Laravel跨域Laravel CORS安装不成功!

使用->
composer require barryvdh/laravel-cors

结果报错

[Composer\Downloader\TransportException]
The "https://packagist.phpcomposer.com/p/provider-2019-01%2426ee8ad976171b9f5f3016f65523e3b4d24d6996d586fe75f3c675f1dc19e07b.json
" file could not be downloaded (HTTP/1.1 404 Not Found)

require [--dev] [--prefer-source] [--prefer-dist] [--no-progress] [--no-suggest] [--no-update] [--no-scripts] [--update-no-dev] [--upd
ate-with-dependencies] [--update-with-all-dependencies] [--ignore-platform-reqs] [--prefer-stable] [--prefer-lowest] [--sort-packages]
[-o|--optimize-autoloader] [-a|--classmap-authoritative] [--apcu-autoloader] [--] [<packages>]...