field Registered
Verified 2026-09-18 · registry updated
2026-08-28Deprecation
Signals that a resource or API feature is deprecated.
Use Deprecation with documentation, migration guidance, and a planned removal policy. It is a signal, not automatic enforcement.
httpheaderapilifecycle
Reference (http)
Deprecation: @1735689600
Use Deprecation with documentation, migration guidance, and a planned removal policy. It is a signal, not automatic enforcement.
Common mistakes
- Sending a deprecation date without telling clients what to use instead.
IANA registry: http-fields/field-names · structured type: Item
Registry reference: RFC 9745, Section 2: The Deprecation HTTP Response Header Field
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