diff --git a/advLayer/advLayer.go b/advLayer/advLayer.go
index d1e67d1..923bfef 100644
--- a/advLayer/advLayer.go
+++ b/advLayer/advLayer.go
@@ -78,8 +78,8 @@ type Client interface {
 type SingleClient interface {
 	Client
 
-	//it's 0-rtt if payload is provided
-	Handshake(underlay net.Conn, payload []byte) (net.Conn, error)
+	//it may use 0-rtt if firstPayloadLen>0 && IsEarly() == true
+	Handshake(underlay net.Conn, firstPayloadLen int) (net.Conn, error)
 }
 
 //like grpc (h2) and quic (h3)
diff --git a/advLayer/ws/client.go b/advLayer/ws/client.go
index 3a36e22..60a1317 100644
--- a/advLayer/ws/client.go
+++ b/advLayer/ws/client.go
@@ -54,14 +54,13 @@ func (c *Client) IsEarly() bool {
 }
 
 //与服务端进行 websocket握手，并返回可直接用于读写 websocket 二进制数据的 net.Conn
-func (c *Client) Handshake(underlay net.Conn, ed []byte) (net.Conn, error) {
+func (c *Client) Handshake(underlay net.Conn, firstPayloadLen int) (net.Conn, error) {
 
-	if len(ed) > 0 {
+	if c.IsEarly() && firstPayloadLen > 0 && firstPayloadLen <= MaxEarlyDataLen {
 		// 我们要先返回一个 Conn, 然后读取到内层的 vless等协议的握手后，再进行实际的 ws握手
 		return &EarlyDataConn{
 			Conn: underlay,
 
-			earlyData:            ed,
 			requestURL:           c.requestURL,
 			firstHandshakeOkChan: make(chan int, 1),
 			dialer: &ws.Dialer{
@@ -134,7 +133,6 @@ type EarlyDataConn struct {
 	realWsConn net.Conn
 
 	notFirst             bool
-	earlyData            []byte
 	requestURL           *url.URL
 	firstHandshakeOkChan chan int
 
@@ -152,8 +150,7 @@ func (edc *EarlyDataConn) Write(p []byte) (int, error) {
 		outBuf := utils.GetBuf()
 		encoder := base64.NewEncoder(base64.RawURLEncoding, outBuf)
 
-		multiReader := io.MultiReader(bytes.NewReader(p), bytes.NewReader(edc.earlyData))
-		_, encerr := io.Copy(encoder, multiReader)
+		_, encerr := io.Copy(encoder, bytes.NewReader(p))
 		if encerr != nil {
 			close(edc.firstHandshakeOkChan)
 			return 0, utils.ErrInErr{ErrDesc: "Err when encode early data", ErrDetail: encerr}
diff --git a/advLayer/ws/server.go b/advLayer/ws/server.go
index 9a3caab..c9a8942 100644
--- a/advLayer/ws/server.go
+++ b/advLayer/ws/server.go
@@ -18,10 +18,6 @@ import (
 	"go.uber.org/zap"
 )
 
-// 2048 /3 = 682.6666...  (682 又 三分之二),
-// 683 * 4 = 2732, 你若不信，运行 we_test.go中的 TestBase64Len
-const MaxEarlyDataLen_Base64 = 2732
-
 var (
 	connectionBs = []byte("Connection")
 	upgradeBs    = []byte("Upgrade")
diff --git a/advLayer/ws/ws.go b/advLayer/ws/ws.go
index 0758027..cea959d 100644
--- a/advLayer/ws/ws.go
+++ b/advLayer/ws/ws.go
@@ -39,6 +39,11 @@ import (
 	"github.com/e1732a364fed/v2ray_simple/advLayer"
 )
 
+// 2048 /3 = 682.6666...  (682 又 三分之二),
+// 683 * 4 = 2732, 你若不信，运行 we_test.go中的 TestBase64Len
+const MaxEarlyDataLen_Base64 = 2732
+const MaxEarlyDataLen = 2048
+
 func init() {
 	advLayer.ProtocolsMap["ws"] = Creator{}
 }
diff --git a/advLayer/ws/ws_test.go b/advLayer/ws/ws_test.go
index fffadc7..d7f2337 100644
--- a/advLayer/ws/ws_test.go
+++ b/advLayer/ws/ws_test.go
@@ -88,7 +88,7 @@ func TestWs(t *testing.T) {
 		t.Log(err)
 		t.FailNow()
 	}
-	wsConn, err := cli.Handshake(tcpConn, nil)
+	wsConn, err := cli.Handshake(tcpConn, 0)
 	if err != nil {
 		t.Log(err)
 		t.FailNow()
diff --git a/main.go b/main.go
index 6cb8937..5ed087b 100644
--- a/main.go
+++ b/main.go
@@ -1301,13 +1301,12 @@ advLayerHandshakeStep:
 		//ws
 		default:
 
-			var ed []byte
+			var edlen int
 
 			if !hasInnerMux && advClient.IsEarly() && wlc != nil {
-				//若配置了 MaxEarlyDataLen，则我们先读一段;
-				ed = iics.firstPayload
-				iics.fallbackFirstBuffer = nil
-				iics.firstPayload = nil //防止vless 再写一遍firstpayload.
+
+				edlen = len(iics.firstPayload)
+
 			}
 
 			// 我们verysimple的架构是 ws握手之后，再进行vless握手
@@ -1318,7 +1317,7 @@ advLayerHandshakeStep:
 
 			wcs := advClient.(advLayer.SingleClient)
 
-			wc, err = wcs.Handshake(clientConn, ed)
+			wc, err = wcs.Handshake(clientConn, edlen)
 
 			if err != nil {
 				if ce := iics.CanLogErr("Failed in handshake Single AdvLayer"); ce != nil {
diff --git a/proxy/vmess/server.go b/proxy/vmess/server.go
index 6cbb33d..b61d151 100644
--- a/proxy/vmess/server.go
+++ b/proxy/vmess/server.go
@@ -245,16 +245,14 @@ func (s *Server) Handshake(underlay net.Conn) (tcpConn net.Conn, msgConn netLaye
 		targetAddr = ad
 
 		//verysimple 不支持v2ray中的 vmess 的 mux.cool
+
+	case cmd_muxcool_unimplemented:
+		returnErr = utils.ErrInErr{ErrDesc: "Vmess mux.cool is not supported by verysimple ", ErrDetail: utils.ErrInvalidData}
+
 	default:
-		//mux.cool的command的定义 在 v2ray源代码的 common/protocol/headers.go 的 RequestCommandMux。
 
-		if sc.cmd == cmd_muxcool_unimplemented {
-			returnErr = utils.ErrInErr{ErrDesc: "Vmess mux.cool is not supported by verysimple ", ErrDetail: utils.ErrInvalidData}
+		returnErr = utils.ErrInErr{ErrDesc: "Vmess Invalid command ", ErrDetail: utils.ErrInvalidData, Data: sc.cmd}
 
-		} else {
-			returnErr = utils.ErrInErr{ErrDesc: "Vmess Invalid command ", ErrDetail: utils.ErrInvalidData, Data: sc.cmd}
-
-		}
 		return
 	}
 
diff --git a/proxy/vmess/vmess.go b/proxy/vmess/vmess.go
index f275f1b..d2ebff7 100644
--- a/proxy/vmess/vmess.go
+++ b/proxy/vmess/vmess.go
@@ -61,7 +61,8 @@ const (
 const (
 	CmdTCP                    byte = 1
 	CmdUDP                    byte = 2
-	cmd_muxcool_unimplemented byte = 3
+	cmd_muxcool_unimplemented byte = 3 //mux.cool的command的定义 在 v2ray源代码的 common/protocol/headers.go 的 RequestCommandMux。
+
 )
 
 var getkeyBs = []byte("c48619fe-8f02-49e0-b9e9-edf763e17e21")