Re: [slightlyoff/ServiceWorker] Recovering from fetch failures (#939)

`fetchEvent.isResponseAcceptable(response)` or similar would help here.

```js
event.respondWith(
  something.then(response => {
    if (!event.isResponseAcceptable(response)) throw Error("Boom");
    return response;
  }).catch(() => {
    return fetch(event.request).catch(() => genericErrorPage);
  })
)
```

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