'Load the request headers options model to gather arguments.
:param func func_obj: The request function.'

def _load_options_model(self, func_obj):

    option_type = find_param_type(func_obj, self._options_param)
    option_type = class_name(option_type)
    self._options_model = _load_model(option_type)()
    self._options_attrs = list(self._options_model.__dict__.keys())
