RFC 8246
HTTP Immutable Responses, September 2017
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DOI: https://doi.org/10.17487/RFC8246
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Abstract
The immutable HTTP response Cache-Control extension allows servers to identify resources that will not be updated during their freshness lifetime. This ensures that a client never needs to revalidate a cached fresh resource to be certain it has not been modified.
For the definition of Status, see RFC 2026.
For the definition of Stream, see RFC 8729.