使用 Composer 安装JWT失败错误信息 The "https://packagist.org/packages.json" file could not be downloaded 解决办法

The "https://packagist.laravel-china.org/packag..." file could not be downloaded (HTTP/1.1 405 Not Allowed)
https://packagist.laravel-china.org could not be fully loaded, package information was loaded from the local cache and may be out of date

[Composer\Downloader\TransportException]
The "https://packagist.laravel-china.org/p/tymo..." file could not be downloaded (HTTP/1.1 405 Not
Allowed)

出现上述错误信息是因为，composer 全局下载换成中国镜像的原因.
只需将下载源换会默认的就可以。可以使用下面命令修改 composer 配置信息

composer config -g repo.packagist composer https://packagist.phpcomposer.com

正常修改过后，再使用 composer 执行之前的操作是没有问题的，如果仍然出现上述错误，是代理上网的问题，可以查找代理上网相关资料设置