{"abstract":"An explicit nonmatching entity condition takes precedence over a matching date.","category":"HTTP ranges","checks":6,"contract":"For this GET model use tag_hit whenever a tag condition was present, otherwise date_hit. Return [304,empty] or [206,part].","contract_signature":"tags_present, tag_hit, date_hit, part","evaluation_group":"s3-http_ranges-conditional","failed_approach":"The partial repair uses return [304, \"\"] if tag_hit else [206,part], which still violates the stated contract.","family":"s3-http_ranges-if-none-match-suppresses-date","id":"FA-26376","implementations":{"attempt":{"sha256":"34889cf0239e466091775274ad6624582f17b9816e9f6e5be14b12a68781b474","source":"\"\"\"Failure Map reference implementation. Python standard library only.\"\"\"\nimport json\n\nN = 1\nobservations = []\ndef solve(tags_present, tag_hit, date_hit, part):\n    return [304, \"\"] if tag_hit else [206,part]\ndef check(label, actual, expected):\n    observations.append({\"check\": label, \"actual\": actual, \"expected\": expected, \"passed\": actual == expected})\ncheck('if-none-match-suppresses-date fixture 0', solve(True,False,True,\"p\"*N), [206,\"p\"*N])\ncheck('if-none-match-suppresses-date fixture 1', solve(False,False,True,\"p\"), [304,\"\"])\ncheck('if-none-match-suppresses-date fixture 2', solve(True,True,False,\"p\"), [304,\"\"])\ncheck('if-none-match-suppresses-date fixture 3', solve(True,False,False,\"p\"*N), [206,\"p\"*N])\ncheck('if-none-match-suppresses-date fixture 4', solve(False,False,False,\"p\"), [206,\"p\"])\ncheck('if-none-match-suppresses-date fixture 5', solve(False,True,False,\"p\"), [206,\"p\"])\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":"5cd6736c9b030c2e5821ec4ad5075aa40dd49514a65c846551bd58df9ae24cee","source":"\"\"\"Failure Map reference implementation. Python standard library only.\"\"\"\nimport json\n\nN = 1\nobservations = []\ndef solve(tags_present, tag_hit, date_hit, part):\n    return [304, \"\"] if tag_hit or date_hit else [206,part]\ndef check(label, actual, expected):\n    observations.append({\"check\": label, \"actual\": actual, \"expected\": expected, \"passed\": actual == expected})\ncheck('if-none-match-suppresses-date fixture 0', solve(True,False,True,\"p\"*N), [206,\"p\"*N])\ncheck('if-none-match-suppresses-date fixture 1', solve(False,False,True,\"p\"), [304,\"\"])\ncheck('if-none-match-suppresses-date fixture 2', solve(True,True,False,\"p\"), [304,\"\"])\ncheck('if-none-match-suppresses-date fixture 3', solve(True,False,False,\"p\"*N), [206,\"p\"*N])\ncheck('if-none-match-suppresses-date fixture 4', solve(False,False,False,\"p\"), [206,\"p\"])\ncheck('if-none-match-suppresses-date fixture 5', solve(False,True,False,\"p\"), [206,\"p\"])\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-if-none-match-suppresses-date","generated_at":"2026-09-29T14:41:15.494558+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 if-none-match-suppresses-date decision uses return [304, \"\"] if tag_hit or date_hit else [206,part].","sha256":"97a9ca6996147dca2dc9a98799d623cc0e152f80be32d99be576491e746098d7","title":"An explicit nonmatching entity condition takes precedence over a matching date · 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":38.937,"exit_code":1,"observations":[{"actual":[206,"p"],"check":"if-none-match-suppresses-date fixture 0","expected":[206,"p"],"passed":true},{"actual":[206,"p"],"check":"if-none-match-suppresses-date fixture 1","expected":[304,""],"passed":false},{"actual":[304,""],"check":"if-none-match-suppresses-date fixture 2","expected":[304,""],"passed":true},{"actual":[206,"p"],"check":"if-none-match-suppresses-date fixture 3","expected":[206,"p"],"passed":true},{"actual":[206,"p"],"check":"if-none-match-suppresses-date fixture 4","expected":[206,"p"],"passed":true},{"actual":[304,""],"check":"if-none-match-suppresses-date fixture 5","expected":[206,"p"],"passed":false}],"passed":false,"stderr":"","stdout":"{\"observations\": [{\"check\": \"if-none-match-suppresses-date fixture 0\", \"actual\": [206, \"p\"], \"expected\": [206, \"p\"], \"passed\": true}, {\"check\": \"if-none-match-suppresses-date fixture 1\", \"actual\": [206, \"p\"], \"expected\": [304, \"\"], \"passed\": false}, {\"check\": \"if-none-match-suppresses-date fixture 2\", \"actual\": [304, \"\"], \"expected\": [304, \"\"], \"passed\": true}, {\"check\": \"if-none-match-suppresses-date fixture 3\", \"actual\": [206, \"p\"], \"expected\": [206, \"p\"], \"passed\": true}, {\"check\": \"if-none-match-suppresses-date fixture 4\", \"actual\": [206, \"p\"], \"expected\": [206, \"p\"], \"passed\": true}, {\"check\": \"if-none-match-suppresses-date fixture 5\", \"actual\": [304, \"\"], \"expected\": [206, \"p\"], \"passed\": false}], \"passed\": false}\n"},"broken":{"elapsed_ms":42.717,"exit_code":1,"observations":[{"actual":[304,""],"check":"if-none-match-suppresses-date fixture 0","expected":[206,"p"],"passed":false},{"actual":[304,""],"check":"if-none-match-suppresses-date fixture 1","expected":[304,""],"passed":true},{"actual":[304,""],"check":"if-none-match-suppresses-date fixture 2","expected":[304,""],"passed":true},{"actual":[206,"p"],"check":"if-none-match-suppresses-date fixture 3","expected":[206,"p"],"passed":true},{"actual":[206,"p"],"check":"if-none-match-suppresses-date fixture 4","expected":[206,"p"],"passed":true},{"actual":[304,""],"check":"if-none-match-suppresses-date fixture 5","expected":[206,"p"],"passed":false}],"passed":false,"stderr":"","stdout":"{\"observations\": [{\"check\": \"if-none-match-suppresses-date fixture 0\", \"actual\": [304, \"\"], \"expected\": [206, \"p\"], \"passed\": false}, {\"check\": \"if-none-match-suppresses-date fixture 1\", \"actual\": [304, \"\"], \"expected\": [304, \"\"], \"passed\": true}, {\"check\": \"if-none-match-suppresses-date fixture 2\", \"actual\": [304, \"\"], \"expected\": [304, \"\"], \"passed\": true}, {\"check\": \"if-none-match-suppresses-date fixture 3\", \"actual\": [206, \"p\"], \"expected\": [206, \"p\"], \"passed\": true}, {\"check\": \"if-none-match-suppresses-date fixture 4\", \"actual\": [206, \"p\"], \"expected\": [206, \"p\"], \"passed\": true}, {\"check\": \"if-none-match-suppresses-date fixture 5\", \"actual\": [304, \"\"], \"expected\": [206, \"p\"], \"passed\": false}], \"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."}}