title: Google Cloud Vision ML via REST
body: <p>I'm taking my first steps with Vision ML and using the REST interface. (<a href="https://vision.googleapis.com/v1/files:annotate" rel="nofollow noreferrer">https://vision.googleapis.com/v1/files:annotate</a>). As API key I provide the key from the Firebase project settings. In the Authorization Bearer, I supply the token from Firebase-Auth after sign-in.</p>
  <p>When accessing Annotate I get a 403 (Permission_Denied) error message back:
  Error opening file: gs://######.appspot.com/MyFile.tiff.</p>
  <p>The object is available in the corresponding bucket and it is not blocked due to the Firebase Storage rules.</p>
  <p>Can I pass a Firebase token in this REST interface at all?</p>
  <p>How do I make sure that the service account can access the storage?</p>
  <p>Thank you for any hint</p>