server {
listen 80 deferred backlog=16384 reuseport default_server;
listen 443 ssl deferred backlog=16384 reuseport http2; # No default_server here unless certificate specified here too.
+ listen [::]:80 deferred backlog=16384 reuseport default_server;
+ listen [::]:443 ssl deferred backlog=16384 reuseport http2; # No default_server here unless certificate specified here too.
server_name _;
default_type text/html;