RFC 8594 defines the Sunset HTTP response header field, an HTTP-date indicating when a URI is expected to become unresponsive, and the sunset link relation type for pointing at a sunset policy or migration information. Published May 2019 as an Informational RFC.
Sunset HTTP Header Field (RFC 8594)
RFC 8594, by Erik Wilde, defines two things: a Sunset response header carrying a single HTTP-date after which the resource is expected to stop responding (a hint, not a guarantee), and a sunset link relation pointing at the provider’s sunset policy, upcoming sunsets or migration options. It is Informational, not Standards Track. RFC 9745 pairs it with a Deprecation header and requires the sunset date not to be earlier than the deprecation date.
Business layer
The API Commons deprecation-policy schema records whether a provider emits the Sunset header alongside its minimum notice and support windows. See The Technical Side Translated. The Business Side Did Not.
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