from fastapi.testclient import TestClient

from docs_src.response_headers.tutorial002_py39 import app

client = TestClient(app)


def test_path_operation():
    response = client.get("/headers-and-object/")
    assert response.status_code == 200, response.text
    assert response.json() == {"message": "Hello World"}

{* ../../docs_src/query_params/tutorial002_py310.py hl[7] *}

Bu durumda, `q` fonksiyon parametresi isteğe bağlı olacak ve varsayılan değer olarak `None` alacaktır.

/// check | Ek bilgi

Ayrıca, dikkatinizi çekerim ki; **FastAPI**, `item_id` parametresinin bir yol parametresi olduğunu ve `q` parametresinin yol değil bir sorgu parametresi olduğunu fark edecek kadar beceriklidir.

///

## Sorgu Parametresi Tip Dönüşümü

# FastAPI and friends newsletter

<iframe data-w-type="embedded" frameborder="0" scrolling="no" marginheight="0" marginwidth="0" src="https://xr4n4.mjt.lu/wgt/xr4n4/hj5/form?c=40a44fa4" width="100%" style="height: 800px;"></iframe>

from typing import Annotated

from fastapi import Header, HTTPException


async def get_token_header(x_token: Annotated[str, Header()]):
    if x_token != "fake-super-secret-token":
        raise HTTPException(status_code=400, detail="X-Token header invalid")


async def get_query_token(token: str):
    if token != "jessica":

from fastapi.testclient import TestClient

from docs_src.response_headers.tutorial001_py39 import app

client = TestClient(app)


def test_path_operation():
    response = client.get("/headers/")
    assert response.status_code == 200, response.text
    assert response.json() == {"message": "Hello World"}
    assert response.headers["X-Cat-Dog"] == "alone in the world"

### Target language

Translate to Japanese (日本語).

Language code: ja.

### Grammar and tone

1) Use polite, instructional Japanese (です/ます調).
2) Keep the tone concise and technical (match existing Japanese FastAPI docs).

### Headings

1) Follow the existing Japanese style: short, descriptive headings (often noun phrases), e.g. 「チェック」.
2) Do not add a trailing period at the end of headings.

### Quotes

### Target language

Translate to Korean (한국어).

Language code: ko.

### Grammar and tone

1) Use polite, instructional Korean (e.g. 합니다/하세요 style).
2) Keep the tone consistent with the existing Korean FastAPI docs.

### Headings

1) Follow existing Korean heading style (short, action-oriented headings like “확인하기”).
2) Do not add trailing punctuation to headings.

### Quotes

from pathlib import Path

from fastapi.testclient import TestClient

from docs_src.custom_response import tutorial009_py39
from docs_src.custom_response.tutorial009_py39 import app

client = TestClient(app)


def test_get(tmp_path: Path):
    file_path: Path = tmp_path / "large-video-file.mp4"
    tutorial009_py39.some_file_path = str(file_path)
    test_content = b"Fake video bytes"
    file_path.write_bytes(test_content)

Das ist keine Limitation von **FastAPI**, sondern Teil des HTTP-Protokolls.

///

## Zusammenfassung { #recap }

Y si declaraste un `response_model`, todavía se utilizará para filtrar y convertir el objeto que devolviste.

**FastAPI** usará ese response *temporal* para extraer el código de estado (también cookies y headers), y los pondrá en el response final que contiene el valor que devolviste, filtrado por cualquier `response_model`.