diff --git a/binary/reader.go b/binary/reader.go
index 2e5a6602..6a616930 100644
--- a/binary/reader.go
+++ b/binary/reader.go
@@ -34,9 +34,11 @@ func (r *Reader) ReadByte() byte {
 
 func (r *Reader) ReadBytes(len int) []byte {
 	b := make([]byte, len)
-	_, err := r.buf.Read(b)
-	if err != nil {
-		panic(err)
+	if len > 0 {
+		_, err := r.buf.Read(b)
+		if err != nil {
+			panic(err)
+		}
 	}
 	return b
 }
diff --git a/client/client.go b/client/client.go
index 4bd9342f..974e1a9b 100644
--- a/client/client.go
+++ b/client/client.go
@@ -5,14 +5,6 @@ import (
 	"encoding/hex"
 	"errors"
 	"fmt"
-	"github.com/Mrs4s/MiraiGo/binary"
-	"github.com/Mrs4s/MiraiGo/client/pb/longmsg"
-	"github.com/Mrs4s/MiraiGo/client/pb/msg"
-	"github.com/Mrs4s/MiraiGo/client/pb/multimsg"
-	"github.com/Mrs4s/MiraiGo/message"
-	"github.com/Mrs4s/MiraiGo/protocol/packets"
-	"github.com/Mrs4s/MiraiGo/utils"
-	"github.com/golang/protobuf/proto"
 	"io"
 	"log"
 	"math"
@@ -21,6 +13,15 @@ import (
 	"sync"
 	"sync/atomic"
 	"time"
+
+	"github.com/Mrs4s/MiraiGo/binary"
+	"github.com/Mrs4s/MiraiGo/client/pb/longmsg"
+	"github.com/Mrs4s/MiraiGo/client/pb/msg"
+	"github.com/Mrs4s/MiraiGo/client/pb/multimsg"
+	"github.com/Mrs4s/MiraiGo/message"
+	"github.com/Mrs4s/MiraiGo/protocol/packets"
+	"github.com/Mrs4s/MiraiGo/utils"
+	"github.com/golang/protobuf/proto"
 )
 
 type QQClient struct {
@@ -84,6 +85,9 @@ type loginSigInfo struct {
 	d2Key              []byte
 	wtSessionTicketKey []byte
 	deviceToken        []byte
+
+	psKeyMap    map[string][]byte
+	pt4TokenMap map[string][]byte
 }
 
 func init() {
@@ -656,6 +660,28 @@ func (g *GroupInfo) FindMember(uin int64) *GroupMemberInfo {
 	return nil
 }
 
+func (c *QQClient) getCookies() string {
+	return fmt.Sprintf("uin=o%d; skey=%s;", c.Uin, c.sigInfo.sKey)
+}
+
+func (c *QQClient) getCookiesWithDomain(domain string) string {
+	cookie := c.getCookies()
+
+	if psKey, ok := c.sigInfo.psKeyMap[domain]; ok {
+		return fmt.Sprintf("%s p_uin=o%d; p_skey=%s;", cookie, c.Uin, psKey)
+	} else {
+		return cookie
+	}
+}
+
+func (c *QQClient) getCSRFToken() int {
+	accu := 5381
+	for _, b := range c.sigInfo.sKey {
+		accu = accu + (accu << 5) + int(b)
+	}
+	return 2147483647 & accu
+}
+
 func (c *QQClient) editMemberCard(groupCode, memberUin int64, card string) {
 	_, _ = c.sendAndWait(c.buildEditGroupTagPacket(groupCode, memberUin, card))
 }
diff --git a/client/tlv_decoders.go b/client/tlv_decoders.go
index 264cc58b..1671af56 100644
--- a/client/tlv_decoders.go
+++ b/client/tlv_decoders.go
@@ -2,8 +2,9 @@ package client
 
 import (
 	"fmt"
-	"github.com/Mrs4s/MiraiGo/binary"
 	"time"
+
+	"github.com/Mrs4s/MiraiGo/binary"
 )
 
 // --- tlv decoders for qq client ---
@@ -52,6 +53,8 @@ func (c *QQClient) decodeT119(data []byte) {
 		//noPicSig []byte
 		//ctime           = time.Now().Unix()
 		//etime           = ctime + 2160000
+		psKeyMap    map[string][]byte
+		pt4TokenMap map[string][]byte
 	)
 
 	if _, ok := m[0x125]; ok {
@@ -69,9 +72,9 @@ func (c *QQClient) decodeT119(data []byte) {
 	if _, ok := m[0x200]; ok {
 		//pf, pfkey = readT200(t200)
 	}
-	if _, ok := m[0x512]; ok {
-
-	} // 暂不处理, Http api cookie
+	if t512, ok := m[0x512]; ok {
+		psKeyMap, pt4TokenMap = readT512(t512)
+	}
 	if _, ok := m[0x531]; ok {
 		//a1, noPicSig = readT531(t531)
 	}
@@ -87,6 +90,9 @@ func (c *QQClient) decodeT119(data []byte) {
 		d2Key:              m[0x305],
 		wtSessionTicketKey: m[0x134],
 		deviceToken:        m[0x322],
+
+		psKeyMap:    psKeyMap,
+		pt4TokenMap: pt4TokenMap,
 	}
 	c.Nickname = nick
 	c.Age = age
@@ -142,6 +148,30 @@ func readT200(data []byte) (pf, pfKey []byte) {
 	return
 }
 
+func readT512(data []byte) (psKeyMap map[string][]byte, pt4TokenMap map[string][]byte) {
+	reader := binary.NewReader(data)
+	length := int(reader.ReadUInt16())
+
+	psKeyMap = make(map[string][]byte, length)
+	pt4TokenMap = make(map[string][]byte, length)
+
+	for i := 0; i < length; i++ {
+		domain := reader.ReadStringShort()
+		psKey := reader.ReadBytesShort()
+		pt4Token := reader.ReadBytesShort()
+
+		if len(psKey) > 0 {
+			psKeyMap[domain] = psKey
+		}
+
+		if len(pt4Token) > 0 {
+			pt4TokenMap[domain] = pt4Token
+		}
+	}
+
+	return
+}
+
 func readT531(data []byte) (a1, noPicSig []byte) {
 	reader := binary.NewReader(data)
 	m := reader.ReadTlvMap(2)