2.2.1. Invalidation

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Original RFC Text

2.2.1.  Invalidation

   A cache that invalidates a stored response MAY invalidate any stored
   responses that share groups (per Section 2.1) with that response.
   Note that further grouped invalidations are not triggered by a
   grouped invalidation; i.e., this mechanism does not cascade.

   Cache extensions can explicitly strengthen the requirement above.
   For example, a targeted cache control header field [TARGETED] might
   specify that caches processing it are required to invalidate such
   responses.