AmazonS3におけるetagとmd5の関係をまとめてみた · DQNEO日記公式APIリファレンスによると ETag The entity tag is a hash of the object. The ETag only reflects changes to the contents of an object, not its metadata. The ETag is determined when an object is created. For objects created by the PUT Object operation and the POST Object operation, the ETag is a quoted, 32-digit hexadecimal string representing the MD5 digest of the object data. For other objects, the ETag may o
