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var express = require("express");
var app = express();

app.listen(3000, () => {
   console.log("Server running on port 3000");
});

When you run this app you will see the message "Cannot GET /".  If you check the developer's tools console output you will see the following error "GET http://localhost:3000/ 404 (Not Found).  You are seeing this message because you have not set up any event handlers (your application has no endpoints)