Programming Tutorials

  Few things induce panic in a backend developer like a sudden "502 Bad Gateway" error during a critical production task. On managed hosting platforms like SiteGround, this scenario is notoriously common when running resource-intensive operations—massive WooCommerce product imports, complex backups, or bulk image regeneration. The screen goes white, the NGINX error page appears, and your process terminates halfway through. While the immediate symptom is an HTTP error, the root cause lies deep within the interaction between the NGINX reverse proxy, the PHP-FPM process manager, and the strict execution policies enforced on shared and cloud architecture. This guide details the architectural cause of these timeouts and provides technically rigorous solutions to bypass SiteGround’s hard limits using configuration overrides, WP-CLI, and batch-processing patterns. Root Cause Analysis: The NGINX/PHP-FPM Handshake To fix a 502 error, you must understand what generates it. On SiteGroun...