命令行执行
/usr/bin/ruby -e "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)"
报错：
Failed to connect to raw.githubusercontent.com port 443: Connection refused error: Error: 7，
解决办法：
重装command line tools，再执行安装指令，homebrew安装成功。
具体步骤：
1、removing the old tools
$ sudo rm -rf /Library/Developer/CommandLineTools
2、install xcode command line tools again
$ sudo xcode-select --install
3、重新安装
/usr/bin/ruby -e "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)"
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