diff --git a/component/sniffing/conn_sniffer.go b/component/sniffing/conn_sniffer.go
index 8cf100f..0ea4c59 100644
--- a/component/sniffing/conn_sniffer.go
+++ b/component/sniffing/conn_sniffer.go
@@ -9,48 +9,28 @@ import (
 	"errors"
 	"net"
 	"strings"
-	"sync"
-	"time"
 )
 
 type ConnSniffer struct {
 	net.Conn
-	sniffer *Sniffer
-
-	mu sync.Mutex
+	*Sniffer
 }
 
 func NewConnSniffer(conn net.Conn, snifferBufSize int) *ConnSniffer {
 	s := &ConnSniffer{
 		Conn:    conn,
-		sniffer: NewStreamSniffer(conn, snifferBufSize),
+		Sniffer: NewStreamSniffer(conn, snifferBufSize),
 	}
 	return s
 }
-func (s *ConnSniffer) SniffTcp() (d string, err error) {
-	s.Conn.SetReadDeadline(time.Now().Add(100 * time.Millisecond))
-	defer s.Conn.SetReadDeadline(time.Time{})
-	d, err = s.sniffer.SniffTcp()
-	if err != nil {
-		var netError net.Error
-		if errors.As(err, &netError) && netError.Timeout() {
-			return "", NotApplicableError
-		}
-		return "", err
-	}
-	return d, nil
-}
 
 func (s *ConnSniffer) Read(p []byte) (n int, err error) {
-	s.mu.Lock()
-	n, err = s.sniffer.Read(p)
-	s.mu.Unlock()
-	return n, err
+	return s.Sniffer.Read(p)
 }
 
 func (s *ConnSniffer) Close() (err error) {
 	var errs []string
-	if err = s.sniffer.Close(); err != nil {
+	if err = s.Sniffer.Close(); err != nil {
 		errs = append(errs, err.Error())
 	}
 	if err = s.Conn.Close(); err != nil {
diff --git a/component/sniffing/sniffer.go b/component/sniffing/sniffer.go
index 4cfebda..94d918a 100644
--- a/component/sniffing/sniffer.go
+++ b/component/sniffing/sniffer.go
@@ -6,9 +6,11 @@
 package sniffing
 
 import (
-	"github.com/mzz2017/softwind/pool"
+	"errors"
 	"io"
+	"net"
 	"sync"
+	"time"
 )
 
 type Sniffer struct {
@@ -42,12 +44,26 @@ func (s *Sniffer) SniffTcp() (d string, err error) {
 	s.readMu.Lock()
 	defer s.readMu.Unlock()
 	if s.stream {
-		n, err := s.r.Read(s.buf)
+		r, isConn := s.r.(net.Conn)
+		if isConn {
+			// Set timeout.
+			r.SetReadDeadline(time.Now().Add(100 * time.Millisecond))
+		}
+		n, err := r.Read(s.buf)
+		if isConn {
+			// Recover.
+			r.SetReadDeadline(time.Time{})
+		}
 		s.buf = s.buf[:n]
 		if err != nil {
+			var netError net.Error
+			if isConn && errors.As(err, &netError) && netError.Timeout() {
+				goto sniff
+			}
 			return "", err
 		}
 	}
+sniff:
 	if len(s.buf) == 0 {
 		return "", NotApplicableError
 	}
@@ -76,9 +92,6 @@ func (s *Sniffer) Read(p []byte) (n int, err error) {
 		n = copy(p, s.buf[s.bufAt:])
 		s.bufAt += n
 		if s.bufAt >= len(s.buf) {
-			if s.stream {
-				pool.Put(s.buf)
-			}
 			s.buf = nil
 		}
 		return n, nil