解决 bad response Not Found 404 (http://ruby.taobao.org/latest_specs.4.8.gz)
原因:淘宝停止基于 HTTP 协议的镜像服务 需要改用https的协议
fix步骤:
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gem sources --remove http://ruby.taobao.org/
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gem sources -a https://ruby.taobao.org/
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gem sources -l
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sudo gem install cocoapods