Sending XML post quest failed

I didn’t know if it’s backend or frontend issue well its interrelated, I was trying to send post XML request o the url in the code below it did’t work its just I am new to XML AND I don’t know what’s wrong, thanks

<!DOCTYPE html>

<h2>The XMLHttpRequest Object</h2>
<button type="button" onclick="loadDoc()">Request data</button>

<p id="demo"></p>
function loadDoc() {
  const xhttp = new XMLHttpRequest();
  xhttp.onload = function() {
    document.getElementById("demo").innerHTML = this.responseText;
  const data = '<query key="q1" enable-multiple-hits="true">' +
  '<unstructured_citation>Hungate, B. A., &amp; Hampton, H. M. (2012). Ecosystem services: Valuing ecosystems for climate. Nature Climate Change, 2(3), 151-152.
  </unstructured_citation>' +
const url='';"POST", url);
  xhttp.setRequestHeader("Content-type", "application/x-www-form-urlencoded");


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