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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