Caching/Headers question

[Jo Galara]

By the way: Is there a way to "preload" files which ran out of TTL?

Let's say I download file example.bin which is cached for 24h (Apache
backend sends Expires header) and download it the next time 48h later.
Varnish would have to redownload the file once a Client (Browser)
requests that file again, right? Is there a way so Varnish automatically
downloads files from the Apache backend as soon as their files Expire?

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