Are Cache Purge and Prefetch Mandatory?

This depends on the scenario.

After updating a file on the origin server, purge the cache on CDN PoPs. Or, clients may obtain the stale version of the file, or encounter issues such as access failures, repeated redirections, white screens, or disordered page displays.
It is recommended that large files, especially video files, be prefetched to improve user experience.
Prefetch is not recommended for small files.

Parent topic: Cache Purge and Prefetch

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