{"abstract":"Commit redirect history only after target admission: the pending entry commit branch emits an incorrect decision.","category":"HTTP redirects","checks":6,"contract":"Commit redirect history only after target admission. The explicit fixture inputs and outputs define a bounded offline policy; request identity must accompany the decision.","contract_signature":"request, history, pending, admitted, completed, terminal","evaluation_group":"s3-http-redirects-history-commit","failed_approach":"The partial repair uses 'history + ([pending] if completed else [])' and still fails an explicit boundary or control.","family":"s3-http-redirects-history-commit-pending-entry-commit","id":"FA-28091","implementations":{"attempt":{"sha256":"3f95c4bbd5fbef1e3e552340f226a2a6657b36cdbf0ca5fc16e5464db5239d35","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, history, pending, admitted, completed, terminal):\n    return {'request': request, 'decision': [history + ([pending] if completed else []), history, pending if admitted else (history[-1] if history else None), completed and terminal, {'completed':history,'rejected':None if admitted else pending}]} \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', ['/z', '/a'], '/b', False, True, False), {'request': '/requests/' + str(N) + '/0', 'decision': [['/z', '/a'], ['/z', '/a'], '/a', False, {'completed': ['/z', '/a'], 'rejected': '/b'}]})\ncheck('fixture 2', solve('/requests/' + str(N) + '/1', ['/z', '/a'], '/b', True, False, False), {'request': '/requests/' + str(N) + '/1', 'decision': [['/z', '/a', '/b'], ['/z', '/a'], '/b', False, {'completed': ['/z', '/a'], 'rejected': None}]})\ncheck('fixture 3', solve('/requests/' + str(N) + '/2', [], '/a', True, True, True), {'request': '/requests/' + str(N) + '/2', 'decision': [['/a'], [], '/a', True, {'completed': [], 'rejected': None}]})\ncheck('fixture 4', solve('/requests/' + str(N) + '/3', [], '/a', False, False, True), {'request': '/requests/' + str(N) + '/3', 'decision': [[], [], None, False, {'completed': [], 'rejected': '/a'}]})\ncheck('fixture 5', solve('/requests/' + str(N) + '/4', ['/a'], '/b', False, False, False), {'request': '/requests/' + str(N) + '/4', 'decision': [['/a'], ['/a'], '/a', False, {'completed': ['/a'], 'rejected': '/b'}]})\ncheck('fixture 6', solve('/requests/' + str(N) + '/5', ['/b', '/a'], '/c', True, True, False), {'request': '/requests/' + str(N) + '/5', 'decision': [['/b', '/a', '/c'], ['/b', '/a'], '/c', False, {'completed': ['/b', '/a'], 'rejected': None}]})\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":"a944bde2f166b8d36ea568e0e393352e1b5b8a69b4ada653bf10537b8f4c53b2","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, history, pending, admitted, completed, terminal):\n    return {'request': request, 'decision': [history + [pending], history, pending if admitted else (history[-1] if history else None), completed and terminal, {'completed':history,'rejected':None if admitted else pending}]} \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', ['/z', '/a'], '/b', False, True, False), {'request': '/requests/' + str(N) + '/0', 'decision': [['/z', '/a'], ['/z', '/a'], '/a', False, {'completed': ['/z', '/a'], 'rejected': '/b'}]})\ncheck('fixture 2', solve('/requests/' + str(N) + '/1', ['/z', '/a'], '/b', True, False, False), {'request': '/requests/' + str(N) + '/1', 'decision': [['/z', '/a', '/b'], ['/z', '/a'], '/b', False, {'completed': ['/z', '/a'], 'rejected': None}]})\ncheck('fixture 3', solve('/requests/' + str(N) + '/2', [], '/a', True, True, True), {'request': '/requests/' + str(N) + '/2', 'decision': [['/a'], [], '/a', True, {'completed': [], 'rejected': None}]})\ncheck('fixture 4', solve('/requests/' + str(N) + '/3', [], '/a', False, False, True), {'request': '/requests/' + str(N) + '/3', 'decision': [[], [], None, False, {'completed': [], 'rejected': '/a'}]})\ncheck('fixture 5', solve('/requests/' + str(N) + '/4', ['/a'], '/b', False, False, False), {'request': '/requests/' + str(N) + '/4', 'decision': [['/a'], ['/a'], '/a', False, {'completed': ['/a'], 'rejected': '/b'}]})\ncheck('fixture 6', solve('/requests/' + str(N) + '/5', ['/b', '/a'], '/c', True, True, False), {'request': '/requests/' + str(N) + '/5', 'decision': [['/b', '/a', '/c'], ['/b', '/a'], '/c', False, {'completed': ['/b', '/a'], 'rejected': None}]})\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-history-commit-pending-entry-commit","generated_at":"2026-09-29T14:41:31.054077+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 pending-entry-commit decision uses 'history + [pending]'; this violates the stipulated controller policy.","sha256":"091d3cf1ada6d4edefa6909c09abf5f96a723d978d093e8eada24796c5437fae","title":"Commit redirect history only after target admission: pending entry commit · 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":37.539,"exit_code":1,"observations":[{"actual":{"decision":[["/z","/a","/b"],["/z","/a"],"/a",false,{"completed":["/z","/a"],"rejected":"/b"}],"request":"/requests/1/0"},"check":"fixture 1","expected":{"decision":[["/z","/a"],["/z","/a"],"/a",false,{"completed":["/z","/a"],"rejected":"/b"}],"request":"/requests/1/0"},"passed":false},{"actual":{"decision":[["/z","/a"],["/z","/a"],"/b",false,{"completed":["/z","/a"],"rejected":null}],"request":"/requests/1/1"},"check":"fixture 2","expected":{"decision":[["/z","/a","/b"],["/z","/a"],"/b",false,{"completed":["/z","/a"],"rejected":null}],"request":"/requests/1/1"},"passed":false},{"actual":{"decision":[["/a"],[],"/a",true,{"completed":[],"rejected":null}],"request":"/requests/1/2"},"check":"fixture 3","expected":{"decision":[["/a"],[],"/a",true,{"completed":[],"rejected":null}],"request":"/requests/1/2"},"passed":true},{"actual":{"decision":[[],[],null,false,{"completed":[],"rejected":"/a"}],"request":"/requests/1/3"},"check":"fixture 4","expected":{"decision":[[],[],null,false,{"completed":[],"rejected":"/a"}],"request":"/requests/1/3"},"passed":true},{"actual":{"decision":[["/a"],["/a"],"/a",false,{"completed":["/a"],"rejected":"/b"}],"request":"/requests/1/4"},"check":"fixture 5","expected":{"decision":[["/a"],["/a"],"/a",false,{"completed":["/a"],"rejected":"/b"}],"request":"/requests/1/4"},"passed":true},{"actual":{"decision":[["/b","/a","/c"],["/b","/a"],"/c",false,{"completed":["/b","/a"],"rejected":null}],"request":"/requests/1/5"},"check":"fixture 6","expected":{"decision":[["/b","/a","/c"],["/b","/a"],"/c",false,{"completed":["/b","/a"],"rejected":null}],"request":"/requests/1/5"},"passed":true}],"passed":false,"stderr":"","stdout":"{\"observations\": [{\"check\": \"fixture 1\", \"actual\": {\"request\": \"/requests/1/0\", \"decision\": [[\"/z\", \"/a\", \"/b\"], [\"/z\", \"/a\"], \"/a\", false, {\"completed\": [\"/z\", \"/a\"], \"rejected\": \"/b\"}]}, \"expected\": {\"request\": \"/requests/1/0\", \"decision\": [[\"/z\", \"/a\"], [\"/z\", \"/a\"], \"/a\", false, {\"completed\": [\"/z\", \"/a\"], \"rejected\": \"/b\"}]}, \"passed\": false}, {\"check\": \"fixture 2\", \"actual\": {\"request\": \"/requests/1/1\", \"decision\": [[\"/z\", \"/a\"], [\"/z\", \"/a\"], \"/b\", false, {\"completed\": [\"/z\", \"/a\"], \"rejected\": null}]}, \"expected\": {\"request\": \"/requests/1/1\", \"decision\": [[\"/z\", \"/a\", \"/b\"], [\"/z\", \"/a\"], \"/b\", false, {\"completed\": [\"/z\", \"/a\"], \"rejected\": null}]}, \"passed\": false}, {\"check\": \"fixture 3\", \"actual\": {\"request\": \"/requests/1/2\", \"decision\": [[\"/a\"], [], \"/a\", true, {\"completed\": [], \"rejected\": null}]}, \"expected\": {\"request\": \"/requests/1/2\", \"decision\": [[\"/a\"], [], \"/a\", true, {\"completed\": [], \"rejected\": null}]}, \"passed\": true}, {\"check\": \"fixture 4\", \"actual\": {\"request\": \"/requests/1/3\", \"decision\": [[], [], null, false, {\"completed\": [], \"rejected\": \"/a\"}]}, \"expected\": {\"request\": \"/requests/1/3\", \"decision\": [[], [], null, false, {\"completed\": [], \"rejected\": \"/a\"}]}, \"passed\": true}, {\"check\": \"fixture 5\", \"actual\": {\"request\": \"/requests/1/4\", \"decision\": [[\"/a\"], [\"/a\"], \"/a\", false, {\"completed\": [\"/a\"], \"rejected\": \"/b\"}]}, \"expected\": {\"request\": \"/requests/1/4\", \"decision\": [[\"/a\"], [\"/a\"], \"/a\", false, {\"completed\": [\"/a\"], \"rejected\": \"/b\"}]}, \"passed\": true}, {\"check\": \"fixture 6\", \"actual\": {\"request\": \"/requests/1/5\", \"decision\": [[\"/b\", \"/a\", \"/c\"], [\"/b\", \"/a\"], \"/c\", false, {\"completed\": [\"/b\", \"/a\"], \"rejected\": null}]}, \"expected\": {\"request\": \"/requests/1/5\", \"decision\": [[\"/b\", \"/a\", \"/c\"], [\"/b\", \"/a\"], \"/c\", false, {\"completed\": [\"/b\", \"/a\"], \"rejected\": null}]}, \"passed\": true}], \"passed\": false}\n"},"broken":{"elapsed_ms":39.771,"exit_code":1,"observations":[{"actual":{"decision":[["/z","/a","/b"],["/z","/a"],"/a",false,{"completed":["/z","/a"],"rejected":"/b"}],"request":"/requests/1/0"},"check":"fixture 1","expected":{"decision":[["/z","/a"],["/z","/a"],"/a",false,{"completed":["/z","/a"],"rejected":"/b"}],"request":"/requests/1/0"},"passed":false},{"actual":{"decision":[["/z","/a","/b"],["/z","/a"],"/b",false,{"completed":["/z","/a"],"rejected":null}],"request":"/requests/1/1"},"check":"fixture 2","expected":{"decision":[["/z","/a","/b"],["/z","/a"],"/b",false,{"completed":["/z","/a"],"rejected":null}],"request":"/requests/1/1"},"passed":true},{"actual":{"decision":[["/a"],[],"/a",true,{"completed":[],"rejected":null}],"request":"/requests/1/2"},"check":"fixture 3","expected":{"decision":[["/a"],[],"/a",true,{"completed":[],"rejected":null}],"request":"/requests/1/2"},"passed":true},{"actual":{"decision":[["/a"],[],null,false,{"completed":[],"rejected":"/a"}],"request":"/requests/1/3"},"check":"fixture 4","expected":{"decision":[[],[],null,false,{"completed":[],"rejected":"/a"}],"request":"/requests/1/3"},"passed":false},{"actual":{"decision":[["/a","/b"],["/a"],"/a",false,{"completed":["/a"],"rejected":"/b"}],"request":"/requests/1/4"},"check":"fixture 5","expected":{"decision":[["/a"],["/a"],"/a",false,{"completed":["/a"],"rejected":"/b"}],"request":"/requests/1/4"},"passed":false},{"actual":{"decision":[["/b","/a","/c"],["/b","/a"],"/c",false,{"completed":["/b","/a"],"rejected":null}],"request":"/requests/1/5"},"check":"fixture 6","expected":{"decision":[["/b","/a","/c"],["/b","/a"],"/c",false,{"completed":["/b","/a"],"rejected":null}],"request":"/requests/1/5"},"passed":true}],"passed":false,"stderr":"","stdout":"{\"observations\": [{\"check\": \"fixture 1\", \"actual\": {\"request\": \"/requests/1/0\", \"decision\": [[\"/z\", \"/a\", \"/b\"], [\"/z\", \"/a\"], \"/a\", false, {\"completed\": [\"/z\", \"/a\"], \"rejected\": \"/b\"}]}, \"expected\": {\"request\": \"/requests/1/0\", \"decision\": [[\"/z\", \"/a\"], [\"/z\", \"/a\"], \"/a\", false, {\"completed\": [\"/z\", \"/a\"], \"rejected\": \"/b\"}]}, \"passed\": false}, {\"check\": \"fixture 2\", \"actual\": {\"request\": \"/requests/1/1\", \"decision\": [[\"/z\", \"/a\", \"/b\"], [\"/z\", \"/a\"], \"/b\", false, {\"completed\": [\"/z\", \"/a\"], \"rejected\": null}]}, \"expected\": {\"request\": \"/requests/1/1\", \"decision\": [[\"/z\", \"/a\", \"/b\"], [\"/z\", \"/a\"], \"/b\", false, {\"completed\": [\"/z\", \"/a\"], \"rejected\": null}]}, \"passed\": true}, {\"check\": \"fixture 3\", \"actual\": {\"request\": \"/requests/1/2\", \"decision\": [[\"/a\"], [], \"/a\", true, {\"completed\": [], \"rejected\": null}]}, \"expected\": {\"request\": \"/requests/1/2\", \"decision\": [[\"/a\"], [], \"/a\", true, {\"completed\": [], \"rejected\": null}]}, \"passed\": true}, {\"check\": \"fixture 4\", \"actual\": {\"request\": \"/requests/1/3\", \"decision\": [[\"/a\"], [], null, false, {\"completed\": [], \"rejected\": \"/a\"}]}, \"expected\": {\"request\": \"/requests/1/3\", \"decision\": [[], [], null, false, {\"completed\": [], \"rejected\": \"/a\"}]}, \"passed\": false}, {\"check\": \"fixture 5\", \"actual\": {\"request\": \"/requests/1/4\", \"decision\": [[\"/a\", \"/b\"], [\"/a\"], \"/a\", false, {\"completed\": [\"/a\"], \"rejected\": \"/b\"}]}, \"expected\": {\"request\": \"/requests/1/4\", \"decision\": [[\"/a\"], [\"/a\"], \"/a\", false, {\"completed\": [\"/a\"], \"rejected\": \"/b\"}]}, \"passed\": false}, {\"check\": \"fixture 6\", \"actual\": {\"request\": \"/requests/1/5\", \"decision\": [[\"/b\", \"/a\", \"/c\"], [\"/b\", \"/a\"], \"/c\", false, {\"completed\": [\"/b\", \"/a\"], \"rejected\": null}]}, \"expected\": {\"request\": \"/requests/1/5\", \"decision\": [[\"/b\", \"/a\", \"/c\"], [\"/b\", \"/a\"], \"/c\", false, {\"completed\": [\"/b\", \"/a\"], \"rejected\": null}]}, \"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."}}