"info": {
            "title": "ChimichangApp",
            "summary": "Deadpool's favorite app. Nuff said.",
            "description": "\nChimichangApp API helps you do awesome stuff. 🚀\n\n## Items\n\nYou can **read items**.\n\n## Users\n\nYou will be able to:\n\n* **Create users** (_not implemented_).\n* **Read users** (_not implemented_).\n",
            "termsOfService": "http://example.com/terms/",
            "contact": {

    name: Optional[str] = None


class ExtendedItem(Item):
    age: int


@app.post("/items/")
def save_union_different_body(item: Union[ExtendedItem, Item]):
    return {"item": item}


client = TestClient(app)


def test_post_extended_item():
    response = client.post("/items/", json={"name": "Foo", "age": 5})
    assert response.status_code == 200, response.text

                                "application/json": {
                                    "schema": {
                                        "items": {"$ref": "#/components/schemas/Item"},
                                        "type": "array",
                                        "title": "Response Read Items Items  Get",
                                    }
                                }
                            },
                        }

```

////

本例中，访问：

```
http://127.0.0.1:8000/items/foo?short=1
```

或

```
http://127.0.0.1:8000/items/foo?short=True
```

或

```
http://127.0.0.1:8000/items/foo?short=true
```

或

```
http://127.0.0.1:8000/items/foo?short=on
```

或

```
http://127.0.0.1:8000/items/foo?short=yes
```

from fastapi.responses import JSONResponse

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,
):
    if item_id in items:
        item = items[item_id]
        item["name"] = name

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,
):
    if item_id in items:
        item = items[item_id]
        item["name"] = name

        self.q = q
        self.skip = skip
        self.limit = limit


@app.get("/items/")
async def read_items(commons: Annotated[Any, Depends(CommonQueryParams)]):
    response = {}
    if commons.q:
        response.update({"q": commons.q})
    items = fake_items_db[commons.skip : commons.skip + commons.limit]
    response.update({"items": items})

)
async def read_item_name(item_id: str):
    return items[item_id]


@app.get("/items/{item_id}/public", response_model=Item, response_model_exclude={"tax"})
async def read_item_public_data(item_id: str):

client = TestClient(app)


def test_read_item_name():
    response = client.get("/items/bar/name")
    assert response.status_code == 200, response.text
    assert response.json() == {"name": "Bar", "description": "The Bar fighters"}


def test_read_item_public_data():
    response = client.get("/items/bar/public")
    assert response.status_code == 200, response.text
    assert response.json() == {

client = TestClient(app)


def test_read_item_name():
    response = client.get("/items/bar/name")
    assert response.status_code == 200, response.text
    assert response.json() == {"name": "Bar", "description": "The Bar fighters"}


def test_read_item_public_data():
    response = client.get("/items/bar/public")
    assert response.status_code == 200, response.text
    assert response.json() == {