multipart response possible with Rack?

[Michael Franzl <michaelfranzl@gmx.at>]

I would like to generate a multipart HTTP response to a conventional 
GET request. For the end user, this will display a web page and 
download a file simultaneously. The response should look like the 
example below.

Can I do this with Rack?

Thanks,
Michael

     HTTP/1.1 200/OK
     Content-type: multipart/mixed; boundary=xyz
     Content-Description: multipart-1

     --xyz
     Content-Type: text/plain
     Content-Disposition: inline
     Content-Description: text-part-1

     Some text goes here.

     --xyz
     Content-Type: application/vnd.print
     Content-Disposition: inline; filename=invoice.bon
     Content-Description: invoice-part-2

     This is text inside of a file.
     --xyz--


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