This server now supports TLS 1.3

Implemented with Nginx Mainline and OpenSSL 1.1.1.

Major browsers are not ready for RFC version yet, so TLS 1.2 will be chosen.

Update on 10-12:

--with-openssl-opt='enable-ec_nistp_64_gcc_128 enable-tls1_3'

Looks like this is the key configuration to make Nginx enbale TLSv1.3.