> **Experimental**
>
> `@aws-cdk/aws-route53resolver-alpha` is an [**experimental**](/stability) (alpha) package: its API may change in any release, without a major version bump.
# DomainsConfig

Domains configuration.

- Stability: [Experimental](/cdk/api/stability.html)
- Source: [`lib/firewall-domain-list.ts`](https://github.com/aws/aws-cdk/blob/v2.275.0-alpha.0/packages/@aws-cdk/aws-route53resolver-alpha/lib/firewall-domain-list.ts#L129)

## Example

```ts
// The code below shows an example of how to instantiate this type.
// The values are placeholders you should change.
import * as route53resolver_alpha from '@aws-cdk/aws-route53resolver-alpha';
const domainsConfig: route53resolver_alpha.DomainsConfig = {
  domainFileUrl: 'domainFileUrl',
  domains: ['domains'],
};
```

## Properties

- `domainFileUrl`: string — The fully qualified URL or URI of the file stored in Amazon S3 that contains the list of domains to import.

  **Default:** use `domains`

  The file must be a text file and must contain
  a single domain per line. The content type of the S3 object must be `plain/text`.

- `domains`: string[] — A list of domains.

  **Default:** use `domainFileUrl`