{
  "id": "python/flask-runtimeerror-session-not-available",
  "signature": "RuntimeError: The session is not available for the current request.",
  "signature_zh": "RuntimeError: 当前请求无法使用会话。",
  "regex": "RuntimeError:\\ The\\ session\\ is\\ not\\ available\\ for\\ the\\ current\\ request\\.",
  "domain": "python",
  "category": "runtime_error",
  "subcategory": null,
  "root_cause": "Session is accessed outside of a request context or before it's initialized.",
  "root_cause_type": "generic",
  "root_cause_zh": "在请求上下文之外或初始化之前访问会话。",
  "versions": [
    {
      "version": "3.x",
      "introduced": null,
      "deprecated": null,
      "removed": null,
      "behavior_change": null,
      "status": "active"
    }
  ],
  "os_specific": {},
  "dead_ends": [
    {
      "action": "Setting secret_key after session access",
      "why_fails": "Secret key must be set before first session use.",
      "fail_rate": 0.75,
      "condition": "",
      "sources": []
    },
    {
      "action": "Using flask.session without import",
      "why_fails": "Session object not available without import.",
      "fail_rate": 0.6,
      "condition": "",
      "sources": []
    }
  ],
  "workarounds": [
    {
      "action": "Ensure request context is active",
      "success_rate": 0.9,
      "how": "with app.test_request_context():\n    session['key'] = 'value'\n    print(session['key'])",
      "condition": "",
      "sources": []
    },
    {
      "action": "Initialize session in route",
      "success_rate": 0.95,
      "how": "@app.route('/login')\ndef login():\n    session['user'] = 'Alice'\n    return 'Logged in'",
      "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": "2024-01-08",
  "last_confirmed": "2025-01-01",
  "last_updated": "2025-01-01",
  "evidence_count": 0,
  "tags": [],
  "locale": "en",
  "aliases": []
}