[ Version ( since = "0.13.0" ) ]
public int64 content_length { get; construct; }
The content length (in bytes) of the file being uploaded (i.e. as returned by get_size).
Note that this does not include the length of the XML serialisation of entry , if set.
If this is -1 the upload will be non-resumable; if it is non-negative, the upload will be resumable.