Editor's note: This post was originally published in January 2018 and has been revamped and updated for accuracy and comprehensiveness. The latest update was in October 2022. OAuth2, often combined with OpenID-Connect (OIDC), is a popular authorization framework that enables applications to protect resources from unauthorized access. It delegates user authentication to an authorization service, which then authorizes third-party applications to access the protected resources on the user’s behalf. OAuth2 provides authorization flows for both web and mobile applications.
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