Not seeing the referrer in the documented event structure, and I haven't seen anything in the object in my test lambda - but that's not necessarily an accurate representation of a live request.
Is there a way to determine the referrer in the request inside a lambda@edge. Specifically, I'm working within the ClientRequest.
As per the AWS docs here, CloudFront removes the Referer header. If you wish to forward your Referer header you can whitelist it in the Cache Behaviour settings here: