How to download a file from server without browser opening new window?

Hi,

I created a servlet that provides a downloadable file (from String content) by writing to the ServletOutputStream.
On the client side, I trigger the file download by an Anchor with:

Window.open(GWT.getModuleBaseURL() + "MyServlet", "_blank", "");

It works fine, BUT it seems to open a new browser window, which is somehow directly closed. After this the file download dialog is show.
How can I prevent this flickering of a new browser window? Can't I achieve this somehow inline?

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