{"abstract":"Te forwarding allows trailers but not transfer codings.","category":"Proxy forwarding","checks":4,"contract":"Bounded offline decision model: te forwarding allows trailers but not transfer codings. Inputs are already validated protocol fields; the explicit fixtures define the supported policy, not a complete protocol implementation.","evaluation_group":"xh-te-forwarding-allows-trailers-but-not-transfer-codings","failed_approach":"The attempted repair uses `[]` and still violates a separate fixture.","family":"xh-te-forwarding-allows-trailers-but-not-transfer-codings","id":"FA-7001","implementations":{"attempt":{"sha256":"7da8a11395b8f557686bb3a1f1f410166a281f1161ada2e8d46717fe53607be1","source":"\"\"\"Failure Map reference implementation. Python standard library only.\"\"\"\nimport json\nimport ipaddress\nimport re\nfrom urllib.parse import urlsplit, urljoin\nN = 1\nobservations = []\ndef solve(values):\n    return []\ndef check(label, actual, expected):\n    observations.append({\"check\": label, \"actual\": actual, \"expected\": expected, \"passed\": actual == expected})\n_fixtures = [\"check('fixture 1', solve(['gzip', 'trailers']), ['trailers'])\", \"check('fixture 2', solve([]), [])\", \"check('fixture 3', solve(['Trailers']), ['Trailers'])\", \"check('fixture 4', solve(['gzip']), [])\"]\nfor _line in _fixtures[N % len(_fixtures):] + _fixtures[:N % len(_fixtures)]:\n    exec(_line)\nprint(json.dumps({\"observations\": observations, \"passed\": all(x[\"passed\"] for x in observations)}, ensure_ascii=False))\nraise SystemExit(0 if all(x[\"passed\"] for x in observations) else 1)\n"},"broken":{"sha256":"6f14c4bced4e6dbbe2455eb32cb98321ec800905b401343d9e999cab2cb69e91","source":"\"\"\"Failure Map reference implementation. Python standard library only.\"\"\"\nimport json\nimport ipaddress\nimport re\nfrom urllib.parse import urlsplit, urljoin\nN = 1\nobservations = []\ndef solve(values):\n    return values\ndef check(label, actual, expected):\n    observations.append({\"check\": label, \"actual\": actual, \"expected\": expected, \"passed\": actual == expected})\n_fixtures = [\"check('fixture 1', solve(['gzip', 'trailers']), ['trailers'])\", \"check('fixture 2', solve([]), [])\", \"check('fixture 3', solve(['Trailers']), ['Trailers'])\", \"check('fixture 4', solve(['gzip']), [])\"]\nfor _line in _fixtures[N % len(_fixtures):] + _fixtures[:N % len(_fixtures)]:\n    exec(_line)\nprint(json.dumps({\"observations\": observations, \"passed\": all(x[\"passed\"] for x in observations)}, ensure_ascii=False))\nraise SystemExit(0 if all(x[\"passed\"] for x in observations) else 1)\n"},"fixed":{"sha256":"1747e65e9cb2628c23d49a47beda6c01377b012c9cb5022c98361df6cfc1507c","source":"\"\"\"Failure Map reference implementation. Python standard library only.\"\"\"\nimport json\nimport ipaddress\nimport re\nfrom urllib.parse import urlsplit, urljoin\nN = 1\nobservations = []\ndef solve(values):\n    return [v for v in values if v.lower() == \"trailers\"]\ndef check(label, actual, expected):\n    observations.append({\"check\": label, \"actual\": actual, \"expected\": expected, \"passed\": actual == expected})\n_fixtures = [\"check('fixture 1', solve(['gzip', 'trailers']), ['trailers'])\", \"check('fixture 2', solve([]), [])\", \"check('fixture 3', solve(['Trailers']), ['Trailers'])\", \"check('fixture 4', solve(['gzip']), [])\"]\nfor _line in _fixtures[N % len(_fixtures):] + _fixtures[:N % len(_fixtures)]:\n    exec(_line)\nprint(json.dumps({\"observations\": observations, \"passed\": all(x[\"passed\"] for x in observations)}, ensure_ascii=False))\nraise SystemExit(0 if all(x[\"passed\"] for x in observations) else 1)\n"}},"limitations":"Bounded deterministic policy model over validated inputs; not a complete protocol stack or an interoperability claim. The five variants rotate the same explicit fixture set. This reproducer isolates one failure mechanism. Results cover the supplied fixtures. Variants within a family share a test contract and should remain grouped when constructing evaluation splits. Related mechanisms with a shared evaluation_group must also remain together; these controlled models are not independent production incidents.","method":"Deterministic executable model with adversarial boundary fixtures.","provenance":{"created_by":"Failure Map","dependencies":"Python standard library","family":"xh-te-forwarding-allows-trailers-but-not-transfer-codings","generated_at":"2026-09-29T14:38:07.383228+00:00","license":"CC0-1.0","python":"3.12.14","seed":1,"split":"open-access"},"relevance":"This deterministic proxy forwarding model isolates the te-forwarding-allows-trailers-but-not-transfer-codings policy at a network component boundary.","repair":"Apply the explicit te-forwarding-allows-trailers-but-not-transfer-codings contract, including the tested boundary and negative cases.","root_cause":"The faulty implementation uses `values` for the te-forwarding-allows-trailers-but-not-transfer-codings decision.","sha256":"de4bd1e7330fd070de73297cd13232cd9d8a2d340d6dab40e80900240a6ec116","title":"Te forwarding allows trailers but not transfer codings · case 01","variant":1,"variant_policy":"Five numbered records share a model and may reuse boundary fixtures.","verification":{"attempt":{"elapsed_ms":35.265,"exit_code":1,"observations":[{"actual":[],"check":"fixture 2","expected":[],"passed":true},{"actual":[],"check":"fixture 3","expected":["Trailers"],"passed":false},{"actual":[],"check":"fixture 4","expected":[],"passed":true},{"actual":[],"check":"fixture 1","expected":["trailers"],"passed":false}],"passed":false,"stderr":"","stdout":"{\"observations\": [{\"check\": \"fixture 2\", \"actual\": [], \"expected\": [], \"passed\": true}, {\"check\": \"fixture 3\", \"actual\": [], \"expected\": [\"Trailers\"], \"passed\": false}, {\"check\": \"fixture 4\", \"actual\": [], \"expected\": [], \"passed\": true}, {\"check\": \"fixture 1\", \"actual\": [], \"expected\": [\"trailers\"], \"passed\": false}], \"passed\": false}\n"},"broken":{"elapsed_ms":36.943,"exit_code":1,"observations":[{"actual":[],"check":"fixture 2","expected":[],"passed":true},{"actual":["Trailers"],"check":"fixture 3","expected":["Trailers"],"passed":true},{"actual":["gzip"],"check":"fixture 4","expected":[],"passed":false},{"actual":["gzip","trailers"],"check":"fixture 1","expected":["trailers"],"passed":false}],"passed":false,"stderr":"","stdout":"{\"observations\": [{\"check\": \"fixture 2\", \"actual\": [], \"expected\": [], \"passed\": true}, {\"check\": \"fixture 3\", \"actual\": [\"Trailers\"], \"expected\": [\"Trailers\"], \"passed\": true}, {\"check\": \"fixture 4\", \"actual\": [\"gzip\"], \"expected\": [], \"passed\": false}, {\"check\": \"fixture 1\", \"actual\": [\"gzip\", \"trailers\"], \"expected\": [\"trailers\"], \"passed\": false}], \"passed\": false}\n"},"fixed":{"elapsed_ms":38.686,"exit_code":0,"observations":[{"actual":[],"check":"fixture 2","expected":[],"passed":true},{"actual":["Trailers"],"check":"fixture 3","expected":["Trailers"],"passed":true},{"actual":[],"check":"fixture 4","expected":[],"passed":true},{"actual":["trailers"],"check":"fixture 1","expected":["trailers"],"passed":true}],"passed":true,"stderr":"","stdout":"{\"observations\": [{\"check\": \"fixture 2\", \"actual\": [], \"expected\": [], \"passed\": true}, {\"check\": \"fixture 3\", \"actual\": [\"Trailers\"], \"expected\": [\"Trailers\"], \"passed\": true}, {\"check\": \"fixture 4\", \"actual\": [], \"expected\": [], \"passed\": true}, {\"check\": \"fixture 1\", \"actual\": [\"trailers\"], \"expected\": [\"trailers\"], \"passed\": true}], \"passed\": true}\n"}},"verified":true,"visibility":"public"}