最近发现服务器日志 502 状态出现的比 200 还要多，我想可能是我屏蔽了大量蜘蛛和非浏览器访问导致的吧。
然后今天加新节点测试阶段，发现 CDN 服务状态异常，排查发现是防火墙封禁了服务器 IP 和宝塔防火墙非浏览器拦截。
由于我的 IP 一直在防火墙白名单内，所以我一直没发现。
1. 服务器 IP 加入防火墙白名单
2. 宝塔防火墙非浏览器拦截关闭
3. 检查节点服务器与源站服务器 ping 延迟
自建CDN避坑
AI-generated summary
Recently, the server logs have shown more 502 errors than 200, possibly due to blocking a large number of spiders and non-browser accesses. During the testing phase of adding a new node today, the CDN service was found to be in an abnormal state. It was discovered that the firewall had blocked the server IP and the non-browser interception of the Baota firewall. Since my IP has always been on the firewall whitelist, I didn't notice it. The concise summary is to add the server IP to the firewall whitelist, disable the non-browser interception of the Baota firewall, and check the ping latency between the node server and the source server.