curl 命令默认用的User-Agent是curl/7.64.0
不太好，现在想让他全局curl命令都是别的agent头：
创建 ~/.curlrc 文件，在文件中加入：
user-agent="Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:68.0) Gecko/20100101 Firefox/68.0"
然后再curl，就不是默认的了。
curl 命令自动修改user agent
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