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API versioning, deprecation headers, and keeping CORS policies in sync
When you sunset paths or versions, browsers and proxies must still receive consistent CORS headers on error responses.
1 min read
versioningapi-designcors
Cross-origin communication
Clients need readable Deprecation signals—ensure Expose-Headers lists those names for cross-origin dashboards.
410 Gone should still include CORS headers if the client uses fetch to read the status.
Migration planning
Coordinate frontend releases with backend version cuts so you do not strand users with silent network failures.
Publish a calendar with preflight-compatible endpoints for each environment.