default void initializeDefaultHttpProxy(final Map<String, Object> paramMap) {
        final FessConfig fessConfig = ComponentUtil.getFessConfig();
        final String proxyHost = fessConfig.getHttpProxyHost();
        final String proxyPort = fessConfig.getHttpProxyPort();
        if (StringUtil.isNotBlank(proxyHost) && StringUtil.isNotBlank(proxyPort)) {
            paramMap.put(Param.Client.PROXY_HOST, proxyHost);

        return true;
    }

    String getHttpProxyHost();

    Integer getHttpProxyPortAsInteger();

    String getHttpProxyUsername();

    String getHttpProxyPassword();

    default Proxy getHttpProxy() {
        Proxy proxy = (Proxy) propMap.get(HTML_PROXY);
        if (proxy == null) {
            if (StringUtil.isNotBlank(getHttpProxyHost()) && getHttpProxyPortAsInteger() != null) {

     * The value is, e.g.  <br>
     * comment: Hostname for the HTTP proxy server.
     * @return The value of found property. (NotNull: if not found, exception but basically no way)
     */
    String getHttpProxyHost();

    /**
     * Get the value for the key 'http.proxy.host' as {@link Integer}. <br>
     * The value is, e.g.  <br>
     * comment: Hostname for the HTTP proxy server.