Prefetch URLs and caching not working

[Laudian]

To my knowledge, files are still only prefetched after a first request, not automatically after a cache purge.

What is the interval in which "prefetching" works?

It looks like prefetch happens upon request to a webpage with the appropriate prefetch in the header. Keep in mind this is an Enterprise Plan feature. https://support.cloudflare.com/hc/en-us/articles/206776707-Does-Cloudflare-Do-Prefetching-

Also, none of the files in your prefetch manifest seem to be cacheable by default, and thus are not eligible for prefetch.

@Docs

• Cloudflare will only prefetch files listed in the manifest file if the resources are those cached by default.