AssetServlet.java 文件源码

@Override
protected void putHeaders(HttpServletResponse response, HttpContent content, long contentLength) {
    super.putHeaders(response, content, contentLength);
    HttpFields fields = ((Response) response).getHttpFields();
    if (requestHolder.get().getDispatcherType() == DispatcherType.ERROR) {
        /*
         * Do not cache error page and also makes sure that error page is not eligible for 
         * modification check. That is, error page will be always retrieved.
         */
           fields.put(HttpHeader.CACHE_CONTROL, "must-revalidate,no-cache,no-store");
    } else if (requestHolder.get().getRequestURI().equals("/favicon.ico")) {
        /*
         * Make sure favicon request is cached. Otherwise, it will be requested for every 
         * page request.
         */
        fields.put(HttpHeader.CACHE_CONTROL, "max-age=86400,public");
    }
}