REST on SOA

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REST is most appropriate in HTTP-centric situations where the additional capabilities of SOAP-based interactions don't justify the additional overhead and complexity that SOAP introduces. Because the Web runs on HTTP, many Web-centric interactions lend themselves to REST-based approaches. It is important to keep in mind, however, that REST alone isn't an architecture, and thus doesn't provide, say, the governance and loose coupling that SOA provides. That being said, there's no reason why you wouldn't build REST-based services in the SOA context in those situations that call for such services.