SSL configuration for letsencrypt on serverpilot managed server with http/2 support

appname.ssl.conf

server {
    listen 443 ssl http2;
    listen [::]:443 ssl http2;
    server_name  domainname.com www.domainname.com;

    # letsencrypt certificates
    ssl_certificate      /etc/letsencrypt/live/domainname.com/fullchain.pem;
    ssl_certificate_key  /etc/letsencrypt/live/domainname.com/privkey.pem;

        #SSL Optimization
        ssl_session_timeout 1d;
        ssl_session_cache shared:SSL:20m;
        ssl_session_tickets off;

        # modern configuration
        ssl_protocols TLSv1 TLSv1.1 TLSv1.2;
        ssl_prefer_server_ciphers on;

        ssl_ciphers 'ECDHE-RSA-AES128-GCM-SHA256:ECDHE-ECDSA-AES128-GCM-SHA256:ECDHE-RSA-AES256-GCM-SHA384:ECDHE-ECDSA-AES256-GCM-SHA384:DHE-RSA-AES128-GCM-SHA256:DHE-DSS-AES128-GCM-SHA256:kEDH+AESGCM:ECDHE-RSA-AES128-SHA256:ECDHE-ECDSA-AES128-SHA256:ECDHE-RSA-AES128-SHA:ECDHE-ECDSA-AES128-SHA:ECDHE-RSA-AES256-SHA384:ECDHE-ECDSA-AES256-SHA384:ECDHE-RSA-AES256-SHA:ECDHE-ECDSA-AES256-SHA:DHE-RSA-AES128-SHA256:DHE-RSA-AES128-SHA:DHE-DSS-AES128-SHA256:DHE-RSA-AES256-SHA256:DHE-DSS-AES256-SHA:DHE-RSA-AES256-SHA:!aNULL:!eNULL:!EXPORT:!DES:!RC4:!3DES:!MD5:!PSK'; 

        # OCSP stapling 
        ssl_stapling on; 
        ssl_stapling_verify on; 

        # verify chain of trust of OCSP response 
        ssl_trusted_certificate /etc/letsencrypt/live/domainname.com/chain.pem;
        #root directory and logfiles 
        root /srv/users/serverpilot/apps/APP_NAME/public; 

        access_log /srv/users/serverpilot/log/APP_NAME/nginx.access.log main; 
        error_log /srv/users/serverpilot/log/APP_NAME/nginx.error.log; 

        #proxyset 
        proxy_set_header Host $host;
        proxy_set_header X-Real-IP $remote_addr;
        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
        proxy_set_header X-Forwarded-SSL on; 
        proxy_set_header X-Forwarded-Proto $scheme; 

        #includes 
        include /etc/nginx-sp/vhosts.d/APP_NAME.d/*.nonssl_conf; 
        include /etc/nginx-sp/vhosts.d/APP_NAME.d/*.conf; 
} 

Full installation instructions: https://www.robertwent.com/blog/using-letsencrypt-serverpilot/