ssl_certificate /etc/letsencrypt/live/domain_name/fullchain.pem;
ssl_certificate_key /etc/letsencrypt/live/domain_name/privkey.pem;

ssl_dhparam /etc/letsencrypt/ssl-dhparams.pem;
ssl_prefer_server_ciphers on;
ssl_ciphers "ECDHE-ECDSA-AES128-GCM-SHA256:ECDHE-RSA-AES128-GCM-SHA256:ECDHE-ECDSA-AES256-GCM-SHA384:ECDHE-RSA-AES256-GCM-SHA384:ECDHE-ECDSA-CHACHA20-POLY1305:ECDHE-RSA-CHACHA20-POLY1305:DHE-RSA-AES128-GCM-SHA256:DHE-RSA-AES256-GCM-SHA384";
ssl_stapling on;
ssl_stapling_verify on;
ssl_trusted_certificate /etc/letsencrypt/lets-encrypt-x3-cross-signed.pem;
add_header Strict-Transport-Security "max-age=31536000" always;
ssl_session_cache   shared:SSL:40m;
ssl_session_timeout 4h;
ssl_session_tickets on;