composer 报错

晚上 composer require monolog/monolog 失败后，所有composer install / composer update 都失败；
一直报如下错误

https://mirrors.aliyun.com/composer could not be fully loaded (curl error 61 while downloading https://mirrors.aliyun.com/composer/p2/guzzlehttp/guzzle.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Unknown failure within decompression software.), package information was loaded from the local cache and may be out of date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/guzzlehttp/guzzle.json: Error while processing content unencoding:   
  Unknown failure within decompression software.                                                                                              

机器PHP版本7.1，require monolog/monolog 默认会引入2.0版本，而2.0版本需要PHP7.2以上，本地PHP版本不满足要求，怀疑在执行的时候缓存了错误的decompression包

执行 composer clear-cache 后恢复；改为引用monolog1.0版本 "monolog/monolog": "~1.0" 后正常