"input": "foo",
                    "ctx": {"expected": "'alexnet', 'resnet' or 'lenet'"},
                }
            ]
        }
    ) | IsDict(
        # TODO: remove when deprecating Pydantic v1
        {
            "detail": [
                {
                    "ctx": {"enum_values": ["alexnet", "resnet", "lenet"]},
                    "loc": ["path", "model_name"],

                "Item": {
                    "title": "Item",
                    "required": IsOneOf(
                        ["name", "description", "price", "tax"],
                        # TODO: remove when deprecating Pydantic v1
                        ["name", "price"],
                    ),
                    "type": "object",
                    "properties": {

                                        ],
                                    }
                                )
                                | IsDict(
                                    # TODO: remove when deprecating Pydantic v1
                                    {
                                        "title": "Square",
                                        "maxItems": 2,

But in most of the cases where we need to do something like this, we want the model just to **filter/remove** some of the data as in this example.

from fastapi.testclient import TestClient

from docs_src.background_tasks.tutorial002 import app

client = TestClient(app)


def test():
    log = Path("log.txt")
    if log.is_file():
        os.remove(log)  # pragma: no cover
    response = client.post("/send-notification/******@****.***?q=some-query")
    assert response.status_code == 200, response.text
    assert response.json() == {"message": "Message sent"}

We could download the OpenAPI JSON to a file `openapi.json` and then we could **remove that prefixed tag** with a script like this:

=== "Python"

    ```Python
    {!> ../../../docs_src/generate_clients/tutorial004.py!}
    ```

=== "Node.js"

    ```Javascript

                    "loc": ["body", "files"],
                    "msg": "Field required",
                    "input": None,
                }
            ]
        }
    ) | IsDict(
        # TODO: remove when deprecating Pydantic v1
        {
            "detail": [
                {
                    "loc": ["body", "files"],
                    "msg": "field required",

## OpenAPI Custom URL

To customize the OpenAPI URL (or remove it), read the docs for [Tutorial - Metadata and Docs URLs](../tutorial/metadata.md#openapi-url){.internal-link target=_blank}.

## OpenAPI Docs URLs

                                    "title": "User-Agent",
                                }
                            )
                            | IsDict(
                                # TODO: remove when deprecating Pydantic v1
                                {"title": "User-Agent", "type": "string"}
                            ),
                            "name": "user-agent",
                            "in": "header",

                    "loc": ["query", "needy"],
                    "msg": "Field required",
                    "input": None,
                }
            ]
        }
    ) | IsDict(
        # TODO: remove when deprecating Pydantic v1
        {
            "detail": [
                {
                    "loc": ["query", "needy"],
                    "msg": "field required",