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A way to implement conditional donut caching or server side content targeting using varnish

> Even problems this article is trying to solve is related to Adobe AEM Personalization, but the technique it uses is AEM agnostic. ## About Varnish [Varnish]( has been widely used nowadays as a caching HTTP reverse proxy. I use Varnish to act as second level [Load Balancer]( behind [F5](, traffic controll