Verwenden Sie diese, um eine Funktion zu dekorieren, die ein einziges `yield` hat.

Das ist es auch, was **FastAPI** intern für Abhängigkeiten mit `yield` verwendet.

Aber Sie müssen die Dekoratoren nicht für FastAPI-Abhängigkeiten verwenden (und das sollten Sie auch nicht).

FastAPI erledigt das intern für Sie.

# Geçmişi, Tasarımı ve Geleceği

Bir süre önce, <a href="https://github.com/fastapi/fastapi/issues/3#issuecomment-454956920" class="external-link" target="_blank">bir **FastAPI** kullanıcısı sordu</a>:

> Bu projenin geçmişi nedir? Birkaç hafta içinde hiçbir yerden harika bir şeye dönüşmüş gibi görünüyor [...]

İşte o geçmişin bir kısmı.

## Alternatifler

/// tip

需要注意，如果你直接反馈一个response对象，而不是使用`Response`入参，FastAPI则会直接反馈你封装的response对象。

所以你需要确保你响应数据类型的正确性，如：你可以使用`JSONResponse`来兼容JSON的场景。

同时，你也应当仅反馈通过`response_model`过滤过的数据。

///

### 更多信息

/// note | "技术细节"

你也可以使用`from starlette.responses import Response` 或者 `from starlette.responses import JSONResponse`。

为了方便开发者，**FastAPI** 封装了相同数据类型，如`starlette.responses` 和 `fastapi.responses`。不过大部分response对象都是直接引用自Starlette。

---

## Install FastAPI

Langkah pertama adalah dengan meng-install FastAPI.

Untuk tutorial, kamu mungkin hendak meng-installnya dengan semua pilihan fitur dan dependensinya:

<div class="termy">

```console
$ pip install "fastapi[all]"

---> 100%
```

</div>

from fastapi import FastAPI
from fastapi.responses import JSONResponse
from pydantic import BaseModel


class Item(BaseModel):
    id: str
    value: str


class Message(BaseModel):
    message: str


app = FastAPI()


@app.get(
    "/items/{item_id}",
    response_model=Item,
    responses={
        404: {"model": Message, "description": "The item was not found"},
        200: {

from typing import Union

from fastapi import Body, FastAPI, status
from fastapi.responses import JSONResponse
from typing_extensions import Annotated

app = FastAPI()

items = {"foo": {"name": "Fighters", "size": 6}, "bar": {"name": "Tenders", "size": 3}}


@app.put("/items/{item_id}")
async def upsert_item(
    item_id: str,
    name: Annotated[Union[str, None], Body()] = None,
    size: Annotated[Union[int, None], Body()] = None,
):

from typing import Annotated, Union

from fastapi import Depends, FastAPI
from fastapi.security import OAuth2PasswordBearer
from pydantic import BaseModel

app = FastAPI()

oauth2_scheme = OAuth2PasswordBearer(tokenUrl="token")


class User(BaseModel):
    username: str
    email: Union[str, None] = None
    full_name: Union[str, None] = None
    disabled: Union[bool, None] = None


def fake_decode_token(token):

import secrets

from fastapi import Depends, FastAPI, HTTPException, status
from fastapi.security import HTTPBasic, HTTPBasicCredentials

app = FastAPI()

security = HTTPBasic()


def get_current_username(credentials: HTTPBasicCredentials = Depends(security)):
    current_username_bytes = credentials.username.encode("utf8")
    correct_username_bytes = b"stanleyjobson"
    is_correct_username = secrets.compare_digest(

```

/// note | "📡 ℹ"

👆 💪 ⚙️ `from starlette.responses import Response` ⚖️ `from starlette.responses import JSONResponse`.

**FastAPI** 🚚 🎏 `starlette.responses` `fastapi.responses` 🏪 👆, 👩‍💻. ✋️ 🌅 💪 📨 👟 🔗 ⚪️➡️ 💃.

 & `Response` 💪 ⚙️ 🛎 ⚒ 🎚 & 🍪, **FastAPI** 🚚 ⚫️ `fastapi.Response`.

///

## 🛃 🎚

/// tip

🛠️ 🎏 🤝/✔ 🐕‍🦺 💖 🇺🇸🔍, 👱📔, 👱📔, 📂, ♒️. 💪 & 📶 ⏩.

🌅 🏗 ⚠ 🏗 🤝/✔ 🐕‍🦺 💖 👈, ✋️ **FastAPI** 🤝 👆 🧰 ⚫️ 💪, ⏪ 🔨 🏋️ 🏋‍♂ 👆.

///

## **FastAPI** 🚙

FastAPI 🚚 📚 🧰 🔠 👉 💂‍♂ ⚖ `fastapi.security` 🕹 👈 📉 ⚙️ 👉 💂‍♂ 🛠️.

⏭ 📃 👆 🔜 👀 ❔ 🚮 💂‍♂ 👆 🛠️ ⚙️ 📚 🧰 🚚 **FastAPI**.