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  2. github.com/tiangolo/fastapi

    docs_src/custom_response/tutorial003_py39.py 

    from fastapi import FastAPI
from fastapi.responses import HTMLResponse

app = FastAPI()


@app.get("/items/")
async def read_items():
    html_content = """
    <html>
        <head>
            <title>Some HTML in here</title>
        </head>
        <body>
            <h1>Look ma! HTML!</h1>
        </body>
    </html>
    """
    Created: Sun Dec 28 07:19:09 GMT 2025
    - Last Modified: Wed Dec 17 20:41:43 GMT 2025
    - 394 bytes
    - Click Count (0)
  3. github.com/tiangolo/fastapi

    docs_src/query_params/tutorial006_py39.py 

    from typing import Union

from fastapi import FastAPI

app = FastAPI()


@app.get("/items/{item_id}")
async def read_user_item(
    item_id: str, needy: str, skip: int = 0, limit: Union[int, None] = None
):
    item = {"item_id": item_id, "needy": needy, "skip": skip, "limit": limit}
    Created: Sun Dec 28 07:19:09 GMT 2025
    - Last Modified: Wed Dec 17 20:41:43 GMT 2025
    - 301 bytes
    - Click Count (0)
  4. github.com/tiangolo/fastapi

    fastapi/applications.py 

                        },
                    {
                        "name": "items",
                        "description": "Manage items. So _fancy_ they have their own docs.",
                        "externalDocs": {
                            "description": "Items external docs",
                            "url": "https://fastapi.tiangolo.com/",
                        },
    Created: Sun Dec 28 07:19:09 GMT 2025
    - Last Modified: Wed Dec 17 21:25:59 GMT 2025
    - 176.3K bytes
    - Click Count (0)
  5. github.com/tiangolo/fastapi

    docs_src/header_param_models/tutorial002_py310.py 

        model_config = {"extra": "forbid"}

    host: str
    save_data: bool
    if_modified_since: str | None = None
    traceparent: str | None = None
    x_tag: list[str] = []


@app.get("/items/")
async def read_items(headers: CommonHeaders = Header()):
    Created: Sun Dec 28 07:19:09 GMT 2025
    - Last Modified: Tue Sep 17 18:54:10 GMT 2024
    - 392 bytes
    - Click Count (0)
  6. github.com/tiangolo/fastapi

    docs_src/path_params_numeric_validations/tutorial005_py39.py 

    from fastapi import FastAPI, Path

app = FastAPI()


@app.get("/items/{item_id}")
async def read_items(
    *,
    item_id: int = Path(title="The ID of the item to get", gt=0, le=1000),
    q: str,
):
    results = {"item_id": item_id}
    if q:
        results.update({"q": q})
    Created: Sun Dec 28 07:19:09 GMT 2025
    - Last Modified: Wed Dec 17 20:41:43 GMT 2025
    - 298 bytes
    - Click Count (0)
  7. github.com/tiangolo/fastapi

    docs/zh/docs/tutorial/handling-errors.md 

    {* ../../docs_src/handling_errors/tutorial001.py hl[11] *}

### 响应结果

请求为 `http://example.com/items/foo`（`item_id` 为 `「foo」`）时，客户端会接收到 HTTP 状态码 - 200 及如下 JSON 响应结果：

```JSON
{
  "item": "The Foo Wrestlers"
}

```

但如果客户端请求 `http://example.com/items/bar`（`item_id` `「bar」` 不存在时），则会接收到 HTTP 状态码 - 404（「未找到」错误）及如下 JSON 响应结果：

```JSON
{
  "detail": "Item not found"
}

```
    Created: Sun Dec 28 07:19:09 GMT 2025
    - Last Modified: Sat Oct 11 17:48:49 GMT 2025
    - 8.2K bytes
    - Click Count (0)
  8. github.com/tiangolo/fastapi

    docs_src/body_multiple_params/tutorial005_py310.py 

    from pydantic import BaseModel

app = FastAPI()


class Item(BaseModel):
    name: str
    description: str | None = None
    price: float
    tax: float | None = None


@app.put("/items/{item_id}")
async def update_item(item_id: int, item: Item = Body(embed=True)):
    results = {"item_id": item_id, "item": item}
    Created: Sun Dec 28 07:19:09 GMT 2025
    - Last Modified: Fri May 13 23:38:22 GMT 2022
    - 369 bytes
    - Click Count (0)
  9. github.com/tiangolo/fastapi

    docs_src/body_nested_models/tutorial002_py310.py 

    from pydantic import BaseModel

app = FastAPI()


class Item(BaseModel):
    name: str
    description: str | None = None
    price: float
    tax: float | None = None
    tags: list[str] = []


@app.put("/items/{item_id}")
async def update_item(item_id: int, item: Item):
    results = {"item_id": item_id, "item": item}
    Created: Sun Dec 28 07:19:09 GMT 2025
    - Last Modified: Fri Jan 07 14:11:31 GMT 2022
    - 369 bytes
    - Click Count (0)
  10. github.com/tiangolo/fastapi

    docs_src/body_nested_models/tutorial003_py310.py 

    app = FastAPI()


class Item(BaseModel):
    name: str
    description: str | None = None
    price: float
    tax: float | None = None
    tags: set[str] = set()


@app.put("/items/{item_id}")
async def update_item(item_id: int, item: Item):
    results = {"item_id": item_id, "item": item}
    Created: Sun Dec 28 07:19:09 GMT 2025
    - Last Modified: Fri Jan 07 14:11:31 GMT 2022
    - 371 bytes
    - Click Count (0)
  11. github.com/tiangolo/fastapi

    docs_src/pydantic_v1_in_v2/tutorial004_an_py310.py 

    from pydantic.v1 import BaseModel


class Item(BaseModel):
    name: str
    description: str | None = None
    size: float


app = FastAPI()


@app.post("/items/")
async def create_item(item: Annotated[Item, Body(embed=True)]) -> Item:
    Created: Sun Dec 28 07:19:09 GMT 2025
    - Last Modified: Sat Oct 11 16:45:54 GMT 2025
    - 360 bytes
    - Click Count (0)
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