Corporate proxy is blocking rustup download from the .rs domain, is there an alternate download location?
LOL for me even static.rust-lang.org is blocked. I will check with my network and security teams. It is not that difficult to get it opened I believe. I think some generic rules are blocking them.
Can they be hosted on github?
Even if the rustup bootstrap installer is on github, it's going to be pulling stuff from static.rust-lang.org.
Strange I have access to crates.io . Is there any metadata difference between crates.io and static.rust-lang.org?
Sure - they're different domains after all. It'd depend on the workings of your proxy blocking rules.