serve.json

{
  "headers": [
    {
      "source": "**",
      "headers": [
        {
          "key": "Vary",
          "value": "Accept-Encoding"
        },
        {
          "key": "Cache-Control",
          "value": "public"
        },
        {
          "key": "Strict-Transport-Security",
          "value": "max-age=31536000; includeSubDomains; preload"
        },
        {
          "key": "X-Content-Type-Options",
          "value": "nosniff"
        },
        {
          "key": "X-Frame-Options",
          "value": "sameorigin"
        },
        {
          "key": "X-XSS-Protection",
          "value": "1"
        }
      ]
    },
    {
      "source": "**/*.@(jpg|jpeg|gif|png|svg|ico|js|css|txt|json)",
      "headers": [
        {
          "key": "Vary",
          "value": "Accept-Encoding"
        },
        {
          "key": "Cache-Control",
          "value": "public,max-age=604800"
        }
      ]
    }
  ]
}