vi /usr/local/opnsense/service/conf/configd.conf
HTTP_PROXY=http://our-proxy.com:8080
HTTPS_PROXY=http://our-proxy.com:8080
http_proxy=http://our-proxy.com:8080
https_proxy=http://our-proxy.com:8080
FTP_PROXY=http://our-proxy.com:8080
ftp_proxy=http://our-proxy.com:8080