Problem using RPCRequest to hit servlet that returns application/pdf

[Sytematic]

Hello,

Using: (v8.2p_2012-07-30/PowerEdition Deployment 2012-07-30)

I have a POST servlet that generates some special PDF file.
Rather than storing it on the server, and returning a download link, I would like to let the browser download it immediately (ie. return a http response of content-type application/pdf).

I use the Content-type: application/pdf return header, and verified using firebug that the PDF is in the response.

Yet it doesn't trigger the download.
I trigger the servlet from the client as follows:

private void generatePdfOnServer(List<String> pages){
	RPCRequest request = new RPCRequest();
	request.setActionURL(GWT.getModuleBaseURL() + "sc/GeneratePdf");
	request.setHttpMethod("POST");
	request.setShowPrompt(false);
	request.setWillHandleError(true);
			
	Map<String, Object> params = new HashMap<String, Object>();
	params.put("template","kitchenlist_template.html");
	params.put("pages", pages);
	params.put("placeholder", "__CONTENT__");
	request.setData(params);
	RPCManager.sendRequest(request);
}

In the servlet, I use the normal httpresponse to return it (ie. not using rpc.send(rpcReq, rpcResp), should i?)

Server code that outputs the data to the client

....
//response is of type HttpServletResponse passed in in doPost(...)	      
 response.setContentType("application/pdf");			

OutputStream os = response.getOutputStream();

ITextRenderer renderer = new ITextRenderer();
renderer.setDocumentFromString(html);
renderer.layout();
renderer.createPDF(os); //writes to the output stream
renderer.finishPDF();

If i specify an RPCCallback, I can also see in the rawData variable that a PDF is returned.

Should I trigger this thing differently from the client for my purpose?

Any advice is welcome!

[Sytematic]

Aha, just after posting this, I realized what might be wrong.

My client code is now like this:

RPCRequest request = new RPCRequest();
			request.setActionURL(GWT.getModuleBaseURL() + "sc/GeneratePdf");
request.setHttpMethod("POST");
request.setShowPrompt(false);
request.setWillHandleError(true);
request.setDownloadResult(true);
request.setContentType("application/pdf");
			
Map<String, Object> params = new HashMap<String, Object>();
			params.put("template","kitchenlist_template.html");
params.put("pages", pages);
params.put("placeholder", "__CONTENT__");
request.setData(params);
RPCManager.sendRequest(request);

and this works for me!