function post(url = ``, data = {}) {
  // Default options are marked with *
  return fetch(url, {
    method: 'POST', // *GET, POST, PUT, DELETE, etc.
    mode: 'cors', // no-cors, cors, *same-origin
    cache: 'no-cache', // *default, no-cache, reload, force-cache, only-if-cached
    headers: {
      'Content-Type': 'application/json; charset=utf-8',
    },
    redirect: 'follow', // manual, *follow, error
    referrer: 'no-referrer', // no-referrer, *client
    body: JSON.stringify(data), // body data type must match "Content-Type" header
  }).then(response => response.json()); // parses response to JSON
}

// window.addEventListener('load', function() {
//   console.log('All assets are loaded');
//   console.log(getUrlVars());
// });