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How does Varnish Caching works?

varnish cache is a web application accelerator also known as a caching HTTP reverse proxy. It can accelerate your website by the factor 300 - 1000. Varnish caches all resources (websites, images, styles, scripts, etc.). Varnish cannot cache the webite if it has set a cookie, but the images, styles and scripts of this webpage are served by varnish without a problem. It cannot cache the request if the resource was loaded over HTTPS. In every other case, we recommend to use the varnish cache.