set proxy in wsl2

set_proxy.sh

set_proxy() {
        export hostip=$(cat /etc/resolv.conf | grep nameserver | awk '{ print $2 }')
        local proxy_url="http://${hostip}:7890"
        export https_proxy="$proxy_url"
        export http_proxy="$proxy_url"
        export all_proxy="$proxy_url"
}

unset_proxy() {
        export https_proxy="" http_proxy="" all_proxy=""
}