// row. They have an output for each input row.
//
// Some types of a queries are not valid. For example, an aggregation
// function combined with a row function is meaningless ("AVG(s.Age) +
// s.Salary"). Analysis determines if such a scenario exists so an
// error can be returned.

var (
	// Fatal error for query processing.
	errNestedAggregation      = errors.New("Cannot nest aggregations")

    response = client.get("/items?id=isbn-9781529046137")
    assert response.status_code == 200, response.text
    assert response.json() == {
        "id": "isbn-9781529046137",
        "name": "The Hitchhiker's Guide to the Galaxy",
    }


def test_get_item_does_not_exist(client: TestClient):
    response = client.get("/items?id=isbn-nope")
    assert response.status_code == 200, response.text

        }
    ]
}
```

## Zusammenfassung { #summary }

Sie können **Pydantic-Modelle** verwenden, um **Query-Parameter** in **FastAPI** zu deklarieren. 😎

/// tip | Tipp

Spoiler-Alarm: Sie können auch Pydantic-Modelle verwenden, um Cookies und Header zu deklarieren, aber darüber werden Sie später im Tutorial lesen. 🤫

Asia/Thimbu Asia/Thimphu Asia/Tokyo Asia/Tomsk Asia/Ujung_Pandang Asia/Ulaanbaatar Asia/Ulan_Bator Asia/Urumqi Asia/Ust-Nera Asia/Vientiane Asia/Vladivostok Asia/Yakutsk Asia/Yangon Asia/Yekaterinburg Asia/Yerevan Atlantic/Azores Atlantic/Bermuda Atlantic/Canary Atlantic/Cape_Verde Atlantic/Faeroe Atlantic/Faroe Atlantic/Jan_Mayen Atlantic/Madeira Atlantic/Reykjavik Atlantic/South_Georgia Atlantic/St_Helena Atlantic/Stanley Australia/ACT Australia/Adelaide Australia/Brisbane Australia/Broken_Hill Australia/Canberra...

Then with `random.choice()` we can get a **random value** from the list, so, we get a tuple with `(id, name)`. It will be something like `("imdb-tt0371724", "The Hitchhiker's Guide to the Galaxy")`.

Then we **assign those two values** of the tuple to the variables `id` and `name`.

So, if the user didn't provide an item ID, they will still receive a random suggestion.

Затем с `random.choice()` можно получить **случайное значение** из списка — то есть кортеж вида `(id, name)`. Это будет что‑то вроде `("imdb-tt0371724", "The Hitchhiker's Guide to the Galaxy")`.

После этого мы **распаковываем** эти два значения кортежа в переменные `id` и `name`.

Так что, если пользователь не передал ID элемента, он всё равно получит случайную рекомендацию.

Se você definir como `--forwarded-allow-ips="*"`, ele confiará em todos os IPs de entrada.

Se o seu **servidor** estiver atrás de um **proxy** confiável e somente o proxy falar com ele, isso fará com que ele aceite seja qual for o IP desse **proxy**.

<div class="termy">

```console
$ fastapi run --forwarded-allow-ips="*"

Dann können wir mit `random.choice()` einen **zufälligen Wert** aus der Liste erhalten, also bekommen wir ein Tuple mit `(id, name)`. Es wird etwas wie `("imdb-tt0371724", "The Hitchhiker's Guide to the Galaxy")` sein.

Dann **weisen wir diese beiden Werte** des Tupels den Variablen `id` und `name` zu.

Wenn der Benutzer also keine Artikel-ID bereitgestellt hat, erhält er trotzdem einen zufälligen Vorschlag.

Em seguida, com `random.choice()` podemos obter um **valor aleatório** da lista, então obtemos uma tupla com `(id, name)`. Será algo como `("imdb-tt0371724", "The Hitchhiker's Guide to the Galaxy")`.

Depois **atribuímos esses dois valores** da tupla às variáveis `id` e `name`.

Assim, se o usuário não fornecer um ID de item, ele ainda receberá uma sugestão aleatória.

			}
			return spd
		}(),
	}}

	for i, v := range vectors {
		var hdr Header
		hdr.PAXRecords = v.inputHdrs
		r := strings.NewReader(v.inputData + "#") // Add canary byte
		tr := Reader{curr: &regFileReader{r, int64(r.Len())}}
		got, err := tr.readGNUSparsePAXHeaders(&hdr)
		if !slices.Equal(got, v.wantMap) {