RFC 6749: The OAuth 2.0 Authorization Framework

RFC 6749 establishes the OAuth 2.0 Authorization Framework, a standardized protocol that allows third-party applications to access protected online resources without requiring the user's private passwords. By introducing a dedicated authorization layer, the framework separates the roles of the resource owner, the client application, and the server, utilizing access tokens to grant specific, limited permissions. The document outlines four primary authorization grant types—including the authorization code and implicit flows—to accommodate different software environments such as web, mobile, and native applications. Beyond the core mechanics of token issuance and redirection, the text emphasizes security best practices, mandate the use of transport-layer security, and provides an extensible architecture designed to evolve alongside modern web standards.

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