text: const form = new FormData();
  form.append("foo", "bar");
  
  fetch("http://mockbin.com/har", {
    "method": "POST",
    "headers": {
      "Content-Type": "multipart/form-data; boundary=---011000010111000001101001"
    }
  })
  .then(response => {
    console.log(response);
  })
  .catch(err => {
    console.error(err);
  });
  