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

An alternative proposed by @wanderview is some kind of `fetcherror` event:

```js
self.addEventListener('fetcherror', event => {
  event.fallbackToDefaultRequest();
});
```

The benefits of this is the isolation of your error handling code from the thing that might be causing the error. However, you can only fallback to default behaviour, not provide some other kind of response. But do we need a whole new event? What if the request's body has already been used? Is that a problem?

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