router_b_a = APIRouter()
router_b_a_c_override = APIRouter()  # Overrides default class again


@app.get("/")
def get_root():
    return {"msg": "Hello World"}


@app.get("/override", response_class=PlainTextResponse)
def get_path_override():
    return "Hello World"


@router_a.get("/")
def get_a():
    return {"msg": "Hello A"}


@router_a.get("/override", response_class=PlainTextResponse)

If you run it and go to [http://localhost:8000/v1/](http://localhost:8000/v1/) you will see the response from Flask:

```txt
Hello, World from Flask!
```

And if you go to [http://localhost:8000/v2](http://localhost:8000/v2) you will see the response from FastAPI:

```JSON
{
    "message": "Hello World"
}

其餘則由 **FastAPI** 處理。

如果你啟動它並前往 [http://localhost:8000/v1/](http://localhost:8000/v1/)，你會看到來自 Flask 的回應：

```txt
Hello, World from Flask!
```

如果你前往 [http://localhost:8000/v2](http://localhost:8000/v2)，你會看到來自 FastAPI 的回應：

```JSON
{
    "message": "Hello World"
}

    return {key: "Hello World", 1: 1}


client = TestClient(app)


def test_orjson_non_str_keys():
    with warnings.catch_warnings():
        warnings.simplefilter("ignore", FastAPIDeprecationWarning)
        with client:
            response = client.get("/orjson_non_str_keys")

- Controller-manager: the following flags have no effect and would be removed in v1.24:
  - `--port`
  - `--address`
  The insecure port flags `--port` may only be set to 0 now.
- Kube-scheduler: the `--port` and `--address` flags have no effect and would be removed in v1.24.
  The insecure port flags `--port` may only be set to 0 now.

    return new WeakReference<>(shadowLoader);
  }

  /*
   * TODO(cpovirk): It would be great to run all these tests (including class unloading) in an
   * environment that forces Futures.getChecked to its fallback WeakSetValidator. One awful way of
   * doing so would be to derive a separate test library by using remove_from_jar to strip out
   * ClassValueValidator.
   *

 *   <li>Max children per node: ~71% (1.5k / 2k)
 * </ul>
 *
 * <p>If any of these limits are exceeded, the definitive solution is to increase the node size from
 * 3 to 4 characters. This would allow:
 *
 * <ul>
 *   <li>A full 32-bit offset for the String Pool (using 2 characters).
 *   <li>A full 16-bit child count (using the freed bits from the 4th character).
 * </ul>
 */
@GwtCompatible

    return new WeakReference<>(shadowLoader);
  }

  /*
   * TODO(cpovirk): It would be great to run all these tests (including class unloading) in an
   * environment that forces Futures.getChecked to its fallback WeakSetValidator. One awful way of
   * doing so would be to derive a separate test library by using remove_from_jar to strip out
   * ClassValueValidator.
   *

            """
        ),
    ] = None,
) -> HTMLResponse:
    """
    Generate and return the HTML  that loads Swagger UI for the interactive
    API docs (normally served at `/docs`).

    You would only call this function yourself if you needed to override some parts,
    for example the URLs to use to load Swagger UI's JavaScript and CSS.

    Read more about it in the

Если вы запустите это и перейдёте по [http://localhost:8000/v1/](http://localhost:8000/v1/), вы увидите HTTP‑ответ от Flask:

```txt
Hello, World from Flask!
```

А если вы перейдёте по [http://localhost:8000/v2](http://localhost:8000/v2), вы увидите HTTP‑ответ от FastAPI:

```JSON
{
    "message": "Hello World"
}