$upstream_cache_status output definitions

[Friscia, Michael]

I read this in the documentation

$upstream_cache_status
keeps the status of accessing a response cache (0.8.3). The status can be either “MISS”, “BYPASS”, “EXPIRED”, “STALE”, “UPDATING”, “REVALIDATED”, or “HIT”.

But I’m sort of at a loss as to what the meanings are, specifically what is Hit and Miss? The only two I really understand are Stale and Bypass. Does Hit mean it hit the upstream server or that it hit the cached copy? I’m basically trying to map these to determine whether a cache copy was served or if a fresh copy was pulled from the upstream server because I am getting some mixed results compared to my settings and realized I might be using incorrect definitions for each status.

Thanks,
-mike



___________________________________________
Michael Friscia
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Yale School of Medicine
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