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# NSExtensionRequestHandling

The interface an app extension uses to respond to a request from a host app.

```
protocol NSExtensionRequestHandling : NSObjectProtocol
```

## Overview

The [`NSExtensionRequestHandling`](/documentation/Foundation/NSExtensionRequestHandling) protocol provides a life cycle hook into an app extension. An extension’s principal object can implement this protocol and use [`beginRequest(with:)`](/documentation/Foundation/NSExtensionRequestHandling/beginRequest(with:)) to keep track of the request from a host app.

## Topics

### Preparing for a request

[`beginRequest(with:)`](/documentation/Foundation/NSExtensionRequestHandling/beginRequest(with:))

Tells the extension to prepare for a host app’s request.


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