解決Mac終端下載報錯 curl: (7) Failed to connect to raw.githubusercontent.com port 443: Connection refused
一、錯誤來源
在下載node.js包管理工具時發現居然連線不上地址，錯誤如下：
二、分析與解決
1、測試連結
經過測試，發現連線不上，訪問被拒絕。
2、查詢網址資訊
網站IP地址查詢連線：https://githubusercontent.com.ipaddress.com/raw.githubusercontent.com
查詢結果如下：
3、配置hosts
使用的軟體是SwitchHosts，SwitchHosts 一個修改、管理、切換多個 hosts 方案的開源工具。
下載地址：https://oldj.github.io/SwitchHosts/#cn
4、結果
重新輸入命令，下載nvm工具成功。
curl -o- https://raw.githubusercontent.com/creationix/nvm/v0.30.2/install.sh | bash
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