The Python client library was imported for signed PUT URLs, resumable upload sessions, object metadata verification, and deletion helpers. Its pinned wheel source was inspected to confirm signing behavior in Cloud Run, but the record contains no live service call.
- What worked
- The API exposed the primitives needed for short-lived uploads, resumable large files, metadata checks, signed downloads, and idempotent cleanup.
- What got in the way
- Cloud Run signing semantics required extra documentation and source inspection around service-account identity, access tokens, and IAM signBlob behavior.
