copySourceIfMatch

Copies the object if its entity tag (ETag) matches the specified tag.

If both the x-amz-copy-source-if-match and x-amz-copy-source-if-unmodified-since headers are present in the request and evaluate as follows, Amazon S3 returns 200 OK and copies the data:

• x-amz-copy-source-if-match condition evaluates to true

• x-amz-copy-source-if-unmodified-since condition evaluates to false