Nginx_X-Accel-Redirect 配置好后 访问不到文件

   nginx配置文件添加了

location /protected {
     internal;
     alias   /resource/static_state;
    }

后台访问 down.php

<?php

header("Content-Type:application/octet-stream;charset=utf-8");
header('Content-Disposition: attachment; filename=test.zip');
header('X-Accel-Redirect: /protected/program.zip');

?>

每次访问down.php 都是下载的2k 是404的html文件  求各位大大帮忙看看