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OAuth 2.0 for Enterprise Authentication in 2025
## 6 Common gotchas (and fast fixes) |Oops|Why it happens|Fix| |--|--|--| |**Invalid `redirect_uri`**|Typos, or http vs https.|Copy exact string from dashboard.| |**Missing PKCE**|Old sample code.|Add PKCE always—BCP makes it mandatory.| |**Token too big for cookie**|You stuffed JWT in cookie.|Keep it in memory or split.| |**Refresh token revoked**|User changed password.|Gracefully force re-auth.|
Related Pain Points4件
Complex redirect URI configuration and validation
8Developers must configure redirect URIs precisely and validate them correctly. Misconfigurations or pattern-matching flaws can be exploited for open redirector attacks and credential theft.
OAuth security best practices enforcement and backward compatibility
7As security threats evolve, new best practices emerge (PKCE, expiring tokens, refresh token restrictions) but enforcement is inconsistent. OAuth 1.0a is still in use alongside 2.0, and upgrading security requirements breaks backward compatibility, forcing developers to support multiple outdated security models simultaneously.
JWT tokens too large to store in cookies
5Developers often attempt to store self-encoded OAuth 2.0 tokens (JWTs) in cookies, but token size can exceed browser cookie limits. Alternative storage methods (memory, splitting) add implementation complexity.
Refresh token revocation on user password change
4When users change passwords, refresh tokens may be revoked by OAuth providers, forcing applications to handle re-authentication. Graceful re-auth flows must be implemented to prevent user frustration.