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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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Stale Bugbot comment from a previous run.

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

Compared: bf68211 (PR test merge using develop at 7e6b8ea)

Against: f15e256 (develop) · base run #63142

⚠️ Baseline mismatch: 18 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 7e6b8ea finishes.

Path Size % Change Change
@sentry/browser 29.91 kB - -
@sentry/browser - with treeshaking flags 28.05 kB - -
@sentry/browser - with treeshaking flags tracing without tracing 27.95 kB - -
@sentry/browser (incl. Tracing) 52.1 kB - -
@sentry/browser (incl. Tracing + Span Streaming) 52.1 kB - -
@sentry/browser (incl. Tracing, Profiling) 55.05 kB - -
@sentry/browser (incl. Tracing, Replay) 91.85 kB - -
@sentry/browser (incl. Tracing, Replay) - with treeshaking flags 80.72 kB - -
@sentry/browser (incl. Tracing, Replay with Canvas) 96.58 kB - -
@sentry/browser (incl. Tracing, Replay, Feedback) 109.52 kB - -
@sentry/browser (incl. Feedback) 47.42 kB - -
@sentry/browser (incl. sendFeedback) 34.97 kB - -
@sentry/browser (incl. FeedbackAsync) 40.07 kB - -
@sentry/browser (incl. Metrics) 30.93 kB - -
@sentry/browser (incl. Logs) 31.21 kB - -
@sentry/browser (incl. Metrics & Logs) 31.84 kB - -
@sentry/react 31.74 kB - -
@sentry/react (incl. Tracing) 54.42 kB - -
@sentry/vue 38.07 kB - -
@sentry/vue (incl. Tracing) 55.03 kB - -
@sentry/svelte 29.93 kB - -
@sentry/remix (Remix 3 client bundle) 57.11 kB - -
CDN Bundle 31.67 kB - -
CDN Bundle (incl. Tracing) 52.61 kB - -
CDN Bundle (incl. Logs, Metrics) 33.87 kB - -
CDN Bundle (incl. Tracing, Logs, Metrics) 54.55 kB - -
CDN Bundle (incl. Replay, Logs, Metrics) 74.79 kB - -
CDN Bundle (incl. Tracing, Replay) 90.28 kB - -
CDN Bundle (incl. Tracing, Replay, Logs, Metrics) 92.21 kB - -
CDN Bundle (incl. Tracing, Replay, Feedback) 96.42 kB - -
CDN Bundle (incl. Tracing, Replay, Feedback, Logs, Metrics) 98.37 kB - -
CDN Bundle - uncompressed 93.29 kB - -
CDN Bundle (incl. Tracing) - uncompressed 156.14 kB - -
CDN Bundle (incl. Logs, Metrics) - uncompressed 99.84 kB - -
CDN Bundle (incl. Tracing, Logs, Metrics) - uncompressed 162.11 kB - -
CDN Bundle (incl. Replay, Logs, Metrics) - uncompressed 229.88 kB - -
CDN Bundle (incl. Tracing, Replay) - uncompressed 276.31 kB - -
CDN Bundle (incl. Tracing, Replay, Logs, Metrics) - uncompressed 282.26 kB - -
CDN Bundle (incl. Tracing, Replay, Feedback) - uncompressed 290.01 kB - -
CDN Bundle (incl. Tracing, Replay, Feedback, Logs, Metrics) - uncompressed 295.96 kB - -
@sentry/nextjs (client) 57.31 kB - -
@sentry/sveltekit (client) 52.48 kB - -
@sentry/core/server 41.85 kB - -
@sentry/core/browser 13.81 kB - -
@sentry/node 153.16 kB +0.14% +206 B 🔺
@sentry/node/import (ESM hook with diagnostics-channel injection) 81.58 kB - -
@sentry/node - without tracing 94.71 kB +0.15% +141 B 🔺
@sentry/node - without channel injection 133.79 kB +0.15% +194 B 🔺
@sentry/aws-serverless 102.92 kB +0.18% +179 B 🔺
@sentry/cloudflare (withSentry) - minified 196.6 kB +2.23% +4.29 kB 🔺
@sentry/cloudflare (withSentry) 487.83 kB +2.13% +10.17 kB 🔺
@sentry/nextjs/cloudflare (withSentry) - minified 217.47 kB +1.97% +4.2 kB 🔺

View base workflow run

@isaacs
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 requested review from JPeer264 and andreiborza and removed request for a team 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
@isaacs
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
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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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

Some optional checks were not successful. They do not block the merge. 2 failing, 62 successful. See the run.

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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
@isaacs
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
@isaacs
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
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>
@isaacs
isaacs force-pushed the isaacschlueter/js-3975-share-one-request-handler-wrapper-across-denoserve-bunserve-c branch from 9ff7d48 to a3bb8f3 Compare October 22, 2026 20:25

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

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