Why does the browser hang when canceling an AJAX request in Yii?

Question

JavaScript

Hello! I am writing a request to the controller action in the AJAX view, a long request with sleep () is executed in the controller, the problem is that if you refresh the page or go to another page of the site while the php script is running, then everything will hang until the php execution ends script.

I tried to execute this AJAX request to a separate PHP file where I put sleep and also refresh the page, then everything works fine. It turns out that you need to somehow execute long requests to the action differently. Tell me in which direction you need to dig?

in code view

Yii::app()->clientScript->registerScript('loading', " 
var timestamp = 0;
function WaitMessage()
    {
        $.ajax({
            type: 'POST',
            url: '/index.php/message/ajax',
            data: {send:".$id.",timestamp:timestamp},
            async: true,
            cache: false,
            success: function(data){     
                   $('#message_container').html(data);
            },
        });
    }
WaitMessage();
  ", CClientScript::POS_READY);

in action

public function actionAjax()
  { 
    if(Yii::app()->request->isAjaxRequest && isset($_POST['send'])){
      //пока не пройдет 20сек ничего сделать на сайте нельзя
      sleep(20);
      echo('Прошел!');
    }
  }

So far, I see a solution in creating a separate controller for ajax requests.

Answer 1

One possible problem: Yii locks the session file. Accordingly, until php releases it, other requests are not possible.
Do Yii::app()->session->close() before long query, after doing Yii::app()->session->open().
In general, it is better to send long requests to the job server, for asynchronous operation.

Answer 2

Thanks for the help and it did! About job of the server did not hear, I esteem.