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I am making a HTTP POST request from GWT Client to a HTTPServlet. This Servlet is creating a PDF file from request content and writing it to response stream. Headers of the response stream are: Content-Disposition: attachment; filename=report.pdf I want to open this PDF in new window of the user's browser or prompt him to download it. import com.google.gwt.http.client.*; ... String url = "http://www.myserver.com/getData?type=3"; RequestBuilder builder = new RequestBuilder(RequestBuilder.POST, URL.encode(url)); try { Request request = builder.sendRequest(data, new RequestCallback() { public void onError(Request request, Throwable exception) { // Couldn't connect to server (could be timeout, SOP violation, etc.) } public void onResponseReceived(Request request, Response response) { if (200 == response.getStatusCode()) { // Process the response in response.getText() // Window.open(url, "_blank", ""); } else { // Handle the error. Can get the status text from response.getStatusText() } } }); } catch (RequestException e) { // Couldn't connect to server } How should I handle response in onResponseRecieved?

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