如何在Golang服务器中添加OCSP装订？

This is how I configured my golang server:

func main() {
    ....
    config := &tls.Config{
        MinVersion: tls.VersionTLS12,
        PreferServerCipherSuites: true,
    }
    server := &http.Server{Addr: ":"+port, Handler: router, TLSConfig: config}
    err = server.ListenAndServeTLS(cert, key)
    ....
}

but our security vendor complaining on:

The server does not support OCSP stapling

How exactly to implement this?