There is no known record of MIME type application/download, neither in the definition of IANA nor on any other references like W3C publications.
Such MIME types may appear in a data stream only if it gets corrupt and is misread. There were bugs specifically in Mozilla Firefox browser where non-existent mime types like application/download would get uploaded by the browser. This is one of the known issues with the browser for which a solution is yet to be announced.
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