diff --git a/dns.go b/dns.go
deleted file mode 100644
index 48649b9..0000000
--- a/dns.go
+++ /dev/null
@@ -1,157 +0,0 @@
-package main
-
-import (
-	"context"
-	"crypto/tls"
-	"errors"
-	"net"
-	"sync"
-	"time"
-
-	"github.com/fumiama/terasu"
-)
-
-var (
-	ErrNoDNSAvailable = errors.New("no dns available")
-)
-
-var dnsdialer = net.Dialer{
-	Timeout: time.Second * 8,
-}
-
-type dnsstat struct {
-	A string
-	E bool
-}
-
-type dnsservers struct {
-	sync.RWMutex
-	m map[string][]*dnsstat
-}
-
-// hasrecord no lock, use under lock
-func hasrecord(lst []*dnsstat, a string) bool {
-	for _, addr := range lst {
-		if addr.A == a {
-			return true
-		}
-	}
-	return false
-}
-
-func (ds *dnsservers) add(m map[string][]string) {
-	ds.Lock()
-	defer ds.Unlock()
-	addList := map[string][]*dnsstat{}
-	for host, addrs := range m {
-		for _, addr := range addrs {
-			if !hasrecord(ds.m[host], addr) && !hasrecord(addList[host], addr) {
-				addList[host] = append(addList[host], &dnsstat{addr, true})
-			}
-		}
-	}
-	for host, addrs := range addList {
-		ds.m[host] = append(ds.m[host], addrs...)
-	}
-}
-
-func (ds *dnsservers) dial(ctx context.Context) (tlsConn *tls.Conn, err error) {
-	err = ErrNoDNSAvailable
-
-	ds.RLock()
-	defer ds.RUnlock()
-
-	if dnsdialer.Timeout != 0 {
-		var cancel context.CancelFunc
-		ctx, cancel = context.WithTimeout(ctx, dnsdialer.Timeout)
-		defer cancel()
-	}
-
-	if !dnsdialer.Deadline.IsZero() {
-		var cancel context.CancelFunc
-		ctx, cancel = context.WithDeadline(ctx, dnsdialer.Deadline)
-		defer cancel()
-	}
-
-	var conn net.Conn
-	for host, addrs := range ds.m {
-		for _, addr := range addrs {
-			if !addr.E {
-				continue
-			}
-			conn, err = dnsdialer.DialContext(ctx, "tcp", addr.A)
-			if err != nil {
-				addr.E = false // no need to acquire write lock
-				continue
-			}
-			tlsConn = tls.Client(conn, &tls.Config{ServerName: host})
-			err = terasu.Use(tlsConn).HandshakeContext(ctx)
-			if err == nil {
-				return
-			}
-			_ = tlsConn.Close()
-			addr.E = false // no need to acquire write lock
-		}
-	}
-	return
-}
-
-var dotv6servers = dnsservers{
-	m: map[string][]*dnsstat{
-		"dot.sb": {
-			{"[2a09::]:853", true},
-			{"[2a11::]:853", true},
-		},
-		"dns.google": {
-			{"[2001:4860:4860::8888]:853", true},
-			{"[2001:4860:4860::8844]:853", true},
-		},
-		"cloudflare-dns.com": {
-			{"[2606:4700:4700::1111]:853", true},
-			{"[2606:4700:4700::1001]:853", true},
-		},
-		"dns.umbrella.com": {
-			{"[2620:0:ccc::2]:853", true},
-			{"[2620:0:ccd::2]:853", true},
-		},
-		"dns10.quad9.net": {
-			{"[2620:fe::10]:853", true},
-			{"[2620:fe::fe:10]:853", true},
-		},
-	},
-}
-
-var dotv4servers = dnsservers{
-	m: map[string][]*dnsstat{
-		"dot.sb": {
-			{"185.222.222.222:853", true},
-			{"45.11.45.11:853", true},
-		},
-		"dns.google": {
-			{"8.8.8.8:853", true},
-			{"8.8.4.4:853", true},
-		},
-		"cloudflare-dns.com": {
-			{"1.1.1.1:853", true},
-			{"1.0.0.1:853", true},
-		},
-		"dns.umbrella.com": {
-			{"208.67.222.222:853", true},
-			{"208.67.220.220:853", true},
-		},
-		"dns10.quad9.net": {
-			{"9.9.9.10:853", true},
-			{"149.112.112.10:853", true},
-		},
-	},
-}
-
-var resolver = &net.Resolver{
-	PreferGo: true,
-	Dial: func(ctx context.Context, _, _ string) (net.Conn, error) {
-		if canUseIPv6.Get() {
-			return dotv6servers.dial(ctx)
-		}
-		return dotv4servers.dial(ctx)
-	},
-}
diff --git a/dns_test.go b/dns_test.go
deleted file mode 100644
index 6fb3bb1..0000000
--- a/dns_test.go
+++ /dev/null
@@ -1,95 +0,0 @@
-package main
-
-import (
-	"context"
-	"crypto/tls"
-	"fmt"
-	"net"
-	"testing"
-	"time"
-
-	"github.com/fumiama/terasu"
-)
-
-func TestResolver(t *testing.T) {
-	t.Log("canUseIPv6:", canUseIPv6.Get())
-	addrs, err := resolver.LookupHost(context.TODO(), "api.mangacopy.com")
-	if err != nil {
-		t.Fatal(err)
-	}
-	t.Log(addrs)
-	if len(addrs) == 0 {
-		t.Fail()
-	}
-}
-
-func TestDNS(t *testing.T) {
-	if canUseIPv6.Get() {
-		dotv6servers.test()
-	}
-	dotv4servers.test()
-	for i := 0; i < 100; i++ {
-		addrs, err := resolver.LookupHost(context.TODO(), "api.mangacopy.com")
-		if err != nil {
-			t.Fatal(err)
-		}
-		t.Log(addrs)
-		if len(addrs) == 0 {
-			t.Fail()
-		}
-		time.Sleep(time.Millisecond * 50)
-	}
-}
-
-func TestBadDNS(t *testing.T) {
-	dotv6serversbak := dotv6servers.m
-	dotv4serversbak := dotv4servers.m
-	defer func() {
-		dotv6servers.m = dotv6serversbak
-		dotv4servers.m = dotv4serversbak
-	}()
-	if canUseIPv6.Get() {
-		dotv6servers = dnsservers{
-			m: map[string][]*dnsstat{},
-		}
-		dotv6servers.add(map[string][]string{"test.bad.host": {"169.254.122.111"}})
-	} else {
-		dotv4servers = dnsservers{
-			m: map[string][]*dnsstat{},
-		}
-		dotv4servers.add(map[string][]string{"test.bad.host": {"169.254.122.111:853"}})
-	}
-	for i := 0; i < 10; i++ {
-		addrs, err := resolver.LookupHost(context.TODO(), "api.mangacopy.com")
-		t.Log(err)
-		if err == nil && len(addrs) > 0 {
-			t.Fatal("unexpected")
-		}
-		time.Sleep(time.Millisecond * 50)
-	}
-}
-
-func (ds *dnsservers) test() {
-	ds.RLock()
-	defer ds.RUnlock()
-	for host, addrs := range ds.m {
-		for _, addr := range addrs {
-			if !addr.E {
-				continue
-			}
-			fmt.Println("dial:", host, addr.A)
-			conn, err := net.Dial("tcp", addr.A)
-			if err != nil {
-				continue
-			}
-			tlsConn := tls.Client(conn, &tls.Config{ServerName: host})
-			err = terasu.Use(tlsConn).Handshake()
-			_ = tlsConn.Close()
-			if err == nil {
-				fmt.Println("succ:", host, addr.A)
-				continue
-			}
-			fmt.Println("fail:", host, addr.A)
-		}
-	}
-}
diff --git a/go.mod b/go.mod
index 3f20114..2858593 100644
--- a/go.mod
+++ b/go.mod
@@ -2,11 +2,11 @@ module comandy
 
 go 1.22.1
 
-require (
-	github.com/FloatTech/ttl v0.0.0-20230307105452-d6f7b2b647d1
-	github.com/RomiChan/syncx v0.0.0-20221202055724-5f842c53020e
-	github.com/fumiama/terasu v0.0.0-20240416061047-62d3c9f6be80
-	golang.org/x/net v0.24.0
-)
+require github.com/fumiama/terasu v0.0.0-20240418151245-719e0c16831b
 
-require golang.org/x/text v0.14.0 // indirect
+require (
+	github.com/FloatTech/ttl v0.0.0-20230307105452-d6f7b2b647d1 // indirect
+	github.com/RomiChan/syncx v0.0.0-20240418144900-b7402ffdebc7 // indirect
+	golang.org/x/net v0.24.0 // indirect
+	golang.org/x/text v0.14.0 // indirect
+)
diff --git a/go.sum b/go.sum
index 56ab9bd..11cd8a2 100644
--- a/go.sum
+++ b/go.sum
@@ -1,11 +1,11 @@
 github.com/FloatTech/ttl v0.0.0-20230307105452-d6f7b2b647d1 h1:g4pTnDJUW4VbJ9NvoRfUvdjDrHz/6QhfN/LoIIpICbo=
 github.com/FloatTech/ttl v0.0.0-20230307105452-d6f7b2b647d1/go.mod h1:fHZFWGquNXuHttu9dUYoKuNbm3dzLETnIOnm1muSfDs=
-github.com/RomiChan/syncx v0.0.0-20221202055724-5f842c53020e h1:wR3MXQ3VbUlPKOOUwLOYgh/QaJThBTYtsl673O3lqSA=
-github.com/RomiChan/syncx v0.0.0-20221202055724-5f842c53020e/go.mod h1:vD7Ra3Q9onRtojoY5sMCLQ7JBgjUsrXDnDKyFxqpf9w=
+github.com/RomiChan/syncx v0.0.0-20240418144900-b7402ffdebc7 h1:S/ferNiehVjNaBMNNBxUjLtVmP/YWD6Yh79RfPv4ehU=
+github.com/RomiChan/syncx v0.0.0-20240418144900-b7402ffdebc7/go.mod h1:vD7Ra3Q9onRtojoY5sMCLQ7JBgjUsrXDnDKyFxqpf9w=
 github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
 github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
-github.com/fumiama/terasu v0.0.0-20240416061047-62d3c9f6be80 h1:O1JJZzcd5ggUw/9X8V9KxBZ9JZGWFmX/r1q2TPg+pZQ=
-github.com/fumiama/terasu v0.0.0-20240416061047-62d3c9f6be80/go.mod h1:BFl0X1+rGJf8bLHl/kO+v05ryHrj/R4kyCrK89NvegA=
+github.com/fumiama/terasu v0.0.0-20240418151245-719e0c16831b h1:j6DMJg+jd4HPmhQtVwtiHBM1y9XskJgWhskUvWuhFuY=
+github.com/fumiama/terasu v0.0.0-20240418151245-719e0c16831b/go.mod h1:afchyfKAb7J/zvaENtYzjIEPVbwiEjJaow05zzT4usM=
 github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
 github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
 github.com/stretchr/testify v1.8.0 h1:pSgiaMZlXftHpm5L7V1+rVB+AZJydKsMxsQBIJw4PKk=
diff --git a/http.go b/http.go
index acc9516..95b250a 100644
--- a/http.go
+++ b/http.go
@@ -1,93 +1,17 @@
 package main
 
 import (
-	"context"
-	"crypto/tls"
 	"encoding/base64"
 	"encoding/json"
-	"errors"
 	"fmt"
 	"io"
-	"net"
 	"net/http"
 	"reflect"
 	"strings"
-	"sync"
-	"time"
 
-	"github.com/FloatTech/ttl"
-	"github.com/fumiama/terasu"
-	"golang.org/x/net/http2"
+	"github.com/fumiama/terasu/http2"
 )
 
-var (
-	ErrEmptyHostAddress = errors.New("empty host addr")
-)
-
-var httpdialer = net.Dialer{
-	Timeout: time.Minute,
-}
-
-var lookupTable = ttl.NewCache[string, []string](time.Hour)
-
-type comandyClient http.Client
-
-var cli = comandyClient(http.Client{
-	Transport: &http2.Transport{
-		DialTLSContext: func(ctx context.Context, network, addr string, cfg *tls.Config) (net.Conn, error) {
-			if httpdialer.Timeout != 0 {
-				var cancel context.CancelFunc
-				ctx, cancel = context.WithTimeout(ctx, httpdialer.Timeout)
-				defer cancel()
-			}
-
-			if !httpdialer.Deadline.IsZero() {
-				var cancel context.CancelFunc
-				ctx, cancel = context.WithDeadline(ctx, httpdialer.Deadline)
-				defer cancel()
-			}
-
-			host, port, err := net.SplitHostPort(addr)
-			if err != nil {
-				return nil, err
-			}
-			addrs := lookupTable.Get(host)
-			if len(addrs) == 0 {
-				addrs, err = resolver.LookupHost(ctx, host)
-				if err != nil {
-					addrs, err = net.DefaultResolver.LookupHost(ctx, host)
-					if err != nil {
-						return nil, err
-					}
-				}
-				lookupTable.Set(host, addrs)
-			}
-			if len(addr) == 0 {
-				return nil, ErrEmptyHostAddress
-			}
-			var tlsConn *tls.Conn
-			for _, a := range addrs {
-				if strings.Contains(a, ":") {
-					a = "[" + a + "]:" + port
-				} else {
-					a += ":" + port
-				}
-				conn, err := httpdialer.DialContext(ctx, network, a)
-				if err != nil {
-					continue
-				}
-				tlsConn = tls.Client(conn, cfg)
-				err = terasu.Use(tlsConn).HandshakeContext(ctx)
-				if err == nil {
-					break
-				}
-				_ = tlsConn.Close()
-			}
-			return tlsConn, err
-		},
-	},
-})
-
 type capsule struct {
 	C int            `json:"code,omitempty"`
 	M string         `json:"method,omitempty"`
@@ -112,7 +36,7 @@ func (r *capsule) printstrerr(err string) string {
 	return buf.String()
 }
 
-func (cli *comandyClient) request(para string) (ret string) {
+func gorequest(para string) (ret string) {
 	r := capsule{}
 	defer func() {
 		err := recover()
@@ -120,12 +44,6 @@ func (cli *comandyClient) request(para string) (ret string) {
 			ret = r.printstrerr(fmt.Sprint())
 		}
 	}()
-	wg := sync.WaitGroup{}
-	wg.Add(1)
-	go func() {
-		defer wg.Done()
-		_ = canUseIPv6.Get()
-	}()
 	err := json.Unmarshal(stringToBytes(para), &r)
 	if err != nil {
 		return r.printerr(err)
@@ -160,8 +78,7 @@ func (cli *comandyClient) request(para string) (ret string) {
 			return r.printstrerr("unsupported H type " + reflect.ValueOf(x).Type().Name())
 		}
 	}
-	wg.Wait()
-	resp, err := (*http.Client)(cli).Do(req)
+	resp, err := http2.DefaultClient.Do(req)
 	if err != nil {
 		return r.printerr(err)
 	}
diff --git a/http_test.go b/http_test.go
index 1e93856..5663d8e 100644
--- a/http_test.go
+++ b/http_test.go
@@ -3,41 +3,12 @@ package main
 import (
 	"encoding/base64"
 	"encoding/json"
-	"io"
 	"net/http"
 	"testing"
 )
 
-func TestClientGet(t *testing.T) {
-	_ = canUseIPv6.Get()
-	req, err := http.NewRequest("GET", "https://api.mangacopy.com/api/v3/h5/homeIndex?platform=3", nil)
-	if err != nil {
-		t.Fatal(err)
-	}
-	req.Header.Add("user-agent", "COPY/2.1.7")
-	resp, err := (*http.Client)(&cli).Do(req)
-	if err != nil {
-		t.Fatal(err)
-	}
-	defer resp.Body.Close()
-	t.Log("[T] response code", resp.StatusCode)
-	for k, vs := range resp.Header {
-		for _, v := range vs {
-			t.Log("[T] response header", k+":", v)
-		}
-	}
-	data, err := io.ReadAll(resp.Body)
-	if err != nil {
-		t.Fatal(err)
-	}
-	if len(data) == 0 {
-		t.Fail()
-	}
-	t.Log(bytesToString(data))
-}
-
 func TestRequest(t *testing.T) {
-	r := cli.request(`{"code":0,"headers":{"authorization":"Token ","host":"api.mangacopy.com","source":"copyApp","webp":"1","region":"1","version":"2.1.7","platform":"3","user-agent":"COPY/2.1.7"},"method":"GET","url":"https://api.mangacopy.com/api/v3/h5/homeIndex?platform\u003d3"}`)
+	r := gorequest(`{"code":0,"headers":{"authorization":"Token ","host":"api.mangacopy.com","source":"copyApp","webp":"1","region":"1","version":"2.1.7","platform":"3","user-agent":"COPY/2.1.7"},"method":"GET","url":"https://api.mangacopy.com/api/v3/h5/homeIndex?platform\u003d3"}`)
 	t.Log(r)
 	c := capsule{}
 	err := json.Unmarshal(stringToBytes(r), &c)
diff --git a/ipv6.go b/ipv6.go
deleted file mode 100644
index bb4b649..0000000
--- a/ipv6.go
+++ /dev/null
@@ -1,24 +0,0 @@
-package main
-
-import (
-	"context"
-	"net/http"
-	"time"
-
-	"github.com/RomiChan/syncx"
-)
-
-var canUseIPv6 = syncx.Lazy[bool]{Init: func() bool {
-	ctx, cancel := context.WithTimeout(context.Background(), 4*time.Second)
-	defer cancel()
-	req, err := http.NewRequestWithContext(ctx, "GET", "http://v6.ipv6-test.com/json/widgetdata.php?callback=?", nil)
-	if err != nil {
-		return false
-	}
-	resp, err := http.DefaultClient.Do(req)
-	if err != nil {
-		return false
-	}
-	_ = resp.Body.Close()
-	return true
-}}
diff --git a/main.go b/main.go
index 0d27e8b..356f9b3 100644
--- a/main.go
+++ b/main.go
@@ -4,6 +4,9 @@ import "C"
 
 import (
 	"encoding/json"
+
+	"github.com/fumiama/terasu/dns"
+	"github.com/fumiama/terasu/ip"
 )
 
 func main() {}
@@ -18,13 +21,13 @@ func add_dns(para *C.char, is_ipv6 C.int) *C.char {
 		return C.CString(err.Error())
 	}
 	if is_ipv6 != 0 {
-		if !canUseIPv6.Get() {
+		if !ip.IsIPv6Available.Get() {
 			return C.CString("cannot use ipv6")
 		}
-		dotv6servers.add(m)
+		dns.IPv6Servers.Add(m)
 		return nil
 	}
-	dotv4servers.add(m)
+	dns.IPv4Servers.Add(m)
 	return nil
 }
 
@@ -40,5 +43,5 @@ func add_dns(para *C.char, is_ipv6 C.int) *C.char {
 //
 //export request
 func request(para *C.char) *C.char {
-	return C.CString(cli.request(C.GoString(para)))
+	return C.CString(gorequest(C.GoString(para)))
 }
diff --git a/utils.go b/utils.go
index d898d1d..edf0da1 100644
--- a/utils.go
+++ b/utils.go
@@ -14,10 +14,12 @@ type slice struct {
 	cap  int
 }
 
+/*
 // bytesToString 没有内存开销的转换
 func bytesToString(b []byte) string {
 	return *(*string)(unsafe.Pointer(&b))
 }
+*/
 
 // stringToBytes 没有内存开销的转换
 func stringToBytes(s string) (b []byte) {