From a1577f80dff50f58d581ed63cb97bd456299a5ed Mon Sep 17 00:00:00 2001
From: fangdingjun <fangdingjun@szchuzhong.com>
Date: Thu, 19 Jul 2018 11:22:11 +0800
Subject: [PATCH] support nil cfg

---
 conn.go | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/conn.go b/conn.go
index 866a7be..e439342 100644
--- a/conn.go
+++ b/conn.go
@@ -41,6 +41,14 @@ type Conn struct {
 // the Conn.Run have already called, should not call it again
 func Dial(network, addr string, cfg *tls.Config) (*Conn, error) {
 	nextProto := []string{"h2"}
+	if cfg == nil {
+		_addr := addr
+		h, _, err := net.SplitHostPort(addr)
+		if err == nil {
+			_addr = h
+		}
+		cfg = &tls.Config{ServerName: _addr}
+	}
 	cfg.NextProtos = nextProto
 	conn, err := tls.Dial(network, addr, cfg)
 	if err != nil {