本地页面存1天的缓存

// cache 1 day (86400 seconds)
// Cache-control will overwrite Pragma, the later is for http 1.0 standard
header("Pragma: cache");
header("Cache-Control: max-age=86400");
header('Expires: '.gmdate('D, d M Y H:i:s \G\M\T', time() + 86400));
header('Content-Type: application/json');