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I can't understand how the URL l that we gave to the program functions as we want to.

Hello, why do we put this '/' in the if statement? what does that have to do with our URL? explain to me if you can why do we put that? I mean in this video the teacher didn't explain clearly why we put this instead of some sort of a normal URL

function home(request, response) {
  if(request.url === '/') {
    response.writeHead(200, {'Content-Type': 'text/plain'});

Thanks, Stavros