(Replit) How do I send any other subdomain that doesn’t exist to a certain 404 page?

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I’m confused with this one this is my repl that I’m doing this in https://replit.com/@JonathanPachla/A-blog I’d like to send someone who enters something other than a exsisting subdomain after the domain to get sent to a certain 404 page but I don’t know how to.

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