protected Ini loadIniFromConfig() {
        Ini ini = null;
        String config = getConfig();
        if (config != null) {
            ini = convertConfigToIni(config);
        }
        return ini;
    }
Sets the config path to be used to load a .ini file for configuration if a configuration is
not specified via the {@link #getConfig() config} attribute.
<p/>
This value is {@code null} by default, but it will be automatically set to the value of the
'{@code configPath}' {@code init-param} if it exists in the {@code FilterConfig} provided by the servlet
container at startup.

@param configPath the config path to be used to load a .ini file for configuration if a configuration is
                  not specified via the {@link #getConfig() config} attribute.
web/src/main/java/org/apache/shiro/web/servlet/IniShiroFilter.java