504 Gateway Timeout on cPanel Hosting: What Causes It
Tested in a ShoHost sandbox on 12 October 2026: nginx 1.26 as a front proxy (like the proxy or CDN in front of many hosting servers) in front of Apache 2.4.68 and PHP 8.4, captured with headless Chrome. We set a short 5-second proxy timeout and ran a PHP script that sleeps for 20 seconds,…