{"abstract":"Cache key retains query but discards fragment.","category":"HTTP caching","checks":4,"contract":"Bounded offline decision model: cache key retains query but discards fragment. Inputs are already validated protocol fields; the explicit fixtures define the supported policy, not a complete protocol implementation.","evaluation_group":"xh-cache-key-retains-query-but-discards-fragment","failed_approach":"The attempted repair uses `url.split('?',1)[0].split('#',1)[0]` and still violates a separate fixture.","family":"xh-cache-key-retains-query-but-discards-fragment","id":"FA-6771","implementations":{"attempt":{"sha256":"617e6f241b8d78862dfd86ab73f443001cc50429ea2023fabcdd56996f0a2e01","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(url):\n    return url.split('?',1)[0].split('#',1)[0]\ndef check(label, actual, expected):\n    observations.append({\"check\": label, \"actual\": actual, \"expected\": expected, \"passed\": actual == expected})\n_fixtures = [\"check('fixture 1', solve('/a?q=1#x'), '/a?q=1')\", \"check('fixture 2', solve('/a?q=2'), '/a?q=2')\", \"check('fixture 3', solve('/a#x'), '/a')\", \"check('fixture 4', solve('/a'), '/a')\"]\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":"b25b8e8ab96a651a8efbf461104bf649c6e5d7db1adbe06c623c77602a5239ba","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(url):\n    return url\ndef check(label, actual, expected):\n    observations.append({\"check\": label, \"actual\": actual, \"expected\": expected, \"passed\": actual == expected})\n_fixtures = [\"check('fixture 1', solve('/a?q=1#x'), '/a?q=1')\", \"check('fixture 2', solve('/a?q=2'), '/a?q=2')\", \"check('fixture 3', solve('/a#x'), '/a')\", \"check('fixture 4', solve('/a'), '/a')\"]\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"},"fixed":{"sha256":"5b16e96276436e6b3d9bf61118bce43cfce507f13fde83dc1786be1ebdf38eeb","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(url):\n    return url.split('#',1)[0]\ndef check(label, actual, expected):\n    observations.append({\"check\": label, \"actual\": actual, \"expected\": expected, \"passed\": actual == expected})\n_fixtures = [\"check('fixture 1', solve('/a?q=1#x'), '/a?q=1')\", \"check('fixture 2', solve('/a?q=2'), '/a?q=2')\", \"check('fixture 3', solve('/a#x'), '/a')\", \"check('fixture 4', solve('/a'), '/a')\"]\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-cache-key-retains-query-but-discards-fragment","generated_at":"2026-09-29T14:38:04.984318+00:00","license":"CC0-1.0","python":"3.12.14","seed":1,"split":"open-access"},"relevance":"This deterministic http caching model isolates the cache-key-retains-query-but-discards-fragment policy at a network component boundary.","repair":"Apply the explicit cache-key-retains-query-but-discards-fragment contract, including the tested boundary and negative cases.","root_cause":"The faulty implementation uses `url` for the cache-key-retains-query-but-discards-fragment decision.","sha256":"931d8cea219148b37654ee72f0116e1126c7e66dc745ef69f3ae8e36a25fd0ad","title":"Cache key retains query but discards fragment · case 01","variant":1,"variant_policy":"Five numbered records share a model and may reuse boundary fixtures.","verification":{"attempt":{"elapsed_ms":36.665,"exit_code":1,"observations":[{"actual":"/a","check":"fixture 2","expected":"/a?q=2","passed":false},{"actual":"/a","check":"fixture 3","expected":"/a","passed":true},{"actual":"/a","check":"fixture 4","expected":"/a","passed":true},{"actual":"/a","check":"fixture 1","expected":"/a?q=1","passed":false}],"passed":false,"stderr":"","stdout":"{\"observations\": [{\"check\": \"fixture 2\", \"actual\": \"/a\", \"expected\": \"/a?q=2\", \"passed\": false}, {\"check\": \"fixture 3\", \"actual\": \"/a\", \"expected\": \"/a\", \"passed\": true}, {\"check\": \"fixture 4\", \"actual\": \"/a\", \"expected\": \"/a\", \"passed\": true}, {\"check\": \"fixture 1\", \"actual\": \"/a\", \"expected\": \"/a?q=1\", \"passed\": false}], \"passed\": false}\n"},"broken":{"elapsed_ms":37.772,"exit_code":1,"observations":[{"actual":"/a?q=2","check":"fixture 2","expected":"/a?q=2","passed":true},{"actual":"/a#x","check":"fixture 3","expected":"/a","passed":false},{"actual":"/a","check":"fixture 4","expected":"/a","passed":true},{"actual":"/a?q=1#x","check":"fixture 1","expected":"/a?q=1","passed":false}],"passed":false,"stderr":"","stdout":"{\"observations\": [{\"check\": \"fixture 2\", \"actual\": \"/a?q=2\", \"expected\": \"/a?q=2\", \"passed\": true}, {\"check\": \"fixture 3\", \"actual\": \"/a#x\", \"expected\": \"/a\", \"passed\": false}, {\"check\": \"fixture 4\", \"actual\": \"/a\", \"expected\": \"/a\", \"passed\": true}, {\"check\": \"fixture 1\", \"actual\": \"/a?q=1#x\", \"expected\": \"/a?q=1\", \"passed\": false}], \"passed\": false}\n"},"fixed":{"elapsed_ms":35.992,"exit_code":0,"observations":[{"actual":"/a?q=2","check":"fixture 2","expected":"/a?q=2","passed":true},{"actual":"/a","check":"fixture 3","expected":"/a","passed":true},{"actual":"/a","check":"fixture 4","expected":"/a","passed":true},{"actual":"/a?q=1","check":"fixture 1","expected":"/a?q=1","passed":true}],"passed":true,"stderr":"","stdout":"{\"observations\": [{\"check\": \"fixture 2\", \"actual\": \"/a?q=2\", \"expected\": \"/a?q=2\", \"passed\": true}, {\"check\": \"fixture 3\", \"actual\": \"/a\", \"expected\": \"/a\", \"passed\": true}, {\"check\": \"fixture 4\", \"actual\": \"/a\", \"expected\": \"/a\", \"passed\": true}, {\"check\": \"fixture 1\", \"actual\": \"/a?q=1\", \"expected\": \"/a?q=1\", \"passed\": true}], \"passed\": true}\n"}},"verified":true,"visibility":"public"}