BlockBlobGetBlockListHeaders
The size of the blob in bytes. 
The media type of the body of the response. For Get Block List this is 'application/xml'. 
Returns the date and time the container was last modified. Any operation that modifies the blob, including an update of the blob's metadata or properties, changes the last-modified time of the blob. 
Indicates the version of the Blob service used to execute the request. This header is returned for requests made against version 2009-09-19 and above.