returns xml fragment.
if success attribute is "true", the download handler and other information has been retrieved successfully like the xml sample below.
if success attribute is "false", the error attribute indicates the encountered error.
<response success="true" error="" Size="115474" ContentType="application/pdf" ModificationDate="2009-01-30 17:52:02" VersionNumber="1000000" AlterDocumentName="CSharp Coding Standards.pdf" RenderedContent="false" CRC32="D19496AE" ChunkSize="65536" downloadhandler="ir178"/>