Received the email from Cloudflare. The Cloudflare edge supports the draft version of the IETF QUIC and HTTP/3 standards. You can read more about HTTP/3 (including how to configure clients like Google Chrome and curl to use it) on our blog.
It is a record of how I build an Nginx with Brotli compression and TLS 1.3 support. I use it on my Linode VPS. It is a Nanon type of VPS at Fremont, CA, USA. 1GB RAM, 25GB storage, 1 CPU. Ubuntu 18.04 LTS was installed on it.