feat(BA-6159): add /upload/status endpoint and progress headers#11770
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Standard TUS HEAD only returns Upload-Offset, which is ambiguous when
chunks arrive out of order: the client cannot tell which byte ranges are
still missing. This sub-task surfaces the session metadata so resume is
precise.
- GET /upload/status?token=… returns JSON: session, total_size,
committed_offset, chunks_received (list of offsets),
missing_ranges (list of {offset, length} gaps),
progress_percent, status. Authenticated via the same upload JWT.
- PATCH responses gain three additive headers:
X-Backend-Ai-Chunks-Received, X-Backend-Ai-Progress-Percent,
X-Backend-Ai-Total-Expected. Headers are exposed via CORS
Access-Control-Expose-Headers so browser clients can read them.
Tests cover the status endpoint for empty / partial / out-of-order /
missing-session cases plus the new PATCH response headers.
Resolves BA-6159. Part of epic BA-6153 (implements BA-3974).
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
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📚 Stacked PRs
This PR is part of a 5-PR stack implementing BA-3974 (epic: BA-6153). Merge in order:
feat(BA-6155): add metadata-driven chunk-store upload session enginefix(BA-6156): rewire TUS PATCH/HEAD to chunk-based store(actual user-visible fix)test(BA-6157): add multi-proxy NFS race regression testfeat(BA-6158): support TUS Checksum extensionfeat(BA-6159): add /upload/status endpoint + progress headers← you are hereSummary
Resolves BA-6159.