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Why NGINX Request Time and Upstream Time Diverge
Subtracting $upstream_response_time from $request_time does not reveal a single hidden NGINX phase. The two clocks have different boundaries. Request time follows the…
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6 articlesArticles & guides
Security
Your TLS Certificate Renewed, but the Old One Is Still Live
A successful renewal proves that a certificate authority issued a new certificate and that some file or certificate store changed. It does…
DevOps
nginx 499 Means the Client Left Before the Server Replied
An nginx access log records status 499 when the downstream client closes its connection before nginx can finish the response. The number…
DevOps
HAProxy Backend DOWN: Separate Probe Failure from Service Failure
HAProxy marks a backend server DOWN when its configured health-check contract fails often enough. That result does not, by itself, prove the…
Security
Keycloak Login Redirects Break Behind a Reverse Proxy
Broken Keycloak redirects behind a TLS-terminating reverse proxy usually mean that three URL owners disagree: Keycloak's public hostname, the proxy's forwarded request…
DevOps
Caddy Reverse Proxy Reloads Without VPS Downtime
Quick answer: put Caddy on public ports 80 and 443, keep the application on a loopback address such as 127.0.0.1:3000, and leave…
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