CDN外部访问与回源可用性状态批量检测
通过批量HTTP请求，对同URL的不同IP进行可用性测试，可用于检查多节点、CDNIP、后端IP、源站IP等可用性状态检查的场景
git clone https://github.com/BlueSkyXN/cdntest.git
注意直接复制、下载可能导致错误
net.ip 文件需要保存源站IP信息，一行一个IP
cd本程序目录，比如说 cd /root/cdntest
然后运行 bash cdntest.sh 或者其他子文件即可，其他根据中文提示操作
支持Linux和Windows（需要Git For Windows）
原版来自 https://cloud.tencent.com/developer/article/1458328
主要修改了源站IP判断的BUG（不知道哪来的）以及HEAD请求换成带UA的GET请求
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