Re: [fetch] Update Access-Control-Allow-Headers CORS response header to allow * (allow-all) (#251)

@craigfrancis, One thing I suspect is that users like to be able to specify

`Access-Control-Allow-Origin: *`

since it means that they don't need to worry about supplying the **Vary: Origin** header (for correct browser/proxy caching). So maybe in their code, they include a check for Origin, and if it's on their 'safe' list, they respond with:

`Access-Control-Allow-Origin: *`

rather than

`Access-Control-Allow-Origin: http://www.goodguy.com`

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