js

function loadDoc() {
  var user = document.getElementById('name').value;
  var password = document.getElementById('password').value;
  var xhttp = new XMLHttpRequest();
  xhttp.onreadystatechange = function() {
    if (xhttp.readyState == 4 && xhttp.status == 200) {
      document.getElementById("demo").innerHTML = xhttp.responseText;
    }
  };
  xhttp.open("POST", "http://103.28.119.20:8080/SecurityApi/system/login", true);
  xhttp.send(btoa(user + ":" + password));
}