4xx · Client Error
499Client Closed Request (Nginx)
Nginx：客户端在服务器处理请求之前关闭了连接。
What is HTTP 499?
499 Client Closed Request 是 Nginx 的自定义状态码，表示客户端在服务器完成处理请求之前关闭了连接。常见于用户刷新页面或取消请求。
Example
User refreshes page before response → Nginx logs 499Check a URL in real-time
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