安装compoer 报错 [Composer\Downloader\TransportException] Content-Length mismatch, received 28935 byt

 [Composer\Downloader\TransportException]
  Content-Length mismatch, received 28935 bytes out of the expected 1871484

require [--dev] [--prefer-source] [--prefer-dist] [--no-progress] [--no-suggest] [--no-update] [--no-scripts] [--update-no-dev] [--update-with-dependencies] [--update-with-all-dependencies] [--ignore-platform-reqs] [--prefer-stable] [--prefer-lowest] [--sort-packages] [-o|--optimize-autoloader] [-a|--classmap-authoritative] [--apcu-autoloader] [--] [<packages>]...
解决办法：
更换源

//中国全量镜像
composer config repo.packagist composer https://packagist.phpcomposer.com

//阿里
composer config -g repo.packagist composer https://mirrors.aliyun.com/composer/