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Approximately 10 days ago Nginx 1.13.9 was released with official HTTP/2 Server Push support. If you haven't updated yet, you can via centmin.sh...
http://nginx.org/en/CHANGES Changes with nginx 1.13.9 20 Feb 2018 *) Feature: HTTP/2 server push...
Just a few hours ago, CloudFlare announced there support for HTTP/2 Server Push. Seems as CloudFlare is using there own HTTP/2 Server Push...