I have bought a domain on CloudFlare and created an R2 bucket, but I am lost in config...

export default {
  async fetch(request: Request, env: any) {
    // For example, the request URL my-worker.account.workers.dev/image.png
    const url = new URL(request.url);
    const key = url.pathname.slice(1);
    // Retrieve the key "image.png"
    const object = await env.MY_BUCKET.get(key);
    
    if (object === null) {
      return new Response('Object Not Found', { status: 404 });
    }

    const headers = new Headers();
    object.writeHttpMetadata(headers);
    headers.set('etag', object.httpEtag);

    return new Response(object.body, {
      headers,
    });
  },
};

export default {
  async fetch(request: Request, env: any) {
    // For example, the request URL my-worker.account.workers.dev/image.png
    const url = new URL(request.url);
    const key = url.pathname.slice(1);
    // Retrieve the key "image.png"
    const object = await env.MY_BUCKET.get(key);
    
    if (object === null) {
      return new Response('Object Not Found', { status: 404 });
    }

    const headers = new Headers();
    object.writeHttpMetadata(headers);
    headers.set('etag', object.httpEtag);

    return new Response(object.body, {
      headers,
    });
  },
};