极大可能是网络不稳定，或者github地址存放在需要代理的项目里
解决方法：
win+i 进入设置
选择网络-代理-关闭 “使用设置脚本”
或者根据链接，进入pac文件，将github的地址从脚本文件中删除，或移动到不需要代理的栏目里。
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