I did a demo from tutorial https://developers.google.com/storage/docs/object-change-notification#_Application_Example. I also enabled the Google Cloud Storage JSON API in cloud console. But I got the result following:
$ gsutil chacl -u [email protected]:FC gs://test-mathbox
No changes to gs://test-mathbox/
$ gsutil notifyconfig watchbucket https://math-box20.appspot.com/ gs://test-mathbox
Watching bucket gs://test-mathbox/ with application URL https://math-box20.appspot.com/ ...
Failure: <HttpError 403 when requesting https://www.googleapis.com/storage/v1beta2/b/test-mathbox/o/watch?alt=json returned "Access Not Configured">.
In that, math-box20 is the id of my GAE application and test-mathbox is a bucket in Google Cloud Storage. Can you help me know why that?