location/vercel.json

{
  "routes": [
    {
      "src": "/",
      "dest": "/api",
      "headers": {
        "Access-Control-Allow-Origin": "*",
        "Access-Control-Allow-Methods": "GET,OPTIONS",
        "Access-Control-Allow-Headers": "X-CSRF-Token, X-Requested-With, Accept, Accept-Version, Content-Length, Content-MD5, Content-Type, Date, X-Api-Version"
      }
    }
  ]
}