diff --git a/go/cmd/nekobox_core/core_box.go b/go/cmd/nekobox_core/core_box.go
index 4a82e86..2d33109 100644
--- a/go/cmd/nekobox_core/core_box.go
+++ b/go/cmd/nekobox_core/core_box.go
@@ -2,21 +2,13 @@ package main
 
 import (
 	"context"
-	"io"
-	"net"
 	"net/http"
-	"reflect"
-	"time"
-	"unsafe"
 
 	"github.com/matsuridayo/libneko/neko_common"
 	"github.com/matsuridayo/libneko/neko_log"
+	"github.com/matsuridayo/sing-box-extra/boxapi"
 
 	box "github.com/sagernet/sing-box"
-	"github.com/sagernet/sing-box/adapter"
-	"github.com/sagernet/sing-box/common/dialer"
-	"github.com/sagernet/sing/common/metadata"
-	"github.com/sagernet/sing/common/network"
 )
 
 var instance *box.Box
@@ -28,54 +20,6 @@ func setupCore() {
 	neko_log.SetupLog(50*1024, "./neko.log")
 	//
 	neko_common.GetProxyHttpClient = func() *http.Client {
-		return getProxyHttpClient(instance)
+		return boxapi.GetProxyHttpClient(instance)
 	}
 }
-
-func getProxyHttpClient(box *box.Box) *http.Client {
-	var d network.Dialer
-
-	if box != nil {
-		router_ := reflect.Indirect(reflect.ValueOf(box)).FieldByName("router")
-		router_ = reflect.NewAt(router_.Type(), unsafe.Pointer(router_.UnsafeAddr())).Elem()
-		if router, ok := router_.Interface().(adapter.Router); ok {
-			d = dialer.NewRouter(router)
-		}
-	}
-
-	dialContext := func(ctx context.Context, network, addr string) (net.Conn, error) {
-		return d.DialContext(ctx, network, metadata.ParseSocksaddr(addr))
-	}
-
-	transport := &http.Transport{
-		TLSHandshakeTimeout:   time.Second * 3,
-		ResponseHeaderTimeout: time.Second * 3,
-	}
-
-	if d != nil {
-		transport.DialContext = dialContext
-	}
-
-	client := &http.Client{
-		Transport: transport,
-	}
-
-	return client
-}
-
-type logWriter struct {
-	files []io.Writer
-}
-
-func (w *logWriter) Write(p []byte) (n int, err error) {
-	for _, file := range w.files {
-		if file == nil {
-			continue
-		}
-		n, err = file.Write(p)
-		if err != nil {
-			return
-		}
-	}
-	return
-}
diff --git a/go/cmd/nekobox_core/go.mod b/go/cmd/nekobox_core/go.mod
index afb15e7..7e20990 100644
--- a/go/cmd/nekobox_core/go.mod
+++ b/go/cmd/nekobox_core/go.mod
@@ -3,9 +3,8 @@ module nekobox_core
 go 1.19
 
 require (
-	github.com/matsuridayo/libneko v0.0.0-20230304130313-5ea96b79b3c3
-	github.com/matsuridayo/sing-box-extra v0.0.0-20230304131029-37eeda33b862
-	github.com/sagernet/sing v0.1.8-0.20230301160041-9fab0a9f4304
+	github.com/matsuridayo/libneko v0.0.0-20230305030237-4aefab71d5b4
+	github.com/matsuridayo/sing-box-extra v0.0.0-20230305030339-e94f0e97ef0c
 	github.com/sagernet/sing-box v1.1.6-0.20230301163156-e8802357e1e7
 	grpc_server v1.0.0
 )
@@ -55,6 +54,7 @@ require (
 	github.com/sagernet/netlink v0.0.0-20220905062125-8043b4a9aa97 // indirect
 	github.com/sagernet/quic-go v0.0.0-20230202071646-a8c8afb18b32 // indirect
 	github.com/sagernet/reality v0.0.0-20230228045158-d3e085a8e5d1 // indirect
+	github.com/sagernet/sing v0.1.8-0.20230301160041-9fab0a9f4304 // indirect
 	github.com/sagernet/sing-dns v0.1.4 // indirect
 	github.com/sagernet/sing-shadowsocks v0.1.2-0.20230221080503-769c01d6bba9 // indirect
 	github.com/sagernet/sing-shadowtls v0.0.0-20230221123345-78e50cd7b587 // indirect
diff --git a/go/cmd/nekobox_core/go.sum b/go/cmd/nekobox_core/go.sum
index 0581138..fd05812 100644
--- a/go/cmd/nekobox_core/go.sum
+++ b/go/cmd/nekobox_core/go.sum
@@ -105,10 +105,10 @@ github.com/libdns/libdns v0.2.1 h1:Wu59T7wSHRgtA0cfxC+n1c/e+O3upJGWytknkmFEDis=
 github.com/libdns/libdns v0.2.1/go.mod h1:yQCXzk1lEZmmCPa857bnk4TsOiqYasqpyOEeSObbb40=
 github.com/logrusorgru/aurora v2.0.3+incompatible h1:tOpm7WcpBTn4fjmVfgpQq0EfczGlG91VSDkswnjF5A8=
 github.com/logrusorgru/aurora v2.0.3+incompatible/go.mod h1:7rIyQOR62GCctdiQpZ/zOJlFyk6y+94wXzv6RNZgaR4=
-github.com/matsuridayo/libneko v0.0.0-20230304130313-5ea96b79b3c3 h1:emqnGHIlezKjm24Lz5aos9Lc1bhxFL8Ynp20EprSNJc=
-github.com/matsuridayo/libneko v0.0.0-20230304130313-5ea96b79b3c3/go.mod h1:IRO07Queptz/rGFvEW+3Hmwpx7MCup6WiDs4p5jMt4g=
-github.com/matsuridayo/sing-box-extra v0.0.0-20230304131029-37eeda33b862 h1:z8qC1cSVDZrhJbZPgsp1oM8rxnzMb+aU3FxAYG27S+k=
-github.com/matsuridayo/sing-box-extra v0.0.0-20230304131029-37eeda33b862/go.mod h1:5YMikmz+Vpr5P7/rSigF92Yf5pBsCzDq9IpQRjoLb3E=
+github.com/matsuridayo/libneko v0.0.0-20230305030237-4aefab71d5b4 h1:+QFcvCMntMTIG1NQABy7P4Pw7mPqdbPcYnIBswRik1s=
+github.com/matsuridayo/libneko v0.0.0-20230305030237-4aefab71d5b4/go.mod h1:IRO07Queptz/rGFvEW+3Hmwpx7MCup6WiDs4p5jMt4g=
+github.com/matsuridayo/sing-box-extra v0.0.0-20230305030339-e94f0e97ef0c h1:cPzKBlzhtwQkW9Vtb4MVCXpAO/UDQGyx+cjatJlXLuc=
+github.com/matsuridayo/sing-box-extra v0.0.0-20230305030339-e94f0e97ef0c/go.mod h1:xZckt28e8/yrsXbh9UXS+QBn3qe6DSXwmzm+0LwzLz4=
 github.com/mdlayher/ethernet v0.0.0-20190606142754-0394541c37b7/go.mod h1:U6ZQobyTjI/tJyq2HG+i/dfSoFUt8/aZCM+GKtmFk/Y=
 github.com/mdlayher/netlink v0.0.0-20190409211403-11939a169225/go.mod h1:eQB3mZE4aiYnlUsyGGCOpPETfdQq4Jhsgf1fk3cwQaA=
 github.com/mdlayher/netlink v1.0.0/go.mod h1:KxeJAFOFLG6AjpyDkQ/iIhxygIUKD+vcwqcnu43w/+M=
diff --git a/go/cmd/nekobox_core/grpc_box.go b/go/cmd/nekobox_core/grpc_box.go
index 7d5a402..02ffcf7 100644
--- a/go/cmd/nekobox_core/grpc_box.go
+++ b/go/cmd/nekobox_core/grpc_box.go
@@ -130,7 +130,7 @@ func (s *server) Test(ctx context.Context, in *gen.TestReq) (out *gen.TestResp,
 			}
 		}
 		// Latency
-		out.Ms, err = speedtest.UrlTest(getProxyHttpClient(i), in.Url, in.Timeout)
+		out.Ms, err = speedtest.UrlTest(boxapi.GetProxyHttpClient(i), in.Url, in.Timeout)
 	} else if in.Mode == gen.TestMode_TcpPing {
 		out.Ms, err = speedtest.TcpPing(in.Address, in.Timeout)
 	} else {