# x-operation extension

`x-operation` enables you to specify a URL and HTTP method for an operation that is not described in the Arazzo `sourceDescriptions` section.
The primary application of the `x-operation` extension is to facilitate calls to third-party APIs or other endpoints that are needed in a sequence of API calls.

## Location

Use `x-operation` as part of a [Step object](https://spec.openapis.org/arazzo/v1.0.0.html#step-object).

## x-operation Object

| Field Name  | Type  | Description |
|  --- | --- | --- |
| url | `string` | **REQUIRED.** A valid url including the protocol (such as `http://localhost:4000/my-api` or `https://example.com/api/my-api`). |
| method | `string` | **REQUIRED.** HTTP operation method. Possible values: `GET`, `POST`, `PUT`, `PATCH`, `DELETE`, `HEAD`, `OPTIONS`, `CONNECT`, `TRACE`. You can also use their lowercase equivalents. |


## Example

Make an HTTP request not described in an OpenAPI description as part of a workflow.


```yaml
steps:
  - stepId: get-first-post
    x-operation:
      url: https://jsonplaceholder.typicode.com/posts/1
      method: GET
    successCriteria:
      - condition: $statusCode == 200
```

The `successCriteria` fields work in the same way as other operation types.

## Resources

- [x-security](/docs/respect/extensions/x-security) extension lets you apply OpenAPI security schemes to a step request.
- [Respect commands list](/docs/respect/commands).
- Learn about [Arazzo](/learn/arazzo/what-is-arazzo).