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feat: Accept tunnel: true in init to enable the managed tunnel - #25200

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logaretm wants to merge 16 commits into
awad/tunnel-core-dsn-pathfrom
awad/tunnel-browser-managed
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awad/tunnel-core-dsn-pathfrom
awad/tunnel-browser-managed

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@logaretm

@logaretm logaretm commented Oct 8, 2026 •

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Previously the client side only accepted a string tunnel option so it sent the requests to that fixed endpoint, this PR effectively adds "managed" tunnel support that is generated automatically from the provided DSN.

This PR adds the tunnel options to the SDKs's init options and implements the client transport if the tunnel is provided.

On the server side the runtime SDKs only translate tunnel: true into the internal _managedTunnel option, answering the requests is left to the meta-frameworks in the rest of the stack.

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

closes #25460

@logaretm
logaretm added this pull request to stack #25201 October 8, 2026 15:45
@logaretm
logaretm force-pushed the awad/tunnel-browser-managed branch from ec2da8d to 2933944 Compare October 8, 2026 16:05
@logaretm logaretm changed the title feat(browser): Add applyManagedTunnel to point the tunnel at the DSN-derived path feat: Accept tunnel: true in init to enable the managed tunnel Oct 8, 2026
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size-limit report 📦

Compared: 3a5171f (PR test merge using develop at 8c4491d)

Against: ca4fc32 (develop) · base run #62950

⚠️ Baseline mismatch: 34 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 8c4491d 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) 53.11 kB +1.21% +634 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% +659 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 133.92 kB +0.47% +616 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-browser-managed branch from 2933944 to 4837dc0 Compare October 15, 2026 14:38
@logaretm
logaretm force-pushed the awad/tunnel-browser-managed branch 2 times, most recently from d5c110f to 4ab6297 Compare October 15, 2026 14:44
@logaretm
logaretm force-pushed the awad/tunnel-browser-managed branch from 4ab6297 to bf1d62c Compare October 15, 2026 14:47
@logaretm
logaretm force-pushed the awad/tunnel-browser-managed branch 3 times, most recently from 75a299e to b1553a8 Compare October 15, 2026 15:36
@logaretm
logaretm force-pushed the awad/tunnel-browser-managed branch from b1553a8 to 0e573ca Compare October 15, 2026 15:51
@logaretm logaretm changed the title feat: Accept tunnel: true in init to enable the managed tunnel feat: Accept tunnel: true in the SDKs that serve the managed tunnel Oct 15, 2026
@logaretm
logaretm force-pushed the awad/tunnel-browser-managed branch from 1d77f74 to 80f1700 Compare October 15, 2026 17:15
@logaretm logaretm changed the title feat: Accept tunnel: true in the SDKs that serve the managed tunnel feat: Accept tunnel: true in init to enable the managed tunnel Oct 15, 2026
@logaretm
logaretm force-pushed the awad/tunnel-browser-managed branch 4 times, most recently from a769b10 to d79df66 Compare October 15, 2026 18:28
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bugbot run

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Stale Bugbot comment from a previous run.

Comment thread packages/core/src/client.ts Outdated
Comment thread packages/browser/src/utils/managedTunnel.ts
@logaretm
logaretm force-pushed the awad/tunnel-browser-managed branch from d79df66 to 8717465 Compare October 16, 2026 01:51
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@mydea

mydea commented Oct 21, 2026

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@logaretm could you go into more detail what a managed tunnel is/means, it is not quite clear to me what exactly this PR actually does 😅 is this meant to be used by users, or only by us internally, ...?

@logaretm

logaretm commented Oct 21, 2026 •

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@mydea the overview is in the base PR explaining how does all of this work, I didn't want to repeat it in each PR.

I think it is better to review this in order one by one.

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logaretm requested a review from andreiborza October 21, 2026 15:30
@logaretm
logaretm force-pushed the awad/tunnel-browser-managed branch from 21acf22 to aeb40b0 Compare October 21, 2026 15:35
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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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logaretm force-pushed the awad/tunnel-browser-managed branch from aee0a31 to 3d0e344 Compare October 22, 2026 15:07

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Comment thread packages/browser/src/sdk.ts
Setting `tunnel: true` (or `{ allowedDsns, basePath, trailingSlash }`) in both
the browser and the server `init` enables the managed tunnel. The browser
resolves it to the DSN-derived same-origin path and sends envelopes as
`application/x-sentry-envelope`, because SvelteKit and Astro CSRF checks reject
a same-origin `text/plain` POST. Server SDKs keep their own envelopes going
directly to Sentry and set `_managedTunnel` for their request handlers.
With `debug: true`, the client warns once when a managed tunnel request gets a
403, 404 or 405, pointing at the server side: a meta-framework SDK, an endpoint
calling `handleTunnelRequest`, or `allowedDsns`.
…port, and import server helpers from core/server

Only the browser sends to a managed tunnel, so the warning moves from the shared Client into the browser's tunnel transport. Server SDKs import resolveServerTunnelOption from @sentry/core/server.
The reason strings were built in production bundles too, while only the debug warning that printed them was stripped.
…nel tests

`isTunnelRequest` only reads the active server client now, and the paths are already checked against `getTunnelPath`.

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Managed tunnel in core and browser

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