Repair Multipart Boundary Bugs

The problem

Large file uploads fail intermittently when boundaries are split across streaming chunks or when binary data mimics boundary prefixes. These bugs often lead to truncated files, unhandled temporary file leaks, and hard-to-reproduce parsing errors in production.

What it does

• Identifies state machine failures in multipart/form-data and MIME parsing logic.
• Repairs boundary overlap handling and CRLF framing to prevent premature part truncation.
• Implements deterministic chunk-split test matrices to verify streaming stability.
• Fixes resource lifecycle management to ensure temporary files are cleaned up after cancellation or malformed input.
• Corrects handling of quoted boundary parameters and nested parts without weakening validation policy.

Frameworks & tools

Works with repository-level streaming parsers, HTTP servers, and MIME encoders. Compatible with languages using local file systems and standard networking libraries.

Why this beats prompting it yourself

Parsing multipart streams is notoriously edge-case heavy, especially when boundaries split across byte buffers. This skill enforces a rigorous state machine audit and ownership register, ensuring you don't just fix one symptom while leaving resource leaks or concurrency race conditions behind.

Use cases

• Fixing uploads that crash only at specific chunk sizes or network speeds.
• Preventing binary payloads from being misinterpreted as closing delimiters.
• Auditing multipart parsers for quoted boundary and preamble compliance.
• Automating the cleanup of orphaned temp files during failed streaming transfers.

Known limitations

This skill cannot fix issues requiring production service access or live secret rotation. It does not replace correctness with increased timeouts or catch-all error suppression.