Re: [whatwg/fetch] fetch() doesn't properly handle errors from pre-flight responses with CORS (#443)

> Yes. That's how CORS has worked for a decade.

But with XHR, I can can get response successful, even I `OPTION` a 404 API.

![image](https://user-images.githubusercontent.com/15863224/44066555-8d23f176-9fa3-11e8-907b-f6c8bbbb7d05.png)

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