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The Apache HTTP Server is an open source web server by the Apache Software Foundation.

Cloudflare Server is a web server developed by Cloudflare.

Masterhost is a Russian web hosting provider.

Hetzner is a German web hosting provider.

Masterhost is a Russian web hosting provider.

Hetzner is a German web hosting provider.

Cloudflare provides a content delivery network.

Masterhost is a Russian internet services provider.

Cloudflare provides DNS servers and other web services.

Masterhost is a Russian internet services provider.

Cloudflare provides an email forwarding service.

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

GlobalSign is an IT security service provider, also operating as SSL certificate authority.

Embedded Cascading Style Sheets define a set of style rules in a <style> element within a web page.

Inline Cascading Style Sheets define style rules directly within an (X)HTML element using the style attribute.

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 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.

HTTP/2 is the second major version of the HTTP network protocol.

The websites redirects visitors to use SSL encryption, e.g. from http://example.com/ to https://example.com/.

Zstandard is a lossless data compression algorithm developed by Yann Collet at Facebook.

HTTP/3 is the third major version of the HTTP network protocol, derived from the QUIC protocol.

The Open Graph protocol, originally developed by Facebook, is an RDFa-based format that enables any web page to become a rich object in a social graph.

Transitional version of HTML.

Windows-1251 is an 8-bit character encoding, designed to cover languages that use the Cyrillic alphabet.

PNG (Portable Network Graphics) is a lossless compression image format, suitable to store graphics with uniformly colored areas, and originally introduced as a free, open-source successor of GIF.

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