diff --git a/happstack-server.cabal b/happstack-server.cabal
--- a/happstack-server.cabal
+++ b/happstack-server.cabal
@@ -1,5 +1,5 @@
 Name:                happstack-server
-Version:             6.2.3
+Version:             6.2.4
 Synopsis:            Web related tools and services.
 Description:         Happstack Server provides an HTTP server and a rich set of functions for routing requests, handling query parameters, generating responses, working with cookies, serving files, and more. For in-depth documentation see the Happstack Crash Course <http://happstack.com/docs/crashcourse/index.html>
 License:             BSD3
diff --git a/src/Happstack/Server/Response.hs b/src/Happstack/Server/Response.hs
--- a/src/Happstack/Server/Response.hs
+++ b/src/Happstack/Server/Response.hs
@@ -137,6 +137,13 @@
 
 instance ToMessage Response where
     toResponse = id
+
+instance ToMessage L.ByteString where
+    toResponse bs = Response 200 M.empty nullRsFlags bs Nothing
+
+instance ToMessage B.ByteString where
+    toResponse bs = toResponse (L.fromChunks [bs])
+
 {-
 
 -- This instances causes awful error messages. I am removing it and