Cookies are added to the CookieJar for all intermediate/redirected requests.

servant-client/src/Servant/Client/Internal/HttpClient.hs

@@ -23,6 +23,8 @@ import           Control.Monad.Catch
                  (MonadCatch, MonadThrow)
 import           Control.Monad.Error.Class
                  (MonadError (..))
+import           Control.Monad.IO.Class
+                 (liftIO)
 import           Control.Monad.Reader
 import           Control.Monad.STM
                  (atomically)
@@ -32,12 +34,14 @@ import           Control.Monad.Trans.Except
 import           Data.ByteString.Builder
                  (toLazyByteString)
 import qualified Data.ByteString.Lazy        as BSL
+import           Data.Either
+                 (either)
 import           Data.Foldable
-                 (for_, toList)
+                 (toList)
 import           Data.Functor.Alt
                  (Alt (..))
 import           Data.Maybe
-                 (maybeToList)
+                 (maybe, maybeToList)
 import           Data.Proxy
                  (Proxy (..))
 import           Data.Semigroup
@@ -48,7 +52,7 @@ import           Data.String
                  (fromString)
 import qualified Data.Text                   as T
 import           Data.Time.Clock
-                 (getCurrentTime)
+                 (UTCTime, getCurrentTime)
 import           GHC.Generics
 import           Network.HTTP.Media
                  (renderHeader)
@@ -158,19 +162,37 @@ performRequest req = do
         writeTVar cj newCookieJar
         pure newRequest
 
-  eResponse <- liftIO $ catchConnectionError $ Client.httpLbs request m
+  response <- maybe (requestWithoutCookieJar m request) (requestWithCookieJar m request) cookieJar'
-  case eResponse of
-    Left err -> throwError err
-    Right response -> do
-      for_ cookieJar' $ \cj -> liftIO $ do
-        now' <- getCurrentTime
-        atomically $ modifyTVar' cj (fst . Client.updateCookieJar response request now')
   let status = Client.responseStatus response
       status_code = statusCode status
       ourResponse = clientResponseToResponse response
   unless (status_code >= 200 && status_code < 300) $
       throwError $ FailureResponse ourResponse
   return ourResponse
+  where
+    requestWithoutCookieJar :: Client.Manager -> Client.Request -> ClientM (Client.Response BSL.ByteString)
+    requestWithoutCookieJar m' request' = do
+        eResponse <- liftIO . catchConnectionError $ Client.httpLbs request' m'
+        either throwError return eResponse
+
+    requestWithCookieJar :: Client.Manager -> Client.Request -> TVar Client.CookieJar -> ClientM (Client.Response BSL.ByteString)
+    requestWithCookieJar m' request' cj = do
+        eResponse <- liftIO . catchConnectionError . Client.withResponseHistory request' m' $ updateWithResponseCookies cj
+        either throwError return eResponse
+
+    updateWithResponseCookies :: TVar Client.CookieJar -> Client.HistoriedResponse Client.BodyReader -> IO (Client.Response BSL.ByteString)
+    updateWithResponseCookies cj responses = do
+        now <- getCurrentTime
+        bss <- Client.brConsume $ Client.responseBody fRes
+        let fRes' = fRes { Client.responseBody = BSL.fromChunks bss }
+        mapM_ (updateCookieJar now) $ Client.hrRedirects responses <> [(fReq, fRes')]
+        return fRes'
+      where
+          updateCookieJar :: UTCTime -> (Client.Request, Client.Response BSL.ByteString) -> IO ()
+          updateCookieJar now' (req', res') = atomically $ modifyTVar' cj (fst . Client.updateCookieJar res' req' now')
+
+          fReq = Client.hrFinalRequest responses
+          fRes = Client.hrFinalResponse responses
 
 clientResponseToResponse :: Client.Response a -> GenResponse a
 clientResponseToResponse r = Response