governing-api-versioning

API versioning and lifecycle management prevents consumer disruption by enforcing URI-based versioning with /v1/ prefixes and using Expand and Contract migration for safe transitions. This maintains backward compatibility while evolving endpoints.

The Expand and Contract pattern guides safe API version transitions by first expanding the API to support both old and new structures, then contracting to remove the old version after consumers migrate, preventing breaking changes.

Implement RFC 8594 Deprecation and Sunset headers to signal API lifecycle changes by attaching these headers to responses, communicating deprecation timelines and sunset dates to consumers programmatically.

URI-based versioning with a /v1/ prefix is ideal for public APIs requiring explicit major version visibility in the endpoint path, simplifying routing and consumer integration compared to header-based versioning.

Classify API breaking changes by auditing modifications against versioning governance rules, distinguishing between breaking changes requiring major version increments and backward-compatible changes suitable for minor updates.

Relying solely on Sunset headers limits deprecation communication to clients actively checking headers, missing consumers who do not process these signals, necessitating comprehensive documentation and direct migration path guidance.