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The proxy caches images in different ways, depending on the rate of requests, no more than 31 days, most often at least 7 days.
The rules we use for server side caching are different from the ones you see in the headers we provide for browsers.
We utilize proxy-caching in NGINX to accomplish this, on top of that, CloudFlare caches the most frequently accessed images globally.
The server will only initiate a refresh when all caches have expired, and only when the image is still being requested by end users.