diff --git a/client/internal/highway/bdh.go b/client/internal/highway/bdh.go
index bfb70c61..3b1e8fc6 100644
--- a/client/internal/highway/bdh.go
+++ b/client/internal/highway/bdh.go
@@ -12,7 +12,6 @@ import (
 	"golang.org/x/sync/errgroup"
 
 	"github.com/Mrs4s/MiraiGo/binary"
-	"github.com/Mrs4s/MiraiGo/client/internal/network"
 	"github.com/Mrs4s/MiraiGo/client/pb"
 	"github.com/Mrs4s/MiraiGo/internal/proto"
 )
@@ -72,7 +71,7 @@ func (s *Session) UploadBDH(input BdhInput) ([]byte, error) {
 		}
 		ch := md5.Sum(chunk)
 		head, _ := proto.Marshal(&pb.ReqDataHighwayHead{
-			MsgBasehead: s.dataHighwayHead(4096, input.CommandID, 2052),
+			MsgBasehead: s.dataHighwayHead(_REQ_CMD_DATA, 4096, input.CommandID, 2052),
 			MsgSeghead: &pb.SegHead{
 				Filesize:      input.Size,
 				Dataoffset:    int64(offset),
@@ -84,7 +83,7 @@ func (s *Session) UploadBDH(input BdhInput) ([]byte, error) {
 			ReqExtendinfo: input.Ext,
 		})
 		offset += rl
-		frame := network.HeadBodyFrame(head, chunk)
+		frame := newFrame(head, chunk)
 		_, err = frame.WriteTo(conn)
 		if err != nil {
 			return nil, errors.Wrap(err, "write conn error")
@@ -178,7 +177,7 @@ func (s *Session) UploadBDHMultiThread(input BdhInput, threadCount int) ([]byte,
 			}
 			ch := md5.Sum(chunk)
 			head, _ := proto.Marshal(&pb.ReqDataHighwayHead{
-				MsgBasehead: s.dataHighwayHead(4096, input.CommandID, 2052),
+				MsgBasehead: s.dataHighwayHead(_REQ_CMD_DATA, 4096, input.CommandID, 2052),
 				MsgSeghead: &pb.SegHead{
 					Filesize:      input.Size,
 					Dataoffset:    off,
@@ -189,7 +188,7 @@ func (s *Session) UploadBDHMultiThread(input BdhInput, threadCount int) ([]byte,
 				},
 				ReqExtendinfo: input.Ext,
 			})
-			frame := network.HeadBodyFrame(head, chunk)
+			frame := newFrame(head, chunk)
 			_, err = frame.WriteTo(conn)
 			if err != nil {
 				return errors.Wrap(err, "write conn error")
diff --git a/client/internal/network/frame.go b/client/internal/highway/frame.go
similarity index 80%
rename from client/internal/network/frame.go
rename to client/internal/highway/frame.go
index 2b1b8f08..ba1b6b38 100644
--- a/client/internal/network/frame.go
+++ b/client/internal/highway/frame.go
@@ -1,4 +1,4 @@
-package network
+package highway
 
 import (
 	"encoding/binary"
@@ -7,15 +7,15 @@ import (
 
 var etx = []byte{0x29}
 
-// HeadBodyFrame 包格式
-// 	* STX
+// newFrame 包格式
+// 	* STX: 0x28(40)
 // 	* head length
 // 	* body length
 // 	* head data
 // 	* body data
-// 	* ETX
+// 	* ETX: 0x29(41)
 // 节省内存, 可被go runtime优化为writev操作
-func HeadBodyFrame(head []byte, body []byte) net.Buffers {
+func newFrame(head []byte, body []byte) net.Buffers {
 	buffers := make(net.Buffers, 4)
 	// buffer0 format:
 	// 	* STX
diff --git a/client/internal/highway/highway.go b/client/internal/highway/highway.go
index d031bc6d..83023c8f 100644
--- a/client/internal/highway/highway.go
+++ b/client/internal/highway/highway.go
@@ -12,12 +12,17 @@ import (
 	"github.com/pkg/errors"
 
 	"github.com/Mrs4s/MiraiGo/binary"
-	"github.com/Mrs4s/MiraiGo/client/internal/network"
 	"github.com/Mrs4s/MiraiGo/client/pb"
 	"github.com/Mrs4s/MiraiGo/internal/proto"
 	"github.com/Mrs4s/MiraiGo/utils"
 )
 
+// see com/tencent/mobileqq/highway/utils/BaseConstants.java#L120-L121
+const (
+	_REQ_CMD_DATA        = "PicUp.DataUp"
+	_REQ_CMD_HEART_BREAK = "PicUp.Echo"
+)
+
 type Session struct {
 	Uin        string
 	AppID      int32
@@ -74,7 +79,7 @@ func (s *Session) Upload(addr Addr, input Input) error {
 		}
 		ch := md5.Sum(chunk)
 		head, _ := proto.Marshal(&pb.ReqDataHighwayHead{
-			MsgBasehead: s.dataHighwayHead(4096, input.CommandID, 2052),
+			MsgBasehead: s.dataHighwayHead(_REQ_CMD_DATA, 4096, input.CommandID, 2052),
 			MsgSeghead: &pb.SegHead{
 				Filesize:      length,
 				Dataoffset:    int64(offset),
@@ -86,7 +91,7 @@ func (s *Session) Upload(addr Addr, input Input) error {
 			ReqExtendinfo: []byte{},
 		})
 		offset += rl
-		frame := network.HeadBodyFrame(head, chunk)
+		frame := newFrame(head, chunk)
 		_, err = frame.WriteTo(conn)
 		if err != nil {
 			return errors.Wrap(err, "write conn error")
@@ -134,7 +139,7 @@ func (s *Session) UploadExciting(input ExcitingInput) ([]byte, error) {
 		}
 		ch := md5.Sum(chunk)
 		head, _ := proto.Marshal(&pb.ReqDataHighwayHead{
-			MsgBasehead: s.dataHighwayHead(0, input.CommandID, 0),
+			MsgBasehead: s.dataHighwayHead(_REQ_CMD_DATA, 0, input.CommandID, 0),
 			MsgSeghead: &pb.SegHead{
 				Filesize:      fileLength,
 				Dataoffset:    offset,
@@ -146,7 +151,7 @@ func (s *Session) UploadExciting(input ExcitingInput) ([]byte, error) {
 			ReqExtendinfo: input.Ext,
 		})
 		offset += int64(rl)
-		frame := network.HeadBodyFrame(head, chunk)
+		frame := newFrame(head, chunk)
 		req, _ := http.NewRequest("POST", url, &frame)
 		req.Header.Set("Accept", "*/*")
 		req.Header.Set("Connection", "Keep-Alive")
@@ -182,33 +187,24 @@ func (s *Session) nextSeq() int32 {
 	return atomic.AddInt32(&s.seq, 2)
 }
 
-func (s *Session) dataHighwayHead(flag, cmd, locale int32) *pb.DataHighwayHead {
+func (s *Session) dataHighwayHead(cmd string, flag, cmdID, locale int32) *pb.DataHighwayHead {
 	return &pb.DataHighwayHead{
 		Version:   1,
 		Uin:       s.Uin,
-		Command:   "PicUp.DataUp",
+		Command:   cmd,
 		Seq:       s.nextSeq(),
 		Appid:     s.AppID,
 		Dataflag:  flag,
-		CommandId: cmd,
+		CommandId: cmdID,
 		LocaleId:  locale,
 	}
 }
 
 func (s *Session) sendHeartbreak(conn net.Conn) error {
 	head, _ := proto.Marshal(&pb.ReqDataHighwayHead{
-		MsgBasehead: &pb.DataHighwayHead{
-			Version:   1,
-			Uin:       s.Uin,
-			Command:   "PicUp.Echo",
-			Seq:       s.nextSeq(),
-			Appid:     s.AppID,
-			Dataflag:  4096,
-			CommandId: 0,
-			LocaleId:  2052,
-		},
+		MsgBasehead: s.dataHighwayHead(_REQ_CMD_HEART_BREAK, 4096, 0, 2052),
 	})
-	frame := network.HeadBodyFrame(head, nil)
+	frame := newFrame(head, nil)
 	_, err := frame.WriteTo(conn)
 	return err
 }