mvn test
curl -X POST localhost:9999/api/clients -H 'content-type: application/json' -d '{"firstname": "Mateusz", "lastname": "Bernacik", "address": {"street": "rakowicka"}}'
curl -X POST localhost:9999/api/clients -H 'content-type: application/json' -d '{"firstname": "Mateusz", "lastname": "Bernacik", "address": {"street": "rakowicka"}}'
curl -X POST localhost:9999/api/clients -H 'content-type: application/json' -d '{"firstname": "Mateusz", "lastname": "Bernacik", "address": {"street": "rakowicka"}}'
curl localhost:9999/api/clients | jq
curl localhost:9999/api/clients | python -m json.tool