text: const form = new FormData();
  form.append("foo", "test/fixtures/files/hello.txt");
  
  const options = {
    method: "POST",
    headers: {"content-type": "multipart/form-data; boundary=---011000010111000001101001"}
  };
  
  options.body = form;
  
  fetch("http://mockbin.com/har", options)
    .then(response => response.json())
    .then(response => console.log(response))
    .catch(err => console.error(err));
  