Webserver not reloaded after position is marked private

[tobst]

server.on("/makecurrentlocationprivate", HTTP_GET, []()
should lead to
String s = "<meta http-equiv='refresh' content='0; url=/'><a href='/'> Go Back </a>"; server.send(200, "text/html", s); //Send web page
when finished, but webserver is not reloaded.

[boldt]

We need a JavaScript-/XHR-based version, since the status code cannot be send twice.