export proxy_host=${1:-127.0.0.1}
export proxy_port=${2:-3128}
export proxy="$proxy_host:$proxy_port"
export HTTP_PROXY="http://$proxy/"
export http_proxy=$HTTP_PROXY
export HTTPS_PROXY=$HTTP_PROXY
export https_proxy=$HTTP_PROXY
export FTP_PROXY=$HTTP_PROXY
export ftp_proxy=$HTTP_PROXY