Belki de öğrenme tarzınıza daha iyi uyduğu için başka kursları tercih edebilirsiniz.

Bazı kurs sağlayıcıları ✨ [**FastAPI destekçileridir**](../help-fastapi.md#sponsor-the-author){.internal-link target=_blank} ✨, bu FastAPI ve **ekosisteminin** sürekli ve sağlıklı bir şekilde **gelişmesini** sağlar.

    "size": "XL"
  }
}
```

#### FastAPI `HTTPException` 🆚 💃 `HTTPException`

**FastAPI** ✔️ 🚮 👍 `HTTPException`.

& **FastAPI**'Ⓜ `HTTPException` ❌ 🎓 😖 ⚪️➡️ 💃 `HTTPException` ❌ 🎓.

🕴 🔺, 👈 **FastAPI**'Ⓜ `HTTPException` ✔ 👆 🚮 🎚 🔌 📨.

👉 💪/⚙️ 🔘 ✳ 2️⃣.0️⃣ & 💂‍♂ 🚙.

, 👆 💪 🚧 🙋‍♀ **FastAPI**'Ⓜ `HTTPException` 🛎 👆 📟.

**FastAPI** では非常に簡単に実現できます (Starletteのおかげで)。ドキュメントを確認して下さい: [テスト](../tutorial/testing.md){.internal-link target=_blank}

テストを加えた後で、**FastAPI** のバージョンをより最新のものにアップグレードし、テストを実行することで全てのコードが正常に動作するか確認できます。

全てが動作するか、修正を行った上で全てのテストを通過した場合、使用している`fastapi` のバージョンをより最新のバージョンに固定できます。

## Starletteについて

`Starlette` のバージョンは固定すべきではありません。

**FastAPI** は、バージョン毎にStarletteのより新しいバージョンを使用します。

よって、最適なStarletteのバージョン選択を**FastAPI** に任せることができます。

* FastAPI ile yapılan bir çok proje insanlar tarafından kullanılıyor.

## Starlette özellikleri

**FastAPI**, <a href="https://www.starlette.io/" class="external-link" target="_blank"><strong>Starlette</strong></a> ile tamamiyle uyumlu ve üzerine kurulu. Yani FastAPI üzerine ekleme yapacağınız herhangi bir Starlette kodu da çalışacaktır.

from fastapi import Depends, FastAPI, Security
from fastapi.security import APIKeyCookie
from fastapi.testclient import TestClient
from pydantic import BaseModel

app = FastAPI()

api_key = APIKeyCookie(name="key")


class User(BaseModel):
    username: str


def get_current_user(oauth_header: str = Security(api_key)):
    user = User(username=oauth_header)
    return user


@app.get("/users/me")

from fastapi import Depends, FastAPI, Security
from fastapi.security import APIKeyCookie
from fastapi.testclient import TestClient
from pydantic import BaseModel

app = FastAPI()

api_key = APIKeyCookie(name="key", description="An API Cookie Key")


class User(BaseModel):
    username: str


def get_current_user(oauth_header: str = Security(api_key)):
    user = User(username=oauth_header)
    return user

`FastAPI` est une classe Python qui fournit toutes les fonctionnalités nécessaires au lancement de votre API.

/// note | "Détails techniques"

`FastAPI` est une classe héritant directement de `Starlette`.

Vous pouvez donc aussi utiliser toutes les fonctionnalités de <a href="https://www.starlette.io/" class="external-link" target="_blank">Starlette</a> depuis `FastAPI`.

///

### Étape 2 : créer une "instance" `FastAPI`

Você também pode usá-lo para gerar código automaticamente para clientes que se comunicam com sua API. Por exemplo, aplicativos front-end, móveis ou IoT.

## Recapitulando, passo a passo

### Passo 1: importe `FastAPI`

```Python hl_lines="1"
{!../../docs_src/first_steps/tutorial001.py!}
```

Using it in your editor is what really shows you the benefits of FastAPI, seeing how little code you have to write, all the type checks, autocompletion, etc.

---

## Install FastAPI

The first step is to install FastAPI.

Make sure you create a [virtual environment](../virtual-environments.md){.internal-link target=_blank}, activate it, and then **install FastAPI**:

<div class="termy">

```console

from fastapi import APIRouter, FastAPI, Request
from fastapi.responses import JSONResponse
from fastapi.testclient import TestClient

app = FastAPI()
router = APIRouter()


@router.route("/items/")
def read_items(request: Request):
    return JSONResponse({"hello": "world"})


app.include_router(router)

client = TestClient(app)


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