vercel.json

{
  "headers": [
    {
      "source": "/sw.js",
      "headers": [
        {
          "key": "Cache-Control",
          "value": "public, max-age=0, must-revalidate"
        }
      ]
    }
  ],
  "rewrites": [{ "source": "/sitemap.xml", "destination": "/api/sitemap" }]
}