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Linux / Unix Curl: Find Out If a Website Is Using Gzip / Deflate Support

When content is compressed, downloads are faster because the files are smaller – in many cases, less than a quarter the size of the original. This is very useful for JavaScript and CSS files (including html), faster downloads translates into faster rendering of web pages for end-user.

How do I find out if a web-page is gzipped or compressed using Linux or Unix command line utility called curl? How do I make sure mod_deflate or mod_gzip is working on Apache or Nginx web server running on a Unix-like system?