router.get('/force_async_error/0',  async function (req, res, next) {
  try{
    await Promise.reject(new Error('my zoom 0'));
  }
  catch(err){
    next(err);
  }
});

router.get('/force_async_error/1', async function (req, res, next) {
  await Promise.reject(new Error('my zoom 1'));
});