It supports for TLS1.2 and TLS1.3 and legacy TLS 1.0/1.1, supports ALPN ( Application-Layer Protocol Negotiation) and NPN ( Next Protocol Negotiation) for HTTP/2, a PROXY protocol to signal client IP/port to a backend, UNIX domain socket connections to the origin, SNI ( Server Name Indication), with and without wildcard certificates. It terminates TLS/SSL connections by listening on port 443 (the default port for HTTPS connections) and forwards the unencrypted traffic to Varnish Cache, however, it should work with other backends too. The Hitch is a free open source, libev-based, and scalable SSL/TLS proxy designed for Varnish Cache, which currently works on Linux, OpenBSD, FreeBSD, and MacOSX. If you are using Varnish Cache to boost your web application’s performance, you need to install and configure another piece of software called an SSL/TLS termination proxy, to work alongside Varnish Cache to enable HTTPS. Varnish Cache lacks native support for SSL/TLS and other protocols associated with port 443.
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