{"abstract":"Bytes after the closing delimiter do not enter the last range body.","category":"HTTP ranges","checks":6,"contract":"Return payload unchanged after close; before close, received bytes extend the still-open payload.","evaluation_group":"s3-http_ranges-multipart-client","failed_approach":"The partial repair uses return payload, which still violates the stated contract.","family":"s3-http_ranges-multipart-client-epilogue-not-payload","id":"FA-26826","implementations":{"attempt":{"sha256":"d3e7658b8a98cbacc0d147ad07b94169d98f925b56437db15205e2d169eccc2c","source":"\"\"\"Failure Map reference implementation. Python standard library only.\"\"\"\nimport json\n\nN = 1\nobservations = []\ndef solve(payload, epilogue, closed):\n    return payload\ndef check(label, actual, expected):\n    observations.append({\"check\": label, \"actual\": actual, \"expected\": expected, \"passed\": actual == expected})\ncheck('multipart-client-epilogue-not-payload fixture 0', solve(\"p\"*N,\"epilogue\",True), \"p\"*N)\ncheck('multipart-client-epilogue-not-payload fixture 1', solve(\"p\",\"q\",False), \"pq\")\ncheck('multipart-client-epilogue-not-payload fixture 2', solve(\"\",\"e\",True), \"\")\ncheck('multipart-client-epilogue-not-payload fixture 3', solve(\"p\",\"\",True), \"p\")\ncheck('multipart-client-epilogue-not-payload fixture 4', solve(\"\",\"x\",False), \"x\")\ncheck('multipart-client-epilogue-not-payload fixture 5', solve(\"\",\"\",False), \"\")\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":"9106f443b2ca7bc7892b00af50256120e95f90291a83e606695ab491ea29ac87","source":"\"\"\"Failure Map reference implementation. Python standard library only.\"\"\"\nimport json\n\nN = 1\nobservations = []\ndef solve(payload, epilogue, closed):\n    return payload+epilogue\ndef check(label, actual, expected):\n    observations.append({\"check\": label, \"actual\": actual, \"expected\": expected, \"passed\": actual == expected})\ncheck('multipart-client-epilogue-not-payload fixture 0', solve(\"p\"*N,\"epilogue\",True), \"p\"*N)\ncheck('multipart-client-epilogue-not-payload fixture 1', solve(\"p\",\"q\",False), \"pq\")\ncheck('multipart-client-epilogue-not-payload fixture 2', solve(\"\",\"e\",True), \"\")\ncheck('multipart-client-epilogue-not-payload fixture 3', solve(\"p\",\"\",True), \"p\")\ncheck('multipart-client-epilogue-not-payload fixture 4', solve(\"\",\"x\",False), \"x\")\ncheck('multipart-client-epilogue-not-payload fixture 5', solve(\"\",\"\",False), \"\")\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":"39e3561c7650c4b6a2c6c2451a3470983e4b8a966024460778761aaf3e877af2","source":"\"\"\"Failure Map reference implementation. Python standard library only.\"\"\"\nimport json\n\nN = 1\nobservations = []\ndef solve(payload, epilogue, closed):\n    return payload if closed else payload+epilogue\ndef check(label, actual, expected):\n    observations.append({\"check\": label, \"actual\": actual, \"expected\": expected, \"passed\": actual == expected})\ncheck('multipart-client-epilogue-not-payload fixture 0', solve(\"p\"*N,\"epilogue\",True), \"p\"*N)\ncheck('multipart-client-epilogue-not-payload fixture 1', solve(\"p\",\"q\",False), \"pq\")\ncheck('multipart-client-epilogue-not-payload fixture 2', solve(\"\",\"e\",True), \"\")\ncheck('multipart-client-epilogue-not-payload fixture 3', solve(\"p\",\"\",True), \"p\")\ncheck('multipart-client-epilogue-not-payload fixture 4', solve(\"\",\"x\",False), \"x\")\ncheck('multipart-client-epilogue-not-payload fixture 5', solve(\"\",\"\",False), \"\")\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-client-epilogue-not-payload","generated_at":"2026-09-29T14:41:19.404586+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 payload if closed else payload+epilogue","root_cause":"The multipart-client-epilogue-not-payload decision uses return payload+epilogue.","sha256":"c6469b40280c27fbe74e15b078010c93af414c373dee828102ae70d28876925b","title":"Bytes after the closing delimiter do not enter the last range body · case 01","variant":1,"variant_policy":"Five numbered records share a model and may reuse boundary fixtures.","verification":{"attempt":{"elapsed_ms":37.501,"exit_code":1,"observations":[{"actual":"p","check":"multipart-client-epilogue-not-payload fixture 0","expected":"p","passed":true},{"actual":"p","check":"multipart-client-epilogue-not-payload fixture 1","expected":"pq","passed":false},{"actual":"","check":"multipart-client-epilogue-not-payload fixture 2","expected":"","passed":true},{"actual":"p","check":"multipart-client-epilogue-not-payload fixture 3","expected":"p","passed":true},{"actual":"","check":"multipart-client-epilogue-not-payload fixture 4","expected":"x","passed":false},{"actual":"","check":"multipart-client-epilogue-not-payload fixture 5","expected":"","passed":true}],"passed":false,"stderr":"","stdout":"{\"observations\": [{\"check\": \"multipart-client-epilogue-not-payload fixture 0\", \"actual\": \"p\", \"expected\": \"p\", \"passed\": true}, {\"check\": \"multipart-client-epilogue-not-payload fixture 1\", \"actual\": \"p\", \"expected\": \"pq\", \"passed\": false}, {\"check\": \"multipart-client-epilogue-not-payload fixture 2\", \"actual\": \"\", \"expected\": \"\", \"passed\": true}, {\"check\": \"multipart-client-epilogue-not-payload fixture 3\", \"actual\": \"p\", \"expected\": \"p\", \"passed\": true}, {\"check\": \"multipart-client-epilogue-not-payload fixture 4\", \"actual\": \"\", \"expected\": \"x\", \"passed\": false}, {\"check\": \"multipart-client-epilogue-not-payload fixture 5\", \"actual\": \"\", \"expected\": \"\", \"passed\": true}], \"passed\": false}\n"},"broken":{"elapsed_ms":38.054,"exit_code":1,"observations":[{"actual":"pepilogue","check":"multipart-client-epilogue-not-payload fixture 0","expected":"p","passed":false},{"actual":"pq","check":"multipart-client-epilogue-not-payload fixture 1","expected":"pq","passed":true},{"actual":"e","check":"multipart-client-epilogue-not-payload fixture 2","expected":"","passed":false},{"actual":"p","check":"multipart-client-epilogue-not-payload fixture 3","expected":"p","passed":true},{"actual":"x","check":"multipart-client-epilogue-not-payload fixture 4","expected":"x","passed":true},{"actual":"","check":"multipart-client-epilogue-not-payload fixture 5","expected":"","passed":true}],"passed":false,"stderr":"","stdout":"{\"observations\": [{\"check\": \"multipart-client-epilogue-not-payload fixture 0\", \"actual\": \"pepilogue\", \"expected\": \"p\", \"passed\": false}, {\"check\": \"multipart-client-epilogue-not-payload fixture 1\", \"actual\": \"pq\", \"expected\": \"pq\", \"passed\": true}, {\"check\": \"multipart-client-epilogue-not-payload fixture 2\", \"actual\": \"e\", \"expected\": \"\", \"passed\": false}, {\"check\": \"multipart-client-epilogue-not-payload fixture 3\", \"actual\": \"p\", \"expected\": \"p\", \"passed\": true}, {\"check\": \"multipart-client-epilogue-not-payload fixture 4\", \"actual\": \"x\", \"expected\": \"x\", \"passed\": true}, {\"check\": \"multipart-client-epilogue-not-payload fixture 5\", \"actual\": \"\", \"expected\": \"\", \"passed\": true}], \"passed\": false}\n"},"fixed":{"elapsed_ms":39.055,"exit_code":0,"observations":[{"actual":"p","check":"multipart-client-epilogue-not-payload fixture 0","expected":"p","passed":true},{"actual":"pq","check":"multipart-client-epilogue-not-payload fixture 1","expected":"pq","passed":true},{"actual":"","check":"multipart-client-epilogue-not-payload fixture 2","expected":"","passed":true},{"actual":"p","check":"multipart-client-epilogue-not-payload fixture 3","expected":"p","passed":true},{"actual":"x","check":"multipart-client-epilogue-not-payload fixture 4","expected":"x","passed":true},{"actual":"","check":"multipart-client-epilogue-not-payload fixture 5","expected":"","passed":true}],"passed":true,"stderr":"","stdout":"{\"observations\": [{\"check\": \"multipart-client-epilogue-not-payload fixture 0\", \"actual\": \"p\", \"expected\": \"p\", \"passed\": true}, {\"check\": \"multipart-client-epilogue-not-payload fixture 1\", \"actual\": \"pq\", \"expected\": \"pq\", \"passed\": true}, {\"check\": \"multipart-client-epilogue-not-payload fixture 2\", \"actual\": \"\", \"expected\": \"\", \"passed\": true}, {\"check\": \"multipart-client-epilogue-not-payload fixture 3\", \"actual\": \"p\", \"expected\": \"p\", \"passed\": true}, {\"check\": \"multipart-client-epilogue-not-payload fixture 4\", \"actual\": \"x\", \"expected\": \"x\", \"passed\": true}, {\"check\": \"multipart-client-epilogue-not-payload fixture 5\", \"actual\": \"\", \"expected\": \"\", \"passed\": true}], \"passed\": true}\n"}},"verified":true,"visibility":"public"}