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

Node4 is a UK-based IT services and web hosting provider.

Node4 is a UK-based IT services and web hosting provider.

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

External Cascading Style Sheets define style rules in a separate CSS file.

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.

HTML5 is the fifth revision of the HTML standard.

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.

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

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