function send(onError, onSuccess, url, method = 'GET', data = null, headers = [], timeout = 60000) {
  let xhr;

  if (window.XMLHttpRequest) {
      // Chrome, Mozilla, Opera, Safari
      xhr = new XMLHttpRequest();
  }  else if (window.ActiveXObject) { 
      // Internet Explorer
      xhr = new ActiveXObject("Microsoft.XMLHTTP");
  }

  xhr.open(method, url, true);


  headers.forEach((header) => {
      xhr.setRequestHeader(header.key, header.value);
  })
  

  xhr.timeout = timeout;

  xhr.onreadystatechange = function () {
      if (xhr.readyState === 4) {
      if(xhr.status >= 400) {
          onError(xhr.statusText)
      } else {
          onSuccess(xhr.responseText)
      }
      }
  }

  xhr.send(data);
}