Elm:
디렉토리 존재 여부 확인하기

-- Elm에서 HTTP 요청 보내기 (예시)
import Http
import Json.Decode as Decode

type alias DirectoryExistsResponse =
    { exists : Bool }

directoryExistsDecoder : Decode.Decoder DirectoryExistsResponse
directoryExistsDecoder =
    Decode.map DirectoryExistsResponse
        (Decode.field "exists" Decode.bool)

checkDirectory : String -> Cmd Msg
checkDirectory directoryPath =
    Http.get
        { url = "서버 URL/check-directory?path=" ++ directoryPath
        , decoder = directoryExistsDecoder
        }
        |> Http.send DirectoryExistsResult

-- 결과 처리하기
type Msg
    = DirectoryExistsResult (Result Http.Error DirectoryExistsResponse)

update : Msg -> Model -> (Model, Cmd Msg)
update msg model =
    case msg of
        DirectoryExistsResult (Ok res) ->
            -- res.exists 값을 사용하여 필요한 로직 적용
            ...

        DirectoryExistsResult (Err _) ->
            -- 에러 핸들링하기
            ...