关于composer安装laravel的问题

Your configuration does not allow connection to http://packagist.phpcomposer.com
. See https://getcomposer.org/doc/06-config.md#secure-http for details.
http://packagist.phpcomposer.com could not be fully loaded, package information
was loaded from the local cache and may be out of date

请问这个问题如何解决了？这个问题折腾了我好久。