PHP Code Igniter Server not responding on some requests while Server Sent Event is running

Question

I have this SSE running and sending event to client every 1 second. The problem is the server stops responding to other client's requests while SSE is running.

//client

var time;
var source = new EventSource(url);
source.addEventListener('time', (e)=>{
   time= e.data;
}, false);


//in my controller (CodeIgniter)

header('Content-Type: text/event-stream');
header('Cache-Control: no-cache'); 
while(true){
    echo "id: 12" . PHP_EOL;
    echo "event: time\n";
    echo "data: ".date('F j, Y g:i:s A ', time()). PHP_EOL;
    echo PHP_EOL;

    ob_flush();
    flush();

    if ( connection_aborted() ) break;

    sleep(1);
};

Answer 1

Might be a problem with session lock. Try adding session_write_close(); above sleep(1) statement