diff --git a/constants.go b/constants.go
index aaaf0a8..5a0d09c 100644
--- a/constants.go
+++ b/constants.go
@@ -23,4 +23,11 @@ const (
 
 	// DefaultKeepAlivePeriod is the default time for KeepAlivePeriod of connection.
 	DefaultKeepAlivePeriod = 0
+
+	// DefaultMaxMessageSize is default size for a message read from the peer
+	DefaultMaxMessageSize = 4096
+	// DefaultReadTimeout is default value of read timeout
+	DefaultReadTimeout = 0
+	// DefaultWriteTimeout is default value of write timeout
+	DefaultWriteTimeout = 0
 )
diff --git a/server.go b/server.go
index f52cbe5..7e97450 100644
--- a/server.go
+++ b/server.go
@@ -72,11 +72,15 @@ func (s *server) Stop() {
 	s.stopWg.Wait()
 	s.stopChan = nil
 
-	s.sh.OnStop()
+	s.sh.OnStop(s.ctx)
 
 	logging.Logger().Info(fmt.Sprintf("Server[%s] is stopped", s.sh.GetName()))
 }
 
+func (s *server) Context() ServerContext {
+	return s.ctx
+}
+
 func handleServer(s *server) {
 	defer s.stopWg.Done()
 
@@ -118,35 +122,44 @@ func handleServer(s *server) {
 			continue
 		}
 
+		var err error
+		var socketID string
+		socketHandler := s.sh.GetSocketHandler()
+
+		if socketID = socketHandler.Handshake(s.ctx, conn); "" == socketID {
+			logging.Logger().Error(fmt.Sprintf("Server: Handshake err addr[%s] %v", conn.RemoteAddr(), conn))
+			conn.Close()
+			continue
+		}
+		socketCTX := socketHandler.SocketContext(s.ctx)
+		soc := newSocket(socketHandler, socketCTX, conn, socketID)
+		logging.Logger().Debug(fmt.Sprintf("Server: Client[%s] is connected.", soc.RemoteAddr()))
+
+		socketHandler.addSocket(soc)
+		socketHandler.OnConnect(soc)
+
 		s.stopWg.Add(1)
-		go handleConnection(s, conn)
+		go handleConnection(s, soc, socketHandler)
 	}
 }
 
-func handleConnection(s *server, conn net.Conn) {
+func handleConnection(s *server, soc Socket, socketHandler SocketHandler) {
 	defer s.stopWg.Done()
 
-	var err error
-	if conn, err = s.sh.OnConnect(conn); nil != err {
-		logging.Logger().Error(fmt.Sprintf("Server: connecting[%s] failed %v", conn.RemoteAddr(), err))
-		return
-	}
-
-	logging.Logger().Debug(fmt.Sprintf("Server: Client[%s] is connected.", conn.RemoteAddr()))
-
 	clientStopChan := make(chan struct{})
-	handleDoneChan := make(chan struct{})
+	handleDoneChan := make(chan error, 1)
 
-	go s.sh.Handle(conn, clientStopChan, handleDoneChan)
+	go socketHandler.Handle(soc, clientStopChan, handleDoneChan)
 
 	select {
 	case <-s.stopChan:
 		close(clientStopChan)
-		conn.Close()
 		<-handleDoneChan
 	case <-handleDoneChan:
 		close(clientStopChan)
-		conn.Close()
-		logging.Logger().Debug(fmt.Sprintf("Server: Client[%s] is disconnected.", conn.RemoteAddr()))
+		socketHandler.OnDisconnect(soc)
+		logging.Logger().Debug(fmt.Sprintf("Server: Client[%s] is disconnected.", soc.RemoteAddr()))
+		socketHandler.removeSocket(soc)
+		soc.Close()
 	}
 }
diff --git a/server_handler.go b/server_handler.go
index 7df1395..d040fac 100644
--- a/server_handler.go
+++ b/server_handler.go
@@ -22,6 +22,7 @@ type ServerHandler interface {
 	OnStop(serverCTX ServerContext)
 
 	GetName() string
+	GetSocketHandler() SocketHandler
 
 	Validate()
 }
diff --git a/server_handlers.go b/server_handlers.go
index 4b47c5c..0a29a5e 100644
--- a/server_handlers.go
+++ b/server_handlers.go
@@ -2,7 +2,10 @@ package server
 
 import (
 	"errors"
+	"fmt"
 	"net"
+
+	"git.loafle.net/commons_go/logging"
 )
 
 func NewServerHandler() ServerHandler {
@@ -10,36 +13,51 @@ func NewServerHandler() ServerHandler {
 	return sh
 }
 
+type ServerHandlers struct {
+	// Server name for sending in response headers.
+	//
+	// Default server name is used if left blank.
+	Name string
+
+	SocketHandler SocketHandler
+}
+
 func (sh *ServerHandlers) ServerContext() ServerContext {
 	return newServerContext()
 }
 
 func (sh *ServerHandlers) Init(serverCTX ServerContext) error {
-	// no op
+	if err := sh.SocketHandler.Init(serverCTX); nil != err {
+		return err
+	}
+
+	return nil
 }
 
 func (sh *ServerHandlers) Listen(serverCTX ServerContext) (net.Listener, error) {
 	return nil, errors.New("Server: Handler method[Listen] of Server is not implement")
 }
 
-func (sh *ServerHandlers) OnStart(serverCTX ServerContext) {
-	// no op
-}
-
 func (sh *ServerHandlers) OnError(serverCTX ServerContext, conn net.Conn, status int, reason error) {
-
+	logging.Logger().Error(fmt.Sprintf("Server: error status: %d, reason: %v, [%v]", status, reason, conn))
 }
 
 // OnStop invoked when server is stopped
 // If you override ths method, must call
 func (sh *ServerHandlers) OnStop(serverCTX ServerContext) {
-	// no op
+	sh.SocketHandler.Destroy()
 }
 
 func (sh *ServerHandlers) GetName() string {
 	return sh.Name
 }
 
-func (sh *ServerHandlers) Validate() {
-
+func (sh *ServerHandlers) GetSocketHandler() SocketHandler {
+	return sh.SocketHandler
+}
+
+func (sh *ServerHandlers) Validate() {
+	if nil == sh.SocketHandler {
+		panic("Server: SocketHandler must be specified")
+	}
 }
diff --git a/socket.go b/socket.go
index 07c9111..d8294fd 100644
--- a/socket.go
+++ b/socket.go
@@ -1,11 +1,9 @@
 package server
 
 import (
-	"io"
 	"net"
 	"sync"
 	"time"
-
 )
 
 type Socket interface {
@@ -21,7 +19,7 @@ func newSocket(socketHandler SocketHandler, socketCTX SocketContext, conn net.Co
 	s.Conn = conn
 	s.sh = socketHandler
 	s.id = id
-	s.SetReadLimit(socketHandler.GetMaxMessageSize())
+
 	if 0 < socketHandler.GetReadTimeout() {
 		s.SetReadDeadline(time.Now().Add(socketHandler.GetReadTimeout() * time.Second))
 	}
@@ -49,7 +47,6 @@ func (s *netSocket) ID() string {
 	return s.id
 }
 
-
 func (s *netSocket) Close() error {
 	err := s.Conn.Close()
 	releaseSocket(s)
diff --git a/socket_handlers.go b/socket_handlers.go
index 2216dfc..ddfe153 100644
--- a/socket_handlers.go
+++ b/socket_handlers.go
@@ -31,7 +31,7 @@ func (sh *SocketHandlers) Init(serverCTX ServerContext) error {
 }
 
 func (sh *SocketHandlers) Handshake(serverCTX ServerContext, conn net.Conn) (id string) {
-	return "", nil
+	return ""
 }
 
 func (sh *SocketHandlers) SocketContext(serverCTX ServerContext) SocketContext {