AjaxVanillaCall.js

params = "token=palomitas";

xmlhttp = new XMLHttpRequest();


xmlhttp.onreadystatechange = function() {
  if (xmlhttp.readyState == 4 && xmlhttp.status == 200) {
    document.getElementById("mydiv").innerHTML = xmlhttp.responseText;
  }
};

xmlhttp.open("POST", "https://itserver.transtelco.net/wrike/api_test", true);

xmlhttp.setRequestHeader("Content-Type", "application/x-www-form-urlencoded");

xmlhttp.send(params);