Re: [fetch] Aborting a fetch (#27)

This is cancellable promises thing is really hard to stomach. So let's say I make a request like this:
```js
let resultPromise = fetch(url).then(parseResponse).then(retrieveResult);
```
I'm assuming I'd only need to call `cancel()` on `resultPromise` to actually cancel the request? But if I did this instead:
```js
let responsePromise = fetch(url).then(parseResponse);
let resultPromise = responsePromise.then(retrieveResult);
```
I'm now assuming I would need to call `cancel()` on _both_ `responsePromise` and `resultPromise`? That's insanity, obviously, so I'm assuming you're suggesting that once `responsePromise` is garbage collected, it will intrinsically signal disinterest. Besides being non-deterministic, that might have made sense until you think about wanting to make a request where you don't care about the result, but still **don't want it to cancelled**:
```js
fetch('/log/user_action');
```
What am I missing here?

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https://github.com/whatwg/fetch/issues/27#issuecomment-176479330