Can service workers cache POST requests?

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You can’t cache POST requests using the Cache API. See https://w3c.github.io/ServiceWorker/#cache-put (point 4).

There’s a related discussion in the spec repository: https://github.com/slightlyoff/ServiceWorker/issues/693

An interesting solution is the one presented in the ServiceWorker Cookbook: https://serviceworke.rs/request-deferrer.html
Basically, the solution serializes requests to IndexedDB.

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