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FD-2026-015 UTF-8 BOM prefix

corruption trivial encodingjsonparser

Anatomy

A Windows-authored API prepends the three BOM bytes (EF BB BF) before the JSON. Most parsers choke on the unexpected leading bytes; Go's encoding/json errors with "invalid character 'ï'". Signature failure of files saved by Notepad-era tooling.

Replay it

curl -i https://faultydata.com/r/FD-2026-015
// response appears here

Signature

{Status:200 Headers:map[] Body: Corrupt:bom Delay:<nil> Flaky:<nil> Sequence:<nil> Drip:<nil> StallAfter:0 Hang:false Phases:[]}