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Chris Lu 155140bed8 s3: return IncompleteBody instead of 500 for truncated PUT bodies (#10186)
* s3: add IncompleteBody error code

* operation: tag a truncated source read as ErrTruncatedBody

The chunked uploader wraps both source-read failures and volume-upload failures,
and a mid-write volume server drop also carries io.ErrUnexpectedEOF. Tag only the
source read so callers can tell a truncated input apart from a server-side fault.

* s3: return IncompleteBody for a truncated PUT body

A client abort or reverse-proxy timeout truncates the request body mid-upload.
putToFiler mapped every streaming-upload failure to InternalError (500), which a
reverse proxy relays as a 502. Classify a source-read truncation as IncompleteBody
(400) so the response matches AWS and passes through. All S3 write paths share
putToFiler, so they all benefit.
2026-07-01 18:45:17 -07:00
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