IE9 prompts user on submission of hidden iFrame

Question

I am debugging our file uploading script, which uses a hidden iframe in browsers that do not support sending file data via an XMLHttpRequest object.

There is a ple

Answer 1

photo_upload.json IS being downloaded into the iframe, but because the browser doesn't know what to do with it, it assumes it to be a file for download.

Ideally, you should have the iframe receive HTML data, which may contain a