upstream agent_backend {
    server 172.24.16.10:8070  weight=10 max_fails=3 fail_timeout=30s;
    server 172.24.16.7:8070   weight=10 max_fails=3 fail_timeout=30s;
    keepalive 300;
}

server {
    listen 80;
    server_name _;

    access_log /data/tengine/logs/agent_log/agent_access.log;
    error_log /data/tengine/logs/agent_log/agent_error.log;

    location / {
        proxy_pass http://agent_backend;
        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_set_header X-Forwarded-Proto $scheme;

        # 可选：保持长连接
        proxy_http_version 1.1;
        proxy_set_header Connection "";

        # 允许跨域
        add_header 'Access-Control-Allow-Origin' "$http_origin" always;
        add_header 'Access-Control-Allow-Credentials' 'true' always;
        add_header 'Access-Control-Allow-Methods' 'GET, POST, OPTIONS, PUT, DELETE' always;
        add_header 'Access-Control-Allow-Headers' 'Authorization,Content-Type,X-Requested-With,Accept,Origin' always;
        # 处理预检请求
        if ($request_method = OPTIONS ) {
            return 204;
        }
    }
}


机器A的