最近在安装ohmyzsh的过程中遇到这个问题：
% sh -c "$(curl -fsSL https://raw.github.com/ohmyzsh/ohmyzsh/master/tools/install.sh)"
curl: (7) Failed to connect to raw.githubusercontent.com port 443: 拒绝连接
域名被墙了，要么搭ti zi，还有一种办法是在hosts文件中添加域名到ip的映射，
域名的ip可以同这个网址获得：www.ipaddress.com/
在/etc/hosts 文件中添加以下内容即可：
199.232.68.133 raw.githubusercontent.com
199.232.68.133 user-images.githubusercontent.com
199.232.68.133 avatars2.githubusercontent.com
199.232.68.133 avatars1.githubusercontent.com
完美解决上面的问题：
% sh -c "$(curl -fsSL https://raw.github.com/ohmyzsh/ohmyzsh/master/tools/install.sh)"
Cloning Oh My Zsh...
正克隆到 '/home/zjl/.oh-my-zsh'...
remote: Enumerating objects: 1155, done.
remote: Counting objects: 100% (1155/1155), done.
remote: Compressing objects: 100% (1121/1121), done.
remote: Total 1155 (delta 20), reused 1074 (delta 18), pack-reused 0
接收对象中: 100% (1155/1155), 775.06 KiB | 11.00 KiB/s, 完成.
处理 delta 中: 100% (20/20), 完成.
Looking for an existing zsh config...
Found ~/.zshrc. Backing up to /home/zjl/.zshrc.pre-oh-my-zsh
Using the Oh My Zsh template file and adding it to ~/.zshrc.
__ __
____ / /_ ____ ___ __ __ ____ _____/ /_
/ __ \/ __ \ / __ `__ \/ / / / /_ / / ___/ __ \
/ /_/ / / / / / / / / / / /_/ / / /_(__ ) / / /
\____/_/ /_/ /_/ /_/ /_/\__, / /___/____/_/ /_/
/____/ ....is now installed!
Before you scream Oh My Zsh! please look over the ~/.zshrc file to select plugins, themes, and options.
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