login = () => {
    return axios({
      method: 'post',
      url: `https://${this.login.credentials.apiUrl}/restful/u/login`,
      headers: {
        'Content-Type': 'application/json',
      },
      data: {
        username: this.login.credentials.user,
        password: this.login.credentials.password
      },
      withCredentials: true,
    })
  };

  logout = () => {
    return axios({
      method: 'post',
      url: `https://${this.login.credentials.apiUrl}/restful/u/logout`,
      headers: Object.assign(
        {},
        this.login.requestHeaders, // CSRF-token
        {'Content-Type': 'application/json'}
      ),
      withCredentials: true
    })
  };