This is Varnish Cache, the high-performance HTTP accelerator.
Documentation and additional information about Varnish is available on https://www.varnish-cache.org/
Technical questions about Varnish and this release should be addressed to <varnish-misc@varnish-cache.org>. Please see https://www.varnish-cache.org/trac/wiki/Contributing for how to contribute patches and report bugs.
Questions about commercial support and services related to Varnish should be addressed to <sales@varnish-software.com>.