pitrou opened a new pull request, #41798:
URL: https://github.com/apache/arrow/pull/41798
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### Rationale for this change
To get the region a S3 bucket resides on, it is required to issue a
HeadBucket region and parse the response headers for a certain header value.
Unfortunately, the AWS SDK doesn't let us access arbitrary headers on
successful responses for S3 model requests, which had us implement a workaround
by calling lower-level SDK APIs.
However, the SDK recently added a `GetBucketRegion` method on
`HeadBucketRequest`, which obsoletes the need for this workaround. We now use
this method if the available AWS SDK version is recent enough.
### Are these changes tested?
By existing tests on the various CI configurations.
### Are there any user-facing changes?
No.
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