Nginx introduced HTTP/2 Server Push with NGINX 1.13.9. To upgrade Nginx to the latest version, 1.14.0, just run
# ee stack upgrade --nginx
You can check the version using
# nginx -v nginx version: nginx/1.14.0 (EasyEngine)
To configure HTTP/2 Server Push, you will have to use TLS(SSL). Almost all modern browsers will only support HTTP/2 over TLS.
You need to add the http2 parameter to the listen directive.
listen 443 ssl http2;
Then you will have to add the http2_push_preload directive with the
fastcgi directive, on EasyEngine installation, this will be in the file
fastcgi_pass php7; http2_push_preload on;
Then reload Nginx using –
nginx -t && nginx -s reload
For WordPress site, you can install this plugin – HTTP/2 Server Push. To verify the setup, you need the nghttp tool. On Ubuntu, the package containing this tool is nghttp2
Run the command
nghttp -ans https://example.com
Following is the output of the command for https://easyengine.io (Truncated for brevity). If you see the asterisk (*) in the requestStart column, you know the server push is working.
sorted by 'complete' id responseEnd requestStart process code size request path 13 +1.31s +66us 1.31s 200 15K / 2 +1.32s * +1.23s 87.81ms 200 4K /wp-includes/js/wp-emoji-release.min.js 6 +1.38s * +1.23s 151.90ms 200 27K /wp-includes/css/dashicons.min.css 8 +1.39s * +1.23s 158.18ms 200 4K /wp-content/uploads/bb-plugin/cache/39791-layout.css
You can read the post mentioned at the start of this article for more details on HTTP/2 Server Push