copySourceIfModifiedSince

Copies the object if it has been modified since the specified time.

If both the x-amz-copy-source-if-none-match and x-amz-copy-source-if-modified-since headers are present in the request and evaluate as follows, Amazon S3 returns the 412 Precondition Failed response code:

• x-amz-copy-source-if-none-match condition evaluates to false

• x-amz-copy-source-if-modified-since condition evaluates to true