-- |
--
-- Since 3.0.3
module Network.Wai.Middleware.AddHeaders (
    addHeaders,
) where

import Control.Arrow (first)
import Data.ByteString (ByteString)
import qualified Data.CaseInsensitive as CI
import Network.HTTP.Types (Header)
import Network.Wai (Middleware, mapResponseHeaders, modifyResponse)
import Network.Wai.Internal (Response (..))

addHeaders :: [(ByteString, ByteString)] -> Middleware
-- ^ Prepend a list of headers without any checks
--
-- Since 3.0.3
addHeaders h = modifyResponse $ addHeaders' (map (first CI.mk) h)

addHeaders' :: [Header] -> Response -> Response
addHeaders' h = mapResponseHeaders (h ++)