turns out this is what I need
curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | sh
but I am getting 403 error
this I rustup with installs rust in our system, so it will install rust from other websites I think
so please try this command in your system and whitelist all other URLs it needs to install in the system.
please help me, I am on deadline.