{"abstract":"A byte-range client rejects partial metadata in a different unit.","category":"HTTP ranges","checks":6,"contract":"Parsed units are case-normalized tokens. Accept payload only when units match exactly; otherwise None.","evaluation_group":"s3-http_ranges-response-metadata","failed_approach":"The partial repair uses return body if actual_unit.startswith(expected_unit) else None, which still violates the stated contract.","family":"s3-http_ranges-content-range-unit-mismatch","id":"FA-26726","implementations":{"attempt":{"sha256":"477230bf3b06231b141d87a33b38b45f9c7485114c83a9ee22989037c856d87f","source":"\"\"\"Failure Map reference implementation. Python standard library only.\"\"\"\nimport json\n\nN = 1\nobservations = []\ndef solve(expected_unit, actual_unit, body):\n    return body if actual_unit.startswith(expected_unit) else None\ndef check(label, actual, expected):\n    observations.append({\"check\": label, \"actual\": actual, \"expected\": expected, \"passed\": actual == expected})\ncheck('content-range-unit-mismatch fixture 0', solve(\"bytes\",\"bytesx\",\"p\"*N), None)\ncheck('content-range-unit-mismatch fixture 1', solve(\"bytes\",\"items\",\"p\"), None)\ncheck('content-range-unit-mismatch fixture 2', solve(\"bytes\",\"bytes\",\"p\"*N), \"p\"*N)\ncheck('content-range-unit-mismatch fixture 3', solve(\"items\",\"items\",\"p\"), \"p\")\ncheck('content-range-unit-mismatch fixture 4', solve(\"bytes\",\"\",\"p\"), None)\ncheck('content-range-unit-mismatch fixture 5', solve(\"bytes\",\"bytes\",\"\"), \"\")\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":"b44b18e972c2d2d3f9dfd199add00ba81369bfb173259d8075b516ef228854cf","source":"\"\"\"Failure Map reference implementation. Python standard library only.\"\"\"\nimport json\n\nN = 1\nobservations = []\ndef solve(expected_unit, actual_unit, body):\n    return body\ndef check(label, actual, expected):\n    observations.append({\"check\": label, \"actual\": actual, \"expected\": expected, \"passed\": actual == expected})\ncheck('content-range-unit-mismatch fixture 0', solve(\"bytes\",\"bytesx\",\"p\"*N), None)\ncheck('content-range-unit-mismatch fixture 1', solve(\"bytes\",\"items\",\"p\"), None)\ncheck('content-range-unit-mismatch fixture 2', solve(\"bytes\",\"bytes\",\"p\"*N), \"p\"*N)\ncheck('content-range-unit-mismatch fixture 3', solve(\"items\",\"items\",\"p\"), \"p\")\ncheck('content-range-unit-mismatch fixture 4', solve(\"bytes\",\"\",\"p\"), None)\ncheck('content-range-unit-mismatch fixture 5', solve(\"bytes\",\"bytes\",\"\"), \"\")\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":"ac769f8eea840b0f9238b3b84bae2f1a06f5ac9ea8d15f04d8dcdde83c4f7d73","source":"\"\"\"Failure Map reference implementation. Python standard library only.\"\"\"\nimport json\n\nN = 1\nobservations = []\ndef solve(expected_unit, actual_unit, body):\n    return body if actual_unit==expected_unit else None\ndef check(label, actual, expected):\n    observations.append({\"check\": label, \"actual\": actual, \"expected\": expected, \"passed\": actual == expected})\ncheck('content-range-unit-mismatch fixture 0', solve(\"bytes\",\"bytesx\",\"p\"*N), None)\ncheck('content-range-unit-mismatch fixture 1', solve(\"bytes\",\"items\",\"p\"), None)\ncheck('content-range-unit-mismatch fixture 2', solve(\"bytes\",\"bytes\",\"p\"*N), \"p\"*N)\ncheck('content-range-unit-mismatch fixture 3', solve(\"items\",\"items\",\"p\"), \"p\")\ncheck('content-range-unit-mismatch fixture 4', solve(\"bytes\",\"\",\"p\"), None)\ncheck('content-range-unit-mismatch fixture 5', solve(\"bytes\",\"bytes\",\"\"), \"\")\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":"Deterministic simplified range service, with stipulated local policies and already parsed trusted inputs; not a complete HTTP implementation. 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_ranges-content-range-unit-mismatch","generated_at":"2026-09-29T14:41:18.610509+00:00","license":"CC0-1.0","python":"3.12.14","seed":1,"split":"open-access"},"relevance":"Range responses combine representation identity, conditional requests, framing, and partial-object state.","repair":"Apply the bounded decision exactly: return body if actual_unit==expected_unit else None","root_cause":"The content-range-unit-mismatch decision uses return body.","sha256":"e13c0b8adfef26d0c0e355742dbf06166cb458c67603f884e9bbadc44d331c3b","title":"A byte-range client rejects partial metadata in a different unit · case 01","variant":1,"variant_policy":"Five numbered records share a model and may reuse boundary fixtures.","verification":{"attempt":{"elapsed_ms":42.764,"exit_code":1,"observations":[{"actual":"p","check":"content-range-unit-mismatch fixture 0","expected":null,"passed":false},{"actual":null,"check":"content-range-unit-mismatch fixture 1","expected":null,"passed":true},{"actual":"p","check":"content-range-unit-mismatch fixture 2","expected":"p","passed":true},{"actual":"p","check":"content-range-unit-mismatch fixture 3","expected":"p","passed":true},{"actual":null,"check":"content-range-unit-mismatch fixture 4","expected":null,"passed":true},{"actual":"","check":"content-range-unit-mismatch fixture 5","expected":"","passed":true}],"passed":false,"stderr":"","stdout":"{\"observations\": [{\"check\": \"content-range-unit-mismatch fixture 0\", \"actual\": \"p\", \"expected\": null, \"passed\": false}, {\"check\": \"content-range-unit-mismatch fixture 1\", \"actual\": null, \"expected\": null, \"passed\": true}, {\"check\": \"content-range-unit-mismatch fixture 2\", \"actual\": \"p\", \"expected\": \"p\", \"passed\": true}, {\"check\": \"content-range-unit-mismatch fixture 3\", \"actual\": \"p\", \"expected\": \"p\", \"passed\": true}, {\"check\": \"content-range-unit-mismatch fixture 4\", \"actual\": null, \"expected\": null, \"passed\": true}, {\"check\": \"content-range-unit-mismatch fixture 5\", \"actual\": \"\", \"expected\": \"\", \"passed\": true}], \"passed\": false}\n"},"broken":{"elapsed_ms":39.172,"exit_code":1,"observations":[{"actual":"p","check":"content-range-unit-mismatch fixture 0","expected":null,"passed":false},{"actual":"p","check":"content-range-unit-mismatch fixture 1","expected":null,"passed":false},{"actual":"p","check":"content-range-unit-mismatch fixture 2","expected":"p","passed":true},{"actual":"p","check":"content-range-unit-mismatch fixture 3","expected":"p","passed":true},{"actual":"p","check":"content-range-unit-mismatch fixture 4","expected":null,"passed":false},{"actual":"","check":"content-range-unit-mismatch fixture 5","expected":"","passed":true}],"passed":false,"stderr":"","stdout":"{\"observations\": [{\"check\": \"content-range-unit-mismatch fixture 0\", \"actual\": \"p\", \"expected\": null, \"passed\": false}, {\"check\": \"content-range-unit-mismatch fixture 1\", \"actual\": \"p\", \"expected\": null, \"passed\": false}, {\"check\": \"content-range-unit-mismatch fixture 2\", \"actual\": \"p\", \"expected\": \"p\", \"passed\": true}, {\"check\": \"content-range-unit-mismatch fixture 3\", \"actual\": \"p\", \"expected\": \"p\", \"passed\": true}, {\"check\": \"content-range-unit-mismatch fixture 4\", \"actual\": \"p\", \"expected\": null, \"passed\": false}, {\"check\": \"content-range-unit-mismatch fixture 5\", \"actual\": \"\", \"expected\": \"\", \"passed\": true}], \"passed\": false}\n"},"fixed":{"elapsed_ms":40.264,"exit_code":0,"observations":[{"actual":null,"check":"content-range-unit-mismatch fixture 0","expected":null,"passed":true},{"actual":null,"check":"content-range-unit-mismatch fixture 1","expected":null,"passed":true},{"actual":"p","check":"content-range-unit-mismatch fixture 2","expected":"p","passed":true},{"actual":"p","check":"content-range-unit-mismatch fixture 3","expected":"p","passed":true},{"actual":null,"check":"content-range-unit-mismatch fixture 4","expected":null,"passed":true},{"actual":"","check":"content-range-unit-mismatch fixture 5","expected":"","passed":true}],"passed":true,"stderr":"","stdout":"{\"observations\": [{\"check\": \"content-range-unit-mismatch fixture 0\", \"actual\": null, \"expected\": null, \"passed\": true}, {\"check\": \"content-range-unit-mismatch fixture 1\", \"actual\": null, \"expected\": null, \"passed\": true}, {\"check\": \"content-range-unit-mismatch fixture 2\", \"actual\": \"p\", \"expected\": \"p\", \"passed\": true}, {\"check\": \"content-range-unit-mismatch fixture 3\", \"actual\": \"p\", \"expected\": \"p\", \"passed\": true}, {\"check\": \"content-range-unit-mismatch fixture 4\", \"actual\": null, \"expected\": null, \"passed\": true}, {\"check\": \"content-range-unit-mismatch fixture 5\", \"actual\": \"\", \"expected\": \"\", \"passed\": true}], \"passed\": true}\n"}},"verified":true,"visibility":"public"}