server {
    server_name example.tld;

    listen 80;
    listen [::]:80;

    location / {
        return 301 https://$server_name$request_uri;
    }
}

server {
    server_name example.tld;

    listen 443 ssl http2;
    listen [::]:443 ssl http2;

    ssl_certificate /etc/letsencrypt/live/example.tld/fullchain.pem;
    ssl_certificate_key /etc/letsencrypt/live/example.tld/privkey.pem;
    ssl_trusted_certificate /etc/letsencrypt/live/example.tld/chain.pem;

    ssl_session_timeout 1d;
    ssl_session_cache shared:MozSSL:10m;  # about 40000 sessions
    ssl_session_tickets off;

    ssl_protocols TLSv1.2 TLSv1.3;
    ssl_ciphers "ECDHE-ECDSA-AES256-GCM-SHA384:ECDHE-RSA-AES256-GCM-SHA384:ECDHE-ECDSA-CHACHA20-POLY1305:ECDHE-RSA-CHACHA20-POLY1305:ECDHE-ECDSA-AES128-GCM-SHA256:ECDHE-RSA-AES128-GCM-SHA256:ECDHE-ECDSA-AES256-SHA384:ECDHE-RSA-AES256-SHA384:!aNULL:!eNULL:!EXPORT:!DES:!MD5:!PSK:!RC4";
    ssl_prefer_server_ciphers off;

    ssl_stapling on;
    ssl_stapling_verify on;

    add_header Strict-Transport-Security "max-age=63072000" always;
    # script-src unsafe-inline required by MetaMask
    # style-src oauth-authorization required by OAuth authorization page
    add_header Content-Security-Policy "default-src 'none'; connect-src 'self'; img-src 'self' data:; media-src 'self'; script-src 'self' 'unsafe-inline'; style-src 'self' 'nonce-oauth-authorization'; frame-ancestors 'none'; base-uri 'self'; form-action 'self'";
    add_header X-Content-Type-Options "nosniff";

    client_max_body_size 10M;

    location / {
        proxy_pass http://127.0.0.1:8383;
        proxy_set_header Host $http_host;
        proxy_set_header X-Forwarded-For $remote_addr;
    }
}