Composer under proxy?

Question

proxy

is there a way to make the composer work under a proxy? the distribution kit on Windows does not swing.
composer install from open server command line can't reach host

D:\open\OpenServer\domains\localhost\yii2>composer install
Loading composer repositories with package information
Installing dependencies (including require-dev)

  [Composer\Downloader\TransportException]
  The "http://packagist.org/p/provider-2013$cf2677ffd4e77b2b311e7472f978ca6bac654427d739010868d1afec9b29684a.json" file could not be downloaded: php_network_getaddres
  ses: getaddrinfo failed: ???? ???? ??????????.
  failed to open stream: php_network_getaddresses: getaddrinfo failed: ???? ???? ??????????.

Answer 1

set http_proxy=http://proxy.com
composer install