How to reuse the http.client in plugin

Traefik Traefik v3 (latest)
1

Hi Gurus,

I am writing a plugin to invoke the API of another remote web server, the GET body is based on the incoming request.

Now I put the client generation part in a dedicated function and for each new incoming request, this function will be used to generate a new client, may I know how could I set it to a global one so that all the incoming request could re-use it?

Thanks.

func (ta *TLSAuth2) ServeHTTP(w http.ResponseWriter, r *http.Request) {

	GetBodydata, _ := json.Marshal(&struct)
	ta.someFunction(GetBodydata)

	// Continue with next handler
	ta.next.ServeHTTP(w, r)
}

func (ta *TLSAuth2) someFunction(data []byte) {
	caPath := "./ca.crt"
	certPath := "./tls.crt"
	keyPath := "./tls.key"

	// load CA
	caCert, errReadCA := os.ReadFile(caPath)
	if errReadCA != nil {
		fmt.Fprintf(os.Stdout, "%s [%v] Loading %v with error: %v\n", time.Now().Format(time.RFC3339), ta.name, caPath, errReadCA)
		return
	}

	// load cert and key pair
	cert, errLoadCertKey := tls.LoadX509KeyPair(certPath, keyPath)
	if errLoadCertKey != nil {
		fmt.Fprintf(os.Stdout, "%s [%v] Loading %v and %v with error: %v\n", time.Now().Format(time.RFC3339), ta.name, certPath, keyPath, errLoadCertKey)
		return
	}
	caCertPool := x509.NewCertPool()
	caCertPool.AppendCertsFromPEM(caCert)

	client := &http.Client{
		Transport: &http.Transport{
			TLSClientConfig: &tls.Config{
				RootCAs:      caCertPool,
				Certificates: []tls.Certificate{cert},
			},
		},
	}
    
	...
}