<?php require_once '../../resources/portabilityLayer.php'; clearstatcache(); if ($_SERVER["HTTP_IF_MODIFIED_SINCE"]) { header("HTTP/1.0 304 Not Modified"); header("Content-Type: text/plain"); exit(); } $one_year = 12 * 31 * 24 * 60 * 60; $last_modified = gmdate(DATE_RFC1123, time() - $one_year); $expires = gmdate(DATE_RFC1123, time() + $one_year); header('Cache-Control: public, max-age=' . $one_year); header('Expires: ' . $expires); header('Content-Type: text/css'); header('Etag: 123456789'); header('Last-Modified: ' . $last_modified); ?> #test { background-color: rgb(0, 255, 0); }