{"abstract":"Resolve stored redirect chains with per-entry freshness and provenance: the cached response count branch emits an incorrect decision.","category":"HTTP redirects","checks":6,"contract":"Resolve stored redirect chains with per-entry freshness and provenance. The explicit fixture inputs and outputs define a bounded offline policy; request identity must accompany the decision.","contract_signature":"request, targets, fresh, network, blocked, now, inserted","evaluation_group":"s3-http-redirects-cached-chain-lookup","failed_approach":"The partial repair uses 'max(0,len(targets)-1)' and still fails an explicit boundary or control.","family":"s3-http-redirects-cached-chain-lookup-cached-response-count","id":"FA-28476","implementations":{"attempt":{"sha256":"eac1fa5332e44ee537e07c5fe2d82272db08549328fa41500c1f7582b98c5d71","source":"\"\"\"Failure Map reference implementation. Python standard library only.\"\"\"\nimport json\nfrom urllib.parse import urlsplit, unquote, quote\nimport posixpath\nimport re\nN = 1\nobservations = []\ndef solve(request, targets, fresh, network, blocked, now, inserted):\n    return {'request': request, 'decision': [targets, next((i for i,f in enumerate(fresh) if not f),None), all(fresh), max(0,now-inserted), 'network' if network else 'cache', blocked and not network, targets[0] if targets else None, max(0,len(targets)-1), not targets, targets[:next((i for i,f in enumerate(fresh) if not f),len(fresh))]]} \ndef check(label, actual, expected):\n    observations.append({\"check\": label, \"actual\": actual, \"expected\": expected, \"passed\": actual == expected})\ncheck('fixture 1', solve('/requests/' + str(N) + '/0', ['/b', '/c'], [True, False], False, False, 20, 10), {'request': '/requests/' + str(N) + '/0', 'decision': [['/b', '/c'], 1, False, 10, 'cache', False, '/b', 2, False, ['/b']]})\ncheck('fixture 2', solve('/requests/' + str(N) + '/1', ['/b'], [True], True, False, 10, 10), {'request': '/requests/' + str(N) + '/1', 'decision': [['/b'], None, True, 0, 'network', False, '/b', 1, False, ['/b']]})\ncheck('fixture 3', solve('/requests/' + str(N) + '/2', [], [], True, False, 0, 0), {'request': '/requests/' + str(N) + '/2', 'decision': [[], None, True, 0, 'network', False, None, 0, True, []]})\ncheck('fixture 4', solve('/requests/' + str(N) + '/3', ['/z', '/a'], [True, True], False, True, 30, 5), {'request': '/requests/' + str(N) + '/3', 'decision': [['/z', '/a'], None, True, 25, 'cache', True, '/z', 2, False, ['/z', '/a']]})\ncheck('fixture 5', solve('/requests/' + str(N) + '/4', ['/a', '/a'], [False, True], False, False, 8, 9), {'request': '/requests/' + str(N) + '/4', 'decision': [['/a', '/a'], 0, False, 0, 'cache', False, '/a', 2, False, []]})\ncheck('fixture 6', solve('/requests/' + str(N) + '/5', ['/q'], [False], True, True, 100, 80), {'request': '/requests/' + str(N) + '/5', 'decision': [['/q'], 0, False, 20, 'network', False, '/q', 1, False, []]})\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":"5ab9bc6f6879d446e1f6a3ec8cea2a847ff7f5cc8cc487689853937f5324b199","source":"\"\"\"Failure Map reference implementation. Python standard library only.\"\"\"\nimport json\nfrom urllib.parse import urlsplit, unquote, quote\nimport posixpath\nimport re\nN = 1\nobservations = []\ndef solve(request, targets, fresh, network, blocked, now, inserted):\n    return {'request': request, 'decision': [targets, next((i for i,f in enumerate(fresh) if not f),None), all(fresh), max(0,now-inserted), 'network' if network else 'cache', blocked and not network, targets[0] if targets else None, len(set(targets)), not targets, targets[:next((i for i,f in enumerate(fresh) if not f),len(fresh))]]} \ndef check(label, actual, expected):\n    observations.append({\"check\": label, \"actual\": actual, \"expected\": expected, \"passed\": actual == expected})\ncheck('fixture 1', solve('/requests/' + str(N) + '/0', ['/b', '/c'], [True, False], False, False, 20, 10), {'request': '/requests/' + str(N) + '/0', 'decision': [['/b', '/c'], 1, False, 10, 'cache', False, '/b', 2, False, ['/b']]})\ncheck('fixture 2', solve('/requests/' + str(N) + '/1', ['/b'], [True], True, False, 10, 10), {'request': '/requests/' + str(N) + '/1', 'decision': [['/b'], None, True, 0, 'network', False, '/b', 1, False, ['/b']]})\ncheck('fixture 3', solve('/requests/' + str(N) + '/2', [], [], True, False, 0, 0), {'request': '/requests/' + str(N) + '/2', 'decision': [[], None, True, 0, 'network', False, None, 0, True, []]})\ncheck('fixture 4', solve('/requests/' + str(N) + '/3', ['/z', '/a'], [True, True], False, True, 30, 5), {'request': '/requests/' + str(N) + '/3', 'decision': [['/z', '/a'], None, True, 25, 'cache', True, '/z', 2, False, ['/z', '/a']]})\ncheck('fixture 5', solve('/requests/' + str(N) + '/4', ['/a', '/a'], [False, True], False, False, 8, 9), {'request': '/requests/' + str(N) + '/4', 'decision': [['/a', '/a'], 0, False, 0, 'cache', False, '/a', 2, False, []]})\ncheck('fixture 6', solve('/requests/' + str(N) + '/5', ['/q'], [False], True, True, 100, 80), {'request': '/requests/' + str(N) + '/5', 'decision': [['/q'], 0, False, 20, 'network', False, '/q', 1, False, []]})\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":"Stipulated offline redirect policy, not a complete HTTP, browser, URL, cache, or security implementation. Numbered variants vary request correlation identity. 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":"s3-http-redirects-cached-chain-lookup-cached-response-count","generated_at":"2026-09-29T14:41:34.424484+00:00","license":"CC0-1.0","python":"3.12.14","seed":1,"split":"open-access"},"relevance":"Models a redirect controller decision before following a target or exposing a redirect result.","root_cause":"The cached-response-count decision uses 'len(set(targets))'; this violates the stipulated controller policy.","sha256":"27fd0100f9c1c12e4a96885a16fe2a501e60dbade5a1e0f91f10403011874aa5","title":"Resolve stored redirect chains with per-entry freshness and provenance: cached response count · case 01","variant":1,"variant_policy":"N changes request correlation identity. Policy boundary fixtures are reused; numbered variants are not independent examples.","verified":true,"visibility":"public","verification":{"attempt":{"elapsed_ms":36.965,"exit_code":1,"observations":[{"actual":{"decision":[["/b","/c"],1,false,10,"cache",false,"/b",1,false,["/b"]],"request":"/requests/1/0"},"check":"fixture 1","expected":{"decision":[["/b","/c"],1,false,10,"cache",false,"/b",2,false,["/b"]],"request":"/requests/1/0"},"passed":false},{"actual":{"decision":[["/b"],null,true,0,"network",false,"/b",0,false,["/b"]],"request":"/requests/1/1"},"check":"fixture 2","expected":{"decision":[["/b"],null,true,0,"network",false,"/b",1,false,["/b"]],"request":"/requests/1/1"},"passed":false},{"actual":{"decision":[[],null,true,0,"network",false,null,0,true,[]],"request":"/requests/1/2"},"check":"fixture 3","expected":{"decision":[[],null,true,0,"network",false,null,0,true,[]],"request":"/requests/1/2"},"passed":true},{"actual":{"decision":[["/z","/a"],null,true,25,"cache",true,"/z",1,false,["/z","/a"]],"request":"/requests/1/3"},"check":"fixture 4","expected":{"decision":[["/z","/a"],null,true,25,"cache",true,"/z",2,false,["/z","/a"]],"request":"/requests/1/3"},"passed":false},{"actual":{"decision":[["/a","/a"],0,false,0,"cache",false,"/a",1,false,[]],"request":"/requests/1/4"},"check":"fixture 5","expected":{"decision":[["/a","/a"],0,false,0,"cache",false,"/a",2,false,[]],"request":"/requests/1/4"},"passed":false},{"actual":{"decision":[["/q"],0,false,20,"network",false,"/q",0,false,[]],"request":"/requests/1/5"},"check":"fixture 6","expected":{"decision":[["/q"],0,false,20,"network",false,"/q",1,false,[]],"request":"/requests/1/5"},"passed":false}],"passed":false,"stderr":"","stdout":"{\"observations\": [{\"check\": \"fixture 1\", \"actual\": {\"request\": \"/requests/1/0\", \"decision\": [[\"/b\", \"/c\"], 1, false, 10, \"cache\", false, \"/b\", 1, false, [\"/b\"]]}, \"expected\": {\"request\": \"/requests/1/0\", \"decision\": [[\"/b\", \"/c\"], 1, false, 10, \"cache\", false, \"/b\", 2, false, [\"/b\"]]}, \"passed\": false}, {\"check\": \"fixture 2\", \"actual\": {\"request\": \"/requests/1/1\", \"decision\": [[\"/b\"], null, true, 0, \"network\", false, \"/b\", 0, false, [\"/b\"]]}, \"expected\": {\"request\": \"/requests/1/1\", \"decision\": [[\"/b\"], null, true, 0, \"network\", false, \"/b\", 1, false, [\"/b\"]]}, \"passed\": false}, {\"check\": \"fixture 3\", \"actual\": {\"request\": \"/requests/1/2\", \"decision\": [[], null, true, 0, \"network\", false, null, 0, true, []]}, \"expected\": {\"request\": \"/requests/1/2\", \"decision\": [[], null, true, 0, \"network\", false, null, 0, true, []]}, \"passed\": true}, {\"check\": \"fixture 4\", \"actual\": {\"request\": \"/requests/1/3\", \"decision\": [[\"/z\", \"/a\"], null, true, 25, \"cache\", true, \"/z\", 1, false, [\"/z\", \"/a\"]]}, \"expected\": {\"request\": \"/requests/1/3\", \"decision\": [[\"/z\", \"/a\"], null, true, 25, \"cache\", true, \"/z\", 2, false, [\"/z\", \"/a\"]]}, \"passed\": false}, {\"check\": \"fixture 5\", \"actual\": {\"request\": \"/requests/1/4\", \"decision\": [[\"/a\", \"/a\"], 0, false, 0, \"cache\", false, \"/a\", 1, false, []]}, \"expected\": {\"request\": \"/requests/1/4\", \"decision\": [[\"/a\", \"/a\"], 0, false, 0, \"cache\", false, \"/a\", 2, false, []]}, \"passed\": false}, {\"check\": \"fixture 6\", \"actual\": {\"request\": \"/requests/1/5\", \"decision\": [[\"/q\"], 0, false, 20, \"network\", false, \"/q\", 0, false, []]}, \"expected\": {\"request\": \"/requests/1/5\", \"decision\": [[\"/q\"], 0, false, 20, \"network\", false, \"/q\", 1, false, []]}, \"passed\": false}], \"passed\": false}\n"},"broken":{"elapsed_ms":40.711,"exit_code":1,"observations":[{"actual":{"decision":[["/b","/c"],1,false,10,"cache",false,"/b",2,false,["/b"]],"request":"/requests/1/0"},"check":"fixture 1","expected":{"decision":[["/b","/c"],1,false,10,"cache",false,"/b",2,false,["/b"]],"request":"/requests/1/0"},"passed":true},{"actual":{"decision":[["/b"],null,true,0,"network",false,"/b",1,false,["/b"]],"request":"/requests/1/1"},"check":"fixture 2","expected":{"decision":[["/b"],null,true,0,"network",false,"/b",1,false,["/b"]],"request":"/requests/1/1"},"passed":true},{"actual":{"decision":[[],null,true,0,"network",false,null,0,true,[]],"request":"/requests/1/2"},"check":"fixture 3","expected":{"decision":[[],null,true,0,"network",false,null,0,true,[]],"request":"/requests/1/2"},"passed":true},{"actual":{"decision":[["/z","/a"],null,true,25,"cache",true,"/z",2,false,["/z","/a"]],"request":"/requests/1/3"},"check":"fixture 4","expected":{"decision":[["/z","/a"],null,true,25,"cache",true,"/z",2,false,["/z","/a"]],"request":"/requests/1/3"},"passed":true},{"actual":{"decision":[["/a","/a"],0,false,0,"cache",false,"/a",1,false,[]],"request":"/requests/1/4"},"check":"fixture 5","expected":{"decision":[["/a","/a"],0,false,0,"cache",false,"/a",2,false,[]],"request":"/requests/1/4"},"passed":false},{"actual":{"decision":[["/q"],0,false,20,"network",false,"/q",1,false,[]],"request":"/requests/1/5"},"check":"fixture 6","expected":{"decision":[["/q"],0,false,20,"network",false,"/q",1,false,[]],"request":"/requests/1/5"},"passed":true}],"passed":false,"stderr":"","stdout":"{\"observations\": [{\"check\": \"fixture 1\", \"actual\": {\"request\": \"/requests/1/0\", \"decision\": [[\"/b\", \"/c\"], 1, false, 10, \"cache\", false, \"/b\", 2, false, [\"/b\"]]}, \"expected\": {\"request\": \"/requests/1/0\", \"decision\": [[\"/b\", \"/c\"], 1, false, 10, \"cache\", false, \"/b\", 2, false, [\"/b\"]]}, \"passed\": true}, {\"check\": \"fixture 2\", \"actual\": {\"request\": \"/requests/1/1\", \"decision\": [[\"/b\"], null, true, 0, \"network\", false, \"/b\", 1, false, [\"/b\"]]}, \"expected\": {\"request\": \"/requests/1/1\", \"decision\": [[\"/b\"], null, true, 0, \"network\", false, \"/b\", 1, false, [\"/b\"]]}, \"passed\": true}, {\"check\": \"fixture 3\", \"actual\": {\"request\": \"/requests/1/2\", \"decision\": [[], null, true, 0, \"network\", false, null, 0, true, []]}, \"expected\": {\"request\": \"/requests/1/2\", \"decision\": [[], null, true, 0, \"network\", false, null, 0, true, []]}, \"passed\": true}, {\"check\": \"fixture 4\", \"actual\": {\"request\": \"/requests/1/3\", \"decision\": [[\"/z\", \"/a\"], null, true, 25, \"cache\", true, \"/z\", 2, false, [\"/z\", \"/a\"]]}, \"expected\": {\"request\": \"/requests/1/3\", \"decision\": [[\"/z\", \"/a\"], null, true, 25, \"cache\", true, \"/z\", 2, false, [\"/z\", \"/a\"]]}, \"passed\": true}, {\"check\": \"fixture 5\", \"actual\": {\"request\": \"/requests/1/4\", \"decision\": [[\"/a\", \"/a\"], 0, false, 0, \"cache\", false, \"/a\", 1, false, []]}, \"expected\": {\"request\": \"/requests/1/4\", \"decision\": [[\"/a\", \"/a\"], 0, false, 0, \"cache\", false, \"/a\", 2, false, []]}, \"passed\": false}, {\"check\": \"fixture 6\", \"actual\": {\"request\": \"/requests/1/5\", \"decision\": [[\"/q\"], 0, false, 20, \"network\", false, \"/q\", 1, false, []]}, \"expected\": {\"request\": \"/requests/1/5\", \"decision\": [[\"/q\"], 0, false, 20, \"network\", false, \"/q\", 1, false, []]}, \"passed\": true}], \"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."}}