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API Versioning Errors — Breaking Changes and Compatibility Issues

Warning4xx client error

Overview

Resolve REST API versioning errors including deprecated endpoint failures, incompatible response formats, and version negotiation problems.

Key Details

  • API versioning prevents breaking changes from affecting existing clients
  • Common strategies include URL path (/v1/), query parameter (?version=1), and header-based versioning
  • Deprecated API versions may return 410 Gone or Sunset headers before removal
  • Breaking changes include removing fields, changing types, renaming endpoints, or altering authentication
  • Version mismatch between client SDK and API version is a frequent source of errors

Common Causes

  • Client sending requests to a deprecated or removed API version
  • Response format changes breaking client-side parsing logic
  • Missing or incorrect API version header in requests
  • SDK version not matching the target API version

Steps

  1. 1Check the API documentation for the current supported versions and deprecation schedule
  2. 2Look for Sunset and Deprecation headers in API responses indicating upcoming removal dates
  3. 3Update your API client SDK to the latest version compatible with the target API version
  4. 4If using header-based versioning, ensure the Accept or API-Version header is set correctly
  5. 5Test against the new API version in a staging environment before switching production traffic

Tags

api-versioningrestbreaking-changesdeprecationcompatibility

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Frequently Asked Questions

The Sunset HTTP header indicates the date after which an API version will be removed. Clients should migrate to a newer version before this date to avoid service disruption.