<td>{{.Histogram.ToHTML (.UserTaskURL true)}}</td>
  </tr>
{{end}}
</table>
</body>
</html>
`))

// UserTaskHandlerFunc returns a HandlerFunc that presents the details of the selected tasks.
func UserTaskHandlerFunc(t *parsedTrace) http.HandlerFunc {
	return func(w http.ResponseWriter, r *http.Request) {
		filter, err := newTaskFilter(r)
		if err != nil {

	mux.HandleFunc("/userregion", UserRegionHandlerFunc(parsed))

	// Task endpoints.
	mux.HandleFunc("/usertasks", UserTasksHandlerFunc(parsed))
	mux.HandleFunc("/usertask", UserTaskHandlerFunc(parsed))

	err = http.Serve(ln, mux)
	logAndDie(fmt.Errorf("failed to start http server: %w", err))
}

func logAndDie(err error) {
	if err == nil {
		os.Exit(0)
	}