Recover normal status in laravel from a crash

I am doing a project with laravel, but i got some problems, the big one is that when i pick the back arrow in the navigator while the client is making the get method to the server, the server "crash", i say this because it seems like that, when this happen, i can not go to any pages because it still charging, i do not have ide of the reason.

this is the code where i get the data:

    $curlSession = curl_init();
    curl_setopt($curlSession, CURLOPT_URL, $url);
    curl_setopt($curlSession, CURLOPT_BINARYTRANSFER, true);
    curl_setopt($curlSession, CURLOPT_RETURNTRANSFER, true);
    curl_setopt($curlSession, CURLOPT_TIMEOUT, 60);
    $jsonData = curl_exec($curlSession);
    $curl_errno = curl_errno($curlSession);
    curl_close($curlSession); 
    if ($curl_errno > 0) {
        return back()
        ->with('errorConn', true);    
    } 

If someone know how to put a general timeout for this cases, it would help.

Thanks to all.