Значення параметра шляху `item_id` буде передано у вашу функцію як аргумент `item_id`.

Отже, якщо ви запустите цей приклад і перейдете за посиланням [http://127.0.0.1:8000/items/foo](http://127.0.0.1:8000/items/foo), то побачите відповідь:

```JSON
{"item_id":"foo"}
```

## Параметри шляху з типами { #path-parameters-with-types }

Ви можете оголосити тип параметра шляху у функції, використовуючи стандартні анотації типів Python:

                    "example": {"id": "bar", "value": "The bar tenders"}
                }
            },
        },
    },
)
async def read_item(item_id: str):
    if item_id == "foo":
        return {"id": "foo", "value": "there goes my hero"}
    else:

		return tx.Model(&User{}).Where("id = ?", 100).Update("name", "Foo bar")
	})
	assertEqualSQL(t, `UPDATE "users" SET "name"='Foo bar',"updated_at"='2021-10-18 19:50:09.438' WHERE id = 100 AND "users"."deleted_at" IS NULL`, sql)

	// UpdateColumn
	sql = DB.ToSQL(func(tx *gorm.DB) *gorm.DB {
		return tx.Model(&User{}).Where("id = ?", 100).UpdateColumn("name", "Foo bar")
	})

app = FastAPI()


class Item(BaseModel):
    name: str | None = None
    description: str | None = None
    price: float | None = None
    tax: float = 10.5
    tags: list[str] = []


items = {
    "foo": {"name": "Foo", "price": 50.2},
    "bar": {"name": "Bar", "description": "The bartenders", "price": 62, "tax": 20.2},
    "baz": {"name": "Baz", "description": None, "price": 50.2, "tax": 10.5, "tags": []},
}

    Predicate<String> equalsFoo = Predicates.equalTo("Foo");
    Predicate<String> equalsBar = Predicates.equalTo("Bar");
    Predicate<String> trimEqualsFoo = Predicates.compose(equalsFoo, trim);
    Function<String, String> identity = Functions.identity();

    assertTrue(trimEqualsFoo.apply("Foo"));
    assertTrue(trimEqualsFoo.apply("   Foo   "));
    assertFalse(trimEqualsFoo.apply("Foo-b-que"));

    new EqualsTester()

{* ../../docs_src/header_params/tutorial003_an_py310.py hl[9] *}

Eğer bu *path operation* ile iki HTTP header göndererek iletişim kurarsanız:

```
X-Token: foo
X-Token: bar
```

response şöyle olur:

```JSON
{
    "X-Token values": [
        "bar",
        "foo"
    ]
}
```

## Özet { #recap }

Header'ları `Header` ile tanımlayın; `Query`, `Path` ve `Cookie` ile kullanılan ortak kalıbı burada da kullanın.

import pytest
from fastapi import Depends, FastAPI
from fastapi.responses import StreamingResponse
from fastapi.testclient import TestClient


class Session:
    def __init__(self) -> None:
        self.data = ["foo", "bar", "baz"]
        self.open = True

    def __iter__(self) -> Generator[str, None, None]:
        for item in self.data:
            if self.open:
                yield item
            else:

    assertThat(expected).hasMessageThat().isEqualTo("foo (-1) must not be negative");
  }

  public void testCheckElementIndex_withDesc_tooHigh() {
    IndexOutOfBoundsException expected =
        assertThrows(IndexOutOfBoundsException.class, () -> checkElementIndex(1, 1, "foo"));
    assertThat(expected).hasMessageThat().isEqualTo("foo (1) must be less than size (1)");
  }

    assertThat(expected).hasMessageThat().isEqualTo("foo (-1) must not be negative");
  }

  public void testCheckElementIndex_withDesc_tooHigh() {
    IndexOutOfBoundsException expected =
        assertThrows(IndexOutOfBoundsException.class, () -> checkElementIndex(1, 1, "foo"));
    assertThat(expected).hasMessageThat().isEqualTo("foo (1) must be less than size (1)");
  }

        URL rel = new URL(base, "foo/bar", handler);

        // Assert
        assertEquals(SmbConstants.DEFAULT_PORT, rel.getPort(), "Default port should be applied");
        String actualPath = rel.getPath();
        assertNotNull(actualPath, "Path should not be null");
        // Based on the test output, the actual path is "/bar" when parsing relative spec "foo/bar"