Execute sbt run and in a new terminal window:
$ curl http://127.0.0.1:8081/users
[]
$ curl -H "Content-Type: application/json" -X POST -d '{"name":"John"}' http://127.0.0.1:8081/users
OK
$ curl http://127.0.0.1:8081/users
[{"name":"John"}]
$ curl -H "Content-Type: application/json" -X POST -d '{"name":"John"}' http://127.0.0.1:8081/users
The request could not be processed because of conflict in the request, such as an edit conflict.
$ curl http://127.0.0.1:8081/users
[{"name":"John"}]
$ curl -H "Content-Type: application/json" -X POST -d '{"name":"Marc"}' http://127.0.0.1:8081/users
OK
$ curl http://127.0.0.1:8081/users
[{"name":"John"},{"name":"Marc"}]