405 Method Not Allowed. Why is Ajax (Post) request not working?

Question

JavaScript

function postAjax(url, data, success) {
  var params = typeof data == 'string' ? data : Object.keys(data).map(
    function (k) { return encodeURIComponent(k) + '=' + encodeURIComponent(data[k]) }
  ).join('&');

  var xhr = new XMLHttpRequest();
  xhr.open('POST', url);
  xhr.onreadystatechange = function () {
    if (xhr.readyState > 3 && xhr.status == 200) { success(xhr.responseText); }
  };
  xhr.setRequestHeader("Access-Control-Allow-Accept", "application/json");
  xhr.setRequestHeader('X-Requested-With', 'XMLHttpRequest');
  xhr.setRequestHeader('Content-Type', 'application/x-www-form-urlencoded');
  xhr.send(params);
  return xhr;
}


postAjax('http://localhost:5500/temp.php', 'p1=1&p2=Hello+World', function (data) { console.log(data); });

Answer 1

Because the server turned it off. More precisely, he knows about this method, but does not want to execute it. Read about 405 http error