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✅ delay /empty.css response to fix WebKit early-timings flake #4631

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Merged
thomas-lebeau merged 1 commit into from
May 20, 2026
+5 −1
Merged

✅ delay /empty.css response to fix WebKit early-timings flake #4631

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6 changes: 5 additions & 1 deletion test/e2e/lib/framework/serverApps/mock.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -89,7 +89,11 @@ export function createMockServerApp(servers: Servers, setup: string, setupOption
})

app.get('/empty.css', (_req, res) => {
res.header('content-type', 'text/css').end()
// 50ms delay: WebKit clamps PerformanceResourceTiming timestamps to 1ms. Without a delay,
// a zero-byte response on fast (Linux CI) loopback occasionally completes within a single
// tick, collapsing every timestamp to the same value and making the SDK report duration: 0
// — which made `rum resources › retrieve early requests timings` the top flaky E2E this week.
setTimeout(() => res.header('content-type', 'text/css').end(), 50)
})

app.get('/flush', (_req, res) => {
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