import lyng.io.http.server

closed class CreateUserRequest(name: String, age: Int)
closed class CreateUserResponse(id: Int, name: String, age: Int)

val server = HttpServer()

server.postPath("/api/users") {
    val req = jsonBody<CreateUserRequest>()

    if (req.name.isBlank()) {
        respondJson({ error: "name must not be empty" }, 400)
        return
    }

    respondJson(CreateUserResponse(101, req.name, req.age), 201)
}

server.listen(8080, "127.0.0.1")