[Feature Request] Upload component, Response Headers missing in "on-success" attribute function

### Existing Component
Yes

### Component Name
Upload

### Description
The `on-success` hook function when uploaded the upload is successful returns:

`function(response, file, fileList)`

But the `response` only contains the payload, it does not contain any headers. Having access to the header could be used to update the authentication token that gets passed via the response headers that are updated on every api call.

Is there any known way to get the headers in the hooked `on-success` function?