使用composer下載依賴時，總是報：由于連接方在 一段時間后沒有正確答復或連接的主機沒有反應，連接嘗試失敗相關代碼PS E:wwwroot3dnote> composer require yiisoft/yii2-giiUsing version ^2.0 for yiisoft/yii2-gii./composer.json has been updatedLoading composer repositories with package informationThe "https://packagist.phpcomposer.com/packages.json" file could not be downloaded: failed to open stream: 由于連接方在 一段時間后沒有正確答復或連接的主機沒有反應，連接嘗試失敗。https://packagist.phpcomposer... could not be fully loaded, package information was loaded from the local cache and may be out of date