You also define in some way at which **moments** your app will send those requests or events.

And **your users** define in some way (for example in a web dashboard somewhere) the **URL** where your app should send those requests.

But you can return a `JSONResponse` directly from your *path operations*.

It might be useful, for example, to return custom headers or cookies.

## Return a `Response` { #return-a-response }

In fact, you can return any `Response` or any sub-class of it.

/// tip

`JSONResponse` itself is a sub-class of `Response`.

    allowReserved: Optional[bool] = None


class MediaType(BaseModelWithConfig):
    schema_: Optional[Union[Schema, Reference]] = Field(default=None, alias="schema")
    example: Optional[Any] = None
    examples: Optional[dict[str, Union[Example, Reference]]] = None
    encoding: Optional[dict[str, Encoding]] = None


class ParameterBase(BaseModelWithConfig):
    description: Optional[str] = None

        json={
            "username": "foo",
            "password": "fighter",
            "email": "foo@example.com",
            "full_name": "Grave Dohl",
        },
    )
    assert response.status_code == 200, response.text
    assert response.json() == {
        "username": "foo",
        "email": "foo@example.com",
        "full_name": "Grave Dohl",
    }


def test_openapi_schema(client: TestClient):

This includes, for example:

* Email notifications sent after performing an action:
    * As connecting to an email server and sending an email tends to be "slow" (several seconds), you can return the response right away and send the email notification in the background.
* Processing data:

---

Ejemplos comunes de operaciones limitadas por la CPU son cosas que requieren procesamiento matemático complejo.

Por ejemplo:

* **Procesamiento de audio** o **imágenes**.

That's why in this example we have to declare it in the `response_model` parameter.

...but continue reading below to see how to overcome that.

## Return Type and Data Filtering { #return-type-and-data-filtering }

                                "examples": {
                                    "normal": {
                                        "summary": "A normal example",
                                        "description": "A **normal** item works correctly.",
                                        "value": {
                                            "name": "Foo",

            "info": {"title": "FastAPI", "version": "0.1.0"},
            "servers": [
                {
                    "url": "https://stag.example.com",
                    "description": "Staging environment",
                },
                {
                    "url": "https://prod.example.com",
                    "description": "Production environment",
                },
            ],
            "paths": {

  <modelVersion>4.0.0</modelVersion>

  <parent>
    <groupId>com.example.group</groupId>
    <artifactId>com-parent</artifactId>
    <version>LATEST</version>
  </parent>
  <groupId>com.example.group</groupId>
  <artifactId>valid-version-wrong</artifactId>
  <version>1.0</version>

  <description>