当我尝试将 RestKit 代码添加到终端时出现以下错误。我错过了什么?
git submodule add git://github.com/RestKit/RestKit.git RestKit
Cloning into RestKit...
github.com[0: 207.97.227.239]: errno=Operation timed out
fatal: unable to connect a socket (Operation timed out)
Clone of 'git://github.com/RestKit/RestKit.git' into submodule path 'RestKit' failed