Re: [w3c/ServiceWorker] mode 'no-cors' showing error no 'access-control-allow-origin' header (#1064)

You cannot make no-cors requests with `cache.add` as it cannot tell you if the response was 404 or not. You can work around this by fetching the response with `fetch` then use `cache.put`, which allows you to store things like 404s.

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