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subject
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... representation
An entity included with a response that is subject to content
negotiation, as described in section 12. There may exist multiple
representations associated with a particular response status.
...
... associated with it at any given instant. Each of these
representations is termed a `variant.' Use of the term `variant'
does not necessarily imply that the resource is subject to content
negotiation.
...
...
Any response containing an entity-body MAY be subject to negotiation,
including error responses ...
... 410 may be stored by a cache and used in reply to a subsequent
request, subject to the expiration mechanism, unless a Cache-Control
directive prohibits caching. However, a cache ...
... proxy MUST NOT change those headers that are
listed in section 13.5.2 as being subject to the no-transform
directive. This implies that the cache or proxy ...
... HTTP/1.1 server MUST include an appropriate Vary header field with
any cachable response that is subject to server-driven negotiation.
Doing so allows a cache ...
... negotiation
on that resource. A server SHOULD include an appropriate Vary header
field with a non-cachable response that is subject to server-driven
negotiation, since this might provide the user agent ...
...
A server is in the position to save personal data about a user's
requests which may identify their reading patterns or subjects of
interest. This information is clearly confidential in nature and its
handling may be constrained by law in certain countries. People using
...