https://repo.packagist.org could not be fully loaded (Unable to use a proxy: malformed http_proxy url), package information was loaded from the local cache and may be out of date [Composer\Downloader\TransportException] Unable to use a proxy: malformed http_proxy url windows中命令行要使用代理，http_proxy和https_proxy有如下写法： 直接执行 set http_proxy=0 然后再执行 composer 就可以了，这个问题会反复出现，特别是在一些网络本身走了代理的情况下。