server {
  listen 80;
  server_name _;

  root /usr/share/nginx/html;
  index index.html;

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

  # Optional: cache static assets
  location ~* \.(?:js|css|png|jpg|jpeg|gif|ico|svg)$ {
    try_files $uri =404;
    expires 30d;
    add_header Cache-Control "public, max-age=2592000, immutable";
  }
}