Varnish

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Varnish is a website accelerator platform, which caches info for quicker response times. It’s occasionally referred to as an HTTP reverse proxy as well and it interacts between a web server and an Internet browser. When a visitor accesses a specific web page, its content is requested by the browser, and then the server handles this request and delivers the requested content. If Varnish is enabled for a certain site, it will cache the pages at the first request and in case the user opens a cached page again, the data will be delivered by the accelerator platform instead of the server. The increased speed is an end result of the substantially faster response time that the Varnish platform offers as compared to any web server software. At the same time, this does not mean that the site visitors will keep seeing the exact same content over and over again, since any update on any of the web pages is reflected in the content that the Varnish platform keeps in its memory.