advanced~2h
JWT: Token-Based Authentication
Session cookies don't scale cleanly across load-balanced servers or mobile clients. This chapter is JWT — a self-contained, signed token that carries identity without server-side session state.
Learning objectives
- Beginner: Explain the difference between an opaque token and a self-contained (JWT) token.
- Intermediate: Generate and validate a JWT in a custom Spring Security filter.
- Advanced: Implement refresh token handling and expiration correctly, including what to do when a refresh token is reused after rotation.
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JWT: Token-Based Authentication