diff --git a/server_option_test.go b/server_option_test.go
index 4e70944..e72bbbd 100644
--- a/server_option_test.go
+++ b/server_option_test.go
@@ -21,7 +21,7 @@ import (
 )
 
 func Test_ServerOption(t *testing.T) {
-	t.Run("2. Subprotocol", func(t *testing.T) {
+	t.Run("2.1 Subprotocol", func(t *testing.T) {
 		ts := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
 			_, err := Upgrade(w, r, WithServerSubprotocols([]string{"crud", "im"}))
 			if err != nil {
@@ -45,4 +45,55 @@ func Test_ServerOption(t *testing.T) {
 			t.Error("header fail")
 		}
 	})
+
+	t.Run("2.2 Subprotocol", func(t *testing.T) {
+		ts := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+			_, err := Upgrade(w, r, WithServerSubprotocols([]string{"crud", "im"}))
+			if err != nil {
+				t.Error(err)
+			}
+		}))
+
+		defer ts.Close()
+
+		url := strings.ReplaceAll(ts.URL, "http", "ws")
+		h := make(http.Header)
+		con, err := Dial(url, WithClientBindHTTPHeader(&h), WithClientHTTPHeader(http.Header{
+			"Sec-WebSocket-Protocol": []string{"crud"},
+		}))
+		if err != nil {
+			t.Error(err)
+		}
+		defer con.Close()
+
+		if h["Sec-Websocket-Protocol"][0] != "crud" {
+			t.Error("header fail")
+		}
+	})
+
+	t.Run("2.3 Subprotocol", func(t *testing.T) {
+		upgrade := NewUpgrade(WithServerSubprotocols([]string{"crud", "im"}))
+		ts := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+			_, err := upgrade.Upgrade(w, r)
+			if err != nil {
+				t.Error(err)
+			}
+		}))
+
+		defer ts.Close()
+
+		url := strings.ReplaceAll(ts.URL, "http", "ws")
+		h := make(http.Header)
+		con, err := Dial(url, WithClientBindHTTPHeader(&h), WithClientHTTPHeader(http.Header{
+			"Sec-WebSocket-Protocol": []string{"crud"},
+		}))
+		if err != nil {
+			t.Error(err)
+		}
+		defer con.Close()
+
+		if h["Sec-Websocket-Protocol"][0] != "crud" {
+			t.Error("header fail")
+		}
+	})
 }