fastcgi_buffer_size

Beike Product & Technology

Mar 16, 2018 · Backend Development

Investigation of Nginx 502 Errors Caused by Large Response Headers from PHP‑FPM

This article analyzes a recurring Nginx 502 Bad Gateway error triggered by oversized response headers from PHP‑FPM, explores whether fastcgi_buffer_size is the root cause, captures communication data between Nginx and PHP‑FPM, conducts systematic tests with varying buffer sizes, and draws conclusions about header handling and buffer configuration.