{
  "id": "nextjs/headers-must-be-accessed-before-any-other-request-processing",
  "signature": "Error: headers() must be accessed before any other request processing in middleware",
  "signature_zh": "错误：headers() 必须在中间件中任何其他请求处理之前访问",
  "regex": "Error: headers\\(\\) must be accessed before any other request processing",
  "domain": "nextjs",
  "category": "runtime_error",
  "subcategory": null,
  "root_cause": "In Next.js middleware, the headers() function is called after other request processing, causing a race condition where the request context is no longer available.",
  "root_cause_type": "generic",
  "root_cause_zh": "在 Next.js 中间件中，headers() 函数在其他请求处理之后调用，导致请求上下文不再可用的竞态条件。",
  "versions": [
    {
      "version": "next@14.2.0",
      "introduced": null,
      "deprecated": null,
      "removed": null,
      "behavior_change": null,
      "status": "active"
    },
    {
      "version": "next@14.2.5",
      "introduced": null,
      "deprecated": null,
      "removed": null,
      "behavior_change": null,
      "status": "active"
    },
    {
      "version": "next@15.0.0-rc.1",
      "introduced": null,
      "deprecated": null,
      "removed": null,
      "behavior_change": null,
      "status": "active"
    }
  ],
  "os_specific": {},
  "dead_ends": [
    {
      "action": "",
      "why_fails": "This does not fix the root cause; the error still occurs but is silenced, leading to undefined headers.",
      "fail_rate": 0.7,
      "condition": "",
      "sources": []
    },
    {
      "action": "",
      "why_fails": "headers() must be synchronous and called immediately; async wrappers lose the request context.",
      "fail_rate": 0.85,
      "condition": "",
      "sources": []
    },
    {
      "action": "",
      "why_fails": "This is a syntax error, not a timing issue; it doesn't address the race condition.",
      "fail_rate": 0.9,
      "condition": "",
      "sources": []
    }
  ],
  "workarounds": [
    {
      "action": "Call headers() at the very beginning of the middleware function before any other async operations or conditionals.",
      "success_rate": 0.85,
      "how": "Call headers() at the very beginning of the middleware function before any other async operations or conditionals.",
      "condition": "",
      "sources": []
    },
    {
      "action": "If using multiple middleware functions, ensure headers() is only called in the first middleware and pass the result via request headers or locals.",
      "success_rate": 0.75,
      "how": "If using multiple middleware functions, ensure headers() is only called in the first middleware and pass the result via request headers or locals.",
      "condition": "",
      "sources": []
    },
    {
      "action": "Upgrade to Next.js 15 where the middleware API has been updated to handle headers() more robustly.",
      "success_rate": 0.9,
      "how": "Upgrade to Next.js 15 where the middleware API has been updated to handle headers() more robustly.",
      "condition": "",
      "sources": []
    }
  ],
  "workarounds_zh": [
    "在中间件函数的开头，在任何其他异步操作或条件语句之前调用 headers()。",
    "如果使用多个中间件函数，确保只在第一个中间件中调用 headers()，并通过请求头或本地变量传递结果。",
    "升级到 Next.js 15，其中中间件 API 已更新以更稳健地处理 headers()。"
  ],
  "transition_graph": {
    "leads_to": [],
    "preceded_by": [],
    "frequently_confused_with": []
  },
  "official_doc_url": "https://nextjs.org/docs/messages/headers-must-be-accessed-before-any-other-request-processing",
  "official_doc_section": null,
  "error_code": null,
  "verification_tier": "ai_generated",
  "confidence": 0.85,
  "fix_success_rate": 0.78,
  "resolvable": "true",
  "first_seen": "2024-06-15",
  "last_confirmed": "2024-06-01",
  "last_updated": "2024-06-01",
  "evidence_count": 1,
  "tags": [],
  "locale": "en",
  "aliases": []
}