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) {

     * @return The value of found property. (NotNull: if not found, exception but basically no way)
     * @throws NumberFormatException When the property is not integer.
     */
    Integer getHttpProxyPortAsInteger();

    /**
     * Get the value for the key 'http.proxy.username'. <br>
     * The value is, e.g.  <br>
     * @return The value of found property. (NotNull: if not found, exception but basically no way)