fs.go

if size >= 0 {
	ranges, err := parseRange(rangeReq, size)
	if err != nil {
		if err == errNoOverlap {
			w.Header().Set("Content-Range", fmt.Sprintf("bytes */%d", size))
		}
		Error(w, err.Error(), StatusRequestedRangeNotSatisfiable)
		return
	}
	if sumRangesSize(ranges) > size {
		// The total number of bytes in all the ranges
		// is larger than the size of the file by
		// itself, so this is probably an attack, or a
		// dumb client. Ignore the range request.
		ranges = nil
	}
	switch {
	case len(ranges) == 1:
		...