AJAXDownload Example Doesn't Support Content-Disposition (Save As)

[eugenebalt]

I followed the AJAXDownload example on how to do an Ajax-based file download:

https://cwiki.apache.org/WICKET/ajax-update-and-file-download-in-one-blow.html

It works, but my problem is, I can't get it to support the
Content-Disposition header "attachment" to do the Save As dialog box. The
file opens *immediately* inside the browser even when I override
setHeader(..) for the ByteArrayResource.  This works with the regular
ResourceLink, but not this AJAXDownload.

Can anyone help how to do this AJAX-based download, but with the Save As
Content-Disposition=attachment, so it gives me a prompt before I download?

CODE:

final AJAXDownload download = new AJAXDownload()
{

        @Override
        protected IResourceStream getResourceStream() {
                // TODO Auto-generated method stub
                ByteArrayResource bar = new 
ByteArrayResource("application/vnd.ms-excel",
createExcelBytes());
                {
                        @Override
                        protected void setHeaders(WebResponse response)         
                 
                        {
                                response.setHeader("Content-Disposition", 
"attachment;
filename=report.xls");
                        }                                       
                };
                return bar.getResourceStream();
        }

};
add(download);

AjaxLink exportLink = new AjaxLink("exportLink") {

        @Override
        public void onClick(AjaxRequestTarget target) {

                download.initiate(target);
        }

};      


AJAXDownload (from example):
-----------------------------
public abstract class AJAXDownload extends AbstractAjaxBehavior
{
        /**
         * Call this method to initiate the download.
         */
        public void initiate(AjaxRequestTarget target)
        {
                CharSequence url = getCallbackUrl();

                target.appendJavascript("window.location.href='" + url + "'");
        }

        public void onRequest()
        {
                getComponent().getRequestCycle().setRequestTarget(
                                new 
ResourceStreamRequestTarget(getResourceStream(), getFileName()));
        }

        /**
         * @see ResourceStreamRequestTarget#getFileName()
         */
        protected String getFileName()
        {
                return null;
        }

        /**
         * Hook method providing the actual resource stream.
         */
        protected abstract IResourceStream getResourceStream();
}



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