code: public Acl createDefaultBucketAcl(String bucketName) {
      // [START createDefaultBucketAcl]
      Acl acl =
          storage.createDefaultAcl(bucketName, Acl.of(User.ofAllAuthenticatedUsers(), Role.READER));
      // [END createDefaultBucketAcl]
      return acl;
    }
docs: [VARIABLE "my_unique_bucket"]