return ParametredHttpServlet.hasGzipSupport(facesContext);
return ConfiguredHttpServlet.hasGzipSupport(facesContext);
    protected final boolean canUseGzip(FacesContext facesContext) {        if (useGzip == false) {            return false;        }        if (facesContext == null) {            return true;        }        // On verifie que le browser le supporte        return ParametredHttpServlet.hasGzipSupport(facesContext);    }