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fix(dev): use URL separators for static file paths - #8593
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Priority: ➖ Normal Estimated code review effort: 1 (Trivial) | ~5 minutes Change: Bug fix Suggested reviewers: Merge Risk: ⚪ Minimal · up to The path formatting change preserves POSIX filename backslashes while producing URL-style separators on Windows. No concrete regression is established, so the change is ready for normal merge checks. Architecture SummaryArchitecture risk: 🔵 Low · up to The change affects 1 system. Changed systems: Architecture concerns Review detailsSystems and components
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- 🪄 Fix CodeRabbit comments on this PR
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Inline comments:
Review comments at @src/utils/proxy.ts:
- Line 160: Update the return path in getStatic to preserve backslashes in POSIX
filenames, applying separator normalization only on Windows; keep the existing
leading slash and normalized Windows paths.
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src/utils/proxy.ts
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getStatic built the forwarded URL from path.relative, which yields backslashes on Windows. @fastify/static 10.1.4 added a path spelling guard that stats the joined path, finds the file under a different spelling, and returns 403. Normalize to forward slashes.
A POSIX filename may contain a literal backslash. Splitting on the OS separator only rewrites Windows separators.
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🤖 I have created a release *beep* *boop* --- ## [27.12.0](v27.11.2...v27.12.0) (2026-10-08) ### Features * **init:** install Netlify agent skills by default ([#8555](#8555)) ([f3d7e82](f3d7e82)) * **init:** sync installed skills with the manifest ([#8556](#8556)) ([332666c](332666c)) ### Bug Fixes * **deps:** batch low-risk dependency updates ([#8585](#8585)) ([edd9f44](edd9f44)) * **deps:** update content-type to v3 and read the header string directly ([#8572](#8572)) ([969145c](969145c)) * **dev:** use URL separators for static file paths ([#8593](#8593)) ([626224b](626224b)) * **init:** report skill sync outcomes accurately on the first run ([#8580](#8580)) ([0f2b082](0f2b082)) --- This PR was generated with [Release Please](https://github.com/googleapis/release-please). See [documentation](https://github.com/googleapis/release-please#release-please). Co-authored-by: token-generator-app[bot] <82042599+token-generator-app[bot]@users.noreply.github.com>
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Problem
netlify devreturns 403 on Windows for static files that need a redirectshadow check, such as paths with spaces or brackets.
getStaticbuilds theURL forwarded to the static server with
path.relative, which yieldsbackslashes on Windows, so the static server receives
/files%5Cfile%20with%20spaces.html.This has been latent since 2020.
@fastify/static10.1.4 (GHSA-r799-r9gc-m956)added a path spelling guard that splits on
/, stats the joined path, findsthe file under a different spelling, and rejects it. Earlier versions served
the file.
Surfaced by the Windows integration shard on #8575, which fails
should not shadow an existing file that has unsafe URL characterson everyattempt. The previous five release PRs passed it.
Approach
Split the relative path on
path.sepand join with/, so the URL alwaysuses forward slashes. Only OS separators are rewritten; a literal backslash in
a POSIX filename is preserved.
Tests
npm run typecheck,npx eslint src/utils/proxy.ts,npm run build: cleannpm exec vitest -- run tests/integration/commands/dev/dev.test.tswith@fastify/static10.1.5 installed: 27 passedVerified on macOS only, where
path.relativealready returns forward slashes,so this run cannot reproduce the bug. PRs do not run Windows integration
tests. The proof is the Windows shard on the regenerated release PR after
this merges.
Risk
Low. One-line change on the path the proxy already controls. No behavior
change on POSIX, where
path.sepis already/.Rollback
Revert this commit.