1. @httpPost
Future<Response> createObject()

Source 

@httpPost
Future<Response> createObject() async {
  InstanceType instance = _query.entity.instanceType
      .newInstance(new Symbol(""), []).reflectee as InstanceType;
  instance.readFromMap(request.body.asMap());
  _query.values = instance;

  _query = await willInsertObjectWithQuery(_query);
  var result = await _query?.insert();

  return didInsertObject(result);
}