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# Set Up Event Handlers

The fetch actions sent to a connector are asynchronous. Asynchronous actions do not run immediately, but are added to a queue. This means that the person or application that sends the action does not receive an immediate response. However, you can configure the connector to call an event handler when an asynchronous action starts, finishes, or encounters an error.

You can use an event handler to:

- return data about an event back to the application that sent the action.
- write event data to a text file, to log any errors that occur.

The connector can call an event handler for the following events:

OnStart | The `OnStart` event is called when the connector starts processing an asynchronous action.
OnFinish | The `OnFinish` event is called when the connector successfully finishes processing an asynchronous action.
OnError | The `OnError` event is called when an asynchronous action fails and cannot continue.

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