Table of contents 1. How to change Varnish options 2. How to change cache retention time in Varnish 3. How to prevent Varnish from creating new cache for different browsers 4. A 403 page got into the Varnish cache and now it is shown to all users 5. How to make Apache logs show real IP address instead of 127.0.0.1 when used with Varnish 6. How...