HTTP registry: collapsed
Indicates whether this request was collapsed together with one or more other forward requests (see, Section 4); If true, the response was successfully reused; if not, a new request had to be made.
Caching values control freshness, reuse, validation, and visibility across browser, proxy, and CDN layers. collapsed is registered in HTTP Cache-Status. Defining reference: rfc9211.
Identifier (http)
collapsed
Indicates whether this request was collapsed together with one or more other forward requests (see, Section 4); If true, the response was successfully reused; if not, a new request had to be made.
Keep cache keys aligned with response variation, separate private from shared data, and test stale and revalidation behavior across intermediaries.
This registry value is currently marked active by IANA. Follow the defining specification before sending, accepting, or proxying it.
IANA registry: http-cache-status/http-cache-status-names
Registry reference: rfc9211
Sources