field Registered
Verified 2026-09-18 · registry updated
2026-08-28Sunset
Communicates the date when a resource or endpoint will be removed.
Sunset answers when a resource disappears; the Deprecation field signals that a feature is deprecated. Send both when deprecating an API with a planned removal date.
httpheaderapilifecycle
Reference (http)
Sunset: Wed, 31 Dec 2026 23:59:59 GMT
Sunset answers when a resource disappears; the Deprecation field signals that a feature is deprecated. Send both when deprecating an API with a planned removal date.
Common mistakes
- Sending Sunset without documentation of the replacement, or confusing it with the deprecation signal.
IANA registry: http-fields/field-names
Registry reference: RFC 8594: The Sunset HTTP Header Field
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