Your configuration does not allow connection to http://packagist.org

composer update/install 出现如下错误：

[Composer\Downloader\TransportException]                                                                                          
  Your configuration does not allow connection to http://packagist.org. See https://getcomposer.org/doc/06-config.md#secure-http f  
  or details.     

解决方法：
禁用 https 请求

//设置当前
composer config secure-http false

或

//全局设置
composer config -g secure-http false

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