[nginx] list proxy_cache keys

[Robert Paprocki]

Hello!

Is a quick way to easily list all the keys stored in a proxy_cache
memory zone? I would like to be able to list all cache elements without
implementing a custom tracking solution. I looked through the source of
both the proxy_cache facet, and FRiCKLE's purge module, but my C isn't
strong enough to be able to thoroughly understand what's going on under
the hood. Any ideas/solutions?