Improve: using native http request

constant/adapters.go

@@ -2,17 +2,19 @@ package constant
 
 import (
 	"io"
+	"net"
 )
 
 type ProxyAdapter interface {
-	Writer() io.Writer
-	Reader() io.Reader
+	ReadWriter() io.ReadWriter
+	Conn() net.Conn
 	Close()
 }
 
 type ServerAdapter interface {
 	Addr() *Addr
-	ProxyAdapter
+	Connect(ProxyAdapter)
+	Close()
 }
 
 type Proxy interface {

constant/addr.go

@@ -9,10 +9,23 @@ const (
 	AtypIPv4       = 1
 	AtypDomainName = 3
 	AtypIPv6       = 4
+
+	TCP = iota
+	UDP
 )
 
+type NetWork int
+
+func (n *NetWork) String() string {
+	if *n == TCP {
+		return "tcp"
+	}
+	return "udp"
+}
+
 // Addr is used to store connection address
 type Addr struct {
+	NetWork  NetWork
 	AddrType int
 	Host     string
 	IP       *net.IP