clearCreds redirect behavior depends on request type.

yesod-auth/ChangeLog.md

@@ -1,5 +1,9 @@
 # ChangeLog for yesod-auth
 
+## 1.6.7
+
+* Redirect behavior of `clearCreds` depends on request type [#1598](https://github.com/yesodweb/yesod/pull/1598)
+
 ## 1.6.6
 
 * Deprecated `Yesod.Auth.GoogleEmail2`, see [#1579](https://github.com/yesodweb/yesod/issues/1579) and [migration blog post](https://pbrisbin.com/posts/googleemail2_deprecation/)

yesod-auth/Yesod/Auth.hs

@@ -421,14 +421,20 @@ authLayoutJson w json = selectRep $ do
 --
 -- @since 1.1.7
 clearCreds :: (MonadHandler m, YesodAuth (HandlerSite m))
-           => Bool -- ^ if HTTP redirect to 'logoutDest' should be done
+           => Bool -- ^ if HTTP, redirect to 'logoutDest'
            -> m ()
 clearCreds doRedirects = do
-    y <- getYesod
     onLogout
     deleteSession credsKey
-    when doRedirects $ do
+    y  <- getYesod
-        redirectUltDest $ logoutDest y
+    aj <- acceptsJson
+    case (aj, doRedirects) of
+      (True, _)               -> sendResponse successfulLogout
+      (False, True)           -> redirectUltDest (logoutDest y)
+      _                       -> return ()
+    where successfulLogout = object ["message" .= msg]
+          msg :: Text
+          msg = "Logged out successfully!"
 
 getCheckR :: AuthHandler master TypedContent
 getCheckR = do

yesod-auth/yesod-auth.cabal

@@ -1,5 +1,5 @@
 name:            yesod-auth
-version:         1.6.6
+version:         1.6.7
 license:         MIT
 license-file:    LICENSE
 author:          Michael Snoyman, Patrick Brisbin