clientTLS              *tls.Config
		proxyAuth              *url.Userinfo
		serverConnectionHeader string
		serverFunc             serverFunc
		serverStatusCode       int
		serverUpgradeHeader    string
		shouldError            bool
	}{
		"proxied without auth -> http": {
			serverFunc:             httptest.NewServer,
			serverConnectionHeader: "Upgrade",
			serverStatusCode:       http.StatusSwitchingProtocols,

	testcases := map[string]struct {
		ServerFunc       func(http.Handler) *httptest.Server
		ProxyTransport   http.RoundTripper
		UpgradeTransport UpgradeRequestRoundTripper
		ExpectedAuth     string
	}{
		"http": {
			ServerFunc:     httptest.NewServer,
			ProxyTransport: nil,
		},
		"both client and server support http2, but force to http/1.1 for upgrade": {
			ServerFunc: func(h http.Handler) *httptest.Server {

	json.NewEncoder(w).Encode(res)
	return
}

func main() {
	flag.Parse()
	serveFunc := func() error {
		return http.ListenAndServe(":8080", nil)
	}

	if certFile != "" || keyFile != "" {
		if certFile == "" || keyFile == "" {
			log.Fatal("Please provide both a key file and a cert file to enable TLS.")
		}
		serveFunc = func() error {
			return http.ListenAndServeTLS(":8080", certFile, keyFile, nil)
		}
	}