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by omni 3198 days ago
Why doesn't having the resources cached provide a buffer against short-term outages of the CDN?
2 comments
hobofan 3198 days ago
Because normal Cache-Control is only aimed at reducing the amount of data transferred. With newer immutable Cache-Control[0], a CDN going down wouldn't have an effect if you have the resources cached.

[0]: https://hacks.mozilla.org/2017/01/using-immutable-caching-to...

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nleach 3198 days ago
The browser still has to make a request to the CDN to get back an HTTP 304. The goal is to avoid downloading a potentially large payload, not be resilient against connectivity issues.
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