有点无奈，难道要自己手写，或是扩展插件都要手动下载了么
每次安装都是提示这样错误
The "https://getcomposer.org/versions" file could not be downloaded: failed to open stream: HTTP request failed!
The "https://getcomposer.org/download/1.4.2/composer.phar" file could not be downloaded: failed to open stream: HTTP request failed! 最佳答案
