nginx

server {
    listen 80 default_server;
    listen [::]:80 default_server;
    
    # redirect all HTTP requests to HTTPS with 301 Moved Permanently reponse
    return 301 https://$host$request_uri;
}

server {
    listen 443 ssl https2;
    listen [::]:443 ssl https2;
    
    # certs sent to the client in SERVER HELLO are concatenated in ssl_certificate
    ssl_certificate /etc/letsencrypt/live/example.com/fullchain.pem;
    ssl_certifacte_key /etc/letsencrypt/live/example.com/privkey.pem;
    ssl_session_timeout 1d;
    ssl_session_cache shared:SSL:50m;
    ssl_session_tickets off;

    # Diffie-Hellman parameter for DHE ciphersuites, recommended 2048 bits
    # openssl dhparam -out /etc/letsencrypt/live/example.com/ 2048

    ssl_dhparam /etc/letsenrypt/live/example.com/dhparam.pem;

    
    # intermediate configuration. tweak to your needs.
　　 ssl_protocols TLS1 TLS1.1 TLS1.2;
　　 ssl_ciphers 'ECDHE-ECDSA-CHACHA20-POLY1305:ECDHE-RSA-CHACHA20-POLY1305:ECDHE-ECDSA-AES128-GCM-SHA256:ECDHE-RSA-AES128-GCM-SHA256:ECDHE-ECDSA-AES256-GCM-SHA384:ECDHE-RSA-AES256-GCM-SHA384:DHE-RSA-AES128-GCM-SHA256:DHE-RSA-AES256-GCM-SHA384:ECDHE-ECDSA-AES128-SHA256:ECDHE-RSA-AES128-SHA256:ECDHE-ECDSA-AES128-SHA:ECDHE-RSA-AES256-SHA384:ECDHE-RSA-AES128-SHA:ECDHE-ECDSA-AES256-SHA384:ECDHE-ECDSA-AES256-SHA:ECDHE-RSA-AES256-SHA:DHE-RSA-AES128-SHA256:DHE-RSA-AES128-SHA:DHE-RSA-AES256-SHA256:DHE-RSA-AES256-SHA:ECDHE-ECDSA-DES-CBC3-SHA:ECDHE-RSA-DES-CBC3-SHA:EDH-RSA-DES-CBC3-SHA:AES128-GCM-SHA256:AES256-GCM-SHA384:AES128-SHA256:AES256-SHA256:AES128-SHA:AES256-SHA:DES-CBC3-SHA:!DSS';
　　 ssl_prefer_server_ciphers on;
　　 
　　 add_headers Strict-Transport-Security max-age=15768000;
　　 ssl_stapling on;
　　 ssl_stapling_verify on;

　　 resolver <IP DNS resolver>;
}