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I need to export a list of images to generate a PDF file so the user can download.

What I used to do is using the plain form submit with hidden iframe, and the endpoint generates a response that contains Content-Disposition.

But, I need to some additional information in the response header (in this case, the list of images files that are corrupted). 

I switched to use Jquery form plugin. While it does give me the response body, but it won't trigger the Save as download window anymore.

Are there any other alternatives to it ? 

The root issue is that I want to include some additional info along with a file download.