easier to create web applications API’s with MVC framework. TheActionResult is polymorphic, so it could return HTML, JSON, XML results (and you are free to implement own ActionResult, for any format you might need).

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