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

// UserRegionHandlerFunc returns a HandlerFunc that presents the details of the selected regions.
func UserRegionHandlerFunc(t *parsedTrace) http.HandlerFunc {
	return func(w http.ResponseWriter, r *http.Request) {
		// Construct the filter from the request.
		filter, err := newRegionFilter(r)

	// Region endpoints.
	mux.HandleFunc("/userregions", UserRegionsHandlerFunc(parsed))
	mux.HandleFunc("/userregion", UserRegionHandlerFunc(parsed))

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

	err = http.Serve(ln, mux)