ifMatch

Deletes the object if the ETag (entity tag) value provided during the delete operation matches the ETag of the object in S3. If the ETag values do not match, the operation returns a 412 Precondition Failed error.

Expects the ETag value as a string. If-Match does accept a string value of an '*' (asterisk) character to denote a match of any ETag.

For more information about conditional requests, see RFC 7232.