from fastapi.security import OAuth2AuthorizationCodeBearer
from fastapi.testclient import TestClient

app = FastAPI()

oauth2_scheme = OAuth2AuthorizationCodeBearer(
    authorizationUrl="authorize", tokenUrl="token", auto_error=True
)


@app.get("/items/")
async def read_items(token: Optional[str] = Security(oauth2_scheme)):
    return {"token": token}


client = TestClient(app)


def test_no_token():

from fastapi.security import OAuth2AuthorizationCodeBearer
from fastapi.testclient import TestClient

app = FastAPI()

oauth2_scheme = OAuth2AuthorizationCodeBearer(
    authorizationUrl="authorize",
    tokenUrl="token",
    description="OAuth2 Code Bearer",
    auto_error=True,
)


@app.get("/items/")
async def read_items(token: Optional[str] = Security(oauth2_scheme)):
    return {"token": token}

from typing import Optional

from fastapi import FastAPI, Security
from fastapi.security import OAuth2PasswordBearer
from fastapi.testclient import TestClient

app = FastAPI()

oauth2_scheme = OAuth2PasswordBearer(tokenUrl="/token", auto_error=False)


@app.get("/items/")
async def read_items(token: Optional[str] = Security(oauth2_scheme)):
    if token is None:
        return {"msg": "Create an account first"}
    return {"token": token}

        final String tokenUrl = getParameter(TOKEN_URL);
        final String tokenPattern = getParameter(TOKEN_PATTERN);
        final List<Pair<String, String>> responseParams = new ArrayList<>();
        final String encoding = getParameter(ENCODING);
        if (StringUtil.isNotBlank(tokenUrl) && StringUtil.isNotBlank(tokenPattern)) {

from typing import Optional

from fastapi import FastAPI, Security
from fastapi.security import OAuth2PasswordBearer
from fastapi.testclient import TestClient

app = FastAPI()

oauth2_scheme = OAuth2PasswordBearer(
    tokenUrl="/token",
    description="OAuth2PasswordBearer security scheme",
    auto_error=False,
)


@app.get("/items/")
async def read_items(token: Optional[str] = Security(oauth2_scheme)):
    if token is None:

Вскоре мы создадим и саму операцию пути.

!!! info "Дополнительная информация"
    Если вы очень строгий "питонист", то вам может не понравиться стиль названия параметра `tokenUrl` вместо `token_url`.

Wir werden demnächst auch die eigentliche Pfadoperation erstellen.

!!! info
    Wenn Sie ein sehr strenger „Pythonista“ sind, missfällt Ihnen möglicherweise die Schreibweise des Parameternamens `tokenUrl` anstelle von `token_url`.

    本例中，**FastAPI** 还提供了构建工具。

创建 `OAuth2PasswordBearer` 的类实例时，要传递 `tokenUrl` 参数。该参数包含客户端（用户浏览器中运行的前端） 的 URL，用于发送 `username` 与 `password`，并获取令牌。

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

!!! tip "提示"

    在此，`tokenUrl="token"` 指向的是暂未创建的相对 URL `token`。这个相对 URL 相当于 `./token`。

    👈 💼, **FastAPI** 🚚 👆 ⏮️ 🧰 🏗 ⚫️.

🕐❔ 👥 ✍ 👐 `OAuth2PasswordBearer` 🎓 👥 🚶‍♀️ `tokenUrl` 🔢. 👉 🔢 🔌 📛 👈 👩‍💻 (🕸 🏃 👩‍💻 🖥) 🔜 ⚙️ 📨 `username` & `password` ✔ 🤚 🤝.

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

!!! tip
    📥 `tokenUrl="token"` 🔗 ⚖ 📛 `token` 👈 👥 🚫 ✍. ⚫️ ⚖ 📛, ⚫️ 🌓 `./token`.

Quando nós criamos uma instância da classe `OAuth2PasswordBearer`, nós passamos pelo parâmetro `tokenUrl` Esse parâmetro contém a URL que o client (o frontend rodando no browser do usuário) vai usar para mandar o `username` e `senha` para obter um token.

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

!!! tip "Dica"