// inputs not performing any network calls.
		return cfg, nil
	}

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

	return cfg, nil