// if x-amz-metadata-directive says COPY then we
	// return the default metadata.
	if isDirectiveCopy(r.Header.Get(xhttp.AmzMetadataDirective)) {
		return defaultMeta, nil
	}

	// Copy is default behavior if not x-amz-metadata-directive is set.
	return defaultMeta, nil
}

// getRemoteInstanceTransport contains a roundtripper for external (not peers) servers
var remoteInstanceTransport atomic.Value