claude-code-router でAPI Error 500が出るときの対処法

事象

claude-code-routerで以下のようなエラーが出る

❯ ccr code
╭───────────────────────────────────────────────────╮
│ ✻ Welcome to Claude Code!                         │
│                                                   │
│   /help for help, /status for your current setup  │
│                                                   │
│   cwd: /home/user1/projects/pcap1     │
│                                                   │
│   ─────────────────────────────────────────────── │
│                                                   │
│   Overrides (via env):                            │
│                                                   │
│   • API timeout: 600000ms                         │
│   • API Base URL: http://127.0.0.1:3456           │
╰───────────────────────────────────────────────────╯

> hi
  ⎿  API Error (500 {"error":{"message":"fetch failedTypeError: fetch failed\n    at node:internal/deps/undici/undici:13502:13\n    at process.processTicksAndRejections (node:internal/process/task_queues:105:5)\n    at async u0 (/home/user1/.nvm/versions/node/v22.14.0/lib/node_modules/@musistudio/claude-code-router/dist/cli.js:74669:11)\n    at async o0 (/home/user1/.nvm/versions/node/v22.14.0/lib/node_modules/@musistudio/claude-code-router/dist/cli.js:74639:84)","type":"api_error","code":"internal_error"}}) · Retrying in 1 seconds… (attempt 1/10)h 

解決法

config.jsonからPROXY_URLを消す

{
  "Providers": [
    {
      "name": "openrouter",
      "api_base_url": "https://openrouter.ai/api/v1/chat/completions",
      "api_key": "api_key",
      "models": ["anthropic/claude-sonnet-4"],
      "transformer": {
        "use": ["openrouter"]
      }
    }
  ],
  "Router": {
    "default": "openrouter,anthropic/claude-sonnet-4"
  },
  "LOG": true
}

そしてサーバーをリスタート

ccr restart

以上です。