Hi, I've followed a bunch of tutorials and I'm able to click a button, send parameters via a Window.open() call to an HttpServlet and it will construct a bunch of files, zip them up and send them back. The problem is sometimes creating these files can take some time, and a blank window just stares at me while it's doing so. I was wondering if there's a nicer way, like an RPC so I can tell when it's returned or an error has occurred but still have a File Dialog pop up for the user to save the .zip as normal?
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