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- sigle-check.py 手动输入域名/链接来判断网站是否为 GH-Pages
输出结果：gh-domains.txt
- main分支的脚本，采用DNS解析到的IP来简易判断是不是Github采用的IP范围。Github有提供[CIDR格式的IP列表](https://docs.github.com/cn/authentication/keeping-your-account-and-data-secure/about-githubs-ip-addresses)，我懒得转换CIDR，直接取IP的前3位和Github的CIDR格式的IP列表直接字符串匹配，所以脚本会有很小很小很小的概率出现判断错误（把不是Github的IP当成是Github的IP）。但实际跑了几百个域名，没有发现这样的情况。
- header分支的脚本，根据http请求回传的header中是否有`Server: Github.com`字段来判断是不是Github托管的网站，判断几乎不可能出错，但是脚本跑得慢（比IP方法慢4倍，毕竟要握手）。