{"abstract":"Wildcard vary absorbs other vary fields.","category":"Content negotiation","checks":4,"contract":"Bounded offline decision model: wildcard vary absorbs other vary fields. Inputs are already validated protocol fields; the explicit fixtures define the supported policy, not a complete protocol implementation.","evaluation_group":"xh-wildcard-vary-absorbs-other-vary-fields","failed_approach":"The attempted repair uses `['*'] if fields else []` and still violates a separate fixture.","family":"xh-wildcard-vary-absorbs-other-vary-fields","id":"FA-6916","implementations":{"attempt":{"sha256":"009e2bd7d66785699caf71789dbdd13d8ac316ef54707a009b29c4d2822e22d2","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(fields):\n    return ['*'] if fields else []\ndef check(label, actual, expected):\n    observations.append({\"check\": label, \"actual\": actual, \"expected\": expected, \"passed\": actual == expected})\n_fixtures = [\"check('fixture 1', solve(['accept', '*']), ['*'])\", \"check('fixture 2', solve(['accept']), ['accept'])\", \"check('fixture 3', solve([]), [])\", \"check('fixture 4', solve(['*']), ['*'])\"]\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":"038797f8a7ea0e9478488ec8cd028f6f4d5b53bcbd39465c0d737ead1c8c1b38","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(fields):\n    return fields\ndef check(label, actual, expected):\n    observations.append({\"check\": label, \"actual\": actual, \"expected\": expected, \"passed\": actual == expected})\n_fixtures = [\"check('fixture 1', solve(['accept', '*']), ['*'])\", \"check('fixture 2', solve(['accept']), ['accept'])\", \"check('fixture 3', solve([]), [])\", \"check('fixture 4', solve(['*']), ['*'])\"]\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":"7d747032d78277a6f8c0c22d137d3ae8b7baf1efa3538bf6b6ed48443e5fba3d","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(fields):\n    return ['*'] if '*' in fields else fields\ndef check(label, actual, expected):\n    observations.append({\"check\": label, \"actual\": actual, \"expected\": expected, \"passed\": actual == expected})\n_fixtures = [\"check('fixture 1', solve(['accept', '*']), ['*'])\", \"check('fixture 2', solve(['accept']), ['accept'])\", \"check('fixture 3', solve([]), [])\", \"check('fixture 4', solve(['*']), ['*'])\"]\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-wildcard-vary-absorbs-other-vary-fields","generated_at":"2026-09-29T14:38:06.440994+00:00","license":"CC0-1.0","python":"3.12.14","seed":1,"split":"open-access"},"relevance":"This deterministic content negotiation model isolates the wildcard-vary-absorbs-other-vary-fields policy at a network component boundary.","repair":"Apply the explicit wildcard-vary-absorbs-other-vary-fields contract, including the tested boundary and negative cases.","root_cause":"The faulty implementation uses `fields` for the wildcard-vary-absorbs-other-vary-fields decision.","sha256":"52bfe002d9e94332a222a95c5b6aa7e342237eb2c3e735463238eb0f3e609a2c","title":"Wildcard vary absorbs other vary fields · case 01","variant":1,"variant_policy":"Five numbered records share a model and may reuse boundary fixtures.","verification":{"attempt":{"elapsed_ms":37.88,"exit_code":1,"observations":[{"actual":["*"],"check":"fixture 2","expected":["accept"],"passed":false},{"actual":[],"check":"fixture 3","expected":[],"passed":true},{"actual":["*"],"check":"fixture 4","expected":["*"],"passed":true},{"actual":["*"],"check":"fixture 1","expected":["*"],"passed":true}],"passed":false,"stderr":"","stdout":"{\"observations\": [{\"check\": \"fixture 2\", \"actual\": [\"*\"], \"expected\": [\"accept\"], \"passed\": false}, {\"check\": \"fixture 3\", \"actual\": [], \"expected\": [], \"passed\": true}, {\"check\": \"fixture 4\", \"actual\": [\"*\"], \"expected\": [\"*\"], \"passed\": true}, {\"check\": \"fixture 1\", \"actual\": [\"*\"], \"expected\": [\"*\"], \"passed\": true}], \"passed\": false}\n"},"broken":{"elapsed_ms":40.995,"exit_code":1,"observations":[{"actual":["accept"],"check":"fixture 2","expected":["accept"],"passed":true},{"actual":[],"check":"fixture 3","expected":[],"passed":true},{"actual":["*"],"check":"fixture 4","expected":["*"],"passed":true},{"actual":["accept","*"],"check":"fixture 1","expected":["*"],"passed":false}],"passed":false,"stderr":"","stdout":"{\"observations\": [{\"check\": \"fixture 2\", \"actual\": [\"accept\"], \"expected\": [\"accept\"], \"passed\": true}, {\"check\": \"fixture 3\", \"actual\": [], \"expected\": [], \"passed\": true}, {\"check\": \"fixture 4\", \"actual\": [\"*\"], \"expected\": [\"*\"], \"passed\": true}, {\"check\": \"fixture 1\", \"actual\": [\"accept\", \"*\"], \"expected\": [\"*\"], \"passed\": false}], \"passed\": false}\n"},"fixed":{"elapsed_ms":39.427,"exit_code":0,"observations":[{"actual":["accept"],"check":"fixture 2","expected":["accept"],"passed":true},{"actual":[],"check":"fixture 3","expected":[],"passed":true},{"actual":["*"],"check":"fixture 4","expected":["*"],"passed":true},{"actual":["*"],"check":"fixture 1","expected":["*"],"passed":true}],"passed":true,"stderr":"","stdout":"{\"observations\": [{\"check\": \"fixture 2\", \"actual\": [\"accept\"], \"expected\": [\"accept\"], \"passed\": true}, {\"check\": \"fixture 3\", \"actual\": [], \"expected\": [], \"passed\": true}, {\"check\": \"fixture 4\", \"actual\": [\"*\"], \"expected\": [\"*\"], \"passed\": true}, {\"check\": \"fixture 1\", \"actual\": [\"*\"], \"expected\": [\"*\"], \"passed\": true}], \"passed\": true}\n"}},"verified":true,"visibility":"public"}