sass_安装问题（ERROR: Could not find a valid gem 'sass' (>= 0), here is why: Unable to download data from https://rubygems.org/ - SSL_connect returned=1 errno=0 state=SSLv3 read server certificate B: cert）

安装sass前需安装ruby

安装好ruby好打开命令行，输入

 gem install sass

出现错误：

 ERROR: Could not find a valid gem 'sass' (>= 0), here is why:
 Unable to download data from https://rubygems.org/ - SSL_connect returned=1 errno=0 state=SSLv3 read server certificate B: certificate verify failed (https://api.rubygems.org/specs.4.8.gz)

网上的解决方案是换成国内镜像https://ruby.taobao.org
代码：

 gem sources --add https://ruby.taobao.org

然而试了一下发现还是报错：

 Error fetching https://ruby.taobao.org/:
 SSL_connect returned=1 errno=0 state=SSLv3 read server certificate B: certificate verify failed (https://rubygems-china.oss-cn-hangzhou.aliyuncs.com/specs.4.8.gz)

去stackoverflow上搜索了一番，发现可以这样：

 gem sources --add http://rubygems.org

会提示：

 https://rubygems.org is recommended for security over http://rubygems.org/

忽略，现在再试试gem install sass, 成功：

 Fetching: sass-3.4.22.gem (100%)
 Successfully installed sass-3.4.22
 Parsing documentation for sass-3.4.22
 Installing ri documentation for sass-3.4.22
 Done installing documentation for sass after 18 seconds
 1 gem installed

原文链接：https://www.jianshu.com/p/968697eb42eb