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OpenBSD httpd is a HTTP server embedded in the OpenBSD operating system.

Nginx (pronounced as "engine X") is a lightweight open source web server developed by Igor Sysoev.

OpenBSD is an open-source Unix-like operating system derived from the Berkeley Software Distribution (BSD).

Hurricane Electric is a US-based provider of internet services.

ProtonMail is a Swiss email service provider.

Let’s Encrypt is a free, automated, and open certificate authority provided by the Internet Security Research Group.

The Internet Protocol version 6 (IPv6) provides amongst others a vastly larger address space than the preceding version 4. We consider a website to support IPv6 if a 128-bit address is assigned to it, regardless of the content delivered at that address.

Gzip (GNU zip) is a file compression algorithm.

A weak ETag is an HTTP header field for validation of cached web pages, that indicates a semantically equivalent page in the cache.

The websites redirects visitors to its www subdomain, e.g. from example.com to www.example.com.

Transitional version of HTML.

JPEG (Joint Photographic Experts Group) is a lossy compression method suitable to store photographic images.

Commercial entities