Project / Service: VyaparX (vyaparx) — domain www.getvyaparx.com, Railway region asia-southeast1-eqsg3a Time window: 2026-04-25, ~10:11–10:12 UTC

Summary

About half my requests to https://www.getvyaparx.com/health take ~12s, the rest take <0.5s. I instrumented the Node /health endpoint to log when the request actually reaches the container. The data shows the 12s is spent before Node receives the request — every slow hit has an ~11.8s gap between client send and server receive, and Node always responds within 0.3s. Same instanceId on all hits, so it's not a multi-replica issue.

Evidence (5 consecutive hits, same client, same container 741506ab-2d0d-477c-a7da-69d3c9b3a9ec)

hit client_sent (UTC) server_received (UTC) pre-Node gap total

1 10:11:44.938 10:11:45.100 0.16 s 0.46 s

2 10:11:46.162 10:11:57.960 11.80 s 12.15 s

3 10:11:59.021 10:11:58.826 ~0 s 0.16 s

4 10:11:59.873 10:12:11.676 11.80 s 12.16 s

5 10:12:12.722 10:12:24.555 11.83 s 12.19 s

server_received is new Date().toISOString() at the very start of the Express handler. total is curl's time_total. The 11.8s is reproducible and consistent — feels like a TCP connection timeout + retry firing on the Fastly→origin path, not random network jitter.

Notes:

- TCP connect + TLS handshake is always ~80ms (fast).

- All slow time is in time_starttransfer.

- Your dashboard reports origin healthy (p50 1.1s, p95 1.9s) — your metrics don't see these because they only count requests that actually arrive.

- HTTP/1.0 reproduces it (so not a keep-alive issue).

- All paths reproduce (/health, /clinic/odontocare, /admin/templates).

- Single replica only — confirmed by instance ID being identical across all hits.

What I need

Please look at the Fastly edge → Railway origin path for service vyaparx in asia-southeast1. Specifically the connection between your edge proxy and the container during 10:11–10:12 UTC on 2026-04-25. The ~11.8s pattern strongly suggests a connection-timeout retry loop somewhere in your infrastructure.

Repo (in case you want to inspect): https://github.com/rajdeori2019/vyaparx

The diagnostic /health handler is at src/server.js:221.