{"abstract":"S maxage overrides max age only in shared cache.","category":"HTTP caching","checks":4,"contract":"Bounded offline decision model: s maxage overrides max age only in shared cache. Inputs are already validated protocol fields; the explicit fixtures define the supported policy, not a complete protocol implementation.","evaluation_group":"xh-s-maxage-overrides-max-age-only-in-shared-cache","failed_approach":"The attempted repair uses `smax if shared and smax else maxage` and still violates a separate fixture.","family":"xh-s-maxage-overrides-max-age-only-in-shared-cache","id":"FA-6721","implementations":{"attempt":{"sha256":"1ac80cd907bd9d9b7f82cc3eaa9af4f750b8095472b01525093a2f777465c922","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(shared, smax, maxage):\n    return smax if shared and smax else maxage\ndef check(label, actual, expected):\n    observations.append({\"check\": label, \"actual\": actual, \"expected\": expected, \"passed\": actual == expected})\n_fixtures = [\"check('fixture 1', solve(True, 0, 30), 0)\", \"check('fixture 2', solve(False, 10, 30), 30)\", \"check('fixture 3', solve(True, None, 30), 30)\", \"check('fixture 4', solve(True, 10, 30), 10)\"]\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":"9768e2f7dffbdb263c98ca430110e335e45465165d134d1183a13205e6833743","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(shared, smax, maxage):\n    return smax if smax is not None else maxage\ndef check(label, actual, expected):\n    observations.append({\"check\": label, \"actual\": actual, \"expected\": expected, \"passed\": actual == expected})\n_fixtures = [\"check('fixture 1', solve(True, 0, 30), 0)\", \"check('fixture 2', solve(False, 10, 30), 30)\", \"check('fixture 3', solve(True, None, 30), 30)\", \"check('fixture 4', solve(True, 10, 30), 10)\"]\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":"f2a69c6565631bf6d608ae2d3f9e6b806193f056479230a435fcb72fdc5f5f9b","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(shared, smax, maxage):\n    return smax if shared and smax is not None else maxage\ndef check(label, actual, expected):\n    observations.append({\"check\": label, \"actual\": actual, \"expected\": expected, \"passed\": actual == expected})\n_fixtures = [\"check('fixture 1', solve(True, 0, 30), 0)\", \"check('fixture 2', solve(False, 10, 30), 30)\", \"check('fixture 3', solve(True, None, 30), 30)\", \"check('fixture 4', solve(True, 10, 30), 10)\"]\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-s-maxage-overrides-max-age-only-in-shared-cache","generated_at":"2026-09-29T14:38:04.609689+00:00","license":"CC0-1.0","python":"3.12.14","seed":1,"split":"open-access"},"relevance":"This deterministic http caching model isolates the s-maxage-overrides-max-age-only-in-shared-cache policy at a network component boundary.","repair":"Apply the explicit s-maxage-overrides-max-age-only-in-shared-cache contract, including the tested boundary and negative cases.","root_cause":"The faulty implementation uses `smax if smax is not None else maxage` for the s-maxage-overrides-max-age-only-in-shared-cache decision.","sha256":"caa0b464368273d3c75cffe95aa1b52b6c2efc4dcd278dc9cf6d2be0c35d5f70","title":"S maxage overrides max age only in shared cache · case 01","variant":1,"variant_policy":"Five numbered records share a model and may reuse boundary fixtures.","verification":{"attempt":{"elapsed_ms":40.256,"exit_code":1,"observations":[{"actual":30,"check":"fixture 2","expected":30,"passed":true},{"actual":30,"check":"fixture 3","expected":30,"passed":true},{"actual":10,"check":"fixture 4","expected":10,"passed":true},{"actual":30,"check":"fixture 1","expected":0,"passed":false}],"passed":false,"stderr":"","stdout":"{\"observations\": [{\"check\": \"fixture 2\", \"actual\": 30, \"expected\": 30, \"passed\": true}, {\"check\": \"fixture 3\", \"actual\": 30, \"expected\": 30, \"passed\": true}, {\"check\": \"fixture 4\", \"actual\": 10, \"expected\": 10, \"passed\": true}, {\"check\": \"fixture 1\", \"actual\": 30, \"expected\": 0, \"passed\": false}], \"passed\": false}\n"},"broken":{"elapsed_ms":35.659,"exit_code":1,"observations":[{"actual":10,"check":"fixture 2","expected":30,"passed":false},{"actual":30,"check":"fixture 3","expected":30,"passed":true},{"actual":10,"check":"fixture 4","expected":10,"passed":true},{"actual":0,"check":"fixture 1","expected":0,"passed":true}],"passed":false,"stderr":"","stdout":"{\"observations\": [{\"check\": \"fixture 2\", \"actual\": 10, \"expected\": 30, \"passed\": false}, {\"check\": \"fixture 3\", \"actual\": 30, \"expected\": 30, \"passed\": true}, {\"check\": \"fixture 4\", \"actual\": 10, \"expected\": 10, \"passed\": true}, {\"check\": \"fixture 1\", \"actual\": 0, \"expected\": 0, \"passed\": true}], \"passed\": false}\n"},"fixed":{"elapsed_ms":39.931,"exit_code":0,"observations":[{"actual":30,"check":"fixture 2","expected":30,"passed":true},{"actual":30,"check":"fixture 3","expected":30,"passed":true},{"actual":10,"check":"fixture 4","expected":10,"passed":true},{"actual":0,"check":"fixture 1","expected":0,"passed":true}],"passed":true,"stderr":"","stdout":"{\"observations\": [{\"check\": \"fixture 2\", \"actual\": 30, \"expected\": 30, \"passed\": true}, {\"check\": \"fixture 3\", \"actual\": 30, \"expected\": 30, \"passed\": true}, {\"check\": \"fixture 4\", \"actual\": 10, \"expected\": 10, \"passed\": true}, {\"check\": \"fixture 1\", \"actual\": 0, \"expected\": 0, \"passed\": true}], \"passed\": true}\n"}},"verified":true,"visibility":"public"}