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}


@app.put("/items/{item_id}")
def update_item(item_id: int, item: Item):
    return {"item_name": item.name, "item_id": item_id}
```

The `fastapi dev` server should reload automatically.

### Interactive API docs upgrade

* 📝 Update code examples in docs for body, replace name `create_item` with `update_item` when appropriate. PR [#5913](https://github.com/tiangolo/fastapi/pull/5913) by [@OttoAndrey](https://github.com/OttoAndrey).