responses={404: {"description": "Not found"}},
)


fake_items_db = {"plumbus": {"name": "Plumbus"}, "gun": {"name": "Portal Gun"}}


@router.get("/")
async def read_items():
    return fake_items_db


@router.get("/{item_id}")
async def read_item(item_id: str):
    if item_id not in fake_items_db:
        raise HTTPException(status_code=404, detail="Item not found")

    id: str
    value: str


class Message(BaseModel):
    message: str


app = FastAPI()


@app.get(
    "/items/{item_id}",
    response_model=Item,
    responses={
        404: {"model": Message, "description": "The item was not found"},
        200: {
            "description": "Item requested by ID",
            "content": {
                "application/json": {

class Message(BaseModel):
    message: str


app = FastAPI()


@app.get("/items/{item_id}", response_model=Item, responses={404: {"model": Message}})
async def read_item(item_id: str):
    if item_id == "foo":
        return {"id": "foo", "value": "there goes my hero"}

        int statusCode = response.getStatusCode();
        // Accept 404 or 200 with error (depending on implementation)
        assertTrue(statusCode == 200 || statusCode == 404 || statusCode == 500,
                "Status code should be 200, 404 or 500, but was " + statusCode);
    }

    @Test
    void testDelete_notFound() {

它接收一个 `dict`：键是每个响应的状态码（例如 `200`），值是包含该响应信息的另一个 `dict`。

这些响应的每个 `dict` 都可以有一个键 `model`，包含一个 Pydantic 模型，就像 `response_model` 一样。

**FastAPI** 会获取该模型，生成它的 JSON Schema，并将其放在 OpenAPI 中的正确位置。

例如，要声明另一个状态码为 `404` 且具有 Pydantic 模型 `Message` 的响应，你可以这样写：

{* ../../docs_src/additional_responses/tutorial001_py310.py hl[18,22] *}

/// note | 注意

记住你需要直接返回 `JSONResponse`。

///

/// info | 信息

        raise InternalError(
            f"The portal gun is too dangerous to be owned by {username}"
        )
    if item_id != "plumbus":
        raise HTTPException(
            status_code=404, detail="Item not found, there's only a plumbus here"
        )

        raise InternalError(
            f"The portal gun is too dangerous to be owned by {username}"
        )
    if item_id != "plumbus":
        raise HTTPException(
            status_code=404, detail="Item not found, there's only a plumbus here"
        )

        raise InternalError(
            f"The portal gun is too dangerous to be owned by {username}"
        )
    if item_id != "plumbus":
        raise HTTPException(
            status_code=404, detail="Item not found, there's only a plumbus here"
        )

        raise InternalError(
            f"The portal gun is too dangerous to be owned by {username}"
        )
    if item_id != "plumbus":
        raise HTTPException(
            status_code=404, detail="Item not found, there's only a plumbus here"
        )

@app.get("/items/{item_id}")
def get_item(item_id: str, username: str = Depends(get_username)):
    if item_id not in data:
        raise HTTPException(status_code=404, detail="Item not found")
    item = data[item_id]
    if item["owner"] != username:
        raise OwnerError(username)