Hasher-Server

Chunk-based remote file integrity checking for large transfers.

A Go HTTP server that compares large remote files to local ones by hashing byte ranges — designed for unreliable connections and very large archives.

Problem

• Large file transfers can partially corrupt without obvious failure signals.
• Re-downloading multi‑GB archives is expensive when only small ranges are damaged.

Solution

• Exposed an HTTP interface that hashes file chunks (byte ranges) and compares results.
• Enabled verification and targeted re-transfer of only the affected ranges.

Highlights

• Chunk/range hashing for terabyte-scale workflows
• Simple HTTP interface for easy integration
• Designed around unreliable networks and partial corruption

Screenshots

What I learned

• Range-based workflows benefit from careful input validation and bounds checks.
• Operational usability matters: clear parameters, predictable performance, and logs.

Notes

• This is an open-source personal project (not client work).

Links

• GitHub repository