{
  "id": "python/fastapi-cors-middleware-error",
  "signature": "TypeError: 'CORSMiddleware' object is not callable",
  "signature_zh": "类型错误: 'CORSMiddleware' 对象不可调用",
  "regex": "TypeError:\\ 'CORSMiddleware'\\ object\\ is\\ not\\ callable",
  "domain": "python",
  "category": "config_error",
  "subcategory": null,
  "root_cause": "FastAPI中CORSMiddleware未正确添加到应用，导致被当作可调用对象处理。",
  "root_cause_type": "generic",
  "root_cause_zh": "FastAPI中CORSMiddleware未正确添加到应用，导致被当作可调用对象处理。",
  "versions": [
    {
      "version": "3.x",
      "introduced": null,
      "deprecated": null,
      "removed": null,
      "behavior_change": null,
      "status": "active"
    }
  ],
  "os_specific": {},
  "dead_ends": [
    {
      "action": "直接导入CORSMiddleware并作为装饰器使用",
      "why_fails": "CORSMiddleware是类，需要实例化。",
      "fail_rate": 0.9,
      "condition": "",
      "sources": []
    },
    {
      "action": "在路由中使用CORSMiddleware作为依赖项",
      "why_fails": "依赖项需要可调用对象。",
      "fail_rate": 0.8,
      "condition": "",
      "sources": []
    }
  ],
  "workarounds": [
    {
      "action": "使用add_middleware正确添加CORS中间件",
      "success_rate": 0.95,
      "how": "from fastapi.middleware.cors import CORSMiddleware; app.add_middleware(CORSMiddleware, allow_origins=['*'], allow_methods=['*'], allow_headers=['*'])",
      "condition": "",
      "sources": []
    },
    {
      "action": "使用Starlette的CORSMiddleware并手动添加",
      "success_rate": 0.9,
      "how": "from starlette.middleware.cors import CORSMiddleware; app.add_middleware(CORSMiddleware, allow_origins=['*'])",
      "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": 0.88,
  "fix_success_rate": 0.8,
  "resolvable": "true",
  "first_seen": "2024-05-20",
  "last_confirmed": "2025-01-01",
  "last_updated": "2025-01-01",
  "evidence_count": 0,
  "tags": [],
  "locale": "en",
  "aliases": []
}