{"abstract":"Route rewrite removes only the matched leading prefix.","category":"Network routing","checks":4,"contract":"Bounded offline decision model: route rewrite removes only the matched leading prefix. Inputs are already validated protocol fields; the explicit fixtures define the supported policy, not a complete protocol implementation.","contract_signature":"path, prefix","evaluation_group":"xh-route-rewrite-removes-only-the-matched-leading-prefix","failed_approach":"The attempted repair uses `path.strip(prefix) or \"/\"` and still violates a separate fixture.","family":"xh-route-rewrite-removes-only-the-matched-leading-prefix","id":"FA-7156","implementations":{"attempt":{"sha256":"7002b55eadd89d258532ad44cffb10420ab57a76ddf1ea71857b4ce6beaa8e89","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(path, prefix):\n    return path.strip(prefix) or \"/\"\ndef check(label, actual, expected):\n    observations.append({\"check\": label, \"actual\": actual, \"expected\": expected, \"passed\": actual == expected})\n_fixtures = [\"check('fixture 1', solve('/api/x/api', '/api'), '/x/api')\", \"check('fixture 2', solve('/api', '/api'), '/')\", \"check('fixture 3', solve('/api/a', '/api'), '/a')\", \"check('fixture 4', solve('/api/', '/api'), '/')\"]\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":"528c630f44794366f2eb73cfd32d662ac2868e40bb2902bbed366a5bcbb65496","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(path, prefix):\n    return path.replace(prefix,\"\") or \"/\"\ndef check(label, actual, expected):\n    observations.append({\"check\": label, \"actual\": actual, \"expected\": expected, \"passed\": actual == expected})\n_fixtures = [\"check('fixture 1', solve('/api/x/api', '/api'), '/x/api')\", \"check('fixture 2', solve('/api', '/api'), '/')\", \"check('fixture 3', solve('/api/a', '/api'), '/a')\", \"check('fixture 4', solve('/api/', '/api'), '/')\"]\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-route-rewrite-removes-only-the-matched-leading-prefix","generated_at":"2026-09-29T14:38:08.911201+00:00","license":"CC0-1.0","python":"3.12.14","seed":1,"split":"open-access"},"relevance":"This deterministic network routing model isolates the route-rewrite-removes-only-the-matched-leading-prefix policy at a network component boundary.","root_cause":"The faulty implementation uses `path.replace(prefix,\"\") or \"/\"` for the route-rewrite-removes-only-the-matched-leading-prefix decision.","sha256":"0b29d3093516507636ce9ae733617f6bf337e34bfec067c938c9c6d33c54dc49","title":"Route rewrite removes only the matched leading prefix · 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":43.157,"exit_code":1,"observations":[{"actual":"/","check":"fixture 2","expected":"/","passed":true},{"actual":"/","check":"fixture 3","expected":"/a","passed":false},{"actual":"/","check":"fixture 4","expected":"/","passed":true},{"actual":"x","check":"fixture 1","expected":"/x/api","passed":false}],"passed":false,"stderr":"","stdout":"{\"observations\": [{\"check\": \"fixture 2\", \"actual\": \"/\", \"expected\": \"/\", \"passed\": true}, {\"check\": \"fixture 3\", \"actual\": \"/\", \"expected\": \"/a\", \"passed\": false}, {\"check\": \"fixture 4\", \"actual\": \"/\", \"expected\": \"/\", \"passed\": true}, {\"check\": \"fixture 1\", \"actual\": \"x\", \"expected\": \"/x/api\", \"passed\": false}], \"passed\": false}\n"},"broken":{"elapsed_ms":42.666,"exit_code":1,"observations":[{"actual":"/","check":"fixture 2","expected":"/","passed":true},{"actual":"/a","check":"fixture 3","expected":"/a","passed":true},{"actual":"/","check":"fixture 4","expected":"/","passed":true},{"actual":"/x","check":"fixture 1","expected":"/x/api","passed":false}],"passed":false,"stderr":"","stdout":"{\"observations\": [{\"check\": \"fixture 2\", \"actual\": \"/\", \"expected\": \"/\", \"passed\": true}, {\"check\": \"fixture 3\", \"actual\": \"/a\", \"expected\": \"/a\", \"passed\": true}, {\"check\": \"fixture 4\", \"actual\": \"/\", \"expected\": \"/\", \"passed\": true}, {\"check\": \"fixture 1\", \"actual\": \"/x\", \"expected\": \"/x/api\", \"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."}}