fix: disable rsbuild server compression

[schiller-manuel]

fixes #7344

Summary by CodeRabbit

• Bug Fixes
  • Fixed an issue with Server-Side Rendering response header handling to prevent data corruption during transmission.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 270c32b8-a7d5-4f7e-b53c-988ff090b992

📥 Commits

Reviewing files that changed from the base of the PR and between bcefc84 and 042bbfe.

📒 Files selected for processing (1)

• packages/start-plugin-core/src/rsbuild/plugin.ts

---

📝 Walkthrough

Walkthrough

A bug fix that disables HTTP compression in the Rsbuild server configuration by setting compress: false. This prevents Rsbuild's compression layer from corrupting SSR response headers when Node.js writes headers using the writeHead object form.

Changes

SSR Header Corruption Fix

Layer / File(s)	Summary
Server Configuration packages/start-plugin-core/src/rsbuild/plugin.ts	Rsbuild server config now explicitly disables compression with compress: false to prevent header array corruption during SSR.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~2 minutes

Poem

A header went walking, all twisted and strange,
Compression had scrambled its numeric exchange.
One line, one setting—the fix came so quick,
compress: false was the medicinal trick! 🐰✨

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 0.00% which is insufficient. The required threshold is 80.00%.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly and specifically describes the main change: disabling rsbuild server compression to fix malformed headers.
Linked Issues check	✅ Passed	The PR adds compress: false to rsbuild configuration, directly addressing the root cause of malformed headers reported in issue #7344.
Out of Scope Changes check	✅ Passed	The change is narrowly scoped to fixing the reported issue; only the rsbuild server compression setting was modified.

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✨ Finishing Touches

📝 Generate docstrings

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix-7344

---

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[nx-cloud]

View your CI Pipeline Execution ↗ for commit 042bbfe

Command	Status	Duration	Result
nx affected --targets=test:eslint,test:unit,tes...	❌ Failed	8m 29s	View ↗
nx run-many --target=build --exclude=examples/*...	✅ Succeeded	53s	View ↗

---

☁️ Nx Cloud last updated this comment at 2026-05-05 20:10:40 UTC

[github-actions]

🚀 Changeset Version Preview

No changeset entries found. Merging this PR will not cause a version bump for any packages.

[github-actions]

Bundle Size Benchmarks

• Commit: bcefc84d7e83
• Measured at: 2026-05-05T20:03:01.768Z
• Baseline source: history:056337ef02cc
• Dashboard: bundle-size history

Scenario	Current (gzip)	Delta vs baseline	Raw	Brotli	Trend
react-router.minimal	87.15 KiB	0 B (0.00%)	273.94 KiB	75.70 KiB	▅▅▅▅▅▅▅▅▅▅▅
react-router.full	90.68 KiB	0 B (0.00%)	285.45 KiB	78.71 KiB	▅▅▅▅▅▅▅▅▅▅▅
solid-router.minimal	35.38 KiB	0 B (0.00%)	106.25 KiB	31.81 KiB	▅▅▅▅▅▅▅▅▅▅▅
solid-router.full	40.10 KiB	0 B (0.00%)	120.46 KiB	36.04 KiB	▅▅▅▅▅▅▅▅▅▅▅
vue-router.minimal	53.15 KiB	0 B (0.00%)	151.39 KiB	47.73 KiB	▅▅▅▅▅▅▅▅▅▅▅
vue-router.full	58.28 KiB	0 B (0.00%)	167.56 KiB	52.18 KiB	▅▅▅▅▅▅▅▅▅▅▅
react-start.minimal	101.76 KiB	0 B (0.00%)	322.10 KiB	87.97 KiB	▅▅▅▅▅▅▅▅▅▅▅
react-start.full	105.19 KiB	0 B (0.00%)	332.43 KiB	90.96 KiB	▅▅▅▅▅▅▅▅▅▅▅
react-start.rsbuild.minimal	99.33 KiB	0 B (0.00%)	316.47 KiB	85.46 KiB	▅▅▅▅▅▅▅▅▅▅▅
react-start.rsbuild.full	102.63 KiB	0 B (0.00%)	326.90 KiB	88.28 KiB	▅▅▅▅▅▅▅▅▅▅▅
solid-start.minimal	49.40 KiB	0 B (0.00%)	152.08 KiB	43.60 KiB	▅▅▅▅▅▅▅▅▅▅▅
solid-start.full	55.20 KiB	0 B (0.00%)	168.98 KiB	48.51 KiB	▅▅▅▅▅▅▅▅▅▅▅

Trend sparkline is historical gzip bytes ending with this PR measurement; lower is better.

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commit: 042bbfe

[nx-cloud]

Nx Cloud has identified a flaky task in your failed CI:

🔂 Since the failure was identified as flaky, we triggered a CI rerun by adding an empty commit to this branch.

View detailed reasoning in Nx Cloud ↗

_{🎓 Learn more about Self-Healing CI on nx.dev}

[codspeed-hq]

Merging this PR will not alter performance

✅ 5 untouched benchmarks
⏩ 1 skipped benchmark¹

---

_{Comparing fix-7344 (042bbfe) with main (056337e)²}

Footnotes

1. 1 benchmark was skipped, so the baseline result was used instead. If it was deleted from the codebase, click here and archive it to remove it from the performance reports. ↩

2. No successful run was found on main (bcefc84) during the generation of this report, so 056337e was used instead as the comparison base. There might be some changes unrelated to this pull request in this report. ↩