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See here to know how to use 2-legged OAuth with OAuth 1.0 to secure a RESTful service.

OAuth 2.0

OAuth This specification defines OAuth2. OAuth 2.0 defines four roles:

1. Resource owner: An entity capable of granting access to a protected resource (e.g. end-user).
2. Resource server: The server hosting the protected resources, capable of accepting and responding to protected resource requests using access tokens.
3. Client: An application making protected resource requests on behalf of the resource owner and with its authorization.
4. Authorization server: The server issuing access tokens to the client after successfully authenticating the resource owner and obtaining authorization.

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