Ivan Velichko • 9/30/2021

Reverse Proxy, HTTP Keep-Alive Timeout, and sporadic HTTP 502s

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This technical article investigates the root cause of sporadic HTTP 502 (Bad Gateway) errors in web architectures using reverse proxies. It explains how a TCP race condition, stemming from mismatched HTTP Keep-Alive timeout settings between the proxy and upstream servers, can lead to clients receiving intermittent 502 responses. The author shares debugging experiences from AWS ALB and Traefik setups, offering a summary of the distributed systems problem inherent in TCP connections.

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#Reverse Proxy #Timeout #HTTP Keep Alive
Reverse Proxy, HTTP Keep-Alive Timeout, and sporadic HTTP 502s

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