bucket
The bucket region-specific domain name. The bucket domain name including the region name. Please refer to the S3 endpoints reference for format. Note: AWS CloudFront allows specifying an S3 region-specific endpoint when creating an S3 origin. This will prevent redirect issues from CloudFront to the S3 Origin URL. For more information, see the Virtual Hosted-Style Requests for Other Regions section in the AWS S3 User Guide.