Configure proxy

export http_proxy=http://10.203.0.1:5187/
export https_proxy=$http_proxy
export ftp_proxy=$http_proxy
export rsync_proxy=$http_proxy
export no_proxy="localhost,127.0.0.1,localaddress,.localdomain.com"
export PROXY_SERVER=192.168.0.222
export PROXY_USER=foo
export PROXY_PASS=bar
 
cat <<EOF>> /etc/environment
export http_proxy="http://${PROXY_USER}:${PROXY_PASS}@${PROXY_SERVER}:8080"
export https_proxy="http://${PROXY_USER}:${PROXY_PASS}@${PROXY_SERVER}:8080"
export no_proxy="localhost,127.0.0.1,foo.example.com"
EOF
 
cat <<EOF> /etc/apt/apt.conf.d/12proxy
Acquire::http::Proxy "http://${PROXY_USER}:${PROXY_PASS}@${PROXY_SERVER}:8080";
Acquire::https::Proxy "http://${PROXY_USER}:${PROXY_PASS}@${PROXY_SERVER}:8080";
EOF

Set http_proxy with special characters in password
https://linuxcheat.wordpress.com/2016/04/06/setexport-http_proxy-with-special-characters-in-password-under-unix-linux/

./unum.pl '@:!#$[]{}()"+-*'

URL Encoding (Percent Encoding)
https://www.w3schools.com/tags/ref_urlencode.asp