java – 在GWT中使用RequestBuilder处理附件

回应流的标题是：

Content-Disposition: attachment; filename=report.pdf

我想在用户浏览器的新窗口中打开此PDF,或者提示他下载它.

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        
}

应该如何处理onResponseRecieved的响应？