{"abstract":"Part payloads always precede a framing CRLF.","category":"HTTP ranges","checks":6,"contract":"Append one CRLF framing separator regardless of whether payload already ends in CRLF. The payload itself must remain intact.","contract_signature":"body","evaluation_group":"s3-http_ranges-multipart","failed_approach":"The partial repair uses return body.rstrip(\"\\r\\n\")+\"\\r\\n\", which still violates the stated contract.","family":"s3-http_ranges-multipart-payload-separator","id":"FA-26451","implementations":{"attempt":{"sha256":"aa31114512d1519671f34b12c3b1b4a13b155df3e0aefe96e01b034696ccdab6","source":"\"\"\"Failure Map reference implementation. Python standard library only.\"\"\"\nimport json\n\nN = 1\nobservations = []\ndef solve(body):\n    return body.rstrip(\"\\r\\n\")+\"\\r\\n\"\ndef check(label, actual, expected):\n    observations.append({\"check\": label, \"actual\": actual, \"expected\": expected, \"passed\": actual == expected})\ncheck('multipart-payload-separator fixture 0', solve(\"x\"*N+\"\\r\\n\"), \"x\"*N+\"\\r\\n\\r\\n\")\ncheck('multipart-payload-separator fixture 1', solve(\"\"), \"\\r\\n\")\ncheck('multipart-payload-separator fixture 2', solve(\"x\"*N), \"x\"*N+\"\\r\\n\")\ncheck('multipart-payload-separator fixture 3', solve(\"\\r\\n\\r\\n\"), \"\\r\\n\\r\\n\\r\\n\")\ncheck('multipart-payload-separator fixture 4', solve(\"x\\r\"), \"x\\r\\r\\n\")\ncheck('multipart-payload-separator fixture 5', solve(\"x\\n\"), \"x\\n\\r\\n\")\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":"98a63c65ee65487ea9dd6fa003d2e677283ee7a06d516b4979a8d6aebaf67f57","source":"\"\"\"Failure Map reference implementation. Python standard library only.\"\"\"\nimport json\n\nN = 1\nobservations = []\ndef solve(body):\n    return body if body.endswith(\"\\r\\n\") else body+\"\\r\\n\"\ndef check(label, actual, expected):\n    observations.append({\"check\": label, \"actual\": actual, \"expected\": expected, \"passed\": actual == expected})\ncheck('multipart-payload-separator fixture 0', solve(\"x\"*N+\"\\r\\n\"), \"x\"*N+\"\\r\\n\\r\\n\")\ncheck('multipart-payload-separator fixture 1', solve(\"\"), \"\\r\\n\")\ncheck('multipart-payload-separator fixture 2', solve(\"x\"*N), \"x\"*N+\"\\r\\n\")\ncheck('multipart-payload-separator fixture 3', solve(\"\\r\\n\\r\\n\"), \"\\r\\n\\r\\n\\r\\n\")\ncheck('multipart-payload-separator fixture 4', solve(\"x\\r\"), \"x\\r\\r\\n\")\ncheck('multipart-payload-separator fixture 5', solve(\"x\\n\"), \"x\\n\\r\\n\")\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-multipart-payload-separator","generated_at":"2026-09-29T14:41:16.210764+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.","root_cause":"The multipart-payload-separator decision uses return body if body.endswith(\"\\r\\n\") else body+\"\\r\\n\".","sha256":"87588448e927f731d3bd929e4aabff9b363eede880316d3173abaeae7ea3861d","title":"Part payloads always precede a framing CRLF · 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":38.395,"exit_code":1,"observations":[{"actual":"x\r\n","check":"multipart-payload-separator fixture 0","expected":"x\r\n\r\n","passed":false},{"actual":"\r\n","check":"multipart-payload-separator fixture 1","expected":"\r\n","passed":true},{"actual":"x\r\n","check":"multipart-payload-separator fixture 2","expected":"x\r\n","passed":true},{"actual":"\r\n","check":"multipart-payload-separator fixture 3","expected":"\r\n\r\n\r\n","passed":false},{"actual":"x\r\n","check":"multipart-payload-separator fixture 4","expected":"x\r\r\n","passed":false},{"actual":"x\r\n","check":"multipart-payload-separator fixture 5","expected":"x\n\r\n","passed":false}],"passed":false,"stderr":"","stdout":"{\"observations\": [{\"check\": \"multipart-payload-separator fixture 0\", \"actual\": \"x\\r\\n\", \"expected\": \"x\\r\\n\\r\\n\", \"passed\": false}, {\"check\": \"multipart-payload-separator fixture 1\", \"actual\": \"\\r\\n\", \"expected\": \"\\r\\n\", \"passed\": true}, {\"check\": \"multipart-payload-separator fixture 2\", \"actual\": \"x\\r\\n\", \"expected\": \"x\\r\\n\", \"passed\": true}, {\"check\": \"multipart-payload-separator fixture 3\", \"actual\": \"\\r\\n\", \"expected\": \"\\r\\n\\r\\n\\r\\n\", \"passed\": false}, {\"check\": \"multipart-payload-separator fixture 4\", \"actual\": \"x\\r\\n\", \"expected\": \"x\\r\\r\\n\", \"passed\": false}, {\"check\": \"multipart-payload-separator fixture 5\", \"actual\": \"x\\r\\n\", \"expected\": \"x\\n\\r\\n\", \"passed\": false}], \"passed\": false}\n"},"broken":{"elapsed_ms":40.307,"exit_code":1,"observations":[{"actual":"x\r\n","check":"multipart-payload-separator fixture 0","expected":"x\r\n\r\n","passed":false},{"actual":"\r\n","check":"multipart-payload-separator fixture 1","expected":"\r\n","passed":true},{"actual":"x\r\n","check":"multipart-payload-separator fixture 2","expected":"x\r\n","passed":true},{"actual":"\r\n\r\n","check":"multipart-payload-separator fixture 3","expected":"\r\n\r\n\r\n","passed":false},{"actual":"x\r\r\n","check":"multipart-payload-separator fixture 4","expected":"x\r\r\n","passed":true},{"actual":"x\n\r\n","check":"multipart-payload-separator fixture 5","expected":"x\n\r\n","passed":true}],"passed":false,"stderr":"","stdout":"{\"observations\": [{\"check\": \"multipart-payload-separator fixture 0\", \"actual\": \"x\\r\\n\", \"expected\": \"x\\r\\n\\r\\n\", \"passed\": false}, {\"check\": \"multipart-payload-separator fixture 1\", \"actual\": \"\\r\\n\", \"expected\": \"\\r\\n\", \"passed\": true}, {\"check\": \"multipart-payload-separator fixture 2\", \"actual\": \"x\\r\\n\", \"expected\": \"x\\r\\n\", \"passed\": true}, {\"check\": \"multipart-payload-separator fixture 3\", \"actual\": \"\\r\\n\\r\\n\", \"expected\": \"\\r\\n\\r\\n\\r\\n\", \"passed\": false}, {\"check\": \"multipart-payload-separator fixture 4\", \"actual\": \"x\\r\\r\\n\", \"expected\": \"x\\r\\r\\n\", \"passed\": true}, {\"check\": \"multipart-payload-separator fixture 5\", \"actual\": \"x\\n\\r\\n\", \"expected\": \"x\\n\\r\\n\", \"passed\": true}], \"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."}}