title: Using Javascript to send an HTTP attachment to the user (open browser's Save as... dialog)
body: <p>I'm new to web development, so I apologize if this question is noobish. I want to serve a file that is on the server's hard drive to the user when requested (ie, send an HTTP attachment to trigger the browser's "Save as..." dialog) in Javascript. The user clicks on a button on the page, the server generates a customized data file based on some of his/her account settings (and other parameters), and then the "Save as..." dialog should pop up. How should I go about implementing this in Javascript?</p>
  
  <p><strong>edit:</strong> for your reference, the server has Glassfish and Apache</p>