Or is there a requirement for production-readyness or popularity (e.g. number of servers on the internet running the server) for it to be listed in the book? That would be a valid point, but then maybe it could be mentioned in the beginning of the section (like "The following servers are production-ready and have an estimated deployment percentage of >1% on the web:" or so).
The list of servers supporting QUIC mention only NGINX and Apache, but other servers support QUIC already.
Or is there a requirement for production-readyness or popularity (e.g. number of servers on the internet running the server) for it to be listed in the book? That would be a valid point, but then maybe it could be mentioned in the beginning of the section (like "The following servers are production-ready and have an estimated deployment percentage of >1% on the web:" or so).