I am sending 300 newsletter at a time with a url, after 2 min it refresh itself again to send next 300 at so on.
But I am getting this error:
Gateway Time-out
The gateway did not receive a timely response from the upstream server or application.
Additionally, a 404 Not Found error was encountered while trying to use an ErrorDocument to handle the request.
I have set max execution to 3600
ini_set('max_execution_time', 3600);
But I am regularly getting same error. Please help me to find out the solution.