Enable gzip compression in Nginx

How to enable and test gzip in Nginx.

Official document: ngx_http_gzip_module

Enable gzip

I use Raspberry Pi System Monitor to test gzip module.
Modify /etc/nginx/sites-available/default to enable gzip.
In this case I only change the RpiMonitor website in the server, you can apply it to global by /etc/nginx/nginx.conf

location /rpi {
	proxy_pass http://127.0.0.1:9999/RpiMonitor;
}

Change to

location /rpi {
	proxy_pass http://127.0.0.1:9999/RpiMonitor;
	gzip on;
	gzip_types text/plain text/css application/json application/javascript text/xml application/xml application/xml+rss text/javascript;
	gzip_proxied any;
}

Then reload nginx.conf via sudo nginx -s reload

Test and Result

Before gzip enable:

$ curl -I -H "Accept-Encoding: gzip" http://xxx.xxx.com.tw/rpi/assets/javascriptrrd.wlibs.min.js
HTTP/1.1 200 OK
Server: nginx/1.6.2
Date: Fri, 19 May 2017 07:13:57 GMT
Content-Type: application/javascript
Content-Length: 212364
Connection: keep-alive
Last-Modified: Tue, 30 Dec 2014 06:47:20 GMT
Accept-Ranges: bytes

After gzip enable:

$ curl -I -H "Accept-Encoding: gzip" http://xxx.xxx.com.tw/rpi/assets/javascriptrrd.wlibs.min.js
HTTP/1.1 200 OK
Server: nginx/1.6.2
Date: Fri, 19 May 2017 07:14:37 GMT
Content-Type: application/javascript
Connection: keep-alive
Last-Modified: Tue, 30 Dec 2014 06:47:20 GMT
Content-Encoding: gzip

WebPage Speed Analysis result:

Additional resource - How to: Brotli compression with Nginx