Stopped at Firewall with Simultaneous Access: Security: Symphony 2

Environment and Prerequisites

• Implementing authentication. (config:firewalls)
• Introducing bundle FOSUserBundle
• The following actions are performed while logged in.

There is simply an action to sleep.

routing:demo_home_index

indexAction()
{
    sleep(60);

    return//...
}

There is an action to load a file.

routing:demo_home_read

public function readAction()
{
    $file="/path/to/file/read.txt";
    $contents=false;

    if(file_exists($file)){
        $fp = fopen($file, 'r');
        $contents=fgets($fp);
        fclose($fp);
    }

    return new Response(json_encode(array(
        'contents' = > $contents,
    )));
}

First, access indexAction asynchronously from the UI.
At the same time as the , the process of loading files runs through the interval.

$.ajax({
    url —Routing.generate("demo_home_index"),
    type: "GET",
    dataType: 'json'
})
.done(function(response){
    // I don't get 60 seconds back because I sleep.
    console.log(response);
});

vartimer = setInterval(function(){
    $.ajax({
        url —Routing.generate("demo_home_read"),
        type: "GET",
        dataType: 'json'
    })
    .done(function(response){
        console.log(response);
    });
}, 3000);

At this time, the firewall is stuck in the interval every three seconds, or the process of sleeping, or the access at the interval is not completed until the first access indexAction is completed.

Therefore, the interval is accessed periodically, but the entire interval is loaded for 60 seconds, and when the first access and processing (sleep 60 seconds) is completed, all the intervals are accessed sequentially.

Regardless of async, even if you access the page on a separate tab (such as otherAction) while you sleep for 60 seconds, you will be in a loading state and access will be interrupted.

By changing the firewall settings for Symphony 2 itself, etc.,
Is it possible for the firewall to process simultaneously without interruption?

Or are you limiting simultaneous access during processing due to a bundle issue?

At the moment, the cause is unknown.
Thank you for your cooperation.