You just enter the subdomain/hostname under Connect Domain

[
  {
    "AllowedOrigins": [
      "*"
    ],
    "AllowedMethods": [
      "GET",
      "PUT",
      "POST"
    ],
    "AllowedHeaders": [
      "*"
    ]
  }
]

[
  {
    "AllowedOrigins": [
      "*"
    ],
    "AllowedMethods": [
      "GET",
      "PUT",
      "POST"
    ],
    "AllowedHeaders": [
      "*"
    ]
  }
]

    try {
        const url = new URL(request.url);
        const params = url.searchParams;
        const key = params.get('key');

        console.log('key', key);
        const data = await S3.send(new DeleteObjectCommand({
            Bucket: 'fakeBucket',
            Key: key
        }));

        return new Response(JSON.stringify({
            msg: 'I mean, something happened!',
            data: data
        }), {
            status: 200,
            headers: headers
        });

    } catch (err) {
        return new Response(JSON.stringify(
            { 
                msg: 'Error', 
                error: err 
            }), 
            { 
                status: 500, 
                headers: headers 
            });
    }

    try {
        const url = new URL(request.url);
        const params = url.searchParams;
        const key = params.get('key');

        console.log('key', key);
        const data = await S3.send(new DeleteObjectCommand({
            Bucket: 'fakeBucket',
            Key: key
        }));

        return new Response(JSON.stringify({
            msg: 'I mean, something happened!',
            data: data
        }), {
            status: 200,
            headers: headers
        });

    } catch (err) {
        return new Response(JSON.stringify(
            { 
                msg: 'Error', 
                error: err 
            }), 
            { 
                status: 500, 
                headers: headers 
            });
    }

{
    "msg": "Error",
    "error": {
        "$metadata": {
            "attempts": 1,
            "totalRetryDelay": 0
        }
    }
}

{
    "msg": "Error",
    "error": {
        "$metadata": {
            "attempts": 1,
            "totalRetryDelay": 0
        }
    }
}

Failed to load resource: Origin https://sabetudo.ai is not allowed by Access-Control-Allow-Origin. Status code: 200

Failed to load resource: Origin https://sabetudo.ai is not allowed by Access-Control-Allow-Origin. Status code: 200

[
  {
    "AllowedOrigins": [
      "*",
      "https://sabetudo.ai",
      "https://www.sabetudo.ai",
      "http://localhost"
    ],
    "AllowedMethods": [
      "GET",
      "HEAD"
    ],
    "ExposeHeaders": [
      "Content-Type",
      "Access-Control-Allow-Origin",
      "ETag"
    ]
  }
]

[
  {
    "AllowedOrigins": [
      "*",
      "https://sabetudo.ai",
      "https://www.sabetudo.ai",
      "http://localhost"
    ],
    "AllowedMethods": [
      "GET",
      "HEAD"
    ],
    "ExposeHeaders": [
      "Content-Type",
      "Access-Control-Allow-Origin",
      "ETag"
    ]
  }
]