def has_header(self, name, value=None):
    return _has_header(parse_headers(self.raw_headers), name, value)
tests True mapping ids listed.
dataset/ETHPy150Open tweksteen/burst/burst/http.py/Request.has_header--crossover with--dataset/ETHPy150Open saltstack/salt/tests/unit/modules/boto_lambda_test.py/BotoLambdaEventSourceMappingTestCase.test_that_when_listing_mapping_ids_succeeds_the_get_event_source_mapping_ids_method_returns_true