events {
    worker_connections 1024;
}

http {
    include       /etc/nginx/mime.types;
    default_type  application/octet-stream;

    map $http_upgrade $connection_upgrade {
        default upgrade;
        ''      close;
    }

    # 标记是否为 WebSocket 请求
    map $http_upgrade $is_websocket {
        default 0;
        websocket 1;
    }

    upstream easytier_backend {
        server 127.0.0.1:7880;
        keepalive 64;
    }

    server {
        listen 7860;
        server_name localhost;

        # 方式1：内部代理位置（推荐）
        location /_ws {
            internal;  # 只允许内部重写访问
            proxy_pass http://easytier_backend;
            proxy_http_version 1.1;
            proxy_set_header Upgrade $http_upgrade;
            proxy_set_header Connection $connection_upgrade;
            proxy_set_header Host $host;
            proxy_set_header X-Real-IP $remote_addr;
            proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
            proxy_buffering off;
            proxy_read_timeout 3600s;
            proxy_send_timeout 3600s;
        }

        # 主 location
        location / {
            # WebSocket 请求内部重写到 /_ws
            if ($is_websocket) {
                rewrite ^/(.*)$ /_ws/$1?$args last;
            }
            
            # 普通 HTTP 请求
            root /var/www/html;
            index index.html;
            try_files $uri $uri/ /index.html;
        }
    }
}