Re: [ServiceWorker] CacheStorage.has() should not reject to indicate there is no such cache with cacheName (#781)

This is already how the spec is written.  My quick test suggests both chrome and Firefox resolve false in this case.

Are you trying this in an http:// window?  Cache API requires HTTPS.

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https://github.com/slightlyoff/ServiceWorker/issues/781#issuecomment-156579979