{"abstract":"A tunneled stream is mistakenly interpreted by the outer redirect controller.","category":"HTTP redirects","checks":6,"contract":"Admit only actionable redirect responses. The explicit fixture inputs and outputs define a bounded offline policy; request identity must accompany the decision.","contract_signature":"request, status, location, informational, tunnel, mode","evaluation_group":"s3-http-redirects-response-admission","failed_approach":"The partial repair uses 'not tunnel and status != 307' and still fails an explicit boundary or control.","family":"s3-http-redirects-response-admission-tunnel-ownership","id":"FA-27876","implementations":{"attempt":{"sha256":"2fb6b51ac0777465243c6976f61a5b616283f3bee7a115766dd858258bf88f2a","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, status, location, informational, tunnel, mode):\n    return {'request': request, 'decision': [status in (301,302,303,307,308), not informational, not tunnel and status != 307, mode == 'manual', location == '']} \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', 300, '/a', False, False, 'follow'), {'request': '/requests/' + str(N) + '/0', 'decision': [False, True, True, False, False]})\ncheck('fixture 2', solve('/requests/' + str(N) + '/1', 303, '/b', True, True, 'manual'), {'request': '/requests/' + str(N) + '/1', 'decision': [True, False, False, True, False]})\ncheck('fixture 3', solve('/requests/' + str(N) + '/2', 307, '', False, False, 'error'), {'request': '/requests/' + str(N) + '/2', 'decision': [True, True, True, False, True]})\ncheck('fixture 4', solve('/requests/' + str(N) + '/3', 304, None, False, True, 'follow'), {'request': '/requests/' + str(N) + '/3', 'decision': [False, True, False, False, False]})\ncheck('fixture 5', solve('/requests/' + str(N) + '/4', 308, '/c', False, False, 'manual'), {'request': '/requests/' + str(N) + '/4', 'decision': [True, True, True, True, False]})\ncheck('fixture 6', solve('/requests/' + str(N) + '/5', 200, '/d', False, False, 'follow'), {'request': '/requests/' + str(N) + '/5', 'decision': [False, True, True, 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":"20004944d1c05bb9e38fe8a41d4ca780a5e668ba017ce10bcfdd3bdf36863bfa","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, status, location, informational, tunnel, mode):\n    return {'request': request, 'decision': [status in (301,302,303,307,308), not informational, True, mode == 'manual', location == '']} \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', 300, '/a', False, False, 'follow'), {'request': '/requests/' + str(N) + '/0', 'decision': [False, True, True, False, False]})\ncheck('fixture 2', solve('/requests/' + str(N) + '/1', 303, '/b', True, True, 'manual'), {'request': '/requests/' + str(N) + '/1', 'decision': [True, False, False, True, False]})\ncheck('fixture 3', solve('/requests/' + str(N) + '/2', 307, '', False, False, 'error'), {'request': '/requests/' + str(N) + '/2', 'decision': [True, True, True, False, True]})\ncheck('fixture 4', solve('/requests/' + str(N) + '/3', 304, None, False, True, 'follow'), {'request': '/requests/' + str(N) + '/3', 'decision': [False, True, False, False, False]})\ncheck('fixture 5', solve('/requests/' + str(N) + '/4', 308, '/c', False, False, 'manual'), {'request': '/requests/' + str(N) + '/4', 'decision': [True, True, True, True, False]})\ncheck('fixture 6', solve('/requests/' + str(N) + '/5', 200, '/d', False, False, 'follow'), {'request': '/requests/' + str(N) + '/5', 'decision': [False, True, True, 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-response-admission-tunnel-ownership","generated_at":"2026-09-29T14:41:28.997733+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 tunnel-ownership decision uses 'True'; this violates the stipulated controller policy.","sha256":"ab3aa02190c891d74525d09868f045cd4921f8b4fd6ecfbedd3be8b40c77a0a2","title":"Admit only actionable redirect responses: tunnel ownership · 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":39.593,"exit_code":1,"observations":[{"actual":{"decision":[false,true,true,false,false],"request":"/requests/1/0"},"check":"fixture 1","expected":{"decision":[false,true,true,false,false],"request":"/requests/1/0"},"passed":true},{"actual":{"decision":[true,false,false,true,false],"request":"/requests/1/1"},"check":"fixture 2","expected":{"decision":[true,false,false,true,false],"request":"/requests/1/1"},"passed":true},{"actual":{"decision":[true,true,false,false,true],"request":"/requests/1/2"},"check":"fixture 3","expected":{"decision":[true,true,true,false,true],"request":"/requests/1/2"},"passed":false},{"actual":{"decision":[false,true,false,false,false],"request":"/requests/1/3"},"check":"fixture 4","expected":{"decision":[false,true,false,false,false],"request":"/requests/1/3"},"passed":true},{"actual":{"decision":[true,true,true,true,false],"request":"/requests/1/4"},"check":"fixture 5","expected":{"decision":[true,true,true,true,false],"request":"/requests/1/4"},"passed":true},{"actual":{"decision":[false,true,true,false,false],"request":"/requests/1/5"},"check":"fixture 6","expected":{"decision":[false,true,true,false,false],"request":"/requests/1/5"},"passed":true}],"passed":false,"stderr":"","stdout":"{\"observations\": [{\"check\": \"fixture 1\", \"actual\": {\"request\": \"/requests/1/0\", \"decision\": [false, true, true, false, false]}, \"expected\": {\"request\": \"/requests/1/0\", \"decision\": [false, true, true, false, false]}, \"passed\": true}, {\"check\": \"fixture 2\", \"actual\": {\"request\": \"/requests/1/1\", \"decision\": [true, false, false, true, false]}, \"expected\": {\"request\": \"/requests/1/1\", \"decision\": [true, false, false, true, false]}, \"passed\": true}, {\"check\": \"fixture 3\", \"actual\": {\"request\": \"/requests/1/2\", \"decision\": [true, true, false, false, true]}, \"expected\": {\"request\": \"/requests/1/2\", \"decision\": [true, true, true, false, true]}, \"passed\": false}, {\"check\": \"fixture 4\", \"actual\": {\"request\": \"/requests/1/3\", \"decision\": [false, true, false, false, false]}, \"expected\": {\"request\": \"/requests/1/3\", \"decision\": [false, true, false, false, false]}, \"passed\": true}, {\"check\": \"fixture 5\", \"actual\": {\"request\": \"/requests/1/4\", \"decision\": [true, true, true, true, false]}, \"expected\": {\"request\": \"/requests/1/4\", \"decision\": [true, true, true, true, false]}, \"passed\": true}, {\"check\": \"fixture 6\", \"actual\": {\"request\": \"/requests/1/5\", \"decision\": [false, true, true, false, false]}, \"expected\": {\"request\": \"/requests/1/5\", \"decision\": [false, true, true, false, false]}, \"passed\": true}], \"passed\": false}\n"},"broken":{"elapsed_ms":37.779,"exit_code":1,"observations":[{"actual":{"decision":[false,true,true,false,false],"request":"/requests/1/0"},"check":"fixture 1","expected":{"decision":[false,true,true,false,false],"request":"/requests/1/0"},"passed":true},{"actual":{"decision":[true,false,true,true,false],"request":"/requests/1/1"},"check":"fixture 2","expected":{"decision":[true,false,false,true,false],"request":"/requests/1/1"},"passed":false},{"actual":{"decision":[true,true,true,false,true],"request":"/requests/1/2"},"check":"fixture 3","expected":{"decision":[true,true,true,false,true],"request":"/requests/1/2"},"passed":true},{"actual":{"decision":[false,true,true,false,false],"request":"/requests/1/3"},"check":"fixture 4","expected":{"decision":[false,true,false,false,false],"request":"/requests/1/3"},"passed":false},{"actual":{"decision":[true,true,true,true,false],"request":"/requests/1/4"},"check":"fixture 5","expected":{"decision":[true,true,true,true,false],"request":"/requests/1/4"},"passed":true},{"actual":{"decision":[false,true,true,false,false],"request":"/requests/1/5"},"check":"fixture 6","expected":{"decision":[false,true,true,false,false],"request":"/requests/1/5"},"passed":true}],"passed":false,"stderr":"","stdout":"{\"observations\": [{\"check\": \"fixture 1\", \"actual\": {\"request\": \"/requests/1/0\", \"decision\": [false, true, true, false, false]}, \"expected\": {\"request\": \"/requests/1/0\", \"decision\": [false, true, true, false, false]}, \"passed\": true}, {\"check\": \"fixture 2\", \"actual\": {\"request\": \"/requests/1/1\", \"decision\": [true, false, true, true, false]}, \"expected\": {\"request\": \"/requests/1/1\", \"decision\": [true, false, false, true, false]}, \"passed\": false}, {\"check\": \"fixture 3\", \"actual\": {\"request\": \"/requests/1/2\", \"decision\": [true, true, true, false, true]}, \"expected\": {\"request\": \"/requests/1/2\", \"decision\": [true, true, true, false, true]}, \"passed\": true}, {\"check\": \"fixture 4\", \"actual\": {\"request\": \"/requests/1/3\", \"decision\": [false, true, true, false, false]}, \"expected\": {\"request\": \"/requests/1/3\", \"decision\": [false, true, false, false, false]}, \"passed\": false}, {\"check\": \"fixture 5\", \"actual\": {\"request\": \"/requests/1/4\", \"decision\": [true, true, true, true, false]}, \"expected\": {\"request\": \"/requests/1/4\", \"decision\": [true, true, true, true, false]}, \"passed\": true}, {\"check\": \"fixture 6\", \"actual\": {\"request\": \"/requests/1/5\", \"decision\": [false, true, true, false, false]}, \"expected\": {\"request\": \"/requests/1/5\", \"decision\": [false, true, true, false, 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."}}