# Warning Header

This header is returned if there are warnings, such as the use of a deprecated version of the API.

## Header Field Name and Values

**Field name:** `Warning`

**Field Values:** `warningCode warningMessage` For warnings about deprecated API versions, the `warningCode` is `299`.

## Example

```nolang
Warning: 299 - "This API is deprecated and will be removed by Summer '22. Please see https://help.salesforce.com/articleView?id=000351312 for details." 
```