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feat(nuxt, nitro): Serve the managed tunnel before the app's server middleware - #25418

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@logaretm logaretm commented Oct 15, 2026 •

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A Nitro app's own server/middleware, like an auth check, ran before anything Sentry registered and would block tunnel requests, fixed by putting the tunnel check first in h3's middleware on Nitro v3 and answering from the request hook on Nitro v2.

This is the one framework PR where the ordering matters, so worth a closer look. Nuxt picks the right plugin based on the Nitro version, and the base path comes from Nitro's baseURL.

The e2e tunnel variants for Nuxt 4, Nuxt 5 and Nitro 3 check that the tunnel answers while an auth middleware rejects every other POST.

For reviewers: if you need an overview of what this is, refer to #25199.

closes #20254

@logaretm
logaretm added this pull request to stack #25201 October 15, 2026 15:51
Comment thread packages/nuxt/src/runtime/plugins/tunnel-legacy.server.ts Outdated
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size-limit report 📦

Compared: 7f16112 (PR test merge using develop at 5f03422)

Against: ca4fc32 (develop) · base run #62950

⚠️ Baseline mismatch: 79 develop commit(s) in the PR build are missing from the baseline. Their size changes also affect this comparison. Compare commits. Re-run once develop's baseline build for 5f03422 finishes.

Path Size % Change Change
@sentry/browser 30.56 kB +2.18% +651 B 🔺
@sentry/browser - with treeshaking flags 28.54 kB +1.76% +491 B 🔺
@sentry/browser - with treeshaking flags tracing without tracing 28.42 kB +1.69% +470 B 🔺
@sentry/browser (incl. Tracing) 52.8 kB +1.35% +702 B 🔺
@sentry/browser (incl. Tracing + Span Streaming) 52.8 kB +1.35% +699 B 🔺
@sentry/browser (incl. Tracing, Profiling) 55.77 kB +1.31% +720 B 🔺
@sentry/browser (incl. Tracing, Replay) 92.47 kB +0.68% +621 B 🔺
@sentry/browser (incl. Tracing, Replay) - with treeshaking flags 81.21 kB +0.61% +492 B 🔺
@sentry/browser (incl. Tracing, Replay with Canvas) 97.21 kB +0.66% +633 B 🔺
@sentry/browser (incl. Tracing, Replay, Feedback) 110.2 kB +0.63% +687 B 🔺
@sentry/browser (incl. Feedback) 48.12 kB +1.49% +703 B 🔺
@sentry/browser (incl. sendFeedback) 35.63 kB +1.9% +664 B 🔺
@sentry/browser (incl. FeedbackAsync) 40.76 kB +1.71% +684 B 🔺
@sentry/browser (incl. Metrics) 31.57 kB +2.05% +634 B 🔺
@sentry/browser (incl. Logs) 31.84 kB +2.02% +629 B 🔺
@sentry/browser (incl. Metrics & Logs) 32.52 kB +2.12% +673 B 🔺
@sentry/react 32.37 kB +1.99% +630 B 🔺
@sentry/react (incl. Tracing) 55.05 kB +1.17% +635 B 🔺
@sentry/vue 38.71 kB +1.7% +646 B 🔺
@sentry/vue (incl. Tracing) 55.75 kB +1.3% +715 B 🔺
@sentry/svelte 30.59 kB +2.2% +656 B 🔺
@sentry/remix (Remix 3 client bundle) 57.84 kB +1.27% +722 B 🔺
CDN Bundle 32.14 kB +1.5% +474 B 🔺
CDN Bundle (incl. Tracing) 53.09 kB +0.92% +480 B 🔺
CDN Bundle (incl. Logs, Metrics) 34.34 kB +1.4% +471 B 🔺
CDN Bundle (incl. Tracing, Logs, Metrics) 55.04 kB +0.89% +484 B 🔺
CDN Bundle (incl. Replay, Logs, Metrics) 75.29 kB +0.67% +499 B 🔺
CDN Bundle (incl. Tracing, Replay) 90.75 kB +0.53% +476 B 🔺
CDN Bundle (incl. Tracing, Replay, Logs, Metrics) 92.69 kB +0.52% +479 B 🔺
CDN Bundle (incl. Tracing, Replay, Feedback) 96.89 kB +0.49% +470 B 🔺
CDN Bundle (incl. Tracing, Replay, Feedback, Logs, Metrics) 98.86 kB +0.5% +486 B 🔺
CDN Bundle - uncompressed 94.44 kB +1.24% +1.15 kB 🔺
CDN Bundle (incl. Tracing) - uncompressed 157.29 kB +0.74% +1.15 kB 🔺
CDN Bundle (incl. Logs, Metrics) - uncompressed 100.99 kB +1.16% +1.15 kB 🔺
CDN Bundle (incl. Tracing, Logs, Metrics) - uncompressed 163.26 kB +0.72% +1.15 kB 🔺
CDN Bundle (incl. Replay, Logs, Metrics) - uncompressed 231.03 kB +0.51% +1.15 kB 🔺
CDN Bundle (incl. Tracing, Replay) - uncompressed 277.46 kB +0.42% +1.15 kB 🔺
CDN Bundle (incl. Tracing, Replay, Logs, Metrics) - uncompressed 283.42 kB +0.41% +1.15 kB 🔺
CDN Bundle (incl. Tracing, Replay, Feedback) - uncompressed 291.16 kB +0.4% +1.15 kB 🔺
CDN Bundle (incl. Tracing, Replay, Feedback, Logs, Metrics) - uncompressed 297.11 kB +0.39% +1.15 kB 🔺
@sentry/nextjs (client) 57.91 kB +1.05% +601 B 🔺
@sentry/sveltekit (client) 53.29 kB +1.55% +812 B 🔺
@sentry/core/server 43.52 kB +4.13% +1.73 kB 🔺
@sentry/core/browser 13.81 kB - -
@sentry/node 153.28 kB +0.44% +658 B 🔺
@sentry/node/import (ESM hook with diagnostics-channel injection) 81.58 kB - -
@sentry/node - without tracing 94.9 kB +0.69% +649 B 🔺
@sentry/node - without channel injection 133.91 kB +0.46% +613 B 🔺
@sentry/aws-serverless 103.15 kB +0.7% +710 B 🔺
@sentry/cloudflare (withSentry) - minified 213.13 kB +0.96% +2.02 kB 🔺
@sentry/cloudflare (withSentry) 528.73 kB +0.94% +4.9 kB 🔺
@sentry/nextjs/cloudflare (withSentry) - minified 232.75 kB +0.88% +2.01 kB 🔺

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@logaretm
logaretm force-pushed the awad/tunnel-nitro branch 2 times, most recently from 9765090 to 9bad613 Compare October 15, 2026 17:15
@logaretm
logaretm force-pushed the awad/tunnel-nitro branch 2 times, most recently from c1733f2 to fdca10d Compare October 15, 2026 17:44
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bugbot run

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Stale Bugbot comment from a previous run.

@logaretm
logaretm force-pushed the awad/tunnel-nitro branch 2 times, most recently from 3596b0a to ec58ad6 Compare October 16, 2026 04:23
@logaretm
logaretm marked this pull request as ready for review October 19, 2026 19:36
@logaretm
logaretm requested a review from a team as a code owner October 19, 2026 19:36
@logaretm
logaretm requested review from mydea and s1gr1d and removed request for a team October 19, 2026 19:36

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Stale Bugbot comment from a previous run.

Comment thread dev-packages/e2e-tests/test-applications/nitro-3/tests/tunnel.test.ts Outdated
Comment thread packages/nuxt/test/common/tunnel.test.ts
@logaretm
logaretm requested review from a team as code owners October 19, 2026 20:08
@logaretm
logaretm requested review from JPeer264 and Lms24 and removed request for a team October 19, 2026 20:08

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Cursor Bugbot has reviewed your changes and found 1 potential issue.

Fix All in Cursor

❌ Bugbot Autofix is OFF. To automatically fix reported issues with cloud agents, enable autofix in the Cursor dashboard.

Reviewed by Cursor Bugbot for commit eaaa873. Configure here.

// up a `NUXT_APP_BASE_URL` set at runtime.
setManagedTunnelDefaults({ basePath: (useRuntimeConfig() as { app?: { baseURL?: string } }).app?.baseURL });
const appFetch = nitroApp.fetch;
nitroApp.fetch = request => handleTunnelRequestIfMatched(request) ?? appFetch(request);

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Tunnel runs before Cloudflare client

Medium Severity

On Nitro v3 the managed tunnel now answers from a nitroApp.fetch wrapper, which is the worker entry. handleTunnelRequestIfMatched reads the active client, but sentryCloudflareNitroPlugin still installs that client inside localFetch. Tunnel POSTs can miss the match and fall through to app middleware, so the Cloudflare path this branch is meant to cover never serves the tunnel.

Additional Locations (2)
Fix in Cursor Fix in Web

Reviewed by Cursor Bugbot for commit eaaa873. Configure here.

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One or more gzipped bundles increased by more than 500 bytes. If this increase is intentional, add the Accept Bundlesize Increase label to this PR to rerun and accept the check.

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…iddleware

On Nitro v3, Nuxt and `@sentry/nitro` put the tunnel check first in h3's
middleware list, since Nitro runs the app's `server/middleware` before anything a
module registers and has no public way to go first. On Nitro v2, Nuxt answers
from the `request` hook.
`nuxt dev` opens the port before it can serve and answers 503 until then, while Playwright only waits for the port.

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Nuxt and Nitro managed tunnel

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