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Phase 9 · API Design

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API Versioning

Part of the Backend Developer Roadmap.

Summary

Strategies for evolving an API without breaking existing clients — URL versioning (`/v1/`), header versioning, or additive-only changes.

How to Learn This

  • 1Compare URL-based versioning vs header-based versioning trade-offs.
  • 2Design how you'd introduce a breaking change to an endpoint without breaking existing clients.
  • 3Learn why 'never remove a field, only add' is a common additive-versioning strategy.

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