We implemented HTTP/2 server push in nghttpx and we enabled server push in nghttp2.org site. When you access https://nghttp2.org via HTTP/2 protocol, CSS file /stylesheets/screen.css is pushed to client. If you inspect the response header closely, you will find Link header field like this: We operate nghttp2.org site using nghttpx proxy server in front and nginx on its back. The Link header field