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

DigitalOcean is a US-based web hosting provider.

DigitalOcean is a US-based web hosting provider.

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

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

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

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.

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

Transitional version of HTML.

TIS-620 (Thai Industrial Standard 620-2533) is a character set for the Thai language.

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