- InitiateMultipartUpload: POST /s3/multipart/:bucket/:key/init
- UploadPart: PUT /s3/multipart/:bucket/:key/part
- CompleteMultipartUpload: POST /s3/multipart/:bucket/:key/complete
- AbortMultipartUpload: DELETE /s3/multipart/:bucket/:key/abort
- In-memory upload tracking with once_cell::Lazy
- Part files stored in temp dir during upload
- Final file assembled on CompleteMultipartUpload
- XML responses for all operations
Tests: 293 passed, 0 failed
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