Internet Engineering Task Force (IETF)P. McManus
Request for Comments: 8246Mozilla
Category: Standards TrackSeptember 2017
ISSN: 2070-1721

HTTP Immutable Responses


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.