POST to server, receive PDF, deliver to user w/ jQuery

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Take a look at – jQuery Plugin for Requesting Ajax-like File Downloads

The whole plugin is just about 30 lines of code (including comments).

The call is fairly similar to jquery ajax call.

$.download('/export.php','filename=myPDF&format=pdf&content=" + pdfData );

Ofcourse, you have to set the content-type and Content-Disposition headers on the server side as you would for any such download.

In java I would do something like this

response.setContentType("application/pdf");
response.setHeader("Content-Disposition", "attachment; filename="exported.pdf");

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