destinationIfNoneMatch

Renames the object only if the destination does not already exist in the specified directory bucket. If the object does exist when you send a request with If-None-Match:*, the S3 API will return a 412 Precondition Failed error, preventing an overwrite. The If-None-Match header prevents overwrites of existing data by validating that there's not an object with the same key name already in your directory bucket.

Expects the * character (asterisk).