function sendRequest() {
  const xhr = new XMLHttpRequest();
  var myDiv = document.getElementById("MyDivElement");  
  var url = "../../cgi-bin/TI_2025/lab07/ajax_xml.py" ;
  xhr.open("GET", url, true);	
  xhr.addEventListener("load", e => {
    if ( xhr.status == 200 )  {
         response = xhr.responseXML;
         myDiv.innerHTML += response + "<br/>" ;
         var xmlRoot = response.documentElement ;
         var fnameArray = xmlRoot.getElementsByTagName('fname') ;
         var lnameArray = xmlRoot.getElementsByTagName('lname') ;
         var html = "" ;
         for ( var i=0; i<fnameArray.length; i++) 
             html += fnameArray.item(i).firstChild.data + " " 
                  + lnameArray.item(i).firstChild.data + "<br/>" ;
         myDiv.innerHTML += html ;
         // myDiv.innerHTML += xmlHttp.getAllResponseHeaders() + "<br />" ;
         // myDiv.innerHTML += response + "<br/>";
         // myDiv.innerHTML += xhr.getAllResponseHeaders() + "<br />" ;
    }
  })	  
  xhr.addEventListener("progress", e => {
     myDiv.innerHTML += "Status zadania: " + xhr.readyState + " (progress) <br/>" ;  
  });
 
  xhr.addEventListener("error", e => {
    alert("Nie udało się nawiązać połączenia");
  });

  xhr.send();
}