Resources

@Serializable
@Resource("/users")
data class Users {
  @Serializable
  @Resource("/{id}")
  data class ById(val parent: Users = Users(), val id: Long)

  @Serializable
  @Resource("/add")
  data class Add(val parent: Users = Users(), val name: String)
}

routing {
  get<Users.ById> { userById ->
    val userId: Long = userById.id
  }
  post<Users.Add> { addUser ->
    val userName: String = addUser.name
  }
}

// client-side
val newUserId = client.post(Users.Add("new_user"))
val addedUser = client.get(Users.ById(newUserId))