docs: private String getBucketRegionViaHeadRequest(String bucketName) {
          String bucketRegion = null;
  
          try {
              Request<HeadBucketRequest> request = createRequest(bucketName, null,
                      new HeadBucketRequest(bucketName), HttpMethodName.HEAD);
              request.addHandlerContext(HandlerContextKey.OPERATION_NAME, "HeadBucket");
  
              HeadBucketResult result = invoke(request, new HeadBucketResultHandler(), bucketName, null, true);
              bucketRegion = result.getBucketRegion();
          } catch (AmazonS3Exception exception) {
              if (exception.getAdditionalDetails() != null) {
                  bucketRegion = exception.getAdditionalDetails().get(
                      Headers.S3_BUCKET_REGION);
              }
          }
  
          if (bucketRegion == null && log.isDebugEnabled()) {
              log.debug("Not able to derive region of the " + bucketName + " from the HEAD Bucket requests.");
          }
  
          return bucketRegion;
      }