Network
- DNS: getaddrinfo ENOTFOUND
- DNS: NXDOMAIN - Domain not found
- ERR_NETWORK_CHANGED
- Failed to fetch
- Failed to fetch - CORSポリシー違反
- Failed to fetch - Mixed Content
- Failed to fetch - SSL/TLS証明書
- Failed to fetch - ネットワーク・サーバー問題
- Failed to fetch - リクエストキャンセル（Abort）
- Failed to fetch (Node.js)
- HTTP 502: Bad Gateway
- HTTP 503: Service Unavailable
- Network: Connection refused
- Network: Connection timed out
- Nginx: 502 Bad Gateway
- Socket: ECONNRESET - Connection reset by peer
- WebSocket: Close code 1006 (Abnormal Closure)
- WebSocket: Connection failed