func TestUpgradeResponse(t *testing.T) {
	testCases := []struct {
		connectionHeader string
		upgradeHeader    string
		shouldError      bool
	}{
		{
			connectionHeader: "",
			upgradeHeader:    "",
			shouldError:      true,
		},
		{
			connectionHeader: "Upgrade",
			upgradeHeader:    "",
			shouldError:      true,
		},
		{
			connectionHeader: "",
			upgradeHeader:    "SPDY/3.1",
			shouldError:      true,

	connectionHeader := strings.ToLower(req.Header.Get(httpstream.HeaderConnection))
	upgradeHeader := strings.ToLower(req.Header.Get(httpstream.HeaderUpgrade))
	if !strings.Contains(connectionHeader, strings.ToLower(httpstream.HeaderUpgrade)) || !strings.Contains(upgradeHeader, strings.ToLower(HeaderSpdy31)) {