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Download
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Downlaod DataSets
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    http://localhost:4567/downloadDataSets?datasetID=***

recursively download the Dataset

return the status of the operation "succeed" or "failure"

Download the images under a dataset
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    http://localhost:4567/downloadOneDataSets?datasetID=***

Only download the images below the dataset

return the status of the operation "succeed" or "failure"