diff --git a/go.mod b/go.mod
index 9caf0c8..03694ae 100644
--- a/go.mod
+++ b/go.mod
@@ -1,3 +1,5 @@
 module github.com/thinkgos/socks5
 
 go 1.14
+
+require golang.org/x/net v0.0.0-20200324143707-d3edc9973b7e
diff --git a/go.sum b/go.sum
index e69de29..9541a65 100644
--- a/go.sum
+++ b/go.sum
@@ -0,0 +1,6 @@
+golang.org/x/crypto v0.0.0-20190308221718-c2843e01d9a2/go.mod h1:djNgcEr1/C05ACkg1iLfiJU5Ep61QUkGW8qpdssI0+w=
+golang.org/x/net v0.0.0-20200324143707-d3edc9973b7e h1:3G+cUijn7XD+S4eJFddp53Pv7+slrESplyjG25HgL+k=
+golang.org/x/net v0.0.0-20200324143707-d3edc9973b7e/go.mod h1:qpuaurCH72eLCgpAm/N6yyVIVM9cpaDIP3A8BGJEC5A=
+golang.org/x/sys v0.0.0-20190215142949-d0b11bdaac8a/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
+golang.org/x/sys v0.0.0-20200323222414-85ca7c5b95cd/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
+golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
diff --git a/socks5_test.go b/socks5_test.go
index 5939514..945032d 100644
--- a/socks5_test.go
+++ b/socks5_test.go
@@ -8,6 +8,8 @@ import (
 	"os"
 	"testing"
 	"time"
+
+	"golang.org/x/net/proxy"
 )
 
 func TestSOCKS5_Connect(t *testing.T) {
@@ -232,3 +234,72 @@ func TestSOCKS5_Associate(t *testing.T) {
 	}
 	time.Sleep(time.Second * 1)
 }
+
+func Test_SocksWithProxy(t *testing.T) {
+	// Create a local listener
+	l, err := net.Listen("tcp", "127.0.0.1:0")
+	if err != nil {
+		t.Fatalf("err: %v", err)
+	}
+	go func() {
+		conn, err := l.Accept()
+		if err != nil {
+			t.Fatalf("err: %v", err)
+		}
+		defer conn.Close()
+
+		buf := make([]byte, 4)
+		if _, err := io.ReadAtLeast(conn, buf, 4); err != nil {
+			t.Fatalf("err: %v", err)
+		}
+
+		if !bytes.Equal(buf, []byte("ping")) {
+			t.Fatalf("bad: %v", buf)
+		}
+		conn.Write([]byte("pong"))
+	}()
+	lAddr := l.Addr().(*net.TCPAddr)
+
+	// Create a socks server
+	cator := UserPassAuthenticator{Credentials: StaticCredentials{"foo": "bar"}}
+	conf := &Config{
+		AuthMethods: []Authenticator{cator},
+		Logger:      NewLogger(log.New(os.Stdout, "socks5: ", log.LstdFlags)),
+	}
+	serv, err := New(conf)
+	if err != nil {
+		t.Fatalf("err: %v", err)
+	}
+
+	// Start listening
+	go func() {
+		if err := serv.ListenAndServe("tcp", "127.0.0.1:12395"); err != nil {
+			t.Fatalf("err: %v", err)
+		}
+	}()
+	time.Sleep(10 * time.Millisecond)
+
+	dial, err := proxy.SOCKS5("tcp", "127.0.0.1:12395", &proxy.Auth{"foo", "bar"}, proxy.Direct)
+	if err != nil {
+		t.Fatalf("err: %v", err)
+	}
+
+	// Connect, auth and connect to local
+	conn, err := dial.Dial("tcp", lAddr.String())
+	if err != nil {
+		t.Fatalf("err: %v", err)
+	}
+
+	// Send a ping
+	conn.Write([]byte("ping"))
+
+	out := make([]byte, 4)
+	conn.SetDeadline(time.Now().Add(time.Second))
+	if _, err := io.ReadFull(conn, out); err != nil {
+		t.Fatalf("err: %v", err)
+	}
+
+	if !bytes.Equal(out, []byte("pong")) {
+		t.Fatalf("bad: %v", out)
+	}
+}