header("Content-Type: application/json");

　　header("Expires: 0");

　　header("Last-Modified: " . gmdate("D, d M Y H:i:s") . " GMT");

　　header("Cache-Control: no-store, no-cache, must-revalidate");

　　header("Cache-Control: post-check=0, pre-check=0", false);

　　header("Pragma: no-cache");