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HTTP_E_STATUS_GATEWAY_TIMEOUT
HTTP_E_STATUS_GATEWAY_TIMEOUT maps to HTTP 504 Gateway Timeout. A server acting as a gateway or proxy did not receive a timely response from the upstream server it needed to contact.
What to check
- Identify which hop generated the response by inspecting gateway headers, logs, and request IDs.
- Compare client, load balancer, reverse-proxy, and application timeout budgets; the shortest limit often determines the observed failure.
- Check upstream latency, connection-pool exhaustion, DNS resolution, TLS handshakes, and dependency timeouts.
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