Improve: using native http request

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