Force Browser to download Image with Javascript window.open?

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Use application/octet-stream instead of image/jpg:

If [the Content-Disposition] header is used in a response with the application/octet-stream content-type, the implied suggestion is that the user agent should not display the response, but directly enter a `save response as…’ dialog.
— RFC 2616 – 19.5.1 Content-Disposition

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