在这里放置解决方案

C:\wamp\www\LARAVEL>set http_proxy=http://mnel:******@192.168.20.4:8080 C:\wamp\www\LARAVEL>set https_proxy=https://mnel:******@192.168.20.4:8080

然后我再次运行install composer命令并进行存储！

I then ran the install composer command again and presto!

https://***.com/a/24958700/2240163

感谢@mneute