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A comment on Gmail, Google Maps and YouTube had outage issues. Parent comment

Re:Gmail, Google Maps and YouTube had outage issues by hobofan on Tuesday September 12, 2017 @12:23PM (#15228612)
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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