code: function xhrSimpleDataSerializer(data) {
    var uri = [];
    var key;
    for (key in data) {
      uri.push(encodeURIComponent(key) + '=' + encodeURIComponent(data[key]));
    }
    return uri.join('&');
  }
docs: Copyright (c) 2013-present, Facebook, Inc.
  
  This source code is licensed under the MIT license found in the
  LICENSE file in the root directory of this source tree.
  
  @providesModule xhrSimpleDataSerializer