In your rulebook you are listening on port 8000 but the curl command trys to post to port 5000. curl -X POST -H "Content-Type: application/json" -d @42.json 127.0.0.1:5000/endpoint
In your rulebook you are listening on port 8000 but the curl command trys to post to port 5000.
curl -X POST -H "Content-Type: application/json" -d @42.json 127.0.0.1:5000/endpoint