diff --git a/.travis.yml b/.travis.yml
index 15fc6d5..6a64f07 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,5 +1,5 @@
 language: go
 
 go:
-  - "1.12.x"
+  - "1.13.x"
   - master
diff --git a/config/dnsrecord.inc.conf.example.txt b/config/dnsrecord.inc.conf.example
similarity index 100%
rename from config/dnsrecord.inc.conf.example.txt
rename to config/dnsrecord.inc.conf.example
diff --git a/config/rules.d/reject.rule.example b/config/rules.d/reject.rule.example
index 07e1411..8c47b4b 100644
--- a/config/rules.d/reject.rule.example
+++ b/config/rules.d/reject.rule.example
@@ -4,4 +4,4 @@ forward=reject://
 ipset=glider
 
 domain=pornhub.com
-domain=amazon.com
\ No newline at end of file
+domain=amazon.com
diff --git a/go.mod b/go.mod
index b3593ad..e68a88b 100644
--- a/go.mod
+++ b/go.mod
@@ -1,6 +1,6 @@
 module github.com/nadoo/glider
 
-go 1.12
+go 1.13
 
 require (
 	github.com/Yawning/chacha20 v0.0.0-20170904085104-e3b1f968fc63 // indirect
@@ -9,8 +9,8 @@ require (
 	github.com/dgryski/go-idea v0.0.0-20170306091226-d2fb45a411fb // indirect
 	github.com/dgryski/go-rc2 v0.0.0-20150621095337-8a9021637152 // indirect
 	github.com/ebfe/rc2 v0.0.0-20131011165748-24b9757f5521 // indirect
-	github.com/klauspost/cpuid v1.2.0 // indirect
-	github.com/klauspost/reedsolomon v1.9.1 // indirect
+	github.com/klauspost/cpuid v1.2.1 // indirect
+	github.com/klauspost/reedsolomon v1.9.2 // indirect
 	github.com/nadoo/conflag v0.2.0
 	github.com/nadoo/go-shadowsocks2 v0.1.0
 	github.com/pkg/errors v0.8.1 // indirect
@@ -18,10 +18,11 @@ require (
 	github.com/templexxx/cpufeat v0.0.0-20180724012125-cef66df7f161 // indirect
 	github.com/templexxx/xor v0.0.0-20181023030647-4e92f724b73b // indirect
 	github.com/tjfoc/gmsm v1.0.1 // indirect
-	github.com/xtaci/kcp-go v5.0.7+incompatible
-	golang.org/x/crypto v0.0.0-20190320223903-b7391e95e576
-	golang.org/x/net v0.0.0-20190320064053-1272bf9dcd53 // indirect
-	golang.org/x/sys v0.0.0-20190321052220-f7bb7a8bee54 // indirect
+	github.com/xtaci/kcp-go v5.4.4+incompatible
+	github.com/xtaci/lossyconn v0.0.0-20190602105132-8df528c0c9ae // indirect
+	golang.org/x/crypto v0.0.0-20190820162420-60c769a6c586
+	golang.org/x/net v0.0.0-20190813141303-74dc4d7220e7 // indirect
+	golang.org/x/sys v0.0.0-20190813064441-fde4db37ae7a // indirect
 )
 
 // Replace dependency modules with local developing copy
diff --git a/go.sum b/go.sum
index 0c7105a..0b80609 100644
--- a/go.sum
+++ b/go.sum
@@ -10,10 +10,10 @@ github.com/dgryski/go-rc2 v0.0.0-20150621095337-8a9021637152 h1:ED31mPIxDJnrLt9W
 github.com/dgryski/go-rc2 v0.0.0-20150621095337-8a9021637152/go.mod h1:I9fhc/EvSg88cDxmfQ47v35Ssz9rlFunL/KY0A1JAYI=
 github.com/ebfe/rc2 v0.0.0-20131011165748-24b9757f5521 h1:fBHFH+Y/GPGFGo7LIrErQc3p2MeAhoIQNgaxPWYsSxk=
 github.com/ebfe/rc2 v0.0.0-20131011165748-24b9757f5521/go.mod h1:ucvhdsUCE3TH0LoLRb6ShHiJl8e39dGlx6A4g/ujlow=
-github.com/klauspost/cpuid v1.2.0 h1:NMpwD2G9JSFOE1/TJjGSo5zG7Yb2bTe7eq1jH+irmeE=
-github.com/klauspost/cpuid v1.2.0/go.mod h1:Pj4uuM528wm8OyEC2QMXAi2YiTZ96dNQPGgoMS4s3ek=
-github.com/klauspost/reedsolomon v1.9.1 h1:kYrT1MlR4JH6PqOpC+okdb9CDTcwEC/BqpzK4WFyXL8=
-github.com/klauspost/reedsolomon v1.9.1/go.mod h1:CwCi+NUr9pqSVktrkN+Ondf06rkhYZ/pcNv7fu+8Un4=
+github.com/klauspost/cpuid v1.2.1 h1:vJi+O/nMdFt0vqm8NZBI6wzALWdA2X+egi0ogNyrC/w=
+github.com/klauspost/cpuid v1.2.1/go.mod h1:Pj4uuM528wm8OyEC2QMXAi2YiTZ96dNQPGgoMS4s3ek=
+github.com/klauspost/reedsolomon v1.9.2 h1:E9CMS2Pqbv+C7tsrYad4YC9MfhnMVWhMRsTi7U0UB18=
+github.com/klauspost/reedsolomon v1.9.2/go.mod h1:CwCi+NUr9pqSVktrkN+Ondf06rkhYZ/pcNv7fu+8Un4=
 github.com/nadoo/conflag v0.2.0 h1:xao13tYqfD+5bjQ1A/jT2kBL8tUcVpFhq3seuN5kpeM=
 github.com/nadoo/conflag v0.2.0/go.mod h1:Ayl83klaw7fagwYaI6luTmbOi4psAf7FqJNRRv5YMvU=
 github.com/nadoo/go-shadowsocks2 v0.1.0 h1:NkdUrZrI8uYq8R0YDmHLttLqKt0Z9i7dUKtGvBqZQl8=
@@ -28,15 +28,20 @@ github.com/templexxx/xor v0.0.0-20181023030647-4e92f724b73b h1:mnG1fcsIB1d/3vbkB
 github.com/templexxx/xor v0.0.0-20181023030647-4e92f724b73b/go.mod h1:5XA7W9S6mni3h5uvOC75dA3m9CCCaS83lltmc0ukdi4=
 github.com/tjfoc/gmsm v1.0.1 h1:R11HlqhXkDospckjZEihx9SW/2VW0RgdwrykyWMFOQU=
 github.com/tjfoc/gmsm v1.0.1/go.mod h1:XxO4hdhhrzAd+G4CjDqaOkd0hUzmtPR/d3EiBBMn/wc=
-github.com/xtaci/kcp-go v5.0.7+incompatible h1:zs9tc8XRID0m+aetu3qPWZFyRt2UIMqbXIBgw+vcnlE=
-github.com/xtaci/kcp-go v5.0.7+incompatible/go.mod h1:bN6vIwHQbfHaHtFpEssmWsN45a+AZwO7eyRCmEIbtvE=
+github.com/xtaci/kcp-go v5.4.4+incompatible h1:QIJ0a0Q0N1G20yLHL2+fpdzyy2v/Cb3PI+xiwx/KK9c=
+github.com/xtaci/kcp-go v5.4.4+incompatible/go.mod h1:bN6vIwHQbfHaHtFpEssmWsN45a+AZwO7eyRCmEIbtvE=
+github.com/xtaci/lossyconn v0.0.0-20190602105132-8df528c0c9ae h1:J0GxkO96kL4WF+AIT3M4mfUVinOCPgf2uUWYFUzN0sM=
+github.com/xtaci/lossyconn v0.0.0-20190602105132-8df528c0c9ae/go.mod h1:gXtu8J62kEgmN++bm9BVICuT/e8yiLI2KFobd/TRFsE=
 golang.org/x/crypto v0.0.0-20190308221718-c2843e01d9a2 h1:VklqNMn3ovrHsnt90PveolxSbWFaJdECFbxSq0Mqo2M=
 golang.org/x/crypto v0.0.0-20190308221718-c2843e01d9a2/go.mod h1:djNgcEr1/C05ACkg1iLfiJU5Ep61QUkGW8qpdssI0+w=
-golang.org/x/crypto v0.0.0-20190320223903-b7391e95e576 h1:aUX/1G2gFSs4AsJJg2cL3HuoRhCSCz733FE5GUSuaT4=
-golang.org/x/crypto v0.0.0-20190320223903-b7391e95e576/go.mod h1:djNgcEr1/C05ACkg1iLfiJU5Ep61QUkGW8qpdssI0+w=
-golang.org/x/net v0.0.0-20190320064053-1272bf9dcd53 h1:kcXqo9vE6fsZY5X5Rd7R1l7fTgnWaDCVmln65REefiE=
-golang.org/x/net v0.0.0-20190320064053-1272bf9dcd53/go.mod h1:t9HGtf8HONx5eT2rtn7q6eTqICYqUVnKs3thJo3Qplg=
+golang.org/x/crypto v0.0.0-20190820162420-60c769a6c586 h1:7KByu05hhLed2MO29w7p1XfZvZ13m8mub3shuVftRs0=
+golang.org/x/crypto v0.0.0-20190820162420-60c769a6c586/go.mod h1:yigFU9vqHzYiE8UmvKecakEJjdnWj3jj499lnFckfCI=
+golang.org/x/net v0.0.0-20190404232315-eb5bcb51f2a3 h1:0GoQqolDA55aaLxZyTzK/Y2ePZzZTUrRacwib7cNsYQ=
+golang.org/x/net v0.0.0-20190404232315-eb5bcb51f2a3/go.mod h1:t9HGtf8HONx5eT2rtn7q6eTqICYqUVnKs3thJo3Qplg=
+golang.org/x/net v0.0.0-20190813141303-74dc4d7220e7 h1:fHDIZ2oxGnUZRN6WgWFCbYBjH9uqVPRCUVUDhs0wnbA=
+golang.org/x/net v0.0.0-20190813141303-74dc4d7220e7/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s=
 golang.org/x/sys v0.0.0-20190215142949-d0b11bdaac8a/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
-golang.org/x/sys v0.0.0-20190321052220-f7bb7a8bee54 h1:xe1/2UUJRmA9iDglQSlkx8c5n3twv58+K0mPpC2zmhA=
-golang.org/x/sys v0.0.0-20190321052220-f7bb7a8bee54/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
+golang.org/x/sys v0.0.0-20190412213103-97732733099d/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
+golang.org/x/sys v0.0.0-20190813064441-fde4db37ae7a h1:aYOabOQFp6Vj6W1F80affTUvO9UxmJRx8K0gsfABByQ=
+golang.org/x/sys v0.0.0-20190813064441-fde4db37ae7a/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
diff --git a/main.go b/main.go
index 5b1f4ad..43a4728 100644
--- a/main.go
+++ b/main.go
@@ -30,7 +30,7 @@ import (
 )
 
 // VERSION .
-const VERSION = "0.7.0"
+const VERSION = "0.7.1"
 
 func main() {
 	// TODO: remove this line when Go1.13 is released.
diff --git a/proxy/obfs/http.go b/proxy/obfs/http.go
index 50941b8..3942824 100644
--- a/proxy/obfs/http.go
+++ b/proxy/obfs/http.go
@@ -43,17 +43,17 @@ func (p *HTTPObfs) NewConn(c net.Conn) (net.Conn, error) {
 
 func (c *HTTPObfsConn) writeHeader() (int, error) {
 	buf := new(bytes.Buffer)
-	buf.Write([]byte("GET " + c.obfsURI + " HTTP/1.1\r\n"))
-	buf.Write([]byte("Host: " + c.obfsHost + "\r\n"))
-	buf.Write([]byte("User-Agent: " + c.obfsUA + "\r\n"))
-	buf.Write([]byte("Upgrade: websocket\r\n"))
-	buf.Write([]byte("Connection: Upgrade\r\n"))
+	buf.WriteString("GET " + c.obfsURI + " HTTP/1.1\r\n")
+	buf.WriteString("Host: " + c.obfsHost + "\r\n")
+	buf.WriteString("User-Agent: " + c.obfsUA + "\r\n")
+	buf.WriteString("Upgrade: websocket\r\n")
+	buf.WriteString("Connection: Upgrade\r\n")
 
 	p := make([]byte, 16)
 	rand.Read(p)
-	buf.Write([]byte("Sec-WebSocket-Key: " + base64.StdEncoding.EncodeToString(p) + "\r\n"))
+	buf.WriteString("Sec-WebSocket-Key: " + base64.StdEncoding.EncodeToString(p) + "\r\n")
 
-	buf.Write([]byte("\r\n"))
+	buf.WriteString("\r\n")
 
 	return c.Conn.Write(buf.Bytes())
 }
diff --git a/proxy/socks5/packet.go b/proxy/socks5/packet.go
index 665a6c4..0a28601 100644
--- a/proxy/socks5/packet.go
+++ b/proxy/socks5/packet.go
@@ -30,7 +30,7 @@ func NewPktConn(c net.PacketConn, writeAddr net.Addr, tgtAddr socks.Addr, tgtHea
 
 	if ctrlConn != nil {
 		go func() {
-			buf := []byte{}
+			buf := make([]byte, 1)
 			for {
 				_, err := ctrlConn.Read(buf)
 				if err, ok := err.(net.Error); ok && err.Timeout() {
diff --git a/proxy/socks5/socks5.go b/proxy/socks5/socks5.go
index 351ad5e..2c3ef3d 100644
--- a/proxy/socks5/socks5.go
+++ b/proxy/socks5/socks5.go
@@ -9,6 +9,7 @@
 // socks5 server:
 // https://github.com/shadowsocks/go-shadowsocks2/tree/master/socks
 
+// Package socks5 implements a socks5 proxy.
 package socks5
 
 import (
@@ -114,7 +115,7 @@ func (s *SOCKS5) Serve(c net.Conn) {
 	if err != nil {
 		// UDP: keep the connection until disconnect then free the UDP socket
 		if err == socks.Errors[9] {
-			buf := []byte{}
+			buf := make([]byte, 1)
 			// block here
 			for {
 				_, err := c.Read(buf)
diff --git a/proxy/ws/client.go b/proxy/ws/client.go
index 0c7ccdd..291ccc9 100644
--- a/proxy/ws/client.go
+++ b/proxy/ws/client.go
@@ -15,20 +15,20 @@ import (
 
 var keyGUID = []byte("258EAFA5-E914-47DA-95CA-C5AB0DC85B11")
 
-// Client ws client
+// Client is ws client struct.
 type Client struct {
 	host string
 	path string
 }
 
-// Conn is a connection to ws server
+// Conn is a connection to ws server.
 type Conn struct {
 	net.Conn
 	reader io.Reader
 	writer io.Writer
 }
 
-// NewClient .
+// NewClient creates a new ws client.
 func NewClient(host, path string) (*Client, error) {
 	if path == "" {
 		path = "/"
@@ -37,33 +37,38 @@ func NewClient(host, path string) (*Client, error) {
 	return c, nil
 }
 
-// NewConn .
+// NewConn creates a new ws client connection.
 func (c *Client) NewConn(rc net.Conn, target string) (*Conn, error) {
 	conn := &Conn{Conn: rc}
 	return conn, conn.Handshake(c.host, c.path)
 }
 
-// Handshake handshakes with the server using HTTP to request a protocol upgrade
+// Handshake handshakes with the server using HTTP to request a protocol upgrade.
 func (c *Conn) Handshake(host, path string) error {
 	clientKey := generateClientKey()
 
 	var buf bytes.Buffer
-	buf.Write([]byte("GET " + path + " HTTP/1.1\r\n"))
-	buf.Write([]byte("Host: " + host + "\r\n"))
-	buf.Write([]byte("Upgrade: websocket\r\n"))
-	buf.Write([]byte("Connection: Upgrade\r\n"))
-	buf.Write([]byte("Origin: http://" + host + "\r\n"))
-	buf.Write([]byte("Sec-WebSocket-Key: " + clientKey + "\r\n"))
-	buf.Write([]byte("Sec-WebSocket-Protocol: binary\r\n"))
-	buf.Write([]byte("Sec-WebSocket-Version: 13\r\n"))
-	buf.Write([]byte("\r\n"))
+	buf.WriteString("GET " + path + " HTTP/1.1\r\n")
+	buf.WriteString("Host: " + host + "\r\n")
+	buf.WriteString("Upgrade: websocket\r\n")
+	buf.WriteString("Connection: Upgrade\r\n")
+	buf.WriteString("Origin: http://" + host + "\r\n")
+	buf.WriteString("Sec-WebSocket-Key: " + clientKey + "\r\n")
+	buf.WriteString("Sec-WebSocket-Protocol: binary\r\n")
+	buf.WriteString("Sec-WebSocket-Version: 13\r\n")
+	buf.WriteString(("\r\n"))
 
 	if _, err := c.Conn.Write(buf.Bytes()); err != nil {
 		return err
 	}
 
 	tpr := textproto.NewReader(bufio.NewReader(c.Conn))
-	_, code, _, ok := parseFirstLine(tpr)
+	line, err := tpr.ReadLine()
+	if err != nil {
+		return err
+	}
+
+	_, code, _, ok := parseFirstLine(line)
 	if !ok || code != "101" {
 		return errors.New("[ws] error in ws handshake parseFirstLine")
 	}
@@ -99,14 +104,7 @@ func (c *Conn) Read(b []byte) (n int, err error) {
 
 // parseFirstLine parses "GET /foo HTTP/1.1" OR "HTTP/1.1 200 OK" into its three parts.
 // TODO: move to separate http lib package for reuse(also for http proxy module)
-func parseFirstLine(tp *textproto.Reader) (r1, r2, r3 string, ok bool) {
-	line, err := tp.ReadLine()
-	// log.F("first line: %s", line)
-	if err != nil {
-		// log.F("[ws] read first line error:%s", err)
-		return
-	}
-
+func parseFirstLine(line string) (r1, r2, r3 string, ok bool) {
 	s1 := strings.Index(line, " ")
 	s2 := strings.Index(line[s1+1:], " ")
 	if s1 < 0 || s2 < 0 {
diff --git a/proxy/ws/frame.go b/proxy/ws/frame.go
index a70779f..7682cf8 100644
--- a/proxy/ws/frame.go
+++ b/proxy/ws/frame.go
@@ -45,7 +45,7 @@ type frameWriter struct {
 	maskKey []byte
 }
 
-// FrameWriter returns a frame writer
+// FrameWriter returns a frame writer.
 func FrameWriter(w io.Writer) io.Writer {
 	n := rand.Uint32()
 	return &frameWriter{
@@ -130,7 +130,7 @@ type frameReader struct {
 	leftBytes int64
 }
 
-// FrameReader returns a chunked reader
+// FrameReader returns a chunked reader.
 func FrameReader(r io.Reader) io.Reader {
 	return &frameReader{
 		Reader: r,
diff --git a/proxy/ws/ws.go b/proxy/ws/ws.go
index 3f6bf48..aa380b2 100644
--- a/proxy/ws/ws.go
+++ b/proxy/ws/ws.go
@@ -1,3 +1,4 @@
+// Package ws implements a simple websocket client.
 package ws
 
 import (
@@ -10,7 +11,7 @@ import (
 	"github.com/nadoo/glider/proxy"
 )
 
-// WS .
+// WS is the base ws proxy struct.
 type WS struct {
 	dialer proxy.Dialer
 	addr   string
@@ -63,7 +64,7 @@ func NewWSDialer(s string, dialer proxy.Dialer) (proxy.Dialer, error) {
 	return NewWS(s, dialer)
 }
 
-// Addr returns forwarder's address
+// Addr returns forwarder's address.
 func (s *WS) Addr() string {
 	if s.addr == "" {
 		return s.dialer.Addr()
@@ -71,7 +72,7 @@ func (s *WS) Addr() string {
 	return s.addr
 }
 
-// NextDialer returns the next dialer
+// NextDialer returns the next dialer.
 func (s *WS) NextDialer(dstAddr string) proxy.Dialer { return s.dialer.NextDialer(dstAddr) }
 
 // Dial connects to the address addr on the network net via the proxy.