server {
    listen 8080;
    server_name _;
    root /usr/share/nginx/html;
    index index.html;

    # Behind a reverse proxy: don't leak the internal port in redirects.
    absolute_redirect off;
    server_tokens off;

    gzip on;
    gzip_types text/css application/javascript application/manifest+json image/svg+xml;

    add_header X-Content-Type-Options "nosniff" always;
    add_header Referrer-Policy "no-referrer" always;
    add_header Content-Security-Policy "default-src 'self'; img-src 'self' data:; style-src 'self'; script-src 'self'; worker-src 'self'; manifest-src 'self'; connect-src 'self'; base-uri 'self'; frame-ancestors 'none'" always;

    location = /healthz {
        access_log off;
        default_type text/plain;
        return 200 "ok\n";
    }

    # Always revalidate the entry points so updates roll out promptly.
    location = /sw.js {
        add_header Cache-Control "no-cache" always;
        add_header X-Content-Type-Options "nosniff" always;
    }
    location = /index.html {
        add_header Cache-Control "no-cache" always;
        add_header X-Content-Type-Options "nosniff" always;
        add_header Referrer-Policy "no-referrer" always;
        add_header Content-Security-Policy "default-src 'self'; img-src 'self' data:; style-src 'self'; script-src 'self'; worker-src 'self'; manifest-src 'self'; connect-src 'self'; base-uri 'self'; frame-ancestors 'none'" always;
    }
    location = /manifest.webmanifest {
        default_type application/manifest+json;
        add_header Cache-Control "no-cache" always;
    }

    location / {
        add_header Cache-Control "public, max-age=3600" always;
        add_header X-Content-Type-Options "nosniff" always;
        try_files $uri $uri/ =404;
    }
}