gwt - Google Cloud Storage file access control list public-read-write is not working in app engine java -

I am uploading an image in the Google Cloud Storage bucket. I want to give all the user READ permission. Anybody will tell me what I want in the set ACL ()

I want to get that image.

is not a valid predefined ACL for the object, since the object, unlike the bucket, is actually Do not have a written permission in. You can public-read .