sites/default/settings.php
$settings[‘http_client_config’][‘proxy’][‘http’] = ‘http://userid:password@proxy.xxx.jp:8089/’;
$settings[‘http_client_config’][‘proxy’][‘https’] = ‘http://userid:password@proxy.xxx.jp:8089/’;
$settings[‘http_client_config’][‘proxy’][‘no’] = [‘127.0.0.1’, ‘localhost’];