forceIframeTransport and context.Request in HttpHandler

Question

I have used blueimps jquery file upload plugin to upload files in WebForms application. The plugin sends files to the http handler which parses context.Request.InputStream and uses context.Request.Form["param"] that was set with formData part of the request.

Everything works fine in modern browsers, but as soon as forceIframeTransport option is needed (IE 7 for example) all those Request properties are empty.

How can I get the file stream and form data in that case?

Answer 1

The answer was to include the jquery.iframe-transport.js file. Without that file the inputs were not created (and therefore not submitted).

Also I had to change the way formData is treated (as simple formData.someProperty was not there - you have to use formData[0].name / value) and the response was returned as a html page (instead of plain json).