curl -X POST http://localhost:4000/api/push -H "Content-Type: application/json" -d '{"sender": "raphael", "message": "Hello"}'
# curl -X POST http://localhost:4000/api/peak -H "Content-Type: application/json" -d '{"sender": "raphael"}'
# curl -X POST http://localhost:4000/api/pop -H "Content-Type: application/json" -d '{"sender": "raphael"}'
# curl -X POST http://localhost:4000/api/list -H "Content-Type: application/json" -d '{"sender": "raphael", "minutes": "40"}'
# curl -X POST http://localhost:4000/api/clear -H "Content-Type: application/json" -d '{"sender": "raphael"}'