**FastAPI** proporciona las mismas `starlette.responses` en `fastapi.responses` sólo que de una manera más conveniente para ti, el desarrollador. En otras palabras, muchas de las responses disponibles provienen directamente de Starlette.


Y como la `Response` puede ser usada frecuentemente para configurar headers y cookies, **FastAPI** también la provee en `fastapi.Response`.

///

## Headers Personalizados

from typing import Annotated, Union

from fastapi import FastAPI, Query

app = FastAPI()


@app.get("/items/")
async def read_items(
    q: Annotated[
        Union[str, None],
        Query(
            title="Query string",
            description="Query string for the items to search in the database that have a good match",
            min_length=3,
        ),
    ] = None,
):

from datetime import datetime, time, timedelta
from uuid import UUID

from fastapi import Body, FastAPI

app = FastAPI()


@app.put("/items/{item_id}")
async def read_items(
    item_id: UUID,
    start_datetime: datetime = Body(),
    end_datetime: datetime = Body(),
    process_after: timedelta = Body(),
    repeat_at: time | None = Body(default=None),
):
    start_process = start_datetime + process_after

from typing import Annotated

from fastapi import FastAPI, Path, Query

app = FastAPI()


@app.get("/items/{item_id}")
async def read_items(
    *,
    item_id: Annotated[int, Path(title="The ID of the item to get", ge=0, le=1000)],
    q: str,
    size: Annotated[float, Query(gt=0, lt=10.5)],
):
    results = {"item_id": item_id}
    if q:
        results.update({"q": q})
    if size:
        results.update({"size": size})

import pytest
from dirty_equals import IsDict
from fastapi.testclient import TestClient

from ...utils import needs_py39


@pytest.fixture(name="client")
def get_client():
    from docs_src.query_params_str_validations.tutorial011_an_py39 import app

    client = TestClient(app)
    return client


@needs_py39
def test_multi_query_values(client: TestClient):
    url = "/items/?q=foo&q=bar"
    response = client.get(url)

from fastapi.testclient import TestClient

from docs_src.additional_responses.tutorial001 import app

client = TestClient(app)


def test_path_operation():
    response = client.get("/items/foo")
    assert response.status_code == 200, response.text
    assert response.json() == {"id": "foo", "value": "there goes my hero"}


def test_path_operation_not_found():
    response = client.get("/items/bar")

import gzip
import json

import pytest
from fastapi import Request
from fastapi.testclient import TestClient

from docs_src.custom_request_and_route.tutorial001 import app


@app.get("/check-class")
async def check_gzip_request(request: Request):
    return {"request_class": type(request).__name__}


client = TestClient(app)


@pytest.mark.parametrize("compress", [True, False])
def test_gzip_request(compress):

from fastapi.testclient import TestClient

from docs_src.handling_errors.tutorial004 import app

client = TestClient(app)


def test_get_validation_error():
    response = client.get("/items/foo")
    assert response.status_code == 400, response.text
    # TODO: remove when deprecating Pydantic v1
    assert (
        # TODO: remove when deprecating Pydantic v1
        "path -> item_id" in response.text

import pytest
from dirty_equals import IsDict
from fastapi.testclient import TestClient

from ...utils import needs_py310


@pytest.fixture(name="client")
def get_client():
    from docs_src.header_params.tutorial003_py310 import app

    client = TestClient(app)
    return client


@needs_py310
@pytest.mark.parametrize(
    "path,headers,expected_status,expected_response",
    [

```Python hl_lines="2  6"
{!../../docs_src/static_files/tutorial001.py!}
```

/// note | "기술적 세부사항"

`from starlette.staticfiles import StaticFiles` 를 사용할 수도 있습니다.

**FastAPI**는 단지 개발자인, 당신에게 편의를 제공하기 위해 `fastapi.static files` 와 동일한 `starlett.static files`를 제공합니다. 하지만 사실 이것은 Starlett에서 직접 온 것입니다.

///

### "마운팅" 이란

"마운팅"은 특정 경로에 완전히 "독립적인" 애플리케이션을 추가하는 것을 의미하는데, 그 후 모든 하위 경로에 대해서도 적용됩니다.