How do I configure the Server-sent events to be used under Nginx?

Using PHP+JS to implement server Push, in the WAMP environment can be effective, but transferred to the Nginx under Linux, it is not used, is the environment configuration problem? How do I configure it?
The following is the relevant code
Server-side PHP code:

date_default_timezone_set("America/New_York");header("Content-Type:text/event-stream");$userid = $_SESSION['userid'];//session_write_close();$db = get_db();while(true) {  $notices = $db->lRange("User:{$userid}:Notice", 0, -1);  $notice_num = 0;  foreach ($notices as $value) {    $readed = $db->hGet("Notice:{$value}:Info", 'readed');    if ($readed == false) {      $notice_num++;    }  }  echo "event: ping\n";    $curDate = $notice_num;    echo 'data: {"time": "' . $curDate . '"}';    echo "\n\n";    ob_flush();    flush();    sleep(30);}

Front-end JS:

var evtSource = new EventSource(serverName + 'index.php/Home/NoticePush/index');    evtSource.addEventListener("ping", function(e) {         var obj = JSON.parse(e.data);         $('div#header div#user_notice a').text(obj.time);   }, false);

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Using PHP+JS to implement server Push, in the WAMP environment can be effective, but transferred to the Nginx under Linux, it is not used, is the environment configuration problem? How do I configure it?
The following is the relevant code
Server-side PHP code:

date_default_timezone_set("America/New_York");header("Content-Type:text/event-stream");$userid = $_SESSION['userid'];//session_write_close();$db = get_db();while(true) {  $notices = $db->lRange("User:{$userid}:Notice", 0, -1);  $notice_num = 0;  foreach ($notices as $value) {    $readed = $db->hGet("Notice:{$value}:Info", 'readed');    if ($readed == false) {      $notice_num++;    }  }  echo "event: ping\n";    $curDate = $notice_num;    echo 'data: {"time": "' . $curDate . '"}';    echo "\n\n";    ob_flush();    flush();    sleep(30);}

Front-end JS:

var evtSource = new EventSource(serverName + 'index.php/Home/NoticePush/index');    evtSource.addEventListener("ping", function(e) {         var obj = JSON.parse(e.data);         $('div#header div#user_notice a').text(obj.time);   }, false);

Because the nginx buffer problem, the default nginx is a buffer, PHP refresh output to nginx invalid.
Need to output the front and add a

header('X-Accel-Buffering: no');

