Static Web Apps configuration to handle HTTP 404 errors with a fallback policy

staticwepapps.config.json

{
  "routes": [   
    {
      "route": "/",
      "allowedRoles": ["anonymous"]
    },
    {
      "route": "/about",
      "allowedRoles": ["anonymous"]
    },
    {
      "route": "/contact-us",
      "allowedRoles": ["anonymous"]
    }
  ],  
  "navigationFallback": {
    "rewrite": "index.html",
    "exclude": ["/images/*.{png,jpg,gif}", "/css/*"]
  },
  "responseOverrides": {
    "400": {
      "rewrite": "/"
    },
    "401": {
      "redirect": "/login",
      "statusCode": 302
    },
    "403": {
      "rewrite": "/"
    },
    "404": {
      "rewrite": "/index.html"
    }
  },
  "globalHeaders": {
    "Content-Type": "charset=UTF-8",
    "content-security-policy": "default-src https: 'self'; object-src 'none'; frame-src 'self'; img-src 'self'",
    "Access-Control-Allow-Origin": "identity.azurestaticapps.net, *.azurestaticapps.net, *.google-analytics.com, *.visualstudio.com",
    "X-Frame-Options": "SAMEORIGIN",
    "Strict-Transport-Security": "max-age=63072000; includeSubDomains; preload",
    "X-Content-Type-Options": "nosniff",
    "x-xss-protection": "1; mode=block",
    "referrer-policy": "same-origin"
  },
  "mimeTypes": {
    ".html": "text/html",
    "custom": "text/html",
    ".json": "text/json",
    ".css": "text/css",
    ".js": "text/javascript"
  }
}