'This class method recurses through request data dictionary and removes
any default values.
:type data: dict
:param data: Specifies request parameters with default values to be removed.'

@classmethod
def _normalize_request_dict(cls, data):

    for item in list(data.keys()):
        if isinstance(data[item], dict):
            cls._normalize_request_dict(data[item])
        if (data[item] in (None, {})):
            del data[item]
