// For providing ranged content
						start, rangeLen, err := rs.GetOffsetLength(ci.Size)
						if err != nil {
							start, rangeLen = 0, ci.Size
						}

						// Set content length.
						w.Header().Set(xhttp.ContentLength, strconv.FormatInt(rangeLen, 10))
						if rs != nil {
							contentRange := fmt.Sprintf("bytes %d-%d/%d", start, start+rangeLen-1, ci.Size)
							w.Header().Set(xhttp.ContentRange, contentRange)