Axios returns a custom object when request status is not OK (https://github.com/axios/axios/#handling-errors):

axios.get('/user/12345')
  .catch(function (error) {
    if (error.response) {
      console.log(error.response.data);
      console.log(error.response.status);
      console.log(error.response.headers);
    }
    // ...
  })

Redaxios on the other hand throws the response directly, as pointed out in comment #48 (comment).

The easiest fix would be just to wrap the response in an object, but for better compatibility we could add some other fields.