{"abstract":"A redirect without a fragment inherits the original fragment.","category":"HTTP redirects","checks":4,"contract":"A redirect without a fragment inherits the original fragment: return the result specified by the explicit input/output boundary fixtures.","contract_signature":"old, location","evaluation_group":"xh-redirect-fragment","failed_approach":"The attempted repair uses `location + ('#' + old.split('#',1)[1] if '#' in old else '')` and still violates a separate fixture.","family":"xh-redirect-fragment","id":"FA-6641","implementations":{"attempt":{"sha256":"9f1b6e65c8b62d80976d56d37fca49481b15d315a9566654c51ebf6166a0f48d","source":"\"\"\"Failure Map reference implementation. Python standard library only.\"\"\"\nimport json\nimport ipaddress\nimport re\nfrom urllib.parse import urlsplit, urljoin\nN = 1\nobservations = []\ndef solve(old, location):\n    return location + ('#' + old.split('#',1)[1] if '#' in old else '')\ndef check(label, actual, expected):\n    observations.append({\"check\": label, \"actual\": actual, \"expected\": expected, \"passed\": actual == expected})\n_fixtures = [\"check('fixture 1', solve('/a#x', '/b'), '/b#x')\", \"check('fixture 2', solve('/a#x', '/b#y'), '/b#y')\", \"check('fixture 3', solve('/a', '/b'), '/b')\", \"check('fixture 4', solve('/a#x', '/b#'), '/b#')\"]\nfor _line in _fixtures[N % len(_fixtures):] + _fixtures[:N % len(_fixtures)]:\n    exec(_line)\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":"91500471fa8468dc6028f9d81c4d14844eb889c8bee3f44bc74fa583378818c1","source":"\"\"\"Failure Map reference implementation. Python standard library only.\"\"\"\nimport json\nimport ipaddress\nimport re\nfrom urllib.parse import urlsplit, urljoin\nN = 1\nobservations = []\ndef solve(old, location):\n    return location\ndef check(label, actual, expected):\n    observations.append({\"check\": label, \"actual\": actual, \"expected\": expected, \"passed\": actual == expected})\n_fixtures = [\"check('fixture 1', solve('/a#x', '/b'), '/b#x')\", \"check('fixture 2', solve('/a#x', '/b#y'), '/b#y')\", \"check('fixture 3', solve('/a', '/b'), '/b')\", \"check('fixture 4', solve('/a#x', '/b#'), '/b#')\"]\nfor _line in _fixtures[N % len(_fixtures):] + _fixtures[:N % len(_fixtures)]:\n    exec(_line)\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":"Bounded deterministic policy model over validated inputs; not a complete protocol stack or an interoperability claim. The five variants rotate the same explicit fixture set. 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":"xh-redirect-fragment","generated_at":"2026-09-29T14:38:03.891851+00:00","license":"CC0-1.0","python":"3.12.14","seed":1,"split":"open-access"},"relevance":"This deterministic http redirects model isolates the redirect-fragment policy at a network component boundary.","root_cause":"The faulty implementation uses `location` for the redirect-fragment decision.","sha256":"8789402dd2fb8f840ce8a00f0f446f38bb0b94fc38bf28bd58077a962f54501a","title":"A redirect without a fragment inherits the original fragment · case 01","variant":1,"variant_policy":"Five numbered records share a model and may reuse boundary fixtures.","verified":true,"visibility":"public","verification":{"attempt":{"elapsed_ms":37.231,"exit_code":1,"observations":[{"actual":"/b#y#x","check":"fixture 2","expected":"/b#y","passed":false},{"actual":"/b","check":"fixture 3","expected":"/b","passed":true},{"actual":"/b##x","check":"fixture 4","expected":"/b#","passed":false},{"actual":"/b#x","check":"fixture 1","expected":"/b#x","passed":true}],"passed":false,"stderr":"","stdout":"{\"observations\": [{\"check\": \"fixture 2\", \"actual\": \"/b#y#x\", \"expected\": \"/b#y\", \"passed\": false}, {\"check\": \"fixture 3\", \"actual\": \"/b\", \"expected\": \"/b\", \"passed\": true}, {\"check\": \"fixture 4\", \"actual\": \"/b##x\", \"expected\": \"/b#\", \"passed\": false}, {\"check\": \"fixture 1\", \"actual\": \"/b#x\", \"expected\": \"/b#x\", \"passed\": true}], \"passed\": false}\n"},"broken":{"elapsed_ms":38.098,"exit_code":1,"observations":[{"actual":"/b#y","check":"fixture 2","expected":"/b#y","passed":true},{"actual":"/b","check":"fixture 3","expected":"/b","passed":true},{"actual":"/b#","check":"fixture 4","expected":"/b#","passed":true},{"actual":"/b","check":"fixture 1","expected":"/b#x","passed":false}],"passed":false,"stderr":"","stdout":"{\"observations\": [{\"check\": \"fixture 2\", \"actual\": \"/b#y\", \"expected\": \"/b#y\", \"passed\": true}, {\"check\": \"fixture 3\", \"actual\": \"/b\", \"expected\": \"/b\", \"passed\": true}, {\"check\": \"fixture 4\", \"actual\": \"/b#\", \"expected\": \"/b#\", \"passed\": true}, {\"check\": \"fixture 1\", \"actual\": \"/b\", \"expected\": \"/b#x\", \"passed\": false}], \"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."}}