def _check_copy_from_header(req):
 return _check_path_header(req, 'X-Copy-From', 2, 'X-Copy-From header must be of the form <container name>/<object name>')

def _check_copy_from_header ( req ) : return _check_path_header ( req , 'X-Copy-From' , 2 , 'X-Copy-From header must be of the form <container name>/<object name>' )
validate that the value from x-copy-from header is well formatted .