diff --git a/bamboo.cabal b/bamboo.cabal
--- a/bamboo.cabal
+++ b/bamboo.cabal
@@ -1,8 +1,8 @@
 Name:                 bamboo
-Version:              2009.4.50
+Version:              2009.4.52
 Build-type:           Simple
-Synopsis:             A simple blog engine on Hack
-Description:          A simple blog engine on Hack
+Synopsis:             A simple blog middleware on hack
+Description:          A simple blog middleware on hack
 License:              GPL
 License-file:         LICENSE
 Author:               Wang, Jinjing
@@ -15,7 +15,7 @@
 
 library
   ghc-options: -Wall -fno-warn-missing-signatures -fno-warn-name-shadowing -fno-warn-orphans -fno-warn-type-defaults
-  build-depends: base, cgi, network, haskell98, old-locale, old-time, time, unix, bytestring, template, base64-string, zlib, directory, ansi-wl-pprint, filepath, containers, process, mps >= 2008.11.6, parsedate >= 3000.0.0, rss >= 3000.0.1, xhtml, kibro >= 0.4.2, utf8-string >= 0.3.3, pandoc, parsec >= 2, MissingH, gravatar >= 0.3, data-default >= 0.2, hcheat >= 2008.11.6, hack >= 2009.4.30, hack-contrib >= 2009.4.50
+  build-depends: base, cgi, network, haskell98, old-locale, old-time, time, unix, bytestring, template, base64-string, zlib, directory, ansi-wl-pprint, filepath, containers, process, mps >= 2008.11.6, parsedate >= 3000.0.0, rss >= 3000.0.1, xhtml, kibro >= 0.4.2, utf8-string >= 0.3.3, pandoc, parsec >= 2, MissingH, gravatar >= 0.3, data-default >= 0.2, hcheat >= 2008.11.6, hack >= 2009.4.52, hack-contrib >= 2009.4.52
   hs-source-dirs: src/
   exposed-modules:  
                     Bamboo
diff --git a/changelog.md b/changelog.md
--- a/changelog.md
+++ b/changelog.md
@@ -1,3 +1,17 @@
+2009.4.52
+---------
+
+### Fix
+
+* Compatible with hack 4.52
+
+2009.4.51
+---------
+
+### Fix
+
+* use Content Length in new hack-contrib
+
 2009.4.50
 ---------
 
diff --git a/readme.md b/readme.md
--- a/readme.md
+++ b/readme.md
@@ -65,23 +65,13 @@
 
     cabal install happy
     cabal install rss --reinstall
-    cabal install hack
-    cabal install hack-contrib
     cabal install bamboo
 
-### Choose a hack handler
-
-#### Hyena
+### Pick a hack handler
 
-##### install hyena
+#### Happstack
 
-    cabal install network --reinstall
-    
-    git clone git://github.com/tibbe/hyena.git
-    cd hyena
-    cabal install
-    
-    cabal install hack-handler-hyena
+    cabal install hack-handler-happstack
 
 ##### get a starter kit ( template )
 
@@ -98,16 +88,16 @@
     module Main where
 
     import Bamboo
-    import Hack.Handler.Hyena
+    import Hack.Handler.Happstack
 
-    import Hack.Utils
+    import Hack.Contrib.Utils
     import Hack.Contrib.Middleware.ContentType
     import Hack.Contrib.Middleware.ContentSize
     import Hack.Contrib.Middleware.ShowExceptions
     import Hack.Contrib.Middleware.Static
 
 
-    import qualified Hack.Contrib.Head as H
+    import qualified Hack.Contrib.Middleware.Head as H
 
     default_content_type = "text/plain; charset=UTF-8"
 
@@ -134,6 +124,7 @@
     app = use middleware_stack dummy_app
 
     main = run app
+    
     
 
 ##### run
diff --git a/src/Bamboo.hs b/src/Bamboo.hs
--- a/src/Bamboo.hs
+++ b/src/Bamboo.hs
@@ -8,5 +8,5 @@
 import Hack
 import Hack.Contrib.Middleware.RawRouter
 
-bamboo :: MiddleWare
+bamboo :: Middleware
 bamboo = route paths 
diff --git a/src/Bamboo/Controller/Application.hs b/src/Bamboo/Controller/Application.hs
--- a/src/Bamboo/Controller/Application.hs
+++ b/src/Bamboo/Controller/Application.hs
@@ -55,7 +55,6 @@
   ] 
   .map_fst ((G.root /) > ("^" ++))
 
-
 only_for ext x = if has_extension ext then x else const not_found
 
 
diff --git a/src/Bamboo/Helper/Env.hs b/src/Bamboo/Helper/Env.hs
--- a/src/Bamboo/Helper/Env.hs
+++ b/src/Bamboo/Helper/Env.hs
@@ -40,3 +40,4 @@
 import System.Directory
 import Data.Foldable (find)
 import Data.Default
+
diff --git a/src/Bamboo/Helper/Helper.hs b/src/Bamboo/Helper/Helper.hs
--- a/src/Bamboo/Helper/Helper.hs
+++ b/src/Bamboo/Helper/Helper.hs
@@ -23,6 +23,7 @@
 import Data.Default
 import System.Directory
 import Hack
+import qualified Hack.Contrib.Request as Request
 import Hack.Contrib.Response
 import Hack.Contrib.Constants
 
@@ -65,12 +66,8 @@
 
 remove_trailing_slash s = if s.last.is '/' then s.init else s
 
-params env = do
-  case env.query_string of
-    [] -> []
-    s -> s.formDecode .map_snd ( unescape_unicode_xml > b2u)
-
-inputs = getInputs ^ map_snd (strip > unescape_unicode_xml > b2u)
+params = Request.params > map_fst b2u > map_snd b2u
+inputs = Request.inputs > map_fst b2u > map_snd b2u
 
 param_with_default s d env = env .get_param s .fromMaybe d
 input_with_default s d env = env .get_input s .fromMaybe d