When the request includes this parameter, the operation returns a {@code BlobPrefix} elementin the response body that acts as a placeholder for all blobs whose names begin with the same substring up to the appearance of the delimiter character.
@param delimiter a single character or a string.
Causes keys that contain the same string between the prefix and the first occurrence of the delimiter to be rolled up into a single result element in the CommonPrefixes collection. These rolled-up keys are not returned elsewhere in the response.
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