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You need a http:// or https:// prefix to tell the browser to navitage to another site, otherwise the request defaults to being a relative path.

I see, I assume that is true for all TLDs? (Can you tell I don't do much web front-end lol)

If it's a relative path then it's not a TLD. It's only a TLD when it's part of a domain name.

Yes.

Or just //