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

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

Universo Online (UOL) is a Brazilian provider of internet access and content services.

Universo Online (UOL) is a Brazilian provider of internet access and content services.

Skynova (formerly Skymail) is a Brazilian provider of email and cloud services.

Skynova (formerly Skymail) is a Brazilian provider of email and cloud services.

The validity of the SSL certificate has expired.

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.

Gzip (GNU zip) is a file compression algorithm.

The websites redirects visitors to its www subdomain, e.g. from example.com to www.example.com.

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.

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

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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