When a 202 is returned, an AcceptedError is returned by client.Do and the resp.Body is closed. The body is never read or decoded into the result parameter, so there is no way to inspect the body. However, I am beta testing an experimental endpoint that returns URLs you need to check the status of your request so I need access to the body.
I am not sure if any existing endpoints return a body in 202s, but some will in the future so it would be nice if we could access the body.