feat(remix): Propagate the server trace to Remix 3 page loads by chargome · Pull Request #25145 · getsentry/sentry-javascript · GitHub

Browser page loads in Remix 3 started a new trace. The server middleware now adds sentry-trace and baggage entries to the Server-Timing header of HTML responses, ahead of the route entry, the same channel the Remix 2 SDK and Nitro use. The browser SDK already reads both off the navigation timing entry for page loads, so no client change is needed.

A response a shared cache may store (public, s-maxage, or a positive max-age without private/no-store) carries the route entry only: a cached document would otherwise hand one request's trace to every later page load, the ISR problem the Next.js SDK works around on the client.

The e2e test asserts that the page load span shares the server span's trace id and has it as parent.

Fixes #25137

Page loads started a new trace. The middleware now adds `sentry-trace` and `baggage` entries to the `Server-Timing` header of HTML responses, ahead of the route entry, the way the Remix 2 SDK and Nitro do. The browser SDK already reads them off the navigation timing entry for page loads, so no client change. Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>

bugbot run

JS-3889

size-limit report 📦

Path	Size	% Change	Change
@sentry/browser	29.8 kB	-	-
@sentry/browser - with treeshaking flags	27.92 kB	-	-
@sentry/browser - with treeshaking flags tracing without tracing	27.84 kB	-	-
@sentry/browser (incl. Tracing)	51.85 kB	-	-
@sentry/browser (incl. Tracing + Span Streaming)	51.87 kB	-	-
@sentry/browser (incl. Tracing, Profiling)	54.8 kB	-	-
@sentry/browser (incl. Tracing, Replay)	91.58 kB	-	-
@sentry/browser (incl. Tracing, Replay) - with treeshaking flags	80.45 kB	-	-
@sentry/browser (incl. Tracing, Replay with Canvas)	96.29 kB	-	-
@sentry/browser (incl. Tracing, Replay, Feedback)	109.27 kB	-	-
@sentry/browser (incl. Feedback)	47.32 kB	-	-
@sentry/browser (incl. sendFeedback)	34.84 kB	-	-
@sentry/browser (incl. FeedbackAsync)	39.95 kB	-	-
@sentry/browser (incl. Metrics)	30.82 kB	-	-
@sentry/browser (incl. Logs)	31.11 kB	-	-
@sentry/browser (incl. Metrics & Logs)	31.75 kB	-	-
@sentry/react	31.63 kB	-	-
@sentry/react (incl. Tracing)	54.17 kB	-	-
@sentry/vue	37.84 kB	-	-
@sentry/vue (incl. Tracing)	54.78 kB	-	-
@sentry/svelte	29.83 kB	-	-
@sentry/remix (Remix 3 client bundle)	56.83 kB	-	-
CDN Bundle	31.53 kB	-	-
CDN Bundle (incl. Tracing)	52.34 kB	-	-
CDN Bundle (incl. Logs, Metrics)	33.72 kB	-	-
CDN Bundle (incl. Tracing, Logs, Metrics)	54.3 kB	-	-
CDN Bundle (incl. Replay, Logs, Metrics)	74.65 kB	-	-
CDN Bundle (incl. Tracing, Replay)	90.01 kB	-	-
CDN Bundle (incl. Tracing, Replay, Logs, Metrics)	91.96 kB	-	-
CDN Bundle (incl. Tracing, Replay, Feedback)	96.17 kB	-	-
CDN Bundle (incl. Tracing, Replay, Feedback, Logs, Metrics)	98.15 kB	-	-
CDN Bundle - uncompressed	92.92 kB	-	-
CDN Bundle (incl. Tracing) - uncompressed	155.46 kB	-	-
CDN Bundle (incl. Logs, Metrics) - uncompressed	99.46 kB	-	-
CDN Bundle (incl. Tracing, Logs, Metrics) - uncompressed	161.41 kB	-	-
CDN Bundle (incl. Replay, Logs, Metrics) - uncompressed	229.5 kB	-	-
CDN Bundle (incl. Tracing, Replay) - uncompressed	275.63 kB	-	-
CDN Bundle (incl. Tracing, Replay, Logs, Metrics) - uncompressed	281.57 kB	-	-
CDN Bundle (incl. Tracing, Replay, Feedback) - uncompressed	289.33 kB	-	-
CDN Bundle (incl. Tracing, Replay, Feedback, Logs, Metrics) - uncompressed	295.26 kB	-	-
@sentry/nextjs (client)	56.53 kB	-	-
@sentry/sveltekit (client)	52.23 kB	-	-
@sentry/core/server	40.86 kB	-	-
@sentry/core/browser	13.71 kB	-	-
@sentry/node	145.89 kB	+0.01%	+7 B 🔺
@sentry/node/import (ESM hook with diagnostics-channel injection)	83.33 kB	-	-
@sentry/node - without tracing	93.69 kB	+0.01%	+8 B 🔺
@sentry/node - without channel injection	124.04 kB	+0.01%	+9 B 🔺
@sentry/aws-serverless	101.91 kB	+0.01%	+5 B 🔺
@sentry/cloudflare (withSentry) - minified	209.71 kB	-	-
@sentry/cloudflare (withSentry)	519.94 kB	-	-

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A shared cache would hand one request's trace to every later page load of the cached document. A response with `public`, `s-maxage` or a positive `max-age` and no `private`/`no-store` carries the route entry only, which is the same for every request to it. Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>

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…test Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>

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Without a lifetime in `Cache-Control`, a cache falls back to `Expires`, so a response with only a future `Expires` could still hand its trace to later page loads. Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>

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…guard A zero lifetime with `stale-while-revalidate` or `stale-if-error` is still served stale by a shared cache. A CDN reads `CDN-Cache-Control`, its vendor variants or `Surrogate-Control` instead of `Cache-Control`, so a document can be cacheable at the CDN while private to the browser. Any source that lets a shared cache reuse the response keeps the trace off it. Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>

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Reviewed by Cursor Bugbot for commit 645c9dd. Configure here.

chargome self-assigned this Oct 7, 2026

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chargome marked this pull request as ready for review October 8, 2026 08:20

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chargome requested review from JPeer264, nicohrubec and s1gr1d and removed request for a team and s1gr1d October 8, 2026 08:20

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chargome force-pushed the charlygomez/js-3889-propagate-the-server-trace-to-remix-3-page-loads branch from 007a44c to 9145130 Compare October 8, 2026 09:29

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ref(remix): Mock trace data with a hoisted mock fn in the middleware …

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…test Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>

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fix(remix): Treat a future Expires as shared-cacheable

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Without a lifetime in `Cache-Control`, a cache falls back to `Expires`, so a response with only a future `Expires` could still hand its trace to later page loads. Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>

chargome force-pushed the charlygomez/js-3889-propagate-the-server-trace-to-remix-3-page-loads branch from 9218444 to 3639a3f Compare October 8, 2026 11:09

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chargome merged commit e99e6e1 into develop Oct 8, 2026
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chargome deleted the charlygomez/js-3889-propagate-the-server-trace-to-remix-3-page-loads branch October 8, 2026 13:00

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publish: getsentry/sentry-javascript@11.6.0 getsentry/publish#9809

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Propagate the server trace to Remix 3 page loads #25137

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feat(remix): Propagate the server trace to Remix 3 page loads by chargome · Pull Request #25145 · getsentry/sentry-javascript · GitHub

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feat(remix): Propagate the server trace to Remix 3 page loads - #25145

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