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JavaScript is a lightweight, object-oriented, cross-platform scripting language, often used within web pages.

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

AT&T is a US-based multinational company providing among others IT and telecommunication services.

AT&T is a US-based multinational company providing among others IT and telecommunication services.

Cloudflare provides DNS servers and other web services.

The SSL certificate is invalid because it is not issued for the domain where it is used.

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

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

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.

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

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

Basic version of XHTML, meant to support constrained devices.

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

Commercial entities