type PreConditionFailed struct{}

func (e PreConditionFailed) Error() string {
	return "At least one of the pre-conditions you specified did not hold"
}

func isErrPreconditionFailed(err error) bool {
	_, ok := err.(PreConditionFailed)
	return ok
}

// isErrMethodNotAllowed - Check if error type is MethodNotAllowed.
func isErrMethodNotAllowed(err error) bool {

					proxyGetErr := ErrorRespToObjectError(perr, bucket, object)
					if !isErrBucketNotFound(proxyGetErr) && !isErrObjectNotFound(proxyGetErr) && !isErrVersionNotFound(proxyGetErr) &&
						!isErrPreconditionFailed(proxyGetErr) && !isErrInvalidRange(proxyGetErr) {
						replLogIf(ctx, fmt.Errorf("Proxying request (replication) failed for %s/%s(%s) - %w", bucket, object, opts.VersionID, perr))
					}
				}

			return true
		}
		return false
	}
	getOpts.CheckPrecondFn = checkCopyPartPrecondFn
	gr, err := getObjectNInfo(ctx, srcBucket, srcObject, rs, r.Header, getOpts)
	if err != nil {
		if isErrPreconditionFailed(err) {
			return
		}
		if globalBucketVersioningSys.PrefixEnabled(srcBucket, srcObject) && gr != nil {
			// Versioning enabled quite possibly object is deleted might be delete-marker