502 Bad Gateway: Proxy, CDN and PHP-FPM Causes
Tested in a ShoHost sandbox on 12 October 2026: nginx 1.26 as a front proxy, captured with headless Chrome. We simulated two broken backends: one that accepts the connection and then closes it without replying (as a crashed PHP-FPM worker or app does), and one port where nothing is running. Every screenshot below is from…
