2.2.1.5 Moss-CBFile Header

A WebDAV client SHOULD NOT include the Moss-CBFile header in any HTTP 1.1 requests.<5>

If this header is included, it MUST contain the lower DWORD, as defined in [MS-DTYP], of the size of the file it is uploading, in bytes. This new header is specified as follows:

 Moss-CBFile Header = "moss-cbfile" ":" 1*DIGIT 

Because the server ignores this header, there are no usage specifications for this header.