diff --git a/addon/web/conn.go b/addon/web/conn.go
index 946d3d2..d7b4c86 100644
--- a/addon/web/conn.go
+++ b/addon/web/conn.go
@@ -130,14 +130,26 @@ func (c *concurrentConn) isIntercpt(f *flow.Flow, after *messageFlow) bool {
 
 // 拦截
 func (c *concurrentConn) waitIntercept(f *flow.Flow, after *messageFlow) {
-	log.Infof("waiting Intercept: %s\n", f.Request.URL)
 	ch := c.initWaitChan(f.Id.String())
 	msg := (<-ch).(*messageEdit)
-	log.Infof("waited Intercept: %s\n", f.Request.URL)
 
-	// f.Request.Method = req.Method
-	// f.Request.URL = req.URL
-	// f.Request.Header = req.Header
+	// drop
+	if msg.mType == messageTypeDropRequest || msg.mType == messageTypeDropResponse {
+		f.Response = &flow.Response{
+			StatusCode: 502,
+		}
+		return
+	}
 
-	log.Infof("waitIntercept: %v", msg)
+	// change
+	if msg.mType == messageTypeChangeRequest {
+		f.Request.Method = msg.request.Method
+		f.Request.URL = msg.request.URL
+		f.Request.Header = msg.request.Header
+		f.Request.Body = msg.request.Body
+	} else if msg.mType == messageTypeChangeResponse {
+		// TODO: statusCode
+		f.Response.Header = msg.response.Header
+		f.Response.Body = msg.response.Body
+	}
 }
diff --git a/addon/web/message.go b/addon/web/message.go
index 72681ac..a6d2b02 100644
--- a/addon/web/message.go
+++ b/addon/web/message.go
@@ -16,7 +16,7 @@ import (
 // messageFlow
 // version 1 byte + type 1 byte + id 36 byte + waitIntercept 1 byte + content left bytes
 
-// type: 11/12
+// type: 11/12/13/14
 // messageEdit
 // version 1 byte + type 1 byte + id 36 byte + header len 4 byte + header content bytes + body len 4 byte + [body content bytes]
 
@@ -36,6 +36,8 @@ const (
 
 	messageTypeChangeRequest  messageType = 11
 	messageTypeChangeResponse messageType = 12
+	messageTypeDropRequest    messageType = 13
+	messageTypeDropResponse   messageType = 14
 
 	messageTypeChangeBreakPointRules messageType = 21
 )
@@ -47,6 +49,8 @@ var allMessageTypes = []messageType{
 	messageTypeResponseBody,
 	messageTypeChangeRequest,
 	messageTypeChangeResponse,
+	messageTypeDropRequest,
+	messageTypeDropResponse,
 	messageTypeChangeBreakPointRules,
 }
 
@@ -115,8 +119,8 @@ type messageEdit struct {
 }
 
 func parseMessageEdit(data []byte) *messageEdit {
-	// 2 + 36 + 4 + 4
-	if len(data) < 46 {
+	// 2 + 36
+	if len(data) < 38 {
 		return nil
 	}
 
@@ -127,6 +131,20 @@ func parseMessageEdit(data []byte) *messageEdit {
 		return nil
 	}
 
+	msg := &messageEdit{
+		mType: mType,
+		id:    id,
+	}
+
+	if mType == messageTypeDropRequest || mType == messageTypeDropResponse {
+		return msg
+	}
+
+	// 2 + 36 + 4 + 4
+	if len(data) < 46 {
+		return nil
+	}
+
 	hl := (int)(binary.BigEndian.Uint32(data[38:42]))
 	if 42+hl+4 > len(data) {
 		return nil
@@ -139,11 +157,6 @@ func parseMessageEdit(data []byte) *messageEdit {
 	}
 	bodyContent := data[42+hl+4:]
 
-	msg := &messageEdit{
-		mType: mType,
-		id:    id,
-	}
-
 	if mType == messageTypeChangeRequest {
 		req := new(flow.Request)
 		err := json.Unmarshal(headerContent, req)
@@ -254,7 +267,7 @@ func parseMessage(data []byte) message {
 
 	mType := (messageType)(data[1])
 
-	if mType == messageTypeChangeRequest || mType == messageTypeChangeResponse {
+	if mType == messageTypeChangeRequest || mType == messageTypeChangeResponse || mType == messageTypeDropRequest || mType == messageTypeDropResponse {
 		return parseMessageEdit(data)
 	} else if mType == messageTypeChangeBreakPointRules {
 		return parseMessageMeta(data)