{
  "id": "python/starlette-middleware-order-error",
  "signature": "AssertionError: Middleware 'CORSMiddleware' must be added before 'SessionMiddleware'",
  "signature_zh": "断言错误：CORSMiddleware 必须在 SessionMiddleware 之前添加",
  "regex": "AssertionError:\\ Middleware\\ 'CORSMiddleware'\\ must\\ be\\ added\\ before\\ 'SessionMiddleware'",
  "domain": "python",
  "category": "config_error",
  "subcategory": null,
  "root_cause": "Starlette 中间件的添加顺序不正确，违反了依赖关系",
  "root_cause_type": "generic",
  "root_cause_zh": "Starlette 中间件的添加顺序不正确，违反了依赖关系",
  "versions": [
    {
      "version": "3.10",
      "introduced": null,
      "deprecated": null,
      "removed": null,
      "behavior_change": null,
      "status": "active"
    },
    {
      "version": "3.11",
      "introduced": null,
      "deprecated": null,
      "removed": null,
      "behavior_change": null,
      "status": "active"
    }
  ],
  "os_specific": {},
  "dead_ends": [
    {
      "action": "删除 SessionMiddleware 并单独使用 CORS",
      "why_fails": "会话功能丢失",
      "fail_rate": 0.6,
      "condition": "",
      "sources": []
    },
    {
      "action": "使用装饰器顺序而非 add_middleware",
      "why_fails": "装饰器顺序也可能导致相同问题",
      "fail_rate": 0.8,
      "condition": "",
      "sources": []
    }
  ],
  "workarounds": [
    {
      "action": "按照正确顺序添加中间件",
      "success_rate": 0.95,
      "how": "app.add_middleware(CORSMiddleware, allow_origins=['*'])\napp.add_middleware(SessionMiddleware, secret_key='key')",
      "condition": "",
      "sources": []
    },
    {
      "action": "查阅文档确认中间件依赖顺序",
      "success_rate": 0.9,
      "how": "阅读 Starlette 文档中关于中间件顺序的说明",
      "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": 0.82,
  "fix_success_rate": 0.8,
  "resolvable": "true",
  "first_seen": "2024-12-15",
  "last_confirmed": "2025-01-01",
  "last_updated": "2025-01-01",
  "evidence_count": 0,
  "tags": [],
  "locale": "en",
  "aliases": []
}