Version:    resyncMetaVersion,
	}
}

var contentRangeRegexp = regexp.MustCompile(`bytes ([0-9]+)-([0-9]+)/([0-9]+|\\*)`)

// parse size from content-range header
func parseSizeFromContentRange(h http.Header) (sz int64, err error) {
	cr := h.Get(xhttp.ContentRange)
	if cr == "" {
		return sz, fmt.Errorf("Content-Range not set")
	}
	parts := contentRangeRegexp.FindStringSubmatch(cr)