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File: //usr/local/CyberPanel/lib/python3.10/site-packages/django/utils/__pycache__/cache.cpython-310.pyc
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This module contains helper functions for controlling caching. It does so by
managing the "Vary" header of responses. It includes functions to patch the
header of response objects directly and decorators that change functions to do
that header-patching themselves.

For information on the Vary header, see RFC 9110 Section 12.5.5.

Essentially, the "Vary" HTTP header defines which headers a cache should take
into account when building its cache key. Requests with the same path but
different header content for headers named in "Vary" need to get different
cache keys to prevent delivery of wrong content.

An example: i18n middleware would need to distinguish caches by the
"Accept-language" header.
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    Patch the Cache-Control header by adding all keyword arguments to it.
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    Add HTTP caching headers to the given HttpResponse: Expires and
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    Add (or update) the "Vary" header in the given HttpResponse object.
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    Return a cache key based on the request URL and query. It can be used
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    Learn what headers to take into account for some request URL from the
    response object. Store those headers in a global URL registry so that
    later access to that URL will know what headers to take into account
    without building the response object itself. The headers are named in the
    Vary header of the response, but we want to prevent response generation.

    The list of headers to use for cache key generation is stored in the same
    cache as the pages themselves. If the cache ages some data out of the
    cache, this just means that we have to build the response once to get at
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