```Python
from typing import Union

from fastapi import FastAPI

app = FastAPI()


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


@app.get("/items/{item_id}")
def read_item(item_id: int, q: Union[str, None] = None):
    return {"item_id": item_id, "q": q}
```

### Dockerfile

同じプロジェクト・ディレクトリに`Dockerfile`というファイルを作成します：

```{ .dockerfile .annotate }
# (1)

    # authenticate user
    return User()


@app.get("/items/")
def read_items(user: User = Depends(get_current_user)):
    ...


@app.post("/items/")
def create_item(*, user: User = Depends(get_current_user), item: Item):
    ...


@app.get("/items/{item_id}")
def read_item(*, user: User = Depends(get_current_user), item_id: int):
    ...

                ```python
                from fastapi import FastAPI

                app = FastAPI(redirect_slashes=True)  # the default

                @app.get("/items/")
                async def read_items():
                    return [{"item_id": "Foo"}]
                ```

                With this app, if a client goes to `/items` (without a trailing slash),

        ## Example

        ```python
        from fastapi import APIRouter, FastAPI

        app = FastAPI()
        router = APIRouter()

        @router.get("/items/")
        def read_items():
            return [{"name": "Empanada"}, {"name": "Arepa"}]

        app.include_router(router)
        ```
        """
        return self.api_route(
            path=path,