cakephp3 presence of auth token in API request

  /**
   * Login
   */
  public login( username : string,
                password : string,
                captchaResponse : string ) {

    return this.http.post<any>( 'http://api.mydomain.localhost/users/token.json',
                                {
                                  username,
                                  password,
                                  captchaResponse
                                },
                                {
                                  headers : new HttpHeaders()
                                    .set( 'X-Requested-With', 'XMLHttpRequest' )
                                }
    ).pipe( map( response => {
      // Store user details and jwt token in local storage
      // to keep user logged in between page refreshes
      this.user = response.data;
      this.setUser( this.user.profile );
      this.setToken( this.user.token );
      return this.user;
    } ) );
  }