# `Response` class

You can declare a parameter in a *path operation function* or dependency to be of type `Response` and then you can set data for the response like headers or cookies.

You can also use it directly to create an instance of it and return it from your *path operations*.

You can import it directly from `fastapi`:

```python
from fastapi import Response
```

func parseReleaseData(data string) (sha256Sum []byte, releaseTime time.Time, releaseInfo string, err error) {
	defer func() {
		if err != nil {
			err = AdminError{
				Code:       AdminUpdateUnexpectedFailure,
				Message:    err.Error(),
				StatusCode: http.StatusInternalServerError,
			}
		}
	}()

	fields := strings.Fields(data)
	if len(fields) != 2 {

}
```

### Custom OpenAPI *path operation* schema

The dictionary in `openapi_extra` will be deeply merged with the automatically generated OpenAPI schema for the *path operation*.

So, you could add additional data to the automatically generated schema.

                <br>
                <p>
                If you did this intentionally, please accept the change and provide an explanation:
                <a class="btn btn-info" role="button" data-toggle="collapse" href="#accept-${changeId}" aria-expanded="false" aria-controls="collapseExample">Accept this change</a>
                <div class="collapse" id="accept-${changeId}">
                  <div class="well">

	}

	n := lengths[len(lengths)-1]
	a := make([]byte, n+1)
	b := make([]byte, n+1)
	for _, len := range lengths {
		// randomish but deterministic data. No 0 or 255.
		for i := 0; i < len; i++ {
			a[i] = byte(1 + 31*i%254)
			b[i] = byte(1 + 31*i%254)
		}
		// data past the end is different
		for i := len; i <= n; i++ {
			a[i] = 8
			b[i] = 9
		}
		cmp := Compare(a[:len], b[:len])
		if cmp != 0 {

    start_date: datetime


@app.webhooks.post("new-subscription")
def new_subscription(body: Subscription):
    """
    When a new user subscribes to your service we'll send you a POST request with this
    data to the URL that you register for the event `new-subscription` in the dashboard.
    """


@app.get("/users/")
def read_users():

    // https://github.com/google/guava/issues/2996
    // no data, just testing that there's no StackOverflowException
    assertEquals(-1, tenMillionEmptySources().read());
  }

  public void testReadArray_noStackOverflow() throws IOException {
    // https://github.com/google/guava/issues/2996
    // no data, just testing that there's no StackOverflowException

                    "summary": "Create Files",
                    "operationId": "create_files_files__post",
                    "requestBody": {
                        "content": {
                            "multipart/form-data": {
                                "schema": {
                                    "$ref": "#/components/schemas/Body_create_files_files__post"
                                }
                            }

     * so that it may be included in the list of results. IOW we do
     * not want to create a new NbtAddress object for this particular
     * address from which the query is constructed, we want to populate
     * the data of the existing address that should be one of several
     * returned by the node status.
     */

    NodeStatusResponse( NbtAddress queryAddress ) {
        this.queryAddress = queryAddress;

/// tip

Prefer to use the `Annotated` version if possible.

///

```Python hl_lines="9-12  16"
{!> ../../docs_src/cookie_param_models/tutorial001.py!}
```

////

**FastAPI** will **extract** the data for **each field** from the **cookies** received in the request and give you the Pydantic model you defined.

## Check the Docs

You can see the defined cookies in the docs UI at `/docs`:

<div class="screenshot">