As mentioned in a previous patch [0], here is a patch against
http://hg.nginx.org/nginx-tests supplying the tests that check that
proxy_cache_lock can be used when proxy_cache_use_stale is set to off.

There are two cases:
Firstly when the upstream sets a 'Cache-Control' header, the response is
cached for the specified duration.
Secondly when proxy_cache_valid is used to define the cache duration.


[0]
http://mailman.nginx.org/pipermail/nginx-devel/2018-December/011658.html



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