composer错误，目标计算机积极拒绝，package.json could not be downloaded

https://www.cnblogs.com/Renyi-Fan/p/9742710.html

The "https://packagist.phpcomposer.com/packages.json" file could not be download
ed: failed to open stream: 由于目标计算机积极拒绝，无法连接。

貌似不行

 

https://blog.csdn.net/ZopaulCode/article/details/79394712

设置网络代理就可以了，以下是正确做法

https://blog.csdn.net/ZopaulCode/article/details/79394620