Composer uses Alibaba Cloud image source to accelerate

Global replacement

$ composer config -g repo.packagist composer https://mirrors.aliyun.com/composer/
$ composer clear-cache

Restore replacement

$ composer config -g --unset repos.packagist

Current project replacement

$ cd /your project path
$ composer config repo.packagist composer https://mirrors.aliyun.com/composer/

Restore replacement

$ composer config --unset repos.packagist