{"abstract":"Max forwards is decremented only for trace and options.","category":"Proxy forwarding","checks":4,"contract":"Bounded offline decision model: max forwards is decremented only for trace and options. Inputs are already validated protocol fields; the explicit fixtures define the supported policy, not a complete protocol implementation.","contract_signature":"method, count","evaluation_group":"xh-max-forwards-is-decremented-only-for-trace-and-options","failed_approach":"The attempted repair uses `count` and still violates a separate fixture.","family":"xh-max-forwards-is-decremented-only-for-trace-and-options","id":"FA-6991","implementations":{"attempt":{"sha256":"3e5076a1f56c0e6b6d666f33b45169c442c594be31e748db1a686b3af0acb1fb","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(method, count):\n    return count\ndef check(label, actual, expected):\n    observations.append({\"check\": label, \"actual\": actual, \"expected\": expected, \"passed\": actual == expected})\n_fixtures = [\"check('fixture 1', solve('GET', 5), 5)\", \"check('fixture 2', solve('OPTIONS', 5), 4)\", \"check('fixture 3', solve('TRACE', 0), 0)\", \"check('fixture 4', solve('POST', 0), 0)\"]\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":"a691ebec55dfd755f79c80364ad77c30519199684f3ddebdc537fce5be0dfce8","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(method, count):\n    return max(0,count-1)\ndef check(label, actual, expected):\n    observations.append({\"check\": label, \"actual\": actual, \"expected\": expected, \"passed\": actual == expected})\n_fixtures = [\"check('fixture 1', solve('GET', 5), 5)\", \"check('fixture 2', solve('OPTIONS', 5), 4)\", \"check('fixture 3', solve('TRACE', 0), 0)\", \"check('fixture 4', solve('POST', 0), 0)\"]\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-max-forwards-is-decremented-only-for-trace-and-options","generated_at":"2026-09-29T14:38:07.268029+00:00","license":"CC0-1.0","python":"3.12.14","seed":1,"split":"open-access"},"relevance":"This deterministic proxy forwarding model isolates the max-forwards-is-decremented-only-for-trace-and-options policy at a network component boundary.","root_cause":"The faulty implementation uses `max(0,count-1)` for the max-forwards-is-decremented-only-for-trace-and-options decision.","sha256":"e2d613703a34a4a21ff158cf557d194b18d11f7914239c2e790ace0a3707f080","title":"Max forwards is decremented only for trace and options · case 01","variant":1,"variant_policy":"Five numbered records share a model and may reuse boundary fixtures.","verified":true,"visibility":"public","verification":{"attempt":{"elapsed_ms":36.18,"exit_code":1,"observations":[{"actual":5,"check":"fixture 2","expected":4,"passed":false},{"actual":0,"check":"fixture 3","expected":0,"passed":true},{"actual":0,"check":"fixture 4","expected":0,"passed":true},{"actual":5,"check":"fixture 1","expected":5,"passed":true}],"passed":false,"stderr":"","stdout":"{\"observations\": [{\"check\": \"fixture 2\", \"actual\": 5, \"expected\": 4, \"passed\": false}, {\"check\": \"fixture 3\", \"actual\": 0, \"expected\": 0, \"passed\": true}, {\"check\": \"fixture 4\", \"actual\": 0, \"expected\": 0, \"passed\": true}, {\"check\": \"fixture 1\", \"actual\": 5, \"expected\": 5, \"passed\": true}], \"passed\": false}\n"},"broken":{"elapsed_ms":36.689,"exit_code":1,"observations":[{"actual":4,"check":"fixture 2","expected":4,"passed":true},{"actual":0,"check":"fixture 3","expected":0,"passed":true},{"actual":0,"check":"fixture 4","expected":0,"passed":true},{"actual":4,"check":"fixture 1","expected":5,"passed":false}],"passed":false,"stderr":"","stdout":"{\"observations\": [{\"check\": \"fixture 2\", \"actual\": 4, \"expected\": 4, \"passed\": true}, {\"check\": \"fixture 3\", \"actual\": 0, \"expected\": 0, \"passed\": true}, {\"check\": \"fixture 4\", \"actual\": 0, \"expected\": 0, \"passed\": true}, {\"check\": \"fixture 1\", \"actual\": 4, \"expected\": 5, \"passed\": false}], \"passed\": false}\n"}},"member_only":{"stages":["fixed"],"fields":["implementations.fixed","verification.fixed","harness","repair"],"note":"The verified repair, its recorded checks, the repair description, and the scoring harness are available to members."}}