{
  "id": "python/starlette-attributeerror-starlette-app-has-no-attribute-add-middleware",
  "signature": "AttributeError: 'Starlette' object has no attribute 'add_middleware'",
  "signature_zh": "属性错误：'Starlette'对象没有属性'add_middleware'",
  "regex": "AttributeError:\\ 'Starlette'\\ object\\ has\\ no\\ attribute\\ 'add_middleware'",
  "domain": "python",
  "category": "type_error",
  "subcategory": null,
  "root_cause": "Trying to use add_middleware method on a Starlette instance, but the method is not available in older versions or incorrect object.",
  "root_cause_type": "generic",
  "root_cause_zh": "尝试在Starlette实例上使用add_middleware方法，但该方法在旧版本中不可用或对象错误。",
  "versions": [
    {
      "version": "3.x",
      "introduced": null,
      "deprecated": null,
      "removed": null,
      "behavior_change": null,
      "status": "active"
    }
  ],
  "os_specific": {},
  "dead_ends": [
    {
      "action": "Assuming Starlette has the same API as Flask",
      "why_fails": "Starlette uses different middleware registration.",
      "fail_rate": 0.7,
      "condition": "",
      "sources": []
    },
    {
      "action": "Using add_middleware on a middleware class instead of app",
      "why_fails": "Method exists on app, not middleware.",
      "fail_rate": 0.8,
      "condition": "",
      "sources": []
    }
  ],
  "workarounds": [
    {
      "action": "Use correct middleware registration syntax",
      "success_rate": 0.9,
      "how": "app.add_middleware(MiddlewareClass)",
      "condition": "",
      "sources": []
    },
    {
      "action": "Check Starlette version and upgrade if needed",
      "success_rate": 0.85,
      "how": "pip install --upgrade starlette",
      "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": "2025-04-05",
  "last_confirmed": "2025-01-01",
  "last_updated": "2025-01-01",
  "evidence_count": 0,
  "tags": [],
  "locale": "en",
  "aliases": []
}