diff --git a/README.md b/README.md
index b4e4574..2025004 100644
--- a/README.md
+++ b/README.md
@@ -91,7 +91,7 @@ glider -config CONFIGPATH -listen :8080 -verbose
 
 ## Usage
 ```bash
-glider v0.5.3 usage:
+glider v0.5.2 usage:
   -checkduration int
         proxy check duration(seconds) (default 30)
   -checkwebsite string
@@ -175,7 +175,7 @@ Examples:
   glider -listen redir://:1081 -forward ss://method:pass@1.1.1.1:8443
     -listen on :1081 as a transparent redirect server, forward all requests via remote ss server.
 
-  glider -listen redir://:1081 -forward ssr://method:pass@1.1.1.1:8444?protocol=a&protocol_param=b&obfs=c&obfs_param=d
+  glider -listen redir://:1081 -forward "ssr://method:pass@1.1.1.1:8444?protocol=a&protocol_param=b&obfs=c&obfs_param=d"
     -listen on :1081 as a transparent redirect server, forward all requests via remote ssr server.
 
   glider -listen tcptun://:80=2.2.2.2:80 -forward ss://method:pass@1.1.1.1:8443
diff --git a/conf.go b/conf.go
index 7e55cb2..fcd6bd9 100644
--- a/conf.go
+++ b/conf.go
@@ -200,7 +200,7 @@ func usage() {
 	fmt.Fprintf(os.Stderr, "  "+app+" -listen redir://:1081 -forward ss://method:pass@1.1.1.1:8443\n")
 	fmt.Fprintf(os.Stderr, "    -listen on :1081 as a transparent redirect server, forward all requests via remote ss server.\n")
 	fmt.Fprintf(os.Stderr, "\n")
-	fmt.Fprintf(os.Stderr, "  "+app+" -listen redir://:1081 -forward ssr://method:pass@1.1.1.1:8444?protocol=a&protocol_param=b&obfs=c&obfs_param=d\n")
+	fmt.Fprintf(os.Stderr, "  "+app+" -listen redir://:1081 -forward \"ssr://method:pass@1.1.1.1:8444?protocol=a&protocol_param=b&obfs=c&obfs_param=d\"\n")
 	fmt.Fprintf(os.Stderr, "    -listen on :1081 as a transparent redirect server, forward all requests via remote ssr server.\n")
 	fmt.Fprintf(os.Stderr, "\n")
 	fmt.Fprintf(os.Stderr, "  "+app+" -listen tcptun://:80=2.2.2.2:80 -forward ss://method:pass@1.1.1.1:8443\n")
diff --git a/config/README.md b/config/README.md
index cc110f1..89da5d8 100644
--- a/config/README.md
+++ b/config/README.md
@@ -39,7 +39,7 @@ checkduration=30
 
 
 # Setup a dns forwarding server
-dns://53
+dns=:53
 # global remote dns server (you can specify different dns server in rule file)
 dnsserver=8.8.8.8:53
 
diff --git a/http.go b/http.go
index aebc5df..69fedd7 100644
--- a/http.go
+++ b/http.go
@@ -118,7 +118,7 @@ func (s *HTTP) Serve(c net.Conn) {
 
 	url, err := url.ParseRequestURI(requestURI)
 	if err != nil {
-		logf("parse request url error: %s", err)
+		logf("proxy-http parse request url error: %s", err)
 		return
 	}
 
@@ -150,9 +150,11 @@ func (s *HTTP) Serve(c net.Conn) {
 
 	// copy the left request bytes to remote server. eg. length specificed or chunked body.
 	go func() {
-		io.Copy(rc, reqR)
-		rc.SetDeadline(time.Now())
-		c.SetDeadline(time.Now())
+		if _, err := reqR.Peek(1); err == nil {
+			io.Copy(rc, reqR)
+			rc.SetDeadline(time.Now())
+			c.SetDeadline(time.Now())
+		}
 	}()
 
 	respR := bufio.NewReader(rc)
@@ -197,7 +199,7 @@ func (s *HTTP) servHTTPS(method, requestURI, proto string, c net.Conn) {
 
 	c.Write([]byte("HTTP/1.0 200 Connection established\r\n\r\n"))
 
-	logf("proxy-http %s <-> %s [connect]", c.RemoteAddr(), requestURI)
+	logf("proxy-http %s <-> %s [c]", c.RemoteAddr(), requestURI)
 
 	_, _, err = relay(c, rc)
 	if err != nil {
diff --git a/main.go b/main.go
index 3a5ec29..5c80aea 100644
--- a/main.go
+++ b/main.go
@@ -9,7 +9,7 @@ import (
 )
 
 // VERSION .
-const VERSION = "0.5.3"
+const VERSION = "0.5.2"
 
 func dialerFromConf() Dialer {
 	// global forwarders in xx.conf
diff --git a/ss.go b/ss.go
index 08788fb..c65f90f 100644
--- a/ss.go
+++ b/ss.go
@@ -25,7 +25,7 @@ type SS struct {
 func NewSS(addr, method, pass string, dialer Dialer) (*SS, error) {
 	ciph, err := core.PickCipher(method, nil, pass)
 	if err != nil {
-		log.Fatalf("PickCipher for '%s', error: %s", method, err)
+		log.Fatalf("proxy-ss PickCipher for '%s', error: %s", method, err)
 	}
 
 	s := &SS{
diff --git a/ssr.go b/ssr.go
index 991d082..8fc369e 100644
--- a/ssr.go
+++ b/ssr.go
@@ -92,6 +92,10 @@ func (s *SSR) Dial(network, addr string) (net.Conn, error) {
 	port, _ := strconv.Atoi(rs[1])
 
 	ssrconn.IObfs = obfs.NewObfs(s.Obfs)
+	if ssrconn.IObfs == nil {
+		return nil, errors.New("proxy-ssr unsupported obfs type: " + s.Obfs)
+	}
+
 	obfsServerInfo := &ssr.ServerInfoForObfs{
 		Host:   rs[0],
 		Port:   uint16(port),
@@ -99,7 +103,12 @@ func (s *SSR) Dial(network, addr string) (net.Conn, error) {
 		Param:  s.ObfsParam,
 	}
 	ssrconn.IObfs.SetServerInfo(obfsServerInfo)
+
 	ssrconn.IProtocol = protocol.NewProtocol(s.Protocol)
+	if ssrconn.IProtocol == nil {
+		return nil, errors.New("proxy-ssr unsupported protocol type: " + s.Protocol)
+	}
+
 	protocolServerInfo := &ssr.ServerInfoForObfs{
 		Host:   rs[0],
 		Port:   uint16(port),