{"abstract":"Http2 data credit is constrained by stream and connection.","category":"Multiplexed protocols","checks":4,"contract":"Bounded offline decision model: http2 data credit is constrained by stream and connection. Inputs are already validated protocol fields; the explicit fixtures define the supported policy, not a complete protocol implementation.","contract_signature":"stream_credit, connection_credit, wanted","evaluation_group":"xh-http2-data-credit-is-constrained-by-stream-and-connection","failed_approach":"The attempted repair uses `max(0,min(connection_credit,wanted))` and still violates a separate fixture.","family":"xh-http2-data-credit-is-constrained-by-stream-and-connection","id":"FA-7476","implementations":{"attempt":{"sha256":"12116e106777820dae3b0e0493c19fac3ab62d193cbef2ca07c5067627312c2b","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(stream_credit, connection_credit, wanted):\n    return max(0,min(connection_credit,wanted))\ndef check(label, actual, expected):\n    observations.append({\"check\": label, \"actual\": actual, \"expected\": expected, \"passed\": actual == expected})\n_fixtures = [\"check('fixture 1', solve(10, 3, 8), 3)\", \"check('fixture 2', solve(3, 10, 8), 3)\", \"check('fixture 3', solve(-2, 10, 8), 0)\", \"check('fixture 4', solve(10, 10, 8), 8)\"]\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":"619f8825ef6d97c63b25727cb134a58ccfa8b355ed7468f53c62092f0e03c1be","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(stream_credit, connection_credit, wanted):\n    return max(0,min(stream_credit,wanted))\ndef check(label, actual, expected):\n    observations.append({\"check\": label, \"actual\": actual, \"expected\": expected, \"passed\": actual == expected})\n_fixtures = [\"check('fixture 1', solve(10, 3, 8), 3)\", \"check('fixture 2', solve(3, 10, 8), 3)\", \"check('fixture 3', solve(-2, 10, 8), 0)\", \"check('fixture 4', solve(10, 10, 8), 8)\"]\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-http2-data-credit-is-constrained-by-stream-and-connection","generated_at":"2026-09-29T14:38:12.408949+00:00","license":"CC0-1.0","python":"3.12.14","seed":1,"split":"open-access"},"relevance":"This deterministic multiplexed protocols model isolates the http2-data-credit-is-constrained-by-stream-and-connection policy at a network component boundary.","root_cause":"The faulty implementation uses `max(0,min(stream_credit,wanted))` for the http2-data-credit-is-constrained-by-stream-and-connection decision.","sha256":"fb21a59092f868964c5fcebb6d00ddbd46b435e9e69c15f730fa39fc25b09e74","title":"Http2 data credit is constrained by stream and connection · 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":44.254,"exit_code":1,"observations":[{"actual":8,"check":"fixture 2","expected":3,"passed":false},{"actual":8,"check":"fixture 3","expected":0,"passed":false},{"actual":8,"check":"fixture 4","expected":8,"passed":true},{"actual":3,"check":"fixture 1","expected":3,"passed":true}],"passed":false,"stderr":"","stdout":"{\"observations\": [{\"check\": \"fixture 2\", \"actual\": 8, \"expected\": 3, \"passed\": false}, {\"check\": \"fixture 3\", \"actual\": 8, \"expected\": 0, \"passed\": false}, {\"check\": \"fixture 4\", \"actual\": 8, \"expected\": 8, \"passed\": true}, {\"check\": \"fixture 1\", \"actual\": 3, \"expected\": 3, \"passed\": true}], \"passed\": false}\n"},"broken":{"elapsed_ms":46.755,"exit_code":1,"observations":[{"actual":3,"check":"fixture 2","expected":3,"passed":true},{"actual":0,"check":"fixture 3","expected":0,"passed":true},{"actual":8,"check":"fixture 4","expected":8,"passed":true},{"actual":8,"check":"fixture 1","expected":3,"passed":false}],"passed":false,"stderr":"","stdout":"{\"observations\": [{\"check\": \"fixture 2\", \"actual\": 3, \"expected\": 3, \"passed\": true}, {\"check\": \"fixture 3\", \"actual\": 0, \"expected\": 0, \"passed\": true}, {\"check\": \"fixture 4\", \"actual\": 8, \"expected\": 8, \"passed\": true}, {\"check\": \"fixture 1\", \"actual\": 8, \"expected\": 3, \"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."}}