Fetch a single object from any supported backend (S3, GCS, Azure Blob, HTTP(S), SFTP, local, WebDAV, Google Drive, OneDrive, Dropbox). The backend is inferred from the URI scheme and hidden from the user.
URI of the object to fetch (e.g. s3://bucket/key, https://host/path, file:///abs/path). A bare absolute path is accepted as file://.
format
string
Optional format hint (GeoTIFF, GeoJSON, CSV, Parquet, ...). Recorded in the invocation sidecar for downstream reference; not used to validate the bytes. Empty string means "unknown".