Re: [fetch] fetch() needs to send a */* header (#142)

As an example, people write code like this which expect Accept to always be present:

```
   var doesRequestAcceptHtml = function (request) {
        return request.headers.get('Accept')
            .split(',')
            .some(function (type) { return type === 'text/html'; });
    };
```

From:

  https://www.theguardian.com/service-worker.js

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