现在的地址是成了 https://gems.ruby-china.com/
移除掉rubygems.org
gem sources --remove https://rubygems.org/
添加镜像源
gem sources -a https://gems.ruby-china.com/
检查当前Source列表
gem sources
Error fetching https://ruby.taobao.org/:RubySass淘宝镜源无效解决
原文：https://www.cnblogs.com/yangda/p/13213345.html