Composer报错:
https://mirrors.aliyun.com/composer could not be fully loaded (curl error 61 while downloading https://mirrors.aliyun.com/composer/p2/laravel/laravel.json: Error while processing content unencoding: Unknown failure within decompression software.), package information was loaded from the local cache and may be out of date
[Composer\Downloader\TransportException] curl error 61 while downloading https://mirrors.aliyun.com/composer/p2/laravel/laravel.json: Error while processing content unencoding: Unknown failure wi thin decompression software.
[Composer\Downloader\TransportException] Error while processing content unencoding: Unknown failure within decompression software.错误提示是说解压文件发生错误，检查环境的拓展并没有缺少压缩拓展。
检查运行命令之后返回结果的一段后发现并不是因为压缩拓展的问题。最后一句话中package information was loaded from the local cache and may be out of date说明存在的问题是本地缓存过期引起的。所以清除composer本地缓存就可以解决。
清除缓存的命令：
$ composer clearcache
