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I have my ExportServlet, which are generating XLSX files (Excel) which my user will request from my GWT application by clicking a export button. If I use the GET approach, the user are prompted to download the file. The code looks like this: @Override protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException { try { byte[] xlsx = createTest(""); sendXLSX(resp, xlsx, "test.xlsx"); } catch (Exception e) { e.printStackTrace(); } } void sendXLSX(HttpServletResponse response, byte[] bytes, String name) throws IOException { ServletOutputStream stream = null; stream = response.getOutputStream(); response.setContentType(CONTENT_TYPE_XLSX); response.addHeader("Content-Type", CONTENT_TYPE_XLSX); response.addHeader("Content-Disposition", "inline; filename=" + name); response.setContentLength((int) bytes.length); stream.write(bytes); stream.close(); } This is invoked by the GWT client in the following manner: String url = GWT.getModuleBaseURL() + "ExportServlet"; Window.open(url, "", ""); and the user is prompted to download the file. Good, thats what I want :) But I would like to attach a lot of data in the request, and afaik, there is a limit to how much data you can put in a URL parameter ("ExportServlet?data=..."), so I would like to wrap that in a POST request instead. I have tried the following from GWT: String url = GWT.getModuleBaseURL() + "ExportServlet"; RequestBuilder builder = new RequestBuilder( RequestBuilder.POST, url); Request response = builder.sendRequest("test data", new RequestCallback() { @Override public void onResponseReceived(Request request, Response response) { System.out.println(""); } @Override public void onError(Request request, Thr

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