Re: [w3c/ServiceWorker] Should EventSource and WebSocket be exposed in service workers? (#947)

We use service worker to indicate incoming call. It starts with push notification. Then ServiceWorker opens WebSocket where it receives message if the ringing is active. If yes then it shows a Notification and waits until it receives "`ring_end`" message. Afterwards it closes the Notification and the connection. Without WebSocket we would need to use HTTP (long)polling.

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