TLS

$ cat /usr/pkg/etc/nginx/nginx.conf

# this nginx installation comes from pkgsrc for both Linux and NetBSD
# you might have to adapt paths to suit your needs... or switch to pkgsrc ;)

user   nginx  nginx;
worker_processes  2;

events {
    worker_connections  1024;
}

http {
    include       /usr/pkg/etc/nginx/mime.types;
    default_type  application/octet-stream;

    sendfile        on;
    keepalive_timeout  65;

    # a little bit of browser leverage doesn't hurt :)
    gzip  on;
    gzip_vary on;
    gzip_types text/plain text/css application/json application/x-javascript text/xml application/xml application/xml+rss text/javascript application/javascript;
    gzip_proxied any;

    server {
        # serve boths IPv4 and IPv6 FWIW
        listen       [::]:80;
        listen       80;

        server_name  localhost example.com *.example.com;

        # this is where letsencrypt will drop the callenge
        location /.well-known/acme-challenge {
                default_type "text/plain";
                root /var/www/letsencrypt;
        }

        # redirect everything else to HTTPS
        location / { return 302 https://$host$request_uri; }
    }

    server {
        listen       [::]:443 ssl;
        listen       443 ssl;

        # you'll have to declare those domains accordingly in letsencrypt conf
        server_name  localhost example.com *.example.com;

        # here lies letsencrypt PEM files
        ssl_certificate      /etc/letsencrypt/live/example.com/fullchain.pem;
        ssl_certificate_key  /etc/letsencrypt/live/example.com/privkey.pem;

        # harden used protocols a little
        ssl_protocols TLSv1 TLSv1.1 TLSv1.2;
        ssl_session_cache    shared:SSL:1m;
        ssl_session_timeout  5m;
        ssl_ciphers 'EECDH+AESGCM:EDH+AESGCM:AES256+EECDH:AES256+EDH';
        ssl_prefer_server_ciphers  on;

        # and then include actual locations
        include sites/*;
    }
}