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Decorator for views that tries getting the page from the cache and
populates the cache if the page isn't in the cache yet.
The cache is keyed by the URL and some data from the headers.
Additionally there is the key prefix that is used to distinguish different
cache areas in a multi-site setup. You could use the
sites.get_current_site().domain, for example, as that is unique across a Django
project.
Additionally, all headers from the response's Vary header will be taken
into account on caching -- just like the middleware does.
i i s> cache_page has a single mandatory positional argument: timeoutt cachet
key_prefixsC cache_page has two optional keyword arguments: cache and key_prefixt
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Decorator that adds headers to a response so that it will
never be cached.
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