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

Tencent is a Chinese IT and telecommunication company. This includes its QQ brand and others.

Tencent is a Chinese IT and telecommunication company. This includes its QQ brand and others.

The validity of the SSL certificate has expired.

DigiCert is an SSL certificate authority. This includes Verizon, whose Enterprise SSL Business has been acquired by DigiCert.

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

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.

HTTP Strict Transport Security (HSTS) defines a mechanism enabling web sites to declare themselves accessible only via secure connections.

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

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.

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