'x-b3-traceid': '80f198ee56343ba864fe8b2a57d3eff7',
            'x-b3-spanid': 'e457b5a2e4d86bd1',
            'x-b3-sampled': '1',
            'sw8': '40c7fdf104e3de67'
        }
        m.get("http://reviews:9080/reviews/%d" % product_id, text='{}',
              request_headers=expected_headers)

        uri = "/api/v1/products/%d/reviews" % product_id
        headers = {