`body` parameter is absent in AWS Lambda Authorizer `event` object

In custom authorizer request type there is no body in the passed event to the authorizer. According to the documentation:

For a custom authorizer of the REQUEST type, API Gateway passes the required request parameters to the authorizer Lambda function as part of the event object. The affected request parameters include headers, path parameters, query string parameters, stage variables, and some of request context variables.

NO Body is there!