解决问题-There appears to be trouble with your network connection. Retrying...

使用yarn install 命令时，偶尔出现此错误：There appears to be trouble with your network connection. Retrying...

可以通过以下步骤解决（亲测OK）

1、删除https-proxy、proxy

yarn config delete https-proxy

yarn config delete proxy

2、删除成功后，则重新设置https-proxy、proxy

yarn config get https-proxy
yarn config get proxy

3、在项目中重新使用yarn install命令