Currently there isn't enough information logged to figure out what went wrong with an action's handler. We'll need to capture the raw http request and response (headers + body) in our internal error's detail, so that they are logged and sent to the client when requested with admin credentials. Maybe something like this along with our current error message?

{
  "request": {"headers": {}, "body": ".."},
  "response": {"headers": {}, "body": ".." }
}

We'll need to be a little careful about logging headers which are derived from environment variables.