{
  "id": "go/httptest-server-close-panic",
  "signature": "panic: http: Server closed",
  "signature_zh": "panic: http: 服务器已关闭",
  "regex": "panic:\\ http:\\ Server\\ closed",
  "domain": "go",
  "category": "runtime_error",
  "subcategory": null,
  "root_cause": "调用 httptest.Server.Close() 后，仍有 goroutine 尝试向该服务器发送请求，导致底层连接被关闭，触发 panic。",
  "root_cause_type": "generic",
  "root_cause_zh": "关闭 httptest 测试服务器后，仍有并发请求在途，访问已关闭的监听器引发 panic。",
  "versions": [
    {
      "version": "1.21",
      "introduced": null,
      "deprecated": null,
      "removed": null,
      "behavior_change": null,
      "status": "active"
    }
  ],
  "os_specific": {},
  "dead_ends": [
    {
      "action": "",
      "why_fails": "httptest.Server 关闭后不可复用，连接池中的连接已失效，重试只会导致相同 panic",
      "fail_rate": 0.9,
      "condition": "",
      "sources": []
    },
    {
      "action": "",
      "why_fails": "defer 在函数结束时才执行，但未等待所有 goroutine 结束，仍可能触发 panic",
      "fail_rate": 0.75,
      "condition": "",
      "sources": []
    },
    {
      "action": "",
      "why_fails": "panic 是致命的，捕获后程序状态可能不一致，且掩盖了真正的并发问题",
      "fail_rate": 0.6,
      "condition": "",
      "sources": []
    }
  ],
  "workarounds": [
    {
      "action": "",
      "success_rate": 0.95,
      "how": "使用 sync.WaitGroup 确保所有请求完成后关闭服务器",
      "condition": "",
      "sources": []
    },
    {
      "action": "",
      "success_rate": 0.85,
      "how": "设置 server.Config.ReadTimeout 和 WriteTimeout，避免请求无限期挂起",
      "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": 0.85,
  "fix_success_rate": 0.8,
  "resolvable": "true",
  "first_seen": "2024-03-15",
  "last_confirmed": "2025-01-01",
  "last_updated": "2025-01-01",
  "evidence_count": 0,
  "tags": [],
  "locale": "en",
  "aliases": []
}