By default fine-uploader marks an upload as a success when it recieves the following json file.
{ "success": "true" }
Does fine-uploader support passing extra data back to the client and doing something with it?
All data passed from your server can be accessed on the 3rd parameter passed to your onComplete
event handler, which is a JavaScript object. Note that the `XMLHttpRequest instance used to send the request is also available as the 4th param.