{
  "id": "python/fastapi-cors-middleware-config",
  "signature": "AssertionError: 'allow_origins' must be a list or tuple",
  "signature_zh": "断言错误：'allow_origins' 必须是列表或元组",
  "regex": "AssertionError:\\ 'allow_origins'\\ must\\ be\\ a\\ list\\ or\\ tuple",
  "domain": "python",
  "category": "config_error",
  "subcategory": null,
  "root_cause": "CORS 中间件的 allow_origins 参数类型错误，例如传入了字符串。",
  "root_cause_type": "generic",
  "root_cause_zh": "CORS 中间件的 allow_origins 参数类型错误，例如传入了字符串。",
  "versions": [
    {
      "version": "3.x",
      "introduced": null,
      "deprecated": null,
      "removed": null,
      "behavior_change": null,
      "status": "active"
    }
  ],
  "os_specific": {},
  "dead_ends": [
    {
      "action": "",
      "why_fails": "仍然是一个字符串，不是列表",
      "fail_rate": 0.8,
      "condition": "",
      "sources": []
    },
    {
      "action": "",
      "why_fails": "可能过于宽松，导致安全问题",
      "fail_rate": 0.5,
      "condition": "",
      "sources": []
    }
  ],
  "workarounds": [
    {
      "action": "",
      "success_rate": 1.0,
      "how": "app.add_middleware(CORSMiddleware, allow_origins=['*'], allow_methods=['*'])\n# 或 allow_origins=[\"http://localhost:3000\"]",
      "condition": "",
      "sources": []
    }
  ],
  "workarounds_zh": [],
  "transition_graph": {
    "leads_to": [],
    "preceded_by": [],
    "frequently_confused_with": []
  },
  "official_doc_url": null,
  "official_doc_section": null,
  "error_code": null,
  "verification_tier": "ai_generated",
  "confidence": 0.84,
  "fix_success_rate": 0.8,
  "resolvable": "true",
  "first_seen": "2024-11-02",
  "last_confirmed": "2025-01-01",
  "last_updated": "2025-01-01",
  "evidence_count": 0,
  "tags": [],
  "locale": "en",
  "aliases": []
}