Re: [slightlyoff/ServiceWorker] Eliminating SW startup latency for common case (#920)

@ykahlon 

> We actually need a simpler solution

But just to clarify, the idea above works for you too?

> we would like the SW to make the preflight request and only if the SW decides to make the exact same request, it will be handed to the SW (the SW doesn't need to know whether it was a preflight request).

So does that mean your implementation would look something like:

```js
self.addEventListener('fetch', event => {
  event.respondWith(
    event.preloadResponse || fetch(event.request)
  );
});
```

…where `preloadResponse` is a promise for a response fetched using `event.request` plus optional headers.

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