///

Now, get the user data from the (fake) database, using the `username` from the form field.

If there is no such user, we return an error saying "Incorrect username or password".

For the error, we use the exception `HTTPException`:

//// tab | Python 3.10+

```Python hl_lines="3  79-81"
{!> ../../docs_src/security/tutorial003_an_py310.py!}
```

///

Rufen Sie nun die Benutzerdaten aus der (gefakten) Datenbank ab, für diesen `username` aus dem Formularfeld.

Wenn es keinen solchen Benutzer gibt, geben wir die Fehlermeldung „Incorrect username or password“ zurück.

Für den Fehler verwenden wir die Exception `HTTPException`:

//// tab | Python 3.10+

```Python hl_lines="3  79-81"
{!> ../../docs_src/security/tutorial003_an_py310.py!}
```

errors.failed_to_send_testmail=Failed to send the test mail.
errors.could_not_find_backup_index=Could not find index for backup.
errors.no_user_for_changing_password=The current password is incorrect.
errors.failed_to_change_password=Failed to change your password.
errors.unknown_version_for_upgrade=Unknown version information.
errors.failed_to_upgrade_from=Failed to upgrade from {0}: {1}

errors.failed_to_send_testmail=Failed to send the test mail.
errors.could_not_find_backup_index=Could not find index for backup.
errors.no_user_for_changing_password=The current password is incorrect.
errors.failed_to_change_password=Failed to change your password.
errors.unknown_version_for_upgrade=Unknown version information.
errors.failed_to_upgrade_from=Failed to upgrade from {0}: {1}

			}

			for i, hdr := range hdrs {
				if i >= len(v.headers) {
					t.Fatalf("entry %d: unexpected header:\ngot %+v", i, *hdr)
				}
				if !reflect.DeepEqual(*hdr, *v.headers[i]) {
					t.Fatalf("entry %d: incorrect header:\ngot  %+v\nwant %+v", i, *hdr, *v.headers[i])
				}
			}
			if len(hdrs) != len(v.headers) {
				t.Fatalf("got %d headers, want %d headers", len(hdrs), len(v.headers))
			}

errors.failed_to_send_testmail=Échec de l'envoi du courrier de test.
errors.could_not_find_backup_index=Impossible de trouver l'index pour la sauvegarde.
errors.no_user_for_changing_password=Le mot de passe actuel est incorrect.
errors.failed_to_change_password    = Échec de la modification de votre mot de passe.
errors.unknown_version_for_upgrade  = Informations sur la version inconnue.

		"['abc-x_1##@(*&(#*))/\\']",
	}
	for i, tc := range validCases {
		err := p.ParseString(tc, &k)
		if err != nil {
			t.Fatalf("%d: %v", i, err)
		}
		if string(*k.Lit) == "" {
			t.Fatalf("Incorrect parse %#v", k)
		}
		// repr.Println(k, repr.Indent("  "), repr.OmitEmpty(true))
	}

	invalidCases := []string{
		"['abc'']",
		"['-abc'sc']",
		"[abc']",
		"['ac]",
	}

        assertFalse(greater.equals(t));
      }
    }
  }

  /**
   * Returns a collection that simulates concurrent modification by having its size method return
   * incorrect values. This is useful for testing methods that must treat the return value from
   * size() as a hint only.
   *
   * @param delta the difference between the true size of the collection and the values returned by

* **Validate** the returned data.
    * If the data is invalid (e.g. you are missing a field), it means that *your* app code is broken, not returning what it should, and it will return a server error instead of returning incorrect data. This way you and your clients can be certain that they will receive the data and the data shape expected.
* Add a **JSON Schema** for the response, in the OpenAPI *path operation*.

	s := NewScanner(strings.NewReader(text + "\n"))
	s.Buffer(make([]byte, 100), 3*MaxScanTokenSize)
	for s.Scan() {
		token := s.Text()
		if token != text {
			t.Errorf("scan got incorrect token of length %d", len(token))
		}
	}
	if s.Err() != nil {
		t.Fatal("after scan:", s.Err())
	}
}

// negativeEOFReader returns an invalid -1 at the end, as though it