proxyHost / proxyPort parameters seem to be ignored by HTTP4 component (and HTTP component)

    private HttpClientConfigurer configureHttpProxy(Map<String, Object> parameters, HttpClientConfigurer configurer, boolean secure) throws Exception {
        String proxyAuthScheme = getParameter(parameters, "proxyAuthScheme", String.class);
        if (proxyAuthScheme == null) {
            // fallback and use either http or https depending on secure
            proxyAuthScheme = secure ? "https" : "http";
        }
        String proxyAuthHost = getParameter(parameters, "proxyAuthHost", String.class);
        Integer proxyAuthPort = getParameter(parameters, "proxyAuthPort", Integer.class);

        if (proxyAuthHost != null && proxyAuthPort != null) {
            String proxyAuthUsername = getParameter(parameters, "proxyAuthUsername", String.class);
            String proxyAuthPassword = getParameter(parameters, "proxyAuthPassword", String.class);
            String proxyAuthDomain = getParameter(parameters, "proxyAuthDomain", String.class);
            String proxyAuthNtHost = getParameter(parameters, "proxyAuthNtHost", String.class);

            if (proxyAuthUsername != null && proxyAuthPassword != null) {
                return CompositeHttpConfigurer.combineConfigurers(
                    configurer, new ProxyHttpClientConfigurer(proxyAuthHost, proxyAuthPort, proxyAuthScheme, proxyAuthUsername, proxyAuthPassword, proxyAuthDomain, proxyAuthNtHost));
            } else {
                return CompositeHttpConfigurer.combineConfigurers(configurer, new ProxyHttpClientConfigurer(proxyAuthHost, proxyAuthPort, proxyAuthScheme));
            }
        }

        return configurer;
    }