subdomain for attaching dns cname on S3 static hosting and bucket name
S3 bucketname : aws.aaa.com (make public, everyone has a read permission) aws.aaa.com cname aws.aaa.com.s3.ap-northeast-2.amazonaws.com S3 bucketname : yoursubdomain yoursubdomain’s cname must be yoursubdomain.s3.yours3resion.amanzonaws.com