Refresh Token Life Cycle and Rotation
Explore how refresh tokens work to maintain user sessions without repeated logins by securely issuing new access tokens. Understand the refresh token lifecycle, including issuance, rotation, reuse detection, and revocation. This lesson helps you build secure OAuth 2.0 applications that balance security and user experience.
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Access tokens are intentionally short-lived to minimize the attack window if they are stolen. However, forcing users to repeatedly log in every time an access token expires disrupts their experience and creates friction. The refresh token grant solves this problem by allowing client applications to request new access tokens seamlessly in the background.
This lesson explores how refresh tokens are issued, how clients securely authenticate during the exchange, and how modern security policies like rotation and reuse detection protect long-lived sessions.
The purpose of the refresh token
Refresh tokens act as long-lived credentials that clients use to obtain new access tokens without requiring the user to re-authenticate. The authorization server typically issues a refresh token alongside the initial access token during the authorization code flow. This usually occurs when server policy permits it by default or when the client explicitly requests specific scopes, such as offline_access.
A common misconception from older architectures is that the state parameter plays a role in the refresh token process. This is incorrect. The state parameter strictly belongs to the front-channel authorization redirect ...