from fastapi import FastAPI

app = FastAPI()


@app.get("/items/{item_id}")
async def read_user_item(
    item_id: str, needy: str, skip: int = 0, limit: int | None = None
):
    item = {"item_id": item_id, "needy": needy, "skip": skip, "limit": limit}

Dans l'exemple ci-dessus, ils ont des valeurs par défaut qui sont `skip=0` et `limit=10`.

Donc, accéder à l'URL :

```
http://127.0.0.1:8000/items/
```

serait équivalent à accéder à l'URL :

```
http://127.0.0.1:8000/items/?skip=0&limit=10
```

Mais si vous accédez à, par exemple :

```
http://127.0.0.1:8000/items/?skip=20
```

Les valeurs des paramètres de votre fonction seront :

					if err != nil {
						err = msgp.WrapError(err, "Embedded", "String")
						return
					}
				default:
					err = dc.Skip()
					if err != nil {
						err = msgp.WrapError(err, "Embedded")
						return
					}
				}
			}
		default:
			err = dc.Skip()
			if err != nil {
				err = msgp.WrapError(err)
				return
			}
		}
	}
	return
}

    [
        (
            "/items/",
            [{"item_name": "Foo"}, {"item_name": "Bar"}, {"item_name": "Baz"}],
        ),
        (
            "/items/?skip=1",
            [{"item_name": "Bar"}, {"item_name": "Baz"}],
        ),
        (
            "/items/?skip=1&limit=1",
            [{"item_name": "Bar"}],
        ),
    ],
)
def test_read_user_item(client: TestClient, path, expected_json):

В примере выше значения по умолчанию равны `skip=0` и `limit=10`.

Таким образом, результат перехода по URL-адресу:

```
http://127.0.0.1:8000/items/
```

будет таким же, как если перейти используя параметры по умолчанию:

```
http://127.0.0.1:8000/items/?skip=0&limit=10
```

Но если вы введёте, например:

```
http://127.0.0.1:8000/items/?skip=20
```

Значения параметров в вашей функции будут:

from typing import Union

from fastapi import FastAPI

app = FastAPI()


@app.get("/items/{item_id}")
async def read_user_item(
    item_id: str, needy: str, skip: int = 0, limit: Union[int, None] = None
):
    item = {"item_id": item_id, "needy": needy, "skip": skip, "limit": limit}

from typing import Annotated

from fastapi import Depends, FastAPI

app = FastAPI()


async def common_parameters(q: str | None = None, skip: int = 0, limit: int = 100):
    return {"q": q, "skip": skip, "limit": limit}


CommonsDep = Annotated[dict, Depends(common_parameters)]


@app.get("/items/")
async def read_items(commons: CommonsDep):
    return commons


@app.get("/users/")

Yukarıdaki örnekte `skip=0` ve `limit=10` varsayılan değere sahiplerdir.

Yani, aşağıdaki bağlantıya gitmek:

```
http://127.0.0.1:8000/items/
```

şu adrese gitmek ile aynı etkiye sahiptir:

```
http://127.0.0.1:8000/items/?skip=0&limit=10
```

Ancak, mesela şöyle bir adresi ziyaret ederseniz:

```
http://127.0.0.1:8000/items/?skip=20
```

	if err != nil {
		t.Fatal(err)
	}
	if len(left) > 0 {
		t.Errorf("%d bytes left over after UnmarshalMsg(): %q", len(left), left)
	}

	left, err = msgp.Skip(bts)
	if err != nil {
		t.Fatal(err)
	}
	if len(left) > 0 {
		t.Errorf("%d bytes left over after Skip(): %q", len(left), left)
	}
}

func BenchmarkMarshalMsgmetacache(b *testing.B) {
	v := metacache{}
	b.ReportAllocs()
	b.ResetTimer()

	if err != nil {
		t.Fatal(err)
	}
	if len(left) > 0 {
		t.Errorf("%d bytes left over after UnmarshalMsg(): %q", len(left), left)
	}

	left, err = msgp.Skip(bts)
	if err != nil {
		t.Fatal(err)
	}
	if len(left) > 0 {
		t.Errorf("%d bytes left over after Skip(): %q", len(left), left)
	}
}

func BenchmarkMarshalMsgrebalanceInfo(b *testing.B) {
	v := rebalanceInfo{}
	b.ReportAllocs()
	b.ResetTimer()