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

Debian is a Linux distribution.

RapidSwitch is a web hosting provider owned by iomart.

iomart is a British cloud computing and web hosting provider. This includes its brand iomartcloud, Switch Media and EQSN.

iomart is a British cloud computing and web hosting provider. This includes its brand iomartcloud, Switch Media and EQSN.

Gandi is a French internet services provider owned by Your.Online.

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

Gzip (GNU zip) is a file compression algorithm.

A strong ETag is an HTTP header field for validation of cached web pages, that indicates a byte-for-byte identical page in the cache.

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/.

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

Transitional version of XHTML.

ISO-8859-1 (informally also called Latin-1) is an 8-bit character set for Western European languages.

UTF-8 (8-bit Unicode Transformation Format) is a variable-length character encoding for Unicode, which is backwards compatible with ASCII.

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.

Commercial entities