how not to cache background image?

Hello,

I set the background image of a web app in the root panel like this:

getElement().getStyle.setBackgroundImage(url);

When I change the background image, I only change a symbolic link on the server, so the url remains the same.

However, when I change it, the users still see the old image.

What can I do, so that the change will be visible immediately?

Thanks

Magnus

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