def get_field_select(self, fld, alias=None):
        sel_fmt = self.get_select_format(fld)
        if fld in self.custom_select:
            field_sel = sel_fmt % self.custom_select[fld]
        else:
            field_sel = sel_fmt % self._field_column(fld, alias)
        return field_sel
CORS Specification Section 6.2.8
dataset/ETHPy150Open dcramer/django-compositepks/django/contrib/gis/db/models/sql/query.py/GeoQuery.get_field_select--crossover with--dataset/ETHPy150Open openstack/oslo.middleware/oslo_middleware/tests/test_cors.py/CORSPreflightRequestTest.test_optional_max_age