class Config:
        extra = "forbid"

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


@app.get("/items/")
async def read_items(headers: Annotated[CommonHeaders, Header()]):

class FilterParams(BaseModel):
    limit: int = Field(100, gt=0, le=100)
    offset: int = Field(0, ge=0)
    order_by: Literal["created_at", "updated_at"] = "created_at"
    tags: list[str] = []


@app.get("/items/")
async def read_items(filter_query: FilterParams = Query()):

message CertificateSigningRequestList {
  // +optional
  optional k8s.io.apimachinery.pkg.apis.meta.v1.ListMeta metadata = 1;

  // items is a collection of CertificateSigningRequest objects
  repeated CertificateSigningRequest items = 2;
}

// CertificateSigningRequestSpec contains the certificate request.
message CertificateSigningRequestSpec {

    limit: int = Field(100, gt=0, le=100)
    offset: int = Field(0, ge=0)
    order_by: Literal["created_at", "updated_at"] = "created_at"
    tags: list[str] = []


@app.get("/items/")
async def read_items(filter_query: Annotated[FilterParams, Query()]):

        extra = "forbid"

    limit: int = Field(100, gt=0, le=100)
    offset: int = Field(0, ge=0)
    order_by: Literal["created_at", "updated_at"] = "created_at"
    tags: list[str] = []


@app.get("/items/")
async def read_items(filter_query: FilterParams = Query()):

* `externalDocs`: `dict` 🔬 🔢 🧾 ⏮️:
    * `description`: `str` ⏮️ 📏 📛 🔢 🩺.
    * `url` (**✔**): `str` ⏮️ 📛 🔢 🧾.

### ✍ 🗃 🔖

➡️ 🔄 👈 🖼 ⏮️ 🔖 `users` & `items`.

✍ 🗃 👆 🔖 & 🚶‍♀️ ⚫️ `openapi_tags` 🔢:

```Python hl_lines="3-16  18"
{!../../docs_src/metadata/tutorial004.py!}
```

👀 👈 👆 💪 ⚙️ ✍ 🔘 📛, 🖼 "💳" 🔜 🎦 🦁 (**💳**) & "🎀" 🔜 🎦 ❕ (_🎀_).

                    "properties": {
                        "loc": {
                            "title": "Location",
                            "type": "array",
                            "items": {
                                "anyOf": [{"type": "string"}, {"type": "integer"}]
                            },
                        },
                        "msg": {"title": "Message", "type": "string"},

                        "properties": {
                            "detail": {
                                "title": "Detail",
                                "type": "array",
                                "items": {
                                    "$ref": "#/components/schemas/ValidationError"
                                },
                            }
                        },
                    },

  // +optional
  optional k8s.io.apimachinery.pkg.apis.meta.v1.ListMeta metadata = 1;

  // items is a list of schema objects.
  repeated RuntimeClass items = 2;
}

// Scheduling specifies the scheduling constraints for nodes supporting a
// RuntimeClass.
message Scheduling {

## Example

```python
from fastapi import FastAPI, status

app = FastAPI()


@app.get("/items/", status_code=status.HTTP_418_IM_A_TEAPOT)
def read_items():
    return [{"name": "Plumbus"}, {"name": "Portal Gun"}]
```