package servant-multipart: multipart/form-data (e.g file upload) support for servant $ cabal install servant-multipart Resolving dependencies... Notice: installing into a sandbox located at foo/.cabal-sandbox Downloading http-client-0.5.6.…

Applicativeスタイルで.*?で任意項目、.!=でデフォルト値を設定します。` parseJSON (Object m) = AppConfig <$> m .:? "port" .!= 8081 -- default a sample of reading a yaml file by Haskell