{"abstract":"A malformed escape is accepted or every encoded character is rejected.","category":"HTTP redirects","checks":6,"contract":"Validate raw target text before any URL normalization. The explicit fixture inputs and outputs define a bounded offline policy; request identity must accompany the decision.","evaluation_group":"s3-http-redirects-target-lexical-validation","failed_approach":"The partial repair uses \"'%' in raw\" and still fails an explicit boundary or control.","family":"s3-http-redirects-target-lexical-validation-percent-triplet","id":"FA-27906","implementations":{"attempt":{"sha256":"dda95ad7594beacc014b973371508d9b4206a5f9bf5f6401abab74acd6605368","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, raw):\n    return {'request': request, 'decision': ['\\r' in raw or '\\n' in raw, '\\t' in raw.strip(' \\t'), '\\x00' in raw, '%' in raw, '\\\\' in raw]} \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', '/a\\rb\\tc\\x00d%G0\\\\e'), {'request': '/requests/' + str(N) + '/0', 'decision': [True, True, True, True, True]})\ncheck('fixture 2', solve('/requests/' + str(N) + '/1', '\\t/a%20b\\t'), {'request': '/requests/' + str(N) + '/1', 'decision': [False, False, False, False, False]})\ncheck('fixture 3', solve('/requests/' + str(N) + '/2', '/a\\nb'), {'request': '/requests/' + str(N) + '/2', 'decision': [True, False, False, False, False]})\ncheck('fixture 4', solve('/requests/' + str(N) + '/3', '/a%'), {'request': '/requests/' + str(N) + '/3', 'decision': [False, False, False, True, False]})\ncheck('fixture 5', solve('/requests/' + str(N) + '/4', '/normal'), {'request': '/requests/' + str(N) + '/4', 'decision': [False, False, False, False, False]})\ncheck('fixture 6', solve('/requests/' + str(N) + '/5', ''), {'request': '/requests/' + str(N) + '/5', 'decision': [False, False, False, False, 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":"01f5a301cb84b0a8cf5031ff6459aefc9d10d793ecc3078f004a454b5575c814","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, raw):\n    return {'request': request, 'decision': ['\\r' in raw or '\\n' in raw, '\\t' in raw.strip(' \\t'), '\\x00' in raw, raw.endswith('%'), '\\\\' in raw]} \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', '/a\\rb\\tc\\x00d%G0\\\\e'), {'request': '/requests/' + str(N) + '/0', 'decision': [True, True, True, True, True]})\ncheck('fixture 2', solve('/requests/' + str(N) + '/1', '\\t/a%20b\\t'), {'request': '/requests/' + str(N) + '/1', 'decision': [False, False, False, False, False]})\ncheck('fixture 3', solve('/requests/' + str(N) + '/2', '/a\\nb'), {'request': '/requests/' + str(N) + '/2', 'decision': [True, False, False, False, False]})\ncheck('fixture 4', solve('/requests/' + str(N) + '/3', '/a%'), {'request': '/requests/' + str(N) + '/3', 'decision': [False, False, False, True, False]})\ncheck('fixture 5', solve('/requests/' + str(N) + '/4', '/normal'), {'request': '/requests/' + str(N) + '/4', 'decision': [False, False, False, False, False]})\ncheck('fixture 6', solve('/requests/' + str(N) + '/5', ''), {'request': '/requests/' + str(N) + '/5', 'decision': [False, False, False, False, 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"},"fixed":{"sha256":"3788a590222f810d8e0c6e9edf5c7d7f80c1461c85ea2694df3c56077ede76eb","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, raw):\n    return {'request': request, 'decision': ['\\r' in raw or '\\n' in raw, '\\t' in raw.strip(' \\t'), '\\x00' in raw, bool(re.search(r'%(?![0-9A-Fa-f]{2})', raw)), '\\\\' in raw]} \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', '/a\\rb\\tc\\x00d%G0\\\\e'), {'request': '/requests/' + str(N) + '/0', 'decision': [True, True, True, True, True]})\ncheck('fixture 2', solve('/requests/' + str(N) + '/1', '\\t/a%20b\\t'), {'request': '/requests/' + str(N) + '/1', 'decision': [False, False, False, False, False]})\ncheck('fixture 3', solve('/requests/' + str(N) + '/2', '/a\\nb'), {'request': '/requests/' + str(N) + '/2', 'decision': [True, False, False, False, False]})\ncheck('fixture 4', solve('/requests/' + str(N) + '/3', '/a%'), {'request': '/requests/' + str(N) + '/3', 'decision': [False, False, False, True, False]})\ncheck('fixture 5', solve('/requests/' + str(N) + '/4', '/normal'), {'request': '/requests/' + str(N) + '/4', 'decision': [False, False, False, False, False]})\ncheck('fixture 6', solve('/requests/' + str(N) + '/5', ''), {'request': '/requests/' + str(N) + '/5', 'decision': [False, False, False, False, 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-target-lexical-validation-percent-triplet","generated_at":"2026-09-29T14:41:29.269782+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.","repair":"At this decision use \"bool(re.search(r'%(?![0-9A-Fa-f]{2})', raw))\", preserving the other controller outputs.","root_cause":"The percent-triplet decision uses \"raw.endswith('%')\"; this violates the stipulated controller policy.","sha256":"61eb67abf91c236016a373d5493aaebaec28888a3b6f49109a4924f52df18ca5","title":"Validate raw target text before any URL normalization: percent triplet · case 01","variant":1,"variant_policy":"N changes request correlation identity. Policy boundary fixtures are reused; numbered variants are not independent examples.","verification":{"attempt":{"elapsed_ms":42.179,"exit_code":1,"observations":[{"actual":{"decision":[true,true,true,true,true],"request":"/requests/1/0"},"check":"fixture 1","expected":{"decision":[true,true,true,true,true],"request":"/requests/1/0"},"passed":true},{"actual":{"decision":[false,false,false,true,false],"request":"/requests/1/1"},"check":"fixture 2","expected":{"decision":[false,false,false,false,false],"request":"/requests/1/1"},"passed":false},{"actual":{"decision":[true,false,false,false,false],"request":"/requests/1/2"},"check":"fixture 3","expected":{"decision":[true,false,false,false,false],"request":"/requests/1/2"},"passed":true},{"actual":{"decision":[false,false,false,true,false],"request":"/requests/1/3"},"check":"fixture 4","expected":{"decision":[false,false,false,true,false],"request":"/requests/1/3"},"passed":true},{"actual":{"decision":[false,false,false,false,false],"request":"/requests/1/4"},"check":"fixture 5","expected":{"decision":[false,false,false,false,false],"request":"/requests/1/4"},"passed":true},{"actual":{"decision":[false,false,false,false,false],"request":"/requests/1/5"},"check":"fixture 6","expected":{"decision":[false,false,false,false,false],"request":"/requests/1/5"},"passed":true}],"passed":false,"stderr":"","stdout":"{\"observations\": [{\"check\": \"fixture 1\", \"actual\": {\"request\": \"/requests/1/0\", \"decision\": [true, true, true, true, true]}, \"expected\": {\"request\": \"/requests/1/0\", \"decision\": [true, true, true, true, true]}, \"passed\": true}, {\"check\": \"fixture 2\", \"actual\": {\"request\": \"/requests/1/1\", \"decision\": [false, false, false, true, false]}, \"expected\": {\"request\": \"/requests/1/1\", \"decision\": [false, false, false, false, false]}, \"passed\": false}, {\"check\": \"fixture 3\", \"actual\": {\"request\": \"/requests/1/2\", \"decision\": [true, false, false, false, false]}, \"expected\": {\"request\": \"/requests/1/2\", \"decision\": [true, false, false, false, false]}, \"passed\": true}, {\"check\": \"fixture 4\", \"actual\": {\"request\": \"/requests/1/3\", \"decision\": [false, false, false, true, false]}, \"expected\": {\"request\": \"/requests/1/3\", \"decision\": [false, false, false, true, false]}, \"passed\": true}, {\"check\": \"fixture 5\", \"actual\": {\"request\": \"/requests/1/4\", \"decision\": [false, false, false, false, false]}, \"expected\": {\"request\": \"/requests/1/4\", \"decision\": [false, false, false, false, false]}, \"passed\": true}, {\"check\": \"fixture 6\", \"actual\": {\"request\": \"/requests/1/5\", \"decision\": [false, false, false, false, false]}, \"expected\": {\"request\": \"/requests/1/5\", \"decision\": [false, false, false, false, false]}, \"passed\": true}], \"passed\": false}\n"},"broken":{"elapsed_ms":40.516,"exit_code":1,"observations":[{"actual":{"decision":[true,true,true,false,true],"request":"/requests/1/0"},"check":"fixture 1","expected":{"decision":[true,true,true,true,true],"request":"/requests/1/0"},"passed":false},{"actual":{"decision":[false,false,false,false,false],"request":"/requests/1/1"},"check":"fixture 2","expected":{"decision":[false,false,false,false,false],"request":"/requests/1/1"},"passed":true},{"actual":{"decision":[true,false,false,false,false],"request":"/requests/1/2"},"check":"fixture 3","expected":{"decision":[true,false,false,false,false],"request":"/requests/1/2"},"passed":true},{"actual":{"decision":[false,false,false,true,false],"request":"/requests/1/3"},"check":"fixture 4","expected":{"decision":[false,false,false,true,false],"request":"/requests/1/3"},"passed":true},{"actual":{"decision":[false,false,false,false,false],"request":"/requests/1/4"},"check":"fixture 5","expected":{"decision":[false,false,false,false,false],"request":"/requests/1/4"},"passed":true},{"actual":{"decision":[false,false,false,false,false],"request":"/requests/1/5"},"check":"fixture 6","expected":{"decision":[false,false,false,false,false],"request":"/requests/1/5"},"passed":true}],"passed":false,"stderr":"","stdout":"{\"observations\": [{\"check\": \"fixture 1\", \"actual\": {\"request\": \"/requests/1/0\", \"decision\": [true, true, true, false, true]}, \"expected\": {\"request\": \"/requests/1/0\", \"decision\": [true, true, true, true, true]}, \"passed\": false}, {\"check\": \"fixture 2\", \"actual\": {\"request\": \"/requests/1/1\", \"decision\": [false, false, false, false, false]}, \"expected\": {\"request\": \"/requests/1/1\", \"decision\": [false, false, false, false, false]}, \"passed\": true}, {\"check\": \"fixture 3\", \"actual\": {\"request\": \"/requests/1/2\", \"decision\": [true, false, false, false, false]}, \"expected\": {\"request\": \"/requests/1/2\", \"decision\": [true, false, false, false, false]}, \"passed\": true}, {\"check\": \"fixture 4\", \"actual\": {\"request\": \"/requests/1/3\", \"decision\": [false, false, false, true, false]}, \"expected\": {\"request\": \"/requests/1/3\", \"decision\": [false, false, false, true, false]}, \"passed\": true}, {\"check\": \"fixture 5\", \"actual\": {\"request\": \"/requests/1/4\", \"decision\": [false, false, false, false, false]}, \"expected\": {\"request\": \"/requests/1/4\", \"decision\": [false, false, false, false, false]}, \"passed\": true}, {\"check\": \"fixture 6\", \"actual\": {\"request\": \"/requests/1/5\", \"decision\": [false, false, false, false, false]}, \"expected\": {\"request\": \"/requests/1/5\", \"decision\": [false, false, false, false, false]}, \"passed\": true}], \"passed\": false}\n"},"fixed":{"elapsed_ms":39.883,"exit_code":0,"observations":[{"actual":{"decision":[true,true,true,true,true],"request":"/requests/1/0"},"check":"fixture 1","expected":{"decision":[true,true,true,true,true],"request":"/requests/1/0"},"passed":true},{"actual":{"decision":[false,false,false,false,false],"request":"/requests/1/1"},"check":"fixture 2","expected":{"decision":[false,false,false,false,false],"request":"/requests/1/1"},"passed":true},{"actual":{"decision":[true,false,false,false,false],"request":"/requests/1/2"},"check":"fixture 3","expected":{"decision":[true,false,false,false,false],"request":"/requests/1/2"},"passed":true},{"actual":{"decision":[false,false,false,true,false],"request":"/requests/1/3"},"check":"fixture 4","expected":{"decision":[false,false,false,true,false],"request":"/requests/1/3"},"passed":true},{"actual":{"decision":[false,false,false,false,false],"request":"/requests/1/4"},"check":"fixture 5","expected":{"decision":[false,false,false,false,false],"request":"/requests/1/4"},"passed":true},{"actual":{"decision":[false,false,false,false,false],"request":"/requests/1/5"},"check":"fixture 6","expected":{"decision":[false,false,false,false,false],"request":"/requests/1/5"},"passed":true}],"passed":true,"stderr":"","stdout":"{\"observations\": [{\"check\": \"fixture 1\", \"actual\": {\"request\": \"/requests/1/0\", \"decision\": [true, true, true, true, true]}, \"expected\": {\"request\": \"/requests/1/0\", \"decision\": [true, true, true, true, true]}, \"passed\": true}, {\"check\": \"fixture 2\", \"actual\": {\"request\": \"/requests/1/1\", \"decision\": [false, false, false, false, false]}, \"expected\": {\"request\": \"/requests/1/1\", \"decision\": [false, false, false, false, false]}, \"passed\": true}, {\"check\": \"fixture 3\", \"actual\": {\"request\": \"/requests/1/2\", \"decision\": [true, false, false, false, false]}, \"expected\": {\"request\": \"/requests/1/2\", \"decision\": [true, false, false, false, false]}, \"passed\": true}, {\"check\": \"fixture 4\", \"actual\": {\"request\": \"/requests/1/3\", \"decision\": [false, false, false, true, false]}, \"expected\": {\"request\": \"/requests/1/3\", \"decision\": [false, false, false, true, false]}, \"passed\": true}, {\"check\": \"fixture 5\", \"actual\": {\"request\": \"/requests/1/4\", \"decision\": [false, false, false, false, false]}, \"expected\": {\"request\": \"/requests/1/4\", \"decision\": [false, false, false, false, false]}, \"passed\": true}, {\"check\": \"fixture 6\", \"actual\": {\"request\": \"/requests/1/5\", \"decision\": [false, false, false, false, false]}, \"expected\": {\"request\": \"/requests/1/5\", \"decision\": [false, false, false, false, false]}, \"passed\": true}], \"passed\": true}\n"}},"verified":true,"visibility":"public"}