title: Offer a generated file for download from jQuery post
body: <p>I've got a large form where the user is allowed to input many different fields, and when they're done I need to send the contents of the form to the server, process it, and then spit out a .txt file containing the results of the processing for them to download. Now, I'm all set except for the download part. Setting the headers on the response to the jQuery .post() doesn't seem to work. Is there any other way than doing some sort of iframe trick to make this work (a la <a href="https://stackoverflow.com/questions/3499597/javascript-jquery-to-download-file-via-post-with-json-data">JavaScript/jQuery to download file via POST with JSON data</a>)?</p>
  
  <p>Again, I'm sending data to the server, processing it, and then would like to just echo out the result with headers to prompt a download dialog. I don't want to write the result to disk, offer that for download, and then delete the file from the server.</p>