Add h2c support (#1398)

gin_test.go

@@ -19,6 +19,7 @@ import (
 	"time"
 
 	"github.com/stretchr/testify/assert"
+	"golang.org/x/net/http2"
 )
 
 func formatAsDate(t time.Time) string {
@@ -79,6 +80,39 @@ func TestLoadHTMLGlobDebugMode(t *testing.T) {
 	assert.Equal(t, "<h1>Hello world</h1>", string(resp))
 }
 
+func TestH2c(t *testing.T) {
+	ln, err := net.Listen("tcp", "127.0.0.1:0")
+	if err != nil {
+		fmt.Println(err)
+	}
+	r := Default()
+	r.UseH2C = true
+	r.GET("/", func(c *Context) {
+		c.String(200, "<h1>Hello world</h1>")
+	})
+	go http.Serve(ln, r.Handler())
+	defer ln.Close()
+
+	url := "http://" + ln.Addr().String() + "/"
+
+	http := http.Client{
+		Transport: &http2.Transport{
+			AllowHTTP: true,
+			DialTLS: func(netw, addr string, cfg *tls.Config) (net.Conn, error) {
+				return net.Dial(netw, addr)
+			},
+		},
+	}
+
+	res, err := http.Get(url)
+	if err != nil {
+		fmt.Println(err)
+	}
+
+	resp, _ := ioutil.ReadAll(res.Body)
+	assert.Equal(t, "<h1>Hello world</h1>", string(resp))
+}
+
 func TestLoadHTMLGlobTestMode(t *testing.T) {
 	ts := setupHTMLFiles(
 		t,