- Implement API version management middleware
- Add version lifecycle management (dev/stable/maintenance/deprecated/sunset)
- Add deprecation warning headers (X-API-Deprecated, X-API-Sunset-Date)
- Add version tracking headers (X-API-Version)
- Handle sunset versions with 410 Gone response
- Comprehensive API versioning documentation
- Include migration guide and best practices
- Support gradual version rollout
Phase 4 Task 44/68 completed
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