Calling RESTful Services from Apex
Twitter, Facebook, Yahoo!, Google, and countless others provide REST APIs for their services. REST is designed for lightweight clients, those running inside Web browsers or other scripting environments. Rather than generating static language bindings from a metadata description, as found with WSDL in the Web services world, the REST approach is dynamic. Its emphasis is on a concise syntax for URLs that represent resources and the use of HTTP methods to describe actions on those resources.
REST services usually return data in XML or JSON format, with the format specified by the caller of the service. JSON stands for JavaScript Object Notation, a standard format for representing JavaScript objects as strings. ...
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