HTTP Strict Transport Security (HSTS) informs browsers that the site should only be accessed using HTTPS.
HTTP/3 is the third major version of the Hypertext Transfer Protocol used to exchange information on the World Wide Web.
MaxMind is a provider of geolocation and online fraud detection tools.
Perl is a family of two high-level, general-purpose, interpreted, dynamic programming languages.
Varnish is a reverse caching proxy.