<!DOCTYPE html>
<html>
<head>
    <meta charset="UTF-8">
    <script type="application/javascript">
            const evtSource = new EventSource("./tracks");

            evtSource.onerror = function(err) {
              console.error("EventSource failed:", err);
            }

            //--- called if message does not have a type
            evtSource.onmessage = function(event) {
              if (event.data.length >0) {
                document.getElementById("data").textContent = event.data;
       