> ## Documentation Index
> Fetch the complete documentation index at: https://docs.domino.ai/llms.txt
> Use this file to discover all available pages before exploring further.

# Allow external resources in Apps

If your Domino instance enforces iFrame restrictions or a content security policy (CSP), some external content may be blocked. In these cases, your administrator must allowlist specific resources before your App can access them.

## When allowlisting is required

Apps may be blocked from loading content - such as fonts, APIs, or embedded pages - unless those URLs are explicitly allowlisted. Contact your Domino admin to get the URL added to the allowlist.

### Identify blocked resources

To find out which external resources your App is being prevented from loading, check your browser’s developer console while the App is running.

1. Open your App in Domino and run it.

2. Once it’s running, open your browser’s web console. For example, in Chrome, use `Cmd+Option+J` or `Ctrl+Shift+J`.

3. Look for errors in red, such as:

   ```shell theme={null}
   Refused to connect to https://example.com because it violates the Content Security Policy.
   ```

4. Copy the URLs of any blocked resources your App depends on.

### Request access

After you identify the blocked URLs, request that your administrator allowlist them so your App can load properly.

1. Send the list of URLs to your Domino administrator and request that they be allowlisted.

2. After the allowlist is updated, stop and restart your App.

3. Once restarted, the App should be able to load the required external resources.

## Next steps

* [Publish and Share Apps](/cloud/platform-capabilities/features/apps/publish-an-app): Publish apps, customize URLs, and share with authorized users.

* [Use Best Practices for Apps](/cloud/platform-capabilities/features/apps/best-practices-for-apps): Apply best practices to make apps easier to find and maintain.


## Related topics

- [App security and identity](/cloud/platform-capabilities/features/apps/authentication-and-identity/app-security.md)
- [App Structure and Lifecycle](/cloud/platform-capabilities/features/apps/apps-in-domino/app-structure-lifecycle.md)
- [Apps in Domino](/cloud/platform-capabilities/features/apps/apps-in-domino/index.md)
- [Understand App usage](/cloud/platform-capabilities/features/apps/app-logs-and-versioning/understanding-app-usage.md)