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S3Client: Fix ETag KeyError when HeadObject omits ETag #583

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pjbull merged 2 commits into from
Aug 22, 2026
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S3Client: Fix ETag KeyError when HeadObject omits ETag #583

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S3Client: Fix ETag KeyError when HeadObject omits ETag
srstsavage Aug 21, 2026
5838c02
Merge branch 'master' into cloudpathlib-582-allow-headobject-missing-…
pjbull Aug 22, 2026
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1 change: 1 addition & 0 deletions HISTORY.md
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Original file line number Diff line number Diff line change
Expand Up @@ -21,6 +21,7 @@
- Changed `S3Client._get_metadata` to read object metadata with `HeadObject` instead of `GetObject`, so `stat`, `etag`, and `size` no longer open the object body. Also fixes a `KeyError` on `ContentLength` against S3-compatible gateways that drop `Content-Length` from `GetObject` responses. (Issue [#564](https://github.com/drivendataorg/cloudpathlib/issues/564), PR [#565](https://github.com/drivendataorg/cloudpathlib/pull/565))
- Added a `lazy` keyword argument to `CloudPath.walk`. By default (`lazy=False`) the existing fast behavior is preserved: the whole subtree is fetched up front with a single recursive listing. Passing `lazy=True` lists each directory on demand so that, when `top_down=True`, callers can prune subdirectories by modifying `dirnames` in-place (à la `os.walk` / `Path.walk`) to skip fetching the contents of those subtrees entirely — dramatically reducing API calls for large, sparsely-traversed trees. (Issue [#518](https://github.com/drivendataorg/cloudpathlib/issues/518))
- Fixed S3 copy and move operations to forward copy-specific extra args such as `CopySourceSSECustomerKey`, and added `addressing_style="virtual"` support for `S3Client` (Issues [#500](https://github.com/drivendataorg/cloudpathlib/issues/500), [#527](https://github.com/drivendataorg/cloudpathlib/issues/527))
- Fix `KeyError` on `ETag` against S3-compatible gateways that omit `ETag` from `HeadObject` responses. (Issue [#582](https://github.com/drivendataorg/cloudpathlib/issues/582), PR [#583](https://github.com/drivendataorg/cloudpathlib/pull/583))

## v0.24.0 (2026-04-29)
- Added support for S3 Multi-Region Access Point (MRAP) URLs in `S3Path` (Issue [#556](https://github.com/drivendataorg/cloudpathlib/issues/556), PR [#557](https://github.com/drivendataorg/cloudpathlib/pull/557))
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2 changes: 1 addition & 1 deletion cloudpathlib/s3/s3client.py
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Expand Up @@ -154,7 +154,7 @@ def _get_metadata(self, cloud_path: S3Path) -> Dict[str, Any]:
return {
"last_modified": data["LastModified"],
"size": data["ContentLength"],
"etag": data["ETag"],
"etag": data.get("ETag", None),
"content_type": data.get("ContentType", None),
"extra": data["Metadata"],
}
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