}
        return null;
    }

    public static String encodeUrl(final String url) {
        final String enc = LaRequestUtil.getOptionalRequest().filter(req -> req.getCharacterEncoding() != null)
                .map(HttpServletRequest::getCharacterEncoding).orElse(Constants.UTF_8);
        final StringBuilder buf = new StringBuilder(url.length() + 100);
        for (final char c : url.toCharArray()) {

        final DiskFileItemFactory fileItemFactory = createDiskFileItemFactory();
        final ServletFileUpload upload = newServletFileUpload(fileItemFactory);
        upload.setHeaderEncoding(request.getCharacterEncoding());
        upload.setSizeMax(getSizeMax());
        return upload;
    }

    protected ServletFileUpload newServletFileUpload(final DiskFileItemFactory fileItemFactory) {

        }
        buf.append("; charset=");
        final String enc;
        if (encoding == null) {
            enc = LaRequestUtil.getOptionalRequest().map(HttpServletRequest::getCharacterEncoding).orElse(Constants.UTF_8);
        } else {
            enc = encoding;
        }
        buf.append(enc);
        final HttpServletResponse response = LaResponseUtil.getResponse();