[vlovich123]

SHA256 has the benefit that you can generate the ETAG deterministically without needing to maintain a database (i.e. content-based hashing). That way you also don’t need to track if the content changes which reduces bugs that might creep in with UUIDs. Also, if typically you only update a subset of all files, then aside from not needing to keep track of assigned UUIDs per file, you can do a partial update. Reasons to do content-based hashing are not invalidated because of a new UUID format.