ts := newClientServerTest(t, mode, HandlerFunc(func(w ResponseWriter, r *Request) {
		t.Error("unexpected HTTPS request")
	}), func(ts *httptest.Server) {
		var errBuf bytes.Buffer
		ts.Config.ErrorLog = log.New(&errBuf, "", 0)
	}).ts
	conn, err := net.Dial("tcp", ts.Listener.Addr().String())
	if err != nil {
		t.Fatal(err)
	}
	defer conn.Close()