var versionNotFound VersionNotFound
	return errors.As(err, &versionNotFound)
}

// isErrSignatureDoesNotMatch - Check if error type is SignatureDoesNotMatch.
func isErrSignatureDoesNotMatch(err error) bool {
	var signatureDoesNotMatch SignatureDoesNotMatch
	return errors.As(err, &signatureDoesNotMatch)
}

// PreConditionFailed - Check if copy precondition failed
type PreConditionFailed struct{}

		Description:    "The difference between the request time and the server's time is too large.",
		HTTPStatusCode: http.StatusForbidden,
	},
	ErrSignatureDoesNotMatch: {
		Code:           "SignatureDoesNotMatch",
		Description:    "The request signature we calculated does not match the signature you provided. Check your key and signing method.",
		HTTPStatusCode: http.StatusForbidden,
	},
	ErrMethodNotAllowed: {

	// expecting a failure during upload.
	response, err = s.client.Do(request)
	c.Assert(err, nil)
	// Since Content-Md5 header was wrong, expecting to fail with "SignatureDoesNotMatch" error.
	verifyError(c, response, "SignatureDoesNotMatch", "The request signature we calculated does not match the signature you provided. Check your key and signing method.", http.StatusForbidden)
}