perf(world-vercel): use HTTP/2 with connection multiplexing #1019
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…equests Add undici Agent with allowH2 and pipelining to all fetch calls in world-vercel, enabling HTTP/2 multiplexing and connection reuse for both the storage API (makeRequest) and streaming API paths. Co-Authored-By: Claude Opus 4.6 <[email protected]>
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🦋 Changeset detectedLatest commit: 9b895c7 The changes in this PR will be included in the next version bump. This PR includes changesets to release 15 packages
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📊 Benchmark Results
workflow with no steps💻 Local Development
workflow with 1 step💻 Local Development
workflow with 10 sequential steps💻 Local Development
workflow with 25 sequential steps💻 Local Development
workflow with 50 sequential steps💻 Local Development
Promise.all with 10 concurrent steps💻 Local Development
Promise.all with 25 concurrent steps💻 Local Development
Promise.all with 50 concurrent steps💻 Local Development
Promise.race with 10 concurrent steps💻 Local Development
Promise.race with 25 concurrent steps💻 Local Development
Promise.race with 50 concurrent steps💻 Local Development
Stream Benchmarks (includes TTFB metrics)workflow with stream💻 Local Development
SummaryFastest Framework by WorldWinner determined by most benchmark wins
Fastest World by FrameworkWinner determined by most benchmark wins
Column Definitions
Worlds:
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🧪 E2E Test Results❌ Some tests failed Summary
❌ Failed Tests▲ Vercel Production (58 failed)astro (2 failed):
example (2 failed):
express (1 failed):
fastify (5 failed):
nextjs-webpack (1 failed):
nuxt (3 failed):
sveltekit (39 failed):
vite (5 failed):
🌍 Community Worlds (42 failed)mongodb (1 failed):
turso (41 failed):
Details by Category❌ ▲ Vercel Production
✅ 💻 Local Development
✅ 📦 Local Production
✅ 🐘 Local Postgres
✅ 🪟 Windows
❌ 🌍 Community Worlds
✅ 📋 Other
❌ Some E2E test jobs failed:
Check the workflow run for details. |
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Pull request overview
This PR improves request performance in @workflow/world-vercel by introducing a shared undici Agent configured to negotiate HTTP/2 and reuse a single connection via multiplexing, then wiring that dispatcher into all relevant fetch paths.
Changes:
- Add an
undiciAgent(allowH2: true,pipelining: 10) and pass it asdispatcherto the centralizedmakeRequest()fetch. - Pass the same
dispatcherto all direct streamingfetchcalls instreamer.ts. - Add
undicidependency and a changeset for a patch release.
Reviewed changes
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Show a summary per file
| File | Description |
|---|---|
packages/world-vercel/src/utils.ts |
Creates a shared undici Agent and uses it for makeRequest() fetch calls. |
packages/world-vercel/src/streamer.ts |
Threads the shared dispatcher into all streaming-related fetch calls. |
packages/world-vercel/package.json |
Adds undici as a dependency for the Agent/dispatcher. |
pnpm-lock.yaml |
Locks the new undici dependency resolution. |
.changeset/h2-client.md |
Declares a patch release note for the performance change. |
Files not reviewed (1)
- pnpm-lock.yaml: Language not supported
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The undici h2 Agent conflicts with duplex: 'half' streaming requests in Vercel Functions, causing connections to hang. Keep h2 for standard request/response calls in makeRequest() only. Co-Authored-By: Claude Opus 4.6 <[email protected]>
The change from fetch(new Request(...)) to fetch(url, {...}) altered
request body/header normalization, causing HTTP 400s. Restore the
original new Request() pattern and pass dispatcher as the second arg
to fetch(request, { dispatcher }).
Co-Authored-By: Claude Opus 4.6 <[email protected]>
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Summary
undiciAgent withallowH2: trueandpipelining: 10to all fetch calls in@workflow/world-vercelmakeRequest()path (22 API calls) and the direct streaming fetch calls (5 calls)Test plan
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