Auth0 Custom Domain Cloudflare Worker

worker.mjs

export default {
  async fetch(request, env) {
    request = new Request(request);
    const url = new URL(request.url);
    url.hostname = env.AUTH0_EDGE_RECORD;
    request.headers.set('cname-api-key', env.CNAME_API_KEY); 

    const response = await fetch(url, request);
    return response;
  }
}

wrangler.toml

[observability.logs]
enabled = true

[vars]
AUTH0_EDGE_RECORD = "xxx.auth0.com"
CNAME_API_KEY = "yyy"