if transport == nil {
		// when transport is nil, it means we are just validating the
		// inputs not performing any network calls.
		return cfg, nil
	}

	// Make sure to clone the transport before editing the ProxyURL
	if proxyURL != nil {
		ctransport := transport.(*http.Transport).Clone()
		ctransport.Proxy = http.ProxyURL((*url.URL)(proxyURL))
		cfg.transport = ctransport
	} else {
		cfg.transport = transport