[dinwwwh]

Fixes #182

Problem

encodeAtomicStandardBody set the content-type of a FormData body from blob.type. Blob.type is ASCII-lowercased, boundary included, while the serialized body keeps the original boundary. Chrome generates mixed-case boundaries (----WebKitFormBoundary…), so the receiving peer could not find the delimiter and formData() failed (TypeError: Failed to fetch). Firefox and Node use lowercase boundaries, which hid the bug.

Fix

• peer: take the content-type from the Response headers, which keep the original case, and read it before blob(): Bun drops the header once a body containing a File has been consumed. This matches the node adapter.
• node: comment only, noting the same read-before-body requirement on its existing response.headers.get('content-type')!.

Tests

• New unit test in packages/peer/src/body.test.ts stubs Response to emit a Chrome-style mixed-case boundary, then checks the encoded header and a full encode → decode round trip. It fails without the fix.
• The Bun ordering is covered by the existing bun-ws buffered body formdata e2e test, which fails when the header is read after blob().
• pnpm check and pnpm test pass.

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Generated by Claude Code

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commit: 1b72c33

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

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[codspeed]

Merging this PR will not alter performance

1 warning

⚠️ 4 benchmarks are dominated by system calls

System calls cannot be simulated consistently and are left out of the measure. The reported value understates the real cost. Switch to the Walltime instrument to measure them.

Learn more about system calls

See affected benchmarks

✅ 26 untouched benchmarks
⏩ 108 skipped benchmarks¹

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_{Comparing claude/stoic-faraday-6mota4 (1b72c33) with main (ca10b64)}

Footnotes

1. 108 benchmarks were skipped, so the baseline results were used instead. If they were deleted from the codebase, click here and archive them to remove them from the performance reports. ↩