How to define a RESTful Web Services?

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Overview

Representational State Transfer (ReST) has gained widespread acceptance across the Web as a simpler alternative to SOAP- and Web Services Description Language (WSDL)-based Web services.

The resources are acted upon by using a set of simple, well-defined operations. The REST architectural style constrains an architecture to a client/server architecture and is designed to use a stateless communication protocol, using HTTP/HTTPS.
 
The system allows a series of RESTful services to be defined. The ReST service will normally return a JSON object