Using localhost in an online ROBLOX game

I have a Discord bot which uses the express() function to create an application which listens to port 3000 (localhost:3000). However, how would I get information from a localhost via HttpService in an online ROBLOX game? Any help is appreciated.

Try making the request to your ip. so http://your.ip.here

do Http:GetAsync(http://your.ip.here)