{"abstract":"Expose final response metadata without leaking intermediate representation state: the redirected even return to origin branch emits an incorrect decision.","category":"HTTP redirects","checks":6,"contract":"Expose final response metadata without leaking intermediate representation state. The explicit fixture inputs and outputs define a bounded offline policy; request identity must accompany the decision.","evaluation_group":"s3-http-redirects-final-response-wrapper","failed_approach":"The partial repair uses 'len(statuses)>2' and still fails an explicit boundary or control.","family":"s3-http-redirects-final-response-wrapper-redirected-even-return-to-origin","id":"FA-28301","implementations":{"attempt":{"sha256":"446e1f7447cb4ca4d11c2a7a7afe2dd440e56a798b26bb54c16d10593bec7493","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, original, final, statuses, body, intermediate_lengths, final_length):\n    return {'request': request, 'decision': [final, statuses[-1], len(statuses)>2, body, final_length, sum(intermediate_lengths)+final_length, statuses[:-1], len(statuses)-1, statuses[-1]>=400, statuses[0]]} \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', '/c', [301, 302, 200], 'ok', [8, 9], 2), {'request': '/requests/' + str(N) + '/0', 'decision': ['/c', 200, True, 'ok', 2, 19, [301, 302], 2, False, 301]})\ncheck('fixture 2', solve('/requests/' + str(N) + '/1', '/a', '/a', [200], '', [], 0), {'request': '/requests/' + str(N) + '/1', 'decision': ['/a', 200, False, '', 0, 0, [], 0, False, 200]})\ncheck('fixture 3', solve('/requests/' + str(N) + '/2', '/x', '/y', [307, 404], 'err', [100], 3), {'request': '/requests/' + str(N) + '/2', 'decision': ['/y', 404, True, 'err', 3, 103, [307], 1, True, 307]})\ncheck('fixture 4', solve('/requests/' + str(N) + '/3', '/x', '/x', [302, 302, 200], 'done', [0, 2], 4), {'request': '/requests/' + str(N) + '/3', 'decision': ['/x', 200, True, 'done', 4, 6, [302, 302], 2, False, 302]})\ncheck('fixture 5', solve('/requests/' + str(N) + '/4', '/m', '/n', [308, 204], '', [5], 0), {'request': '/requests/' + str(N) + '/4', 'decision': ['/n', 204, True, '', 0, 5, [308], 1, False, 308]})\ncheck('fixture 6', solve('/requests/' + str(N) + '/5', '/v', '/w', [303, 500], 'bad', [7], 3), {'request': '/requests/' + str(N) + '/5', 'decision': ['/w', 500, True, 'bad', 3, 10, [303], 1, True, 303]})\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":"9eeeeef7f334fab1719d552998e54c89073d2b5d5663b1beaba3a87afe691527","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, original, final, statuses, body, intermediate_lengths, final_length):\n    return {'request': request, 'decision': [final, statuses[-1], original != final, body, final_length, sum(intermediate_lengths)+final_length, statuses[:-1], len(statuses)-1, statuses[-1]>=400, statuses[0]]} \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', '/c', [301, 302, 200], 'ok', [8, 9], 2), {'request': '/requests/' + str(N) + '/0', 'decision': ['/c', 200, True, 'ok', 2, 19, [301, 302], 2, False, 301]})\ncheck('fixture 2', solve('/requests/' + str(N) + '/1', '/a', '/a', [200], '', [], 0), {'request': '/requests/' + str(N) + '/1', 'decision': ['/a', 200, False, '', 0, 0, [], 0, False, 200]})\ncheck('fixture 3', solve('/requests/' + str(N) + '/2', '/x', '/y', [307, 404], 'err', [100], 3), {'request': '/requests/' + str(N) + '/2', 'decision': ['/y', 404, True, 'err', 3, 103, [307], 1, True, 307]})\ncheck('fixture 4', solve('/requests/' + str(N) + '/3', '/x', '/x', [302, 302, 200], 'done', [0, 2], 4), {'request': '/requests/' + str(N) + '/3', 'decision': ['/x', 200, True, 'done', 4, 6, [302, 302], 2, False, 302]})\ncheck('fixture 5', solve('/requests/' + str(N) + '/4', '/m', '/n', [308, 204], '', [5], 0), {'request': '/requests/' + str(N) + '/4', 'decision': ['/n', 204, True, '', 0, 5, [308], 1, False, 308]})\ncheck('fixture 6', solve('/requests/' + str(N) + '/5', '/v', '/w', [303, 500], 'bad', [7], 3), {'request': '/requests/' + str(N) + '/5', 'decision': ['/w', 500, True, 'bad', 3, 10, [303], 1, True, 303]})\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":"0e41b750c86286acb11e49bcf252a2b14876a150194c4eeabeb4f43881e20210","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, original, final, statuses, body, intermediate_lengths, final_length):\n    return {'request': request, 'decision': [final, statuses[-1], len(statuses)>1, body, final_length, sum(intermediate_lengths)+final_length, statuses[:-1], len(statuses)-1, statuses[-1]>=400, statuses[0]]} \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', '/c', [301, 302, 200], 'ok', [8, 9], 2), {'request': '/requests/' + str(N) + '/0', 'decision': ['/c', 200, True, 'ok', 2, 19, [301, 302], 2, False, 301]})\ncheck('fixture 2', solve('/requests/' + str(N) + '/1', '/a', '/a', [200], '', [], 0), {'request': '/requests/' + str(N) + '/1', 'decision': ['/a', 200, False, '', 0, 0, [], 0, False, 200]})\ncheck('fixture 3', solve('/requests/' + str(N) + '/2', '/x', '/y', [307, 404], 'err', [100], 3), {'request': '/requests/' + str(N) + '/2', 'decision': ['/y', 404, True, 'err', 3, 103, [307], 1, True, 307]})\ncheck('fixture 4', solve('/requests/' + str(N) + '/3', '/x', '/x', [302, 302, 200], 'done', [0, 2], 4), {'request': '/requests/' + str(N) + '/3', 'decision': ['/x', 200, True, 'done', 4, 6, [302, 302], 2, False, 302]})\ncheck('fixture 5', solve('/requests/' + str(N) + '/4', '/m', '/n', [308, 204], '', [5], 0), {'request': '/requests/' + str(N) + '/4', 'decision': ['/n', 204, True, '', 0, 5, [308], 1, False, 308]})\ncheck('fixture 6', solve('/requests/' + str(N) + '/5', '/v', '/w', [303, 500], 'bad', [7], 3), {'request': '/requests/' + str(N) + '/5', 'decision': ['/w', 500, True, 'bad', 3, 10, [303], 1, True, 303]})\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-final-response-wrapper-redirected-even-return-to-origin","generated_at":"2026-09-29T14:41:32.696360+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 'len(statuses)>1', preserving the other controller outputs.","root_cause":"The redirected-even-return-to-origin decision uses 'original != final'; this violates the stipulated controller policy.","sha256":"2b691b4a01e51af7e1fed488ba8acd98e8a49af1cdcb37c4b147483bb0bf8ae5","title":"Expose final response metadata without leaking intermediate representation state: redirected even return to origin · 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":37.53,"exit_code":1,"observations":[{"actual":{"decision":["/c",200,true,"ok",2,19,[301,302],2,false,301],"request":"/requests/1/0"},"check":"fixture 1","expected":{"decision":["/c",200,true,"ok",2,19,[301,302],2,false,301],"request":"/requests/1/0"},"passed":true},{"actual":{"decision":["/a",200,false,"",0,0,[],0,false,200],"request":"/requests/1/1"},"check":"fixture 2","expected":{"decision":["/a",200,false,"",0,0,[],0,false,200],"request":"/requests/1/1"},"passed":true},{"actual":{"decision":["/y",404,false,"err",3,103,[307],1,true,307],"request":"/requests/1/2"},"check":"fixture 3","expected":{"decision":["/y",404,true,"err",3,103,[307],1,true,307],"request":"/requests/1/2"},"passed":false},{"actual":{"decision":["/x",200,true,"done",4,6,[302,302],2,false,302],"request":"/requests/1/3"},"check":"fixture 4","expected":{"decision":["/x",200,true,"done",4,6,[302,302],2,false,302],"request":"/requests/1/3"},"passed":true},{"actual":{"decision":["/n",204,false,"",0,5,[308],1,false,308],"request":"/requests/1/4"},"check":"fixture 5","expected":{"decision":["/n",204,true,"",0,5,[308],1,false,308],"request":"/requests/1/4"},"passed":false},{"actual":{"decision":["/w",500,false,"bad",3,10,[303],1,true,303],"request":"/requests/1/5"},"check":"fixture 6","expected":{"decision":["/w",500,true,"bad",3,10,[303],1,true,303],"request":"/requests/1/5"},"passed":false}],"passed":false,"stderr":"","stdout":"{\"observations\": [{\"check\": \"fixture 1\", \"actual\": {\"request\": \"/requests/1/0\", \"decision\": [\"/c\", 200, true, \"ok\", 2, 19, [301, 302], 2, false, 301]}, \"expected\": {\"request\": \"/requests/1/0\", \"decision\": [\"/c\", 200, true, \"ok\", 2, 19, [301, 302], 2, false, 301]}, \"passed\": true}, {\"check\": \"fixture 2\", \"actual\": {\"request\": \"/requests/1/1\", \"decision\": [\"/a\", 200, false, \"\", 0, 0, [], 0, false, 200]}, \"expected\": {\"request\": \"/requests/1/1\", \"decision\": [\"/a\", 200, false, \"\", 0, 0, [], 0, false, 200]}, \"passed\": true}, {\"check\": \"fixture 3\", \"actual\": {\"request\": \"/requests/1/2\", \"decision\": [\"/y\", 404, false, \"err\", 3, 103, [307], 1, true, 307]}, \"expected\": {\"request\": \"/requests/1/2\", \"decision\": [\"/y\", 404, true, \"err\", 3, 103, [307], 1, true, 307]}, \"passed\": false}, {\"check\": \"fixture 4\", \"actual\": {\"request\": \"/requests/1/3\", \"decision\": [\"/x\", 200, true, \"done\", 4, 6, [302, 302], 2, false, 302]}, \"expected\": {\"request\": \"/requests/1/3\", \"decision\": [\"/x\", 200, true, \"done\", 4, 6, [302, 302], 2, false, 302]}, \"passed\": true}, {\"check\": \"fixture 5\", \"actual\": {\"request\": \"/requests/1/4\", \"decision\": [\"/n\", 204, false, \"\", 0, 5, [308], 1, false, 308]}, \"expected\": {\"request\": \"/requests/1/4\", \"decision\": [\"/n\", 204, true, \"\", 0, 5, [308], 1, false, 308]}, \"passed\": false}, {\"check\": \"fixture 6\", \"actual\": {\"request\": \"/requests/1/5\", \"decision\": [\"/w\", 500, false, \"bad\", 3, 10, [303], 1, true, 303]}, \"expected\": {\"request\": \"/requests/1/5\", \"decision\": [\"/w\", 500, true, \"bad\", 3, 10, [303], 1, true, 303]}, \"passed\": false}], \"passed\": false}\n"},"broken":{"elapsed_ms":39.984,"exit_code":1,"observations":[{"actual":{"decision":["/c",200,true,"ok",2,19,[301,302],2,false,301],"request":"/requests/1/0"},"check":"fixture 1","expected":{"decision":["/c",200,true,"ok",2,19,[301,302],2,false,301],"request":"/requests/1/0"},"passed":true},{"actual":{"decision":["/a",200,false,"",0,0,[],0,false,200],"request":"/requests/1/1"},"check":"fixture 2","expected":{"decision":["/a",200,false,"",0,0,[],0,false,200],"request":"/requests/1/1"},"passed":true},{"actual":{"decision":["/y",404,true,"err",3,103,[307],1,true,307],"request":"/requests/1/2"},"check":"fixture 3","expected":{"decision":["/y",404,true,"err",3,103,[307],1,true,307],"request":"/requests/1/2"},"passed":true},{"actual":{"decision":["/x",200,false,"done",4,6,[302,302],2,false,302],"request":"/requests/1/3"},"check":"fixture 4","expected":{"decision":["/x",200,true,"done",4,6,[302,302],2,false,302],"request":"/requests/1/3"},"passed":false},{"actual":{"decision":["/n",204,true,"",0,5,[308],1,false,308],"request":"/requests/1/4"},"check":"fixture 5","expected":{"decision":["/n",204,true,"",0,5,[308],1,false,308],"request":"/requests/1/4"},"passed":true},{"actual":{"decision":["/w",500,true,"bad",3,10,[303],1,true,303],"request":"/requests/1/5"},"check":"fixture 6","expected":{"decision":["/w",500,true,"bad",3,10,[303],1,true,303],"request":"/requests/1/5"},"passed":true}],"passed":false,"stderr":"","stdout":"{\"observations\": [{\"check\": \"fixture 1\", \"actual\": {\"request\": \"/requests/1/0\", \"decision\": [\"/c\", 200, true, \"ok\", 2, 19, [301, 302], 2, false, 301]}, \"expected\": {\"request\": \"/requests/1/0\", \"decision\": [\"/c\", 200, true, \"ok\", 2, 19, [301, 302], 2, false, 301]}, \"passed\": true}, {\"check\": \"fixture 2\", \"actual\": {\"request\": \"/requests/1/1\", \"decision\": [\"/a\", 200, false, \"\", 0, 0, [], 0, false, 200]}, \"expected\": {\"request\": \"/requests/1/1\", \"decision\": [\"/a\", 200, false, \"\", 0, 0, [], 0, false, 200]}, \"passed\": true}, {\"check\": \"fixture 3\", \"actual\": {\"request\": \"/requests/1/2\", \"decision\": [\"/y\", 404, true, \"err\", 3, 103, [307], 1, true, 307]}, \"expected\": {\"request\": \"/requests/1/2\", \"decision\": [\"/y\", 404, true, \"err\", 3, 103, [307], 1, true, 307]}, \"passed\": true}, {\"check\": \"fixture 4\", \"actual\": {\"request\": \"/requests/1/3\", \"decision\": [\"/x\", 200, false, \"done\", 4, 6, [302, 302], 2, false, 302]}, \"expected\": {\"request\": \"/requests/1/3\", \"decision\": [\"/x\", 200, true, \"done\", 4, 6, [302, 302], 2, false, 302]}, \"passed\": false}, {\"check\": \"fixture 5\", \"actual\": {\"request\": \"/requests/1/4\", \"decision\": [\"/n\", 204, true, \"\", 0, 5, [308], 1, false, 308]}, \"expected\": {\"request\": \"/requests/1/4\", \"decision\": [\"/n\", 204, true, \"\", 0, 5, [308], 1, false, 308]}, \"passed\": true}, {\"check\": \"fixture 6\", \"actual\": {\"request\": \"/requests/1/5\", \"decision\": [\"/w\", 500, true, \"bad\", 3, 10, [303], 1, true, 303]}, \"expected\": {\"request\": \"/requests/1/5\", \"decision\": [\"/w\", 500, true, \"bad\", 3, 10, [303], 1, true, 303]}, \"passed\": true}], \"passed\": false}\n"},"fixed":{"elapsed_ms":40.659,"exit_code":0,"observations":[{"actual":{"decision":["/c",200,true,"ok",2,19,[301,302],2,false,301],"request":"/requests/1/0"},"check":"fixture 1","expected":{"decision":["/c",200,true,"ok",2,19,[301,302],2,false,301],"request":"/requests/1/0"},"passed":true},{"actual":{"decision":["/a",200,false,"",0,0,[],0,false,200],"request":"/requests/1/1"},"check":"fixture 2","expected":{"decision":["/a",200,false,"",0,0,[],0,false,200],"request":"/requests/1/1"},"passed":true},{"actual":{"decision":["/y",404,true,"err",3,103,[307],1,true,307],"request":"/requests/1/2"},"check":"fixture 3","expected":{"decision":["/y",404,true,"err",3,103,[307],1,true,307],"request":"/requests/1/2"},"passed":true},{"actual":{"decision":["/x",200,true,"done",4,6,[302,302],2,false,302],"request":"/requests/1/3"},"check":"fixture 4","expected":{"decision":["/x",200,true,"done",4,6,[302,302],2,false,302],"request":"/requests/1/3"},"passed":true},{"actual":{"decision":["/n",204,true,"",0,5,[308],1,false,308],"request":"/requests/1/4"},"check":"fixture 5","expected":{"decision":["/n",204,true,"",0,5,[308],1,false,308],"request":"/requests/1/4"},"passed":true},{"actual":{"decision":["/w",500,true,"bad",3,10,[303],1,true,303],"request":"/requests/1/5"},"check":"fixture 6","expected":{"decision":["/w",500,true,"bad",3,10,[303],1,true,303],"request":"/requests/1/5"},"passed":true}],"passed":true,"stderr":"","stdout":"{\"observations\": [{\"check\": \"fixture 1\", \"actual\": {\"request\": \"/requests/1/0\", \"decision\": [\"/c\", 200, true, \"ok\", 2, 19, [301, 302], 2, false, 301]}, \"expected\": {\"request\": \"/requests/1/0\", \"decision\": [\"/c\", 200, true, \"ok\", 2, 19, [301, 302], 2, false, 301]}, \"passed\": true}, {\"check\": \"fixture 2\", \"actual\": {\"request\": \"/requests/1/1\", \"decision\": [\"/a\", 200, false, \"\", 0, 0, [], 0, false, 200]}, \"expected\": {\"request\": \"/requests/1/1\", \"decision\": [\"/a\", 200, false, \"\", 0, 0, [], 0, false, 200]}, \"passed\": true}, {\"check\": \"fixture 3\", \"actual\": {\"request\": \"/requests/1/2\", \"decision\": [\"/y\", 404, true, \"err\", 3, 103, [307], 1, true, 307]}, \"expected\": {\"request\": \"/requests/1/2\", \"decision\": [\"/y\", 404, true, \"err\", 3, 103, [307], 1, true, 307]}, \"passed\": true}, {\"check\": \"fixture 4\", \"actual\": {\"request\": \"/requests/1/3\", \"decision\": [\"/x\", 200, true, \"done\", 4, 6, [302, 302], 2, false, 302]}, \"expected\": {\"request\": \"/requests/1/3\", \"decision\": [\"/x\", 200, true, \"done\", 4, 6, [302, 302], 2, false, 302]}, \"passed\": true}, {\"check\": \"fixture 5\", \"actual\": {\"request\": \"/requests/1/4\", \"decision\": [\"/n\", 204, true, \"\", 0, 5, [308], 1, false, 308]}, \"expected\": {\"request\": \"/requests/1/4\", \"decision\": [\"/n\", 204, true, \"\", 0, 5, [308], 1, false, 308]}, \"passed\": true}, {\"check\": \"fixture 6\", \"actual\": {\"request\": \"/requests/1/5\", \"decision\": [\"/w\", 500, true, \"bad\", 3, 10, [303], 1, true, 303]}, \"expected\": {\"request\": \"/requests/1/5\", \"decision\": [\"/w\", 500, true, \"bad\", 3, 10, [303], 1, true, 303]}, \"passed\": true}], \"passed\": true}\n"}},"verified":true,"visibility":"public"}