CORS - ensure upload is failed if a valid response is not received after iframe onload
CORS - ensure upload is failed if a valid response is not received after iframe onload

SimonWaldherr/uploader,FineUploader/fine-uploader,FineUploader/fine-uploader,SimonWaldherr/uploader,SimonWaldherr/uploader,SimonWaldherr/uploader,FineUploader/fine-uploader,SimonWaldherr/uploader,SimonWaldherr/uploader,SimonWaldherr/uploader