Assigning the empty string and just any non-integer value to the option `s` will cause a `ValueError` exception to be thrawn. In this case Gravatar ignores the option[1] while my implementation returns a HTTP 400 error[2]. [1]: https://www.gravatar.com/avatar/4751ed9aae86881d2b45dd0512c3e14a?s= [2]: https://avatars.bouledef.eu/avatar/4751ed9aae86881d2b45dd0512c3e14a?s=