Async Client?

This sample code doesn't work in my AWS Lambda:
```js
var client = new AWS.NodeHttpClient();
console.log("client:", client)
// returns "client: {}"

client.handleRequest(req, null, function(httpResp) {
console.log("this never gets called")
}
```

This posts mentions something about an async Client but I'm not sure where to put the `await`?
https://stackoverflow.com/questions/60609426/aws-httpclient-handlerequest-is-not-working-in-aws-lambda