composer更新时遇到错误：
[Composer\Downloader\TransportException]
Error while processing content unencoding: Unknown failure within decompression software.
此时清理一下缓存，重置一下仓库即可
composer clearcache
composer config -g repo.packagist composer https://packagist.org
原文：https://www.cnblogs.com/GarfieldTom/p/14592319.html