Varnish is an open source reverse HTTP proxy with extensive caching abilities, i.e. a web accelerator. It is frequently used in front of websites to cache webpages in memory.

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The web is moving toward using HTTPS encryption by default. This move has been encouraged by Google, which announced that HTTPS would be a ranking signal. However, moving your website to HTTPS is good for other reasons, too.

Once you start working with the Varnish source code, you will notice that Varnish is not your average run of the mill application. That is not a coincidence.