Broken pipe when sending many files / large studies

[feliwir]

Hey,

when sending many files via my DICOMweb client to DICOM-RST i get the following error in the logs:

dicom-rst-1  | 2026-04-30T09:41:09.824627Z ERROR request:studies: Failed to read multipart stream: failed to read stream method=POST uri=/aets/ORTHANC/studies version=HTTP/1.1

My DICOMweb client gives me this error (see https://github.com/mbits-imaging/dicomweb-rs):

Error: RequestFailed { url: "http://localhost:8080/aets/ORTHANC/studies", source: reqwest::Error { kind: Request, url: "http://localhost:8080/aets/ORTHANC/studies", source: hyper_util::client::legacy::Error(SendRequest, hyper::Error(BodyWrite, Os { code: 32, kind: BrokenPipe, message: "Broken pipe" })) } }

However when sending directly to Orthanc via STOW-RS (same client) i don't get this issue. So i suspect the error is somewhat related to DICOM-RST. Have you encountered something similar before?

[feliwir]

Apparently this issue is due to a too low size limit. However i am wondering why that path is not triggered: https://github.com/UMEssen/DICOM-RST/blob/main/src/api/stow/routes.rs#L47

[nickamzol]

Thank you for pointing this out.

The inner error is actually http_body_util::LengthLimitError, not the LengthLimitError from axum that we're trying to downcast to. Same name, but different types, so the check never passed.

I'll clean up the error handling in the STOW-RS service handler and add some (desperately needed!) integration tests.