您可以向路径操作装饰器传递参数 `responses` 。

它接收一个 `dict`，键是每个响应的状态代码（如`200`），值是包含每个响应信息的其他 `dict`。

每个响应字典都可以有一个关键模型，其中包含一个 `Pydantic` 模型，就像 `response_model` 一样。

**FastAPI**将采用该模型，生成其`JSON Schema`并将其包含在`OpenAPI`中的正确位置。

例如，要声明另一个具有状态码 `404` 和`Pydantic`模型 `Message` 的响应，可以写：
{* ../../docs_src/additional_responses/tutorial001.py hl[18,22] *}

/// note

请记住，您必须直接返回 `JSONResponse` 。

///

/// info

`model` 密钥不是OpenAPI的一部分。

**FastAPI** возьмёт эту модель, сгенерирует для неё JSON‑схему и включит её в нужное место в OpenAPI.

Например, чтобы объявить ещё один ответ со статус-кодом `404` и Pydantic-моделью `Message`, можно написать:

{* ../../docs_src/additional_responses/tutorial001_py39.py hl[18,22] *}

/// note | Примечание

Имейте в виду, что необходимо возвращать `JSONResponse` напрямую.

///

    if not hero:
        raise HTTPException(status_code=404, detail="Hero not found")
    return hero


@app.patch("/heroes/{hero_id}", response_model=HeroPublic)
def update_hero(hero_id: int, hero: HeroUpdate, session: SessionDep):
    hero_db = session.get(Hero, hero_id)
    if not hero_db:
        raise HTTPException(status_code=404, detail="Hero not found")
    hero_data = hero.model_dump(exclude_unset=True)

                          example: "text/html"
        '400':
          $ref: '#/components/responses/BadRequest'
        '401':
          $ref: '#/components/responses/Unauthorized'
        '404':
          $ref: '#/components/responses/NotFound'
        '500':
          $ref: '#/components/responses/InternalServerError'

  /documents/all:
    get:
      tags:
        - search

        responseData.setHttpStatusCode(404);
        responseData.setUrl("http://example.com/");
        responseData.setMimeType("text/plain");
        return responseData;
    }

    private ResponseData getTestData4() {
        final ResponseData responseData = new ResponseData();
        responseData.setHttpStatusCode(404);
        responseData.setUrl("https://example.com/");

app = FastAPI()

items = {"foo": "The Foo Wrestlers"}


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

app = FastAPI()

items = {"foo": "The Foo Wrestlers"}


@app.get("/items-header/{item_id}")
async def read_item_header(item_id: str):
    if item_id not in items:
        raise HTTPException(
            status_code=404,
            detail="Item not found",
            headers={"X-Error": "There goes my error"},
        )

        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"
        )

from fastapi import FastAPI
from fastapi.responses import FileResponse
from pydantic import BaseModel


class Item(BaseModel):
    id: str
    value: str


responses = {
    404: {"description": "Item not found"},
    302: {"description": "The item was moved"},
    403: {"description": "Not enough privileges"},
}


app = FastAPI()


@app.get(
    "/items/{item_id}",
    response_model=Item,

        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"
        )