@cached_property
    def if_range(self):
        return parse_if_range_header(self.environ.get('HTTP_IF_RANGE'))
Get original exception from exception pickled using
dataset/ETHPy150Open Eforcers/gae-flask-todo/lib/werkzeug/wrappers.py/ETagRequestMixin.if_range--crossover with--dataset/ETHPy150Open kmike/tornado-slacker/slacker/serialization.py/get_pickled_exception