server {
    listen 80;
    server_name _;
    root /usr/share/nginx/html;
    index index.html;

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

    location / {
        try_files $uri $uri/ /index.html;
    }

    location ~* \.(?:css|js|json|txt)$ {
        expires 5m;
        add_header Cache-Control "public, max-age=300";
        try_files $uri =404;
    }

    add_header X-Content-Type-Options nosniff always;
    add_header Referrer-Policy strict-origin-when-cross-origin always;
    add_header X-Frame-Options DENY always;
}