gzip

Enable Gzip in Amazon Linux
How to enable gzip on Plesk Nginx

To check if a web site have gzip enabled, run

curl -I -H 'Accept-Encoding: gzip,deflate' https://YOUR_DOMAIN.EXTN

When you have no GZIP enabled, you will see error as follows

boby@hon-pc-01:~$ curl -I -H 'Accept-Encoding: gzip,deflate' https://serverok.in
curl: (7) Failed to connect to serverok.in port 443: Connection refused
boby@hon-pc-01:~$ 

With gzip enabled, you see something like following

boby@hon-pc-01:~$ curl -I -H 'Accept-Encoding: gzip,deflate' https://serverok.in
HTTP/1.1 200 OK
Server: nginx/1.10.3 (Ubuntu)
Date: Sat, 23 Dec 2017 16:53:49 GMT
Content-Type: text/html; charset=UTF-8
Connection: keep-alive
Link: ; rel="https://api.w.org/"
Link: ; rel=shortlink
Strict-Transport-Security: max-age=31536000; includeSubDomains
Content-Encoding: gzip

boby@hon-pc-01:~$ 

To enable gzip on nginx web server, i added following to server block

gzip          on;
gzip_comp_level     5;
gzip_min_length     256;
gzip_types
    application/atom+xml
    application/javascript
    application/json
    application/rss+xml
    application/vnd.ms-fontobject
    application/x-font-ttf
    application/x-font-opentype
    application/x-font-truetype
    application/x-javascript
    application/x-web-app-manifest+json
    application/xhtml+xml
    application/xml
    font/eot
    font/opentype
    font/otf
    image/svg+xml
    image/x-icon
    image/vnd.microsoft.icon
    text/css
    text/plain
    text/javascript
    text/x-component;
gzip_disable  "MSIE [1-6]\.(?!.*SV1)";