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

    # SPA/Single-File: alles auf index.html
    location / {
        try_files $uri /index.html;
    }

    # kleines Tool, aber sinnvolle Header
    add_header X-Content-Type-Options "nosniff" always;
    add_header Referrer-Policy "no-referrer" always;
    gzip on;
    gzip_types text/html text/css application/javascript image/svg+xml;
}