Laravel cors 使用不了

使用这行命令就会报错
composer require barryvdh/laravel-cors

[Composer\Downloader\TransportException]
The "https://packagist.phpcomposer.com/p/provid...
" 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] [--] []...

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