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ref(cloudflare): Use the shared request handler wrapper - #25588

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@isaacs isaacs commented Oct 20, 2026 •

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Moves Cloudflare's wrapRequestHandler onto wrapServerRequestHandler, which Deno.serve and Bun.serve use since the previous PRs. Cloudflare keeps only what is unique to it: client init, the cf and cloud resource contexts, the protocol from cf.httpProtocol, the isStreamingResponse option, captureErrors, and the flush through waitUntil, which skips the dispose for a 101 response. The helpers that only the old code used (captureIncomingRequestBody, shouldCreateIncomingRequestSpan, getIncomingRequestSpanHooks and addRequest) are gone.

wrapRequestHandler must run on workers without the nodejs_compat flag, such as Shopify Oxygen, and every @sentry/server-utils entry loads node:async_hooks. So the wrapper moves to a new entry, @sentry/server-utils/request-handler, with no Node.js imports. Deno and Bun import it from there too. Cloudflare's module graph test allows this one entry, and a new test in server-utils walks the entry's module graph and fails on any Node.js import.

The wrapper gets three optional fields: isStreamingResponse, onDone (called once when the request is done, with the response if there is one), and a mechanism that can be left out to not capture errors.

For streamed responses, the shared stream monitor replaces Cloudflare's TransformStream. Workers with a compatibility date before 2022-11-30 cannot construct a ReadableStream without the streams_enable_constructors flag, so the wrapper then ends at handler return, as the TransformStream fallback did. The monitor now locks the source body only in start(), so the original response stays usable in that case. The wrapper builds the new response from the original one, which keeps encodeBody: 'manual'.

Visible changes for Cloudflare:

  • Request spans set client.address from CF-Connecting-IP (or another forwarding header), as on the other runtimes. This follows dataCollection.userInfo, which is true by default.
  • Request spans get the response header attributes, and events get the response context.
  • An error from the source of a streamed response is captured (unless captureErrors is false), and the span gets an error status.
  • If the user removed httpServerIntegration, request bodies follow dataCollection.httpBodies. Before, the SDK attached no body.

The minified withSentry bundle grows by about 2.4 KB (212,385 to 214,853 bytes), under the 211 KiB limit. Most of it is the request session and client address code, which Cloudflare now shares.

Fixes #25577
Fixes JS-3975

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JS-3975

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isaacs added this pull request to stack #25589 October 20, 2026 22:30

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Comment thread packages/cloudflare/src/wrapRequestHandlerWithInit.ts
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size-limit report 📦

Compared: 4df28b2 (PR test merge using develop at af44640)

Against: 3ea9dc3 (develop) · base run #63478

⚠️ Baseline mismatch: 16 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 af44640 finishes.

Path Size % Change Change
@sentry/browser 29.98 kB - -
@sentry/browser - with treeshaking flags 28.13 kB - -
@sentry/browser - with treeshaking flags tracing without tracing 28.03 kB - -
@sentry/browser (incl. Tracing) 52.17 kB - -
@sentry/browser (incl. Tracing + Span Streaming) 52.18 kB - -
@sentry/browser (incl. Tracing, Profiling) 55.12 kB - -
@sentry/browser (incl. Tracing, Replay) 91.97 kB - -
@sentry/browser (incl. Tracing, Replay) - with treeshaking flags 80.86 kB - -
@sentry/browser (incl. Tracing, Replay with Canvas) 96.7 kB - -
@sentry/browser (incl. Tracing, Replay, Feedback) 109.64 kB - -
@sentry/browser (incl. Feedback) 47.51 kB - -
@sentry/browser (incl. sendFeedback) 35.05 kB - -
@sentry/browser (incl. FeedbackAsync) 40.15 kB - -
@sentry/browser (incl. Metrics) 31.01 kB - -
@sentry/browser (incl. Logs) 31.28 kB - -
@sentry/browser (incl. Metrics & Logs) 31.94 kB - -
@sentry/react 31.81 kB - -
@sentry/react (incl. Tracing) 54.5 kB - -
@sentry/vue 38.14 kB - -
@sentry/vue (incl. Tracing) 55.11 kB - -
@sentry/svelte 30.01 kB - -
@sentry/remix (Remix 3 client bundle) 57.19 kB - -
CDN Bundle 31.76 kB - -
CDN Bundle (incl. Tracing) 52.71 kB - -
CDN Bundle (incl. Logs, Metrics) 33.95 kB - -
CDN Bundle (incl. Tracing, Logs, Metrics) 54.66 kB - -
CDN Bundle (incl. Replay, Logs, Metrics) 74.93 kB - -
CDN Bundle (incl. Tracing, Replay) 90.41 kB - -
CDN Bundle (incl. Tracing, Replay, Logs, Metrics) 92.33 kB - -
CDN Bundle (incl. Tracing, Replay, Feedback) 96.55 kB - -
CDN Bundle (incl. Tracing, Replay, Feedback, Logs, Metrics) 98.5 kB - -
CDN Bundle - uncompressed 93.51 kB - -
CDN Bundle (incl. Tracing) - uncompressed 156.36 kB - -
CDN Bundle (incl. Logs, Metrics) - uncompressed 100.06 kB - -
CDN Bundle (incl. Tracing, Logs, Metrics) - uncompressed 162.33 kB - -
CDN Bundle (incl. Replay, Logs, Metrics) - uncompressed 230.28 kB - -
CDN Bundle (incl. Tracing, Replay) - uncompressed 276.71 kB - -
CDN Bundle (incl. Tracing, Replay, Logs, Metrics) - uncompressed 282.66 kB - -
CDN Bundle (incl. Tracing, Replay, Feedback) - uncompressed 290.41 kB - -
CDN Bundle (incl. Tracing, Replay, Feedback, Logs, Metrics) - uncompressed 296.35 kB - -
@sentry/nextjs (client) 57.38 kB - -
@sentry/sveltekit (client) 52.55 kB - -
@sentry/core/server 43.62 kB - -
@sentry/core/browser 13.81 kB - -
@sentry/node 153.93 kB +0.13% +186 B 🔺
@sentry/node/import (ESM hook with diagnostics-channel injection) 81.58 kB - -
@sentry/node - without tracing 95.48 kB +0.18% +165 B 🔺
@sentry/node - without channel injection 134.59 kB +0.15% +190 B 🔺
@sentry/aws-serverless 103.61 kB +0.15% +148 B 🔺
@sentry/cloudflare (withSentry) - minified 199.87 kB +2.23% +4.35 kB 🔺
@sentry/cloudflare (withSentry) 496.88 kB +2.17% +10.51 kB 🔺
@sentry/nextjs/cloudflare (withSentry) - minified 220.44 kB +1.98% +4.26 kB 🔺

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isaacs force-pushed the isaacschlueter/js-3975-share-one-request-handler-wrapper-across-denoserve-bunserve-c branch from fc30522 to 5d3ee29 Compare October 21, 2026 01:06
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isaacs marked this pull request as ready for review October 21, 2026 01:07
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isaacs force-pushed the isaacschlueter/js-3975-share-one-request-handler-wrapper-across-denoserve-bunserve-c branch from 5d3ee29 to 7a1874d Compare October 21, 2026 01:07
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isaacs requested a review from a team as a code owner October 21, 2026 01:13
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isaacs requested review from chargome and nicohrubec and removed request for a team October 21, 2026 01:13
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isaacs force-pushed the isaacschlueter/js-3975-share-one-request-handler-wrapper-across-denoserve-bunserve-c branch from 7a1874d to 9e86e46 Compare October 21, 2026 01:13
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isaacs force-pushed the isaacschlueter/js-3975-share-one-request-handler-wrapper-across-denoserve-bunserve-c branch 2 times, most recently from a650894 to 66b9312 Compare October 21, 2026 01:20

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isaacs force-pushed the isaacschlueter/js-3975-share-one-request-handler-wrapper-across-denoserve-bunserve-c branch from a1a478b to f0da1bc Compare October 21, 2026 04:14
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isaacs force-pushed the isaacschlueter/js-3975-share-one-request-handler-wrapper-across-denoserve-bunserve-c branch from f0da1bc to 128c6ee Compare October 21, 2026 17:15

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

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isaacs force-pushed the isaacschlueter/js-3975-share-one-request-handler-wrapper-across-denoserve-bunserve-c branch from 128c6ee to 411a6ac Compare October 21, 2026 17:28
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Optional E2E tests

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@isaacs
isaacs force-pushed the isaacschlueter/js-3975-share-one-request-handler-wrapper-across-denoserve-bunserve-c branch from 411a6ac to a18c1c2 Compare October 21, 2026 18:35
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isaacs force-pushed the isaacschlueter/js-3975-share-one-request-handler-wrapper-across-denoserve-bunserve-c branch from a18c1c2 to f81ddfd Compare October 21, 2026 18:37
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isaacs force-pushed the isaacschlueter/js-3975-share-one-request-handler-wrapper-across-denoserve-bunserve-c branch 2 times, most recently from 14b8f95 to 9ff7d48 Compare October 22, 2026 15:37
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isaacs force-pushed the isaacschlueter/js-3975-share-one-request-handler-wrapper-across-denoserve-bunserve-c branch 3 times, most recently from 1cc3a5e to c731f41 Compare October 23, 2026 18:38
isaacs and others added 2 commits October 23, 2026 13:54
Moves Cloudflare's `wrapRequestHandler` onto `wrapServerRequestHandler`,
which `Deno.serve` and `Bun.serve` use since the previous PRs. Cloudflare
keeps only what is unique to it: client init, the `cf` and cloud
resource contexts, the protocol from `cf.httpProtocol`, the
`isStreamingResponse` option, `captureErrors`, and the flush through
`waitUntil`, which skips the dispose for a 101 response. The helpers
that only the old code used (`captureIncomingRequestBody`,
`shouldCreateIncomingRequestSpan`, `getIncomingRequestSpanHooks` and
`addRequest`) are gone.

`wrapRequestHandler` must run on workers without the `nodejs_compat`
flag, such as Shopify Oxygen, and every `@sentry/server-utils` entry
loads `node:async_hooks`. So the wrapper moves to a new entry,
`@sentry/server-utils/request-handler`, with no Node.js imports. Deno
and Bun import it from there too. Cloudflare's module graph test allows
this one entry, and a new test in server-utils walks the entry's module
graph and fails on any Node.js import.

The wrapper gets three optional fields: `isStreamingResponse`, `onDone`
(called once when the request is done, with the response if there is
one), and a `mechanism` that can be left out to not capture errors.

For streamed responses, the shared stream monitor replaces Cloudflare's
`TransformStream`. Workers with a compatibility date before 2022-11-30
cannot construct a `ReadableStream` without the
`streams_enable_constructors` flag, so the wrapper then ends at handler
return, as the `TransformStream` fallback did. The monitor now locks the
source body only in `start()`, so the original response stays usable in
that case. The wrapper builds the new response from the original one,
which keeps `encodeBody: 'manual'`.

Visible changes for Cloudflare:

- Request spans set `client.address` from `CF-Connecting-IP` (or
  another forwarding header), as on the other runtimes. This follows
  `dataCollection.userInfo`, which is `true` by default.
- Request spans get the response header attributes, and events get the
  `response` context.
- An error from the source of a streamed response is captured (unless
  `captureErrors` is `false`), and the span gets an error status.
- If the user removed `httpServerIntegration`, request bodies follow
  `dataCollection.httpBodies`. Before, the SDK attached no body.

The minified `withSentry` bundle grows by about 2.4 KB (212,385 to
214,853 bytes), under the 211 KiB limit. Most of it is the request
session and client address code, which Cloudflare now shares.

Fixes #25577
Fixes JS-3975

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
…ncLocalStorage

Without `AsyncLocalStorage` (for example on Shopify Oxygen, or on
Workers without `nodejs_compat`), the SDK uses the stack fallback, and
`withInvocationIsolationScope` does not fork. The scope it passes to its
callback is a clone that is not the current isolation scope. The shared
request handler wrote the request data and body to that clone, so an
event captured in the handler, which reads the current scope, had no
request body. The `hydrogen-react-router-7` E2E test caught this.

The handler now gets the current isolation scope. With
`AsyncLocalStorage`, that is the same scope as before. Without it, the
request data goes where the body went before the move to the shared
handler, and events now also get the request URL and method.

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
@isaacs
isaacs force-pushed the isaacschlueter/js-3975-share-one-request-handler-wrapper-across-denoserve-bunserve-c branch from c731f41 to 07870f8 Compare October 23, 2026 20:54

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Share one  Request  handler wrapper across Deno.serve, Bun.serve and Cloudflare

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