IdleConnTimeout:       timeout,
		TLSHandshakeTimeout:   timeout,
		ExpectContinueTimeout: timeout,
		TLSClientConfig: &tls.Config{
			RootCAs:            globalRootCAs,
			ClientSessionCache: tls.NewLRUClientSessionCache(tlsClientSessionCacheSize),
		},
		DisableCompression: true,
	}
	return updateTransport
}

		PreferServerCipherSuites: true,
		MinVersion:               tls.VersionTLS12,
		NextProtos:               []string{"http/1.1", "h2"},
		GetCertificate:           getCert,
		ClientSessionCache:       tls.NewLRUClientSessionCache(tlsClientSessionCacheSize),
	}

	tlsClientIdentity := env.Get(xtls.EnvIdentityTLSEnabled, "") == config.EnableOn
	if tlsClientIdentity {
		tlsConfig.ClientAuth = tls.RequestClientCert
	}