token_refresh.js

restApi.interceptors.response.use(
  async response => {
    return response;
  },
  error => {

    if (error.response && error.response.status === 401) {
      console.log('401');

      return renewUserToken(
        username, password
      ).then(res => {
        console.log('NEW TOKEN RECEIVED');
        setRestToken(res.Token);
        // resending the previous request again
        error.config.headers['Access-Token'] = res.Token;
        return axios.request(error.config);
      });
    }

    return Promise.reject(error);
  },
);