Nginx 504 Gateway Timeout: Diagnosing proxy_read_timeout
A 504 from Nginx often means the upstream backend did not respond within proxy_read_timeout. Confirm the timing mismatch before changing the limit.
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502 Bad Gateway on upstream timeout: worker memory growth
502 Bad Gateway on upstream timeout: worker memory growth When an upstream server fails to respond within the value set by upstream_connect_timeout , Nginx logs a 502 Bad Gateway and the worker process shows a steady increase in resident set size during sustained load. The increase is observed only when proxy_buffering is enabled and a high number of keep‑al
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