diff --git a/Network/Wai/Logger.hs b/Network/Wai/Logger.hs
--- a/Network/Wai/Logger.hs
+++ b/Network/Wai/Logger.hs
@@ -1,3 +1,6 @@
+{-# LANGUAGE CPP   #-}
+{-# LANGUAGE GADTs #-}
+
 -- | Apache style logger for WAI applications.
 --
 -- An example:
@@ -5,7 +8,7 @@
 -- > {-# LANGUAGE OverloadedStrings #-}
 -- > module Main where
 -- >
--- > import Blaze.ByteString.Builder (fromByteString)
+-- > import Data.ByteString.Builder (byteString)
 -- > import Control.Monad.IO.Class (liftIO)
 -- > import qualified Data.ByteString.Char8 as BS
 -- > import Network.HTTP.Types (status200)
@@ -18,48 +21,54 @@
 -- >     run 3000 $ logApp aplogger
 -- >
 -- > logApp :: ApacheLogger -> Application
--- > logApp aplogger req = do
+-- > logApp aplogger req response = do
 -- >     liftIO $ aplogger req status (Just len)
--- >     return $ responseBuilder status hdr msg
+-- >     response $ responseBuilder status hdr msg
 -- >   where
 -- >     status = status200
--- >     hdr = [("Content-Type", "text/plain")
--- >           ,("Content-Length", BS.pack (show len))]
+-- >     hdr = [("Content-Type", "text/plain")]
 -- >     pong = "PONG"
+-- >     msg = byteString pong
 -- >     len = fromIntegral $ BS.length pong
--- >     msg = toLogStr pong
 
 module Network.Wai.Logger (
   -- * High level functions
     ApacheLogger
   , withStdoutLogger
+  , ServerPushLogger
   -- * Creating a logger
-  , ApacheLoggerActions(..)
+  , ApacheLoggerActions
+  , apacheLogger
+  , serverpushLogger
+  , logRotator
+  , logRemover
+  , initLoggerUser
   , initLogger
   -- * Types
   , IPAddrSource(..)
-  , LogType(..)
+  , LogType'(..), LogType
   , FileLogSpec(..)
-  -- * Date cacher
+  -- * Utilities
+  , showSockAddr
+  , logCheck
+  -- * Backward compability
   , clockDateCacher
   , ZonedDate
   , DateCacheGetter
   , DateCacheUpdater
-  -- * Utilities
-  , logCheck
-  , showSockAddr
   ) where
 
-import Control.AutoUpdate (mkAutoUpdate, defaultUpdateSettings, updateAction)
-import Control.Exception (handle, SomeException(..), bracket)
-import Control.Monad (when, void)
+#if __GLASGOW_HASKELL__ < 709
+import Control.Applicative ((<$>))
+#endif
+import Control.Exception (bracket)
+import Control.Monad (void)
+import Data.ByteString (ByteString)
 import Network.HTTP.Types (Status)
 import Network.Wai (Request)
-import System.IO (withFile, hFileSize, IOMode(..))
 import System.Log.FastLogger
 
 import Network.Wai.Logger.Apache
-import Network.Wai.Logger.Date
 import Network.Wai.Logger.IP (showSockAddr)
 
 ----------------------------------------------------------------
@@ -72,8 +81,8 @@
     app aplogger
   where
     setup = do
-        (getter, _updater) <- clockDateCacher
-        apf <- initLogger FromFallback (LogStdout 4096) getter
+        tgetter <- newTimeCache simpleTimeFormat
+        apf <- initLogger FromFallback (LogStdout 4096) tgetter
         let aplogger = apacheLogger apf
             remover = logRemover apf
         return (aplogger, remover)
@@ -84,118 +93,89 @@
 -- | Apache style logger.
 type ApacheLogger = Request -> Status -> Maybe Integer -> IO ()
 
+-- | HTTP/2 server push logger in Apache style.
+type ServerPushLogger = Request -> ByteString -> Integer -> IO ()
+
+-- | Function set of Apache style logger.
 data ApacheLoggerActions = ApacheLoggerActions {
+    -- | The Apache logger.
     apacheLogger :: ApacheLogger
-    -- | Rotating log files.
-    --   This is explicitly called from your program.
-    --   Probably, 10 seconds is proper.
+    -- | The HTTP/2 server push logger.
+  , serverpushLogger :: ServerPushLogger
+    -- | This is obsoleted. Rotation is done on-demand.
+    --   So, this is now an empty action.
   , logRotator :: IO ()
-    -- | Removing resources relating Apache logger.
+    -- | Removing resources relating to Apache logger.
+    --   E.g. flushing and deallocating internal buffers.
   , logRemover :: IO ()
   }
 
--- | Logger Type.
-data LogType = LogNone                     -- ^ No logging.
-             | LogStdout BufSize           -- ^ Logging to stdout.
-                                           --   'BufSize' is a buffer size
-                                           --   for each capability.
-             | LogFile FileLogSpec BufSize -- ^ Logging to a file.
-                                           --   'BufSize' is a buffer size
-                                           --   for each capability.
-             | LogCallback (LogStr -> IO ()) (IO ())
-
 ----------------------------------------------------------------
 
--- |
--- Creating 'ApacheLogger' according to 'LogType'.
-initLogger :: IPAddrSource -> LogType -> DateCacheGetter
-           -> IO ApacheLoggerActions
-initLogger _     LogNone             _       = noLoggerInit
-initLogger ipsrc (LogStdout size)    dateget = stdoutLoggerInit ipsrc size dateget
-initLogger ipsrc (LogFile spec size) dateget = fileLoggerInit ipsrc spec size dateget
-initLogger ipsrc (LogCallback cb flush) dateget = callbackLoggerInit ipsrc cb flush dateget
-
-----------------------------------------------------------------
-
-noLoggerInit :: IO ApacheLoggerActions
-noLoggerInit = return ApacheLoggerActions {
-    apacheLogger = noLogger
-  , logRotator = noRotator
-  , logRemover = noRemover
-  }
-  where
-    noLogger _ _ _ = return ()
-    noRotator = return ()
-    noRemover = return ()
-
-stdoutLoggerInit :: IPAddrSource -> BufSize -> DateCacheGetter
-                 -> IO ApacheLoggerActions
-stdoutLoggerInit ipsrc size dateget = do
-    lgrset <- newStdoutLoggerSet size
-    let logger = apache (pushLogStr lgrset) ipsrc dateget
-        noRotator = return ()
-        remover = rmLoggerSet lgrset
-    return ApacheLoggerActions {
-        apacheLogger = logger
-      , logRotator = noRotator
-      , logRemover = remover
-      }
-
-fileLoggerInit :: IPAddrSource -> FileLogSpec -> BufSize -> DateCacheGetter
+-- | Creating 'ApacheLogger' according to 'LogType'.
+initLoggerUser :: ToLogStr user => Maybe (Request -> Maybe user) -> IPAddrSource -> LogType -> IO FormattedTime
                -> IO ApacheLoggerActions
-fileLoggerInit ipsrc spec size dateget = do
-    lgrset <- newFileLoggerSet size $ log_file spec
-    let logger = apache (pushLogStr lgrset) ipsrc dateget
-        rotator = logFileRotator lgrset spec
-        remover = rmLoggerSet lgrset
-    return ApacheLoggerActions {
-        apacheLogger = logger
-      , logRotator = rotator
-      , logRemover = remover
+initLoggerUser ugetter ipsrc typ tgetter = do
+    (fl, cleanUp) <- newFastLogger typ
+    return $ ApacheLoggerActions {
+        apacheLogger     = apache fl ipsrc ugetter tgetter
+      , serverpushLogger = serverpush fl ipsrc ugetter tgetter
+      , logRotator       = return ()
+      , logRemover       = cleanUp
       }
 
-callbackLoggerInit :: IPAddrSource -> (LogStr -> IO ()) -> IO () -> DateCacheGetter
-                   -> IO ApacheLoggerActions
-callbackLoggerInit ipsrc cb flush dateget = do
-    flush' <- mkAutoUpdate defaultUpdateSettings
-        { updateAction = flush
-        }
-    let logger a b c = apache cb ipsrc dateget a b c >> flush'
-        noRotator = return ()
-        remover = return ()
-    return ApacheLoggerActions {
-        apacheLogger = logger
-      , logRotator = noRotator
-      , logRemover = remover
-      }
+initLogger :: IPAddrSource -> LogType -> IO FormattedTime
+           -> IO ApacheLoggerActions
+initLogger = initLoggerUser nouser
+  where
+    nouser :: Maybe (Request -> Maybe ByteString)
+    nouser = Nothing
 
+--- | Checking if a log file can be written if 'LogType' is 'LogFileNoRotate' or 'LogFile'.
+logCheck :: LogType -> IO ()
+logCheck LogNone          = return ()
+logCheck (LogStdout _)    = return ()
+logCheck (LogStderr _)    = return ()
+logCheck (LogFileNoRotate fp _)      = check fp
+logCheck (LogFile spec _)            = check (log_file spec)
+logCheck (LogFileTimedRotate spec _) = check (timed_log_file spec)
+logCheck (LogCallback _ _) = return ()
+
 ----------------------------------------------------------------
 
-apache :: (LogStr -> IO ()) -> IPAddrSource -> DateCacheGetter -> ApacheLogger
-apache cb ipsrc dateget req st mlen = do
+apache :: ToLogStr user => (LogStr -> IO ()) -> IPAddrSource -> Maybe (Request -> Maybe user) -> IO FormattedTime -> ApacheLogger
+apache cb ipsrc userget dateget req st mlen = do
     zdata <- dateget
-    cb (apacheLogStr ipsrc zdata req st mlen)
+    cb (apacheLogStr ipsrc (justGetUser userget) zdata req st mlen)
 
-----------------------------------------------------------------
+serverpush :: ToLogStr user => (LogStr -> IO ()) -> IPAddrSource -> Maybe (Request -> Maybe user) -> IO FormattedTime -> ServerPushLogger
+serverpush cb ipsrc userget dateget req path size = do
+    zdata <- dateget
+    cb (serverpushLogStr ipsrc (justGetUser userget) zdata req path size)
 
-logFileRotator :: LoggerSet -> FileLogSpec -> IO ()
-logFileRotator lgrset spec = do
-    over <- isOver
-    when over $ do
-        rotate spec
-        renewLoggerSet lgrset
-  where
-    file = log_file spec
-    isOver = handle (\(SomeException _) -> return False) $ do
-        siz <- withFile file ReadMode hFileSize
-        return (siz > log_file_size spec)
+---------------------------------------------------------------
 
-----------------------------------------------------------------
+-- | Getting cached 'ZonedDate'.
+type DateCacheGetter = IO ZonedDate
 
+-- | Updateing cached 'ZonedDate'. This should be called every second.
+--   See the source code of 'withStdoutLogger'.
+type DateCacheUpdater = IO ()
+
+-- | A type for zoned date.
+type ZonedDate = FormattedTime
+
 -- |
--- Checking if a log file can be written if 'LogType' is 'LogFile'.
-logCheck :: LogType -> IO ()
-logCheck LogNone          = return ()
-logCheck (LogStdout _)    = return ()
-logCheck (LogFile spec _) = check spec
-logCheck (LogCallback _ _) = return ()
+-- Returning 'DateCacheGetter' and 'DateCacheUpdater'.
+--
+-- Note: Since version 2.1.2, this function uses the auto-update package
+-- internally, and therefore the @DateCacheUpdater@ value returned need
+-- not be called. To wit, the return value is in fact an empty action.
+clockDateCacher :: IO (DateCacheGetter, DateCacheUpdater)
+clockDateCacher = do
+    tgetter <- newTimeCache simpleTimeFormat
+    return (tgetter, return ())
+
+justGetUser :: Maybe (Request -> Maybe user) -> (Request -> Maybe user)
+justGetUser (Just getter) = getter
+justGetUser Nothing       = \_ -> Nothing
diff --git a/Network/Wai/Logger/Apache.hs b/Network/Wai/Logger/Apache.hs
--- a/Network/Wai/Logger/Apache.hs
+++ b/Network/Wai/Logger/Apache.hs
@@ -1,53 +1,78 @@
-{-# LANGUAGE OverloadedStrings, CPP #-}
+{-# LANGUAGE OverloadedStrings, CPP, TupleSections #-}
 
 module Network.Wai.Logger.Apache (
     IPAddrSource(..)
   , apacheLogStr
+  , serverpushLogStr
   ) where
 
 #ifndef MIN_VERSION_base
 #define MIN_VERSION_base(x,y,z) 1
 #endif
+#ifndef MIN_VERSION_wai
+#define MIN_VERSION_wai(x,y,z) 1
+#endif
 
 import Data.ByteString.Char8 (ByteString)
 import qualified Data.ByteString.Char8 as BS
-import Data.CaseInsensitive (CI)
 import Data.List (find)
 import Data.Maybe (fromMaybe)
 #if MIN_VERSION_base(4,5,0)
-import Data.Monoid ((<>))
+import Data.Monoid ((<>), First (..))
 #else
 import Data.Monoid (mappend)
 #endif
 import Network.HTTP.Types (Status, statusCode)
+import Network.HTTP.Types.Header (HeaderName)
 import Network.Wai (Request(..))
-import Network.Wai.Logger.Date
 import Network.Wai.Logger.IP
 import System.Log.FastLogger
 
 -- $setup
 -- >>> :set -XOverloadedStrings
--- >>> import Network.Wai.Test
+-- >>> import Network.Wai (defaultRequest)
 
 -- | Source from which the IP source address of the client is obtained.
 data IPAddrSource =
   -- | From the peer address of the HTTP connection.
     FromSocket
-  -- | From X-Real-IP: or X-Forwarded-For: in the HTTP header.
+  -- | From @X-Real-IP@ or @X-Forwarded-For@ in the HTTP header.
+  --
+  -- This picks either @X-Real-IP@ or @X-Forwarded-For@ depending on which of these
+  -- headers comes first in the ordered list of request headers.
+  --
+  -- If the @X-Forwarded-For@ header is picked, the value will be assumed to be a
+  -- comma-separated list of IP addresses.  The value will be parsed, and the
+  -- left-most IP address will be used (which is mostly likely to be the actual
+  -- client IP address).
   | FromHeader
-  -- | From the peer address if header is not found.
+  -- | From a custom HTTP header, useful in proxied environment.
+  --
+  -- The header value will be assumed to be a comma-separated list of IP
+  -- addresses.  The value will be parsed, and the left-most IP address will be
+  -- used (which is mostly likely to be the actual client IP address).
+  --
+  -- Note that this still works as expected for a single IP address.
+  | FromHeaderCustom [HeaderName]
+  -- | Just like 'FromHeader', but falls back on the peer address if header is not found.
   | FromFallback
+  -- | This gives you the most flexibility to figure out the IP source address
+  -- from the 'Request'.  The returned 'ByteString' is used as the IP source
+  -- address.
+  | FromRequest (Request -> ByteString)
 
 -- | Apache style log format.
-apacheLogStr :: IPAddrSource -> ZonedDate -> Request -> Status -> Maybe Integer -> LogStr
-apacheLogStr ipsrc tmstr req status msize =
+apacheLogStr :: ToLogStr user => IPAddrSource -> (Request -> Maybe user) -> FormattedTime -> Request -> Status -> Maybe Integer -> LogStr
+apacheLogStr ipsrc userget tmstr req status msize =
       toLogStr (getSourceIP ipsrc req)
-  <> " - - ["
+  <> " - "
+  <> maybe "-" toLogStr (userget req)
+  <> " ["
   <> toLogStr tmstr
   <> "] \""
   <> toLogStr (requestMethod req)
   <> " "
-  <> toLogStr (rawPathInfo req)
+  <> toLogStr path
   <> " "
   <> toLogStr (show (httpVersion req))
   <> "\" "
@@ -55,24 +80,57 @@
   <> " "
   <> toLogStr (maybe "-" show msize)
   <> " \""
-  <> toLogStr (lookupRequestField' "referer" req)
+  <> toLogStr (fromMaybe "" mr)
   <> "\" \""
-  <> toLogStr (lookupRequestField' "user-agent" req)
+  <> toLogStr (fromMaybe "" mua)
   <> "\"\n"
   where
+    path = rawPathInfo req <> rawQueryString req
 #if !MIN_VERSION_base(4,5,0)
     (<>) = mappend
 #endif
-
-lookupRequestField' :: CI ByteString -> Request -> ByteString
-lookupRequestField' k req = fromMaybe "" . lookup k $ requestHeaders req
+#if MIN_VERSION_wai(3,2,0)
+    mr  = requestHeaderReferer req
+    mua = requestHeaderUserAgent req
+#else
+    mr  = lookup "referer" $ requestHeaders req
+    mua = lookup "user-agent" $ requestHeaders req
+#endif
 
--- getSourceIP = getSourceIP fromString fromByteString
+-- | HTTP/2 Push log format in the Apache style.
+serverpushLogStr :: ToLogStr user => IPAddrSource -> (Request -> Maybe user) -> FormattedTime -> Request -> ByteString -> Integer -> LogStr
+serverpushLogStr ipsrc userget tmstr req path size =
+      toLogStr (getSourceIP ipsrc req)
+  <> " - "
+  <> maybe "-" toLogStr (userget req)
+  <> " ["
+  <> toLogStr tmstr
+  <> "] \"PUSH "
+  <> toLogStr path
+  <> " HTTP/2\" 200 "
+  <> toLogStr (show size)
+  <> " \""
+  <> toLogStr ref
+  <> "\" \""
+  <> toLogStr (fromMaybe "" mua)
+  <> "\"\n"
+  where
+    ref  = rawPathInfo req
+#if !MIN_VERSION_base(4,5,0)
+    (<>) = mappend
+#endif
+#if MIN_VERSION_wai(3,2,0)
+    mua = requestHeaderUserAgent req
+#else
+    mua = lookup "user-agent" $ requestHeaders req
+#endif
 
 getSourceIP :: IPAddrSource -> Request -> ByteString
-getSourceIP FromSocket   = getSourceFromSocket
-getSourceIP FromHeader   = getSourceFromHeader
+getSourceIP FromSocket = getSourceFromSocket
+getSourceIP FromHeader = getSourceFromHeader
 getSourceIP FromFallback = getSourceFromFallback
+getSourceIP (FromHeaderCustom hs) = fromMaybe "-" . getSourceFromHeaderCustom hs
+getSourceIP (FromRequest fromReq) = fromReq
 
 -- |
 -- >>> getSourceFromSocket defaultRequest
@@ -86,11 +144,25 @@
 -- >>> getSourceFromHeader defaultRequest { requestHeaders = [ ("X-Forwarded-For", "127.0.0.1") ] }
 -- "127.0.0.1"
 -- >>> getSourceFromHeader defaultRequest { requestHeaders = [ ("Something", "127.0.0.1") ] }
--- ""
+-- "-"
 -- >>> getSourceFromHeader defaultRequest { requestHeaders = [] }
--- ""
+-- "-"
+--
+-- 'getSourceFromHeader' uses the first instance of either @"X-Real-IP"@ or
+-- @"X-Forwarded-For"@ that it finds in the ordered header list:
+--
+-- >>> getSourceFromHeader defaultRequest { requestHeaders = [ ("X-Real-IP", "1.2.3.4"), ("X-Forwarded-For", "5.6.7.8") ] }
+-- "1.2.3.4"
+-- >>> getSourceFromHeader defaultRequest { requestHeaders = [ ("X-Forwarded-For", "5.6.7.8"), ("X-Real-IP", "1.2.3.4") ] }
+-- "5.6.7.8"
+--
+-- 'getSourceFromHeader' handles pulling out the first IP in the
+-- comma-separated IP list in X-Forwarded-For:
+--
+-- >>> getSourceFromHeader defaultRequest { requestHeaders = [ ("X-Forwarded-For", "5.6.7.8, 10.11.12.13, 1.2.3.4") ] }
+-- "5.6.7.8"
 getSourceFromHeader :: Request -> ByteString
-getSourceFromHeader = fromMaybe "" . getSource
+getSourceFromHeader = fromMaybe "-" . getSource
 
 -- |
 -- >>> getSourceFromFallback defaultRequest { requestHeaders = [ ("X-Real-IP", "127.0.0.1") ] }
@@ -101,6 +173,20 @@
 -- "0.0.0.0"
 -- >>> getSourceFromFallback defaultRequest { requestHeaders = [] }
 -- "0.0.0.0"
+--
+-- 'getSourceFromFallback' uses the first instance of either @"X-Real-IP"@ or
+-- @"X-Forwarded-For"@ that it finds in the ordered header list:
+--
+-- >>> getSourceFromFallback defaultRequest { requestHeaders = [ ("X-Real-IP", "1.2.3.4"), ("X-Forwarded-For", "5.6.7.8") ] }
+-- "1.2.3.4"
+-- >>> getSourceFromFallback defaultRequest { requestHeaders = [ ("X-Forwarded-For", "5.6.7.8"), ("X-Real-IP", "1.2.3.4") ] }
+-- "5.6.7.8"
+--
+-- 'getSourceFromFallback' handles pulling out the first IP in the
+-- comma-separated IP list in X-Forwarded-For:
+--
+-- >>> getSourceFromFallback defaultRequest { requestHeaders = [ ("X-Forwarded-For", "5.6.7.8, 10.11.12.13, 1.2.3.4") ] }
+-- "5.6.7.8"
 getSourceFromFallback :: Request -> ByteString
 getSourceFromFallback req = fromMaybe (getSourceFromSocket req) $ getSource req
 
@@ -113,9 +199,73 @@
 -- Nothing
 -- >>> getSource defaultRequest
 -- Nothing
+--
+-- 'getSource' uses the first instance of either @"X-Real-IP"@ or
+-- @"X-Forwarded-For"@ that it finds in the ordered header list:
+--
+-- >>> getSource defaultRequest { requestHeaders = [ ("X-Real-IP", "1.2.3.4"), ("X-Forwarded-For", "5.6.7.8") ] }
+-- Just "1.2.3.4"
+-- >>> getSource defaultRequest { requestHeaders = [ ("X-Forwarded-For", "5.6.7.8"), ("X-Real-IP", "1.2.3.4") ] }
+-- Just "5.6.7.8"
+--
+-- 'getSource' handles pulling out the first IP in the comma-separated IP list
+-- in X-Forwarded-For:
+--
+-- >>> getSource defaultRequest { requestHeaders = [ ("X-Forwarded-For", "5.6.7.8, 10.11.12.13, 1.2.3.4") ] }
+-- Just "5.6.7.8"
 getSource :: Request -> Maybe ByteString
-getSource req = addr
+getSource = getSourceFromHeaders [("x-real-ip", id), ("x-forwarded-for", firstIpInXFF)]
+
+-- | Pull out the first IP in a comma-separated list of X-Forwarded-For IPs.
+--
+-- >>> firstIpInXFF "1.2.3.4, 5.6.7.8, 10.11.12.13"
+-- "1.2.3.4"
+--
+-- If there are no commas, just return the whole input ByteString:
+--
+-- >>> firstIpInXFF "5.6.7.8"
+-- "5.6.7.8"
+--
+-- Note that this function doesn't make sure the input is actually an IP address:
+--
+-- >>> firstIpInXFF "hello, world"
+-- "hello"
+firstIpInXFF :: ByteString -> ByteString
+firstIpInXFF = BS.takeWhile (/= ',')
+
+getSourceFromHeaders :: [(HeaderName, ByteString -> ByteString)] -> Request -> Maybe ByteString
+getSourceFromHeaders headerNamesAndPostProc req = getFirst $ foldMap f $ requestHeaders req
   where
-    maddr = find (\x -> fst x `elem` ["x-real-ip", "x-forwarded-for"]) hdrs
-    addr = fmap snd maddr
-    hdrs = requestHeaders req
+    -- Take a header name and value from the request, and try match it against
+    -- the list of headers and post-processing functions.  If it matches,
+    -- return the ByteString resulting from applying the post-processing function
+    -- to the header value.
+    f :: (HeaderName, ByteString) -> First ByteString
+    f (headerNameFromReq, headerValFromReq) =
+      let maybePostProc = find (\(headerNameFromPostProc, _) -> headerNameFromReq == headerNameFromPostProc) headerNamesAndPostProc
+      in First $ fmap (\(_, postProc) -> postProc headerValFromReq) maybePostProc
+
+-- |
+-- >>> getSourceFromHeaderCustom ["x-foobar"] defaultRequest { requestHeaders = [ ("X-catdog", "1.2.3.4"), ("X-Foobar", "5.6.7.8"), ("Other", "1.1.1.1") ] }
+-- Just "5.6.7.8"
+--
+-- If none of the headers in the passed-in list are in the 'Request', then return 'Nothing':
+--
+-- >>> getSourceFromHeaderCustom ["x-foobar", "baz"] defaultRequest { requestHeaders = [ ("abb", "1.2.3.4"), ("xyz", "5.6.7.8") ] }
+-- Nothing
+--
+-- 'getSourceFromHeaderCustom' uses the first instance of any header in the
+-- passed in list that it finds in the ordered header list from the request:
+--
+-- >>> getSourceFromHeaderCustom ["x-foobar", "baz"] defaultRequest { requestHeaders = [ ("baz", "1.2.3.4"), ("x-foobar", "5.6.7.8") ] }
+-- Just "1.2.3.4"
+--
+-- 'getSourceFromHeaderCustom' splits the value of the header it finds by @,@
+-- and uses the first item. This makes it easy to use with headers like
+-- @X-Forwarded-For@, which are expected to have a comma-separated list of IP
+-- addresses:
+--
+-- >>> getSourceFromHeaderCustom ["x-foobar"] defaultRequest { requestHeaders = [ ("X-Foobar", "5.6.7.8, 10.11.12.13, 1.2.3.4") ] }
+-- Just "5.6.7.8"
+getSourceFromHeaderCustom :: [HeaderName] -> Request -> Maybe ByteString
+getSourceFromHeaderCustom hs = getSourceFromHeaders (fmap (,firstIpInXFF) hs)
diff --git a/Network/Wai/Logger/Date.hs b/Network/Wai/Logger/Date.hs
deleted file mode 100644
--- a/Network/Wai/Logger/Date.hs
+++ /dev/null
@@ -1,84 +0,0 @@
-{-# LANGUAGE CPP, OverloadedStrings #-}
-
--- |
--- Formatting time is slow.
--- This package provides mechanisms to cache formatted date.
-module Network.Wai.Logger.Date (
-  -- * Types
-    DateCacheGetter
-  , DateCacheUpdater
-  , ZonedDate
-  -- * Cache configuration
-  , DateCacheConf(..)
-  , zonedDateCacheConf
-  -- * Date cacher
-  , clockDateCacher
-  ) where
-
-import Control.AutoUpdate (mkAutoUpdate, defaultUpdateSettings, updateAction)
-import Data.ByteString (ByteString)
-#if WINDOWS
-import qualified Data.ByteString.Char8 as BS
-import Data.Time
-import System.Locale
-#else
-import Data.UnixTime (formatUnixTime, fromEpochTime)
-import System.Posix (EpochTime, epochTime)
-#endif
-
-----------------------------------------------------------------
-
--- | Getting cached 'ZonedDate'.
-type DateCacheGetter = IO ZonedDate
--- | Updateing cached 'ZonedDate'. This should be called every second.
---   See the source code of 'withStdoutLogger'.
-type DateCacheUpdater = IO ()
-
-----------------------------------------------------------------
-
--- | A type for zoned date.
-type ZonedDate = ByteString
-
-----------------------------------------------------------------
-
-data DateCacheConf t = DateCacheConf {
-    -- | A function to get a time. E.g 'epochTime' and 'getCurrentTime'.
-    getTime :: IO t
-    -- | A function to format a time.
-  , formatDate :: t -> IO ByteString
-  }
-
-#if WINDOWS
--- | Zoned date cacher using UTC.
-zonedDateCacheConf :: DateCacheConf UTCTime
-zonedDateCacheConf = DateCacheConf {
-    getTime = getCurrentTime
-  , formatDate = \ut -> do
-      zt <- utcToLocalZonedTime ut
-      return $ BS.pack $ formatTime defaultTimeLocale "%d/%b/%Y:%T %z" zt
-  }
-#else
--- | Zoned date cacher using UnixTime.
-zonedDateCacheConf :: DateCacheConf EpochTime
-zonedDateCacheConf = DateCacheConf {
-    getTime = epochTime
-  , formatDate = formatUnixTime "%d/%b/%Y:%T %z" . fromEpochTime
-  }
-#endif
-
-----------------------------------------------------------------
-
--- |
--- Returning 'DateCacheGetter' and 'DateCacheUpdater'.
---
--- Note: Since version 2.1.2, this function uses the auto-update package
--- internally, and therefore the @DateCacheUpdater@ value returned need
--- not be called. To wit, the return value is in fact an empty action.
-
-clockDateCacher :: IO (DateCacheGetter, DateCacheUpdater)
-clockDateCacher = do
-    getter <- mkAutoUpdate defaultUpdateSettings
-        { updateAction = getTime zonedDateCacheConf
-                     >>= formatDate zonedDateCacheConf
-        }
-    return (getter, return ())
diff --git a/Network/Wai/Logger/IORef.hs b/Network/Wai/Logger/IORef.hs
new file mode 100644
--- /dev/null
+++ b/Network/Wai/Logger/IORef.hs
@@ -0,0 +1,20 @@
+{-# LANGUAGE CPP #-}
+
+module Network.Wai.Logger.IORef (
+       IORef
+     , newIORef
+     , readIORef
+     , writeIORef
+     , atomicModifyIORef'
+     ) where
+
+import Data.IORef
+
+#if !MIN_VERSION_base(4, 6, 0)
+atomicModifyIORef' :: IORef a -> (a -> (a,b)) -> IO b
+atomicModifyIORef' ref f = do
+    b <- atomicModifyIORef ref
+            (\x -> let (a, b) = f x
+                    in (a, a `seq` b))
+    b `seq` return b
+#endif
diff --git a/Network/Wai/Logger/IP.hs b/Network/Wai/Logger/IP.hs
--- a/Network/Wai/Logger/IP.hs
+++ b/Network/Wai/Logger/IP.hs
@@ -46,4 +46,4 @@
 showSockAddr (SockAddrInet6 _ _ (0,0,0x0000ffff,addr4) _) = showIPv4 addr4 False
 showSockAddr (SockAddrInet6 _ _ (0,0,0,1) _)              = "::1"
 showSockAddr (SockAddrInet6 _ _ addr6 _)                  = showIPv6 addr6
-showSockAddr _                                            = "unknownSocket"
+showSockAddr (SockAddrUnix _)                             = "-"
diff --git a/Setup.hs b/Setup.hs
--- a/Setup.hs
+++ b/Setup.hs
@@ -1,2 +1,7 @@
+{-# OPTIONS_GHC -Wall #-}
+module Main (main) where
+
 import Distribution.Simple
+
+main :: IO ()
 main = defaultMain
diff --git a/test/doctests.hs b/test/doctests.hs
deleted file mode 100644
--- a/test/doctests.hs
+++ /dev/null
@@ -1,11 +0,0 @@
-module Main where
-
-import Test.DocTest
-
-main :: IO ()
-main = doctest [
-    "-idist/build/autogen/"
-  , "-optP-include"
-  , "-optPdist/build/autogen/cabal_macros.h"
-  , "Network/Wai/Logger.hs"
-  ]
diff --git a/wai-logger.cabal b/wai-logger.cabal
--- a/wai-logger.cabal
+++ b/wai-logger.cabal
@@ -1,49 +1,39 @@
-Name:                   wai-logger
-Version:                2.2.0
-Author:                 Kazu Yamamoto <kazu@iij.ad.jp>
-Maintainer:             Kazu Yamamoto <kazu@iij.ad.jp>
-License:                BSD3
-License-File:           LICENSE
-Synopsis:               A logging system for WAI
-Description:            A logging system for WAI
-Category:               Web, Yesod
-Cabal-Version:          >= 1.10
-Build-Type:             Simple
+cabal-version: >=1.10
+name:          wai-logger
+version:       2.5.0
+license:       BSD3
+license-file:  LICENSE
+maintainer:    Kazu Yamamoto <kazu@iij.ad.jp>
+author:        Kazu Yamamoto <kazu@iij.ad.jp>
+tested-with:
+    ghc ==7.8.4 || ==7.10.3 || ==8.0.2 || ==8.2.2 || ==8.4.4 || ==8.6.3
 
-Library
-  Default-Language:     Haskell2010
-  GHC-Options:          -Wall
-  Exposed-Modules:      Network.Wai.Logger
-  Other-Modules:        Network.Wai.Logger.Apache
-                        Network.Wai.Logger.Date
-                        Network.Wai.Logger.IP
-  Build-Depends:        base >= 4 && < 5
-                      , auto-update
-                      , blaze-builder
-                      , byteorder
-                      , bytestring
-                      , case-insensitive
-                      , fast-logger >= 2.2
-                      , http-types
-                      , network
-                      , wai >= 2.0.0
-  if os(windows)
-      Cpp-Options:      -DWINDOWS
-      Build-Depends:    time
-                      , old-locale
-  else
-      Build-Depends:    unix
-                      , unix-time >= 0.2.2
+synopsis:      A logging system for WAI
+description:   A logging system for WAI(Web Application Interface)
+category:      Web, Yesod
+build-type:    Simple
 
-Test-Suite doctest
-  Type:                 exitcode-stdio-1.0
-  Default-Language:     Haskell2010
-  HS-Source-Dirs:       test
-  Ghc-Options:          -Wall
-  Main-Is:              doctests.hs
-  Build-Depends:        base
-                      , doctest
+source-repository head
+    type:     git
+    location: https://github.com/kazu-yamamoto/logger.git
 
-Source-Repository head
-  Type:                 git
-  Location:             git://github.com/kazu-yamamoto/logger.git
+library
+    exposed-modules:  Network.Wai.Logger
+    other-modules:
+        Network.Wai.Logger.Apache
+        Network.Wai.Logger.IP
+        Network.Wai.Logger.IORef
+
+    default-language: Haskell2010
+    ghc-options:      -Wall
+    build-depends:
+        base >=4 && <5,
+        byteorder,
+        bytestring,
+        fast-logger >=3,
+        http-types,
+        network,
+        wai >=2.0.0
+
+    if impl(ghc >=8)
+        default-extensions: Strict StrictData
