rfc9875v2.txt		rfc9875.txt
	skipping to change at line 12 ¶		skipping to change at line 12 ¶
	Internet Engineering Task Force (IETF) M. Nottingham		Internet Engineering Task Force (IETF) M. Nottingham
	Request for Comments: 9875 Cloudflare		Request for Comments: 9875 Cloudflare
	Category: Standards Track October 2025		Category: Standards Track October 2025
	ISSN: 2070-1721		ISSN: 2070-1721
	HTTP Cache Groups		HTTP Cache Groups
	Abstract		Abstract
	This specification introduces a means of describing the relationships		This specification introduces a means of describing the relationships
	between stored responses in HTTP caches, "grouping" them by		between stored responses in HTTP caches, grouping them by associating
	associating a stored response with one or more strings.		a stored response with one or more strings.
	Status of This Memo		Status of This Memo
	This is an Internet Standards Track document.		This is an Internet Standards Track document.
	This document is a product of the Internet Engineering Task Force		This document is a product of the Internet Engineering Task Force
	(IETF). It represents the consensus of the IETF community. It has		(IETF). It represents the consensus of the IETF community. It has
	received public review and has been approved for publication by the		received public review and has been approved for publication by the
	Internet Engineering Steering Group (IESG). Further information on		Internet Engineering Steering Group (IESG). Further information on
	Internet Standards is available in Section 2 of RFC 7841.		Internet Standards is available in Section 2 of RFC 7841.
	skipping to change at line 152 ¶		skipping to change at line 152 ¶
	2. They both share the same URI origin (per Section 4.3.1 of		2. They both share the same URI origin (per Section 4.3.1 of
	[HTTP]).		[HTTP]).
	2.2. Cache Behaviour		2.2. Cache Behaviour
	2.2.1. Invalidation		2.2.1. Invalidation
	A cache that invalidates a stored response MAY invalidate any stored		A cache that invalidates a stored response MAY invalidate any stored
	responses that share groups (per Section 2.1) with that response.		responses that share groups (per Section 2.1) with that response.
	Note that further grouped invalidations are not triggered by a		Note that further grouped invalidations are not triggered by a
	grouped invalidation; i.e., this mechanism does not "cascade".		grouped invalidation; i.e., this mechanism does not cascade.
	Cache extensions can explicitly strengthen the requirement above.		Cache extensions can explicitly strengthen the requirement above.
	For example, a targeted cache control header field [TARGETED] might		For example, a targeted cache control header field [TARGETED] might
	specify that caches processing it are required to invalidate such		specify that caches processing it are required to invalidate such
	responses.		responses.
	3. The Cache-Group-Invalidation Response Header Field		3. The Cache-Group-Invalidation Response Header Field
	The Cache-Group-Invalidation response header field is a List of		The Cache-Group-Invalidation response header field is a List of
	Strings (Sections 3.1 and 3.3.3 of [STRUCTURED-FIELDS]). Each member		Strings (Sections 3.1 and 3.3.3 of [STRUCTURED-FIELDS]). Each member
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