s3://bucket/key -> https://bucket.s3.amazonaws.com/key (virtual-hosted style, anonymous public buckets only). gs://bucket/key -> https://storage.googleapis.com/bucket/key. http(s):// is returned as-is.
s3://bucket/key -> https://bucket.s3.amazonaws.com/key (virtual-hosted style, anonymous public buckets only). gs://bucket/key -> https://storage.googleapis.com/bucket/key. http(s):// is returned as-is.