def METHOD_NAME(self):
    zaak = ZaakFactory.create()
    ZaakBesluit.objects.create(
        zaak=zaak,
        _besluit_base_url=self.service,
        _besluit_relative_url="besluiten/404",
    )
    url = reverse("admin:zaken_zaak_change", args=(zaak.pk,))
    with requests_mock.Mocker() as m:
        m.get("https://external.nl/api/v1/besluiten/404", status_code=404, json={})
        response = self.app.get(url)
    self.assertEqual(response.status_code, 200)
    self.assertIn("https://external.nl/api/v1/besluiten/404", response.text)