Hello!

I'm experimenting with fastcgi caching - I've added $upstream_cache_status
to the access log, and I can see that periodically there will be a small
cluster of EXPIRED requests for an object.

Does EXPIRED imply that the object was fetched from origin each time?
...or that the requests were queued while a request to origin was made?
...or that the expired object was served while an update was fetched?
...or something else?

I can understand any of those cases, I just want to be able to explain how
many origin fetches were actually done.
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