{"abstract":"An absent target and an explicitly empty target receive the same diagnostic.","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.","evaluation_group":"s3-http-redirects-response-admission","failed_approach":"The partial repair uses 'not location' and still fails an explicit boundary or control.","family":"s3-http-redirects-response-admission-empty-target-error","id":"FA-27886","implementations":{"attempt":{"sha256":"ff0f28790fa8b7dacae913b2069225aca303bd3aa45793eaac5a6b0814648c7c","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, mode == 'manual', not 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":"cc0be80191dbd89a834fd39d4dfbe5ef96eeb99be80f1a87d02c2b173e56966e","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, mode == 'manual', location is None]} \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"},"fixed":{"sha256":"6600a850f7d09737f6ce24d7f2dc287d11ab58b683794787629988cc7ba5f99d","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, 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-empty-target-error","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.","repair":"At this decision use \"location == ''\", preserving the other controller outputs.","root_cause":"The empty-target-error decision uses 'location is None'; this violates the stipulated controller policy.","sha256":"192f02e5da6cf20f8d30fd25c73817d23a2ad509df719713b03b555c0af77530","title":"Admit only actionable redirect responses: empty target error · 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":39.192,"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,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,false,false,true],"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, 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, 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, false, false, true]}, \"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"},"broken":{"elapsed_ms":39.275,"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,true,false,false],"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,true],"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, 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, true, false, false]}, \"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, true]}, \"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"},"fixed":{"elapsed_ms":38.058,"exit_code":0,"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,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,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":true,"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, 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, 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\": true}\n"}},"verified":true,"visibility":"public"}