在 Postman 网页版本中，当我使用Get localhost:8080发送请求时，它只是给出了一个错误。请给我讲讲情况。我的VS代码有问题吗？

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

/* app.use((req, res)=> {
}); */

app.get("/", (req, res) => {
  res.send("This is the home page");
});

app.get("/cats", (req, res) => {
  res.send("MEOW");
});

app.get("/dogs", (req, res) => {
  res.send("woof");
});

app.post("dogs", (req, res) => {
  res.send("Post request to /cats. This is diffrent than get");
});

app.get("*", (req, res) => {
  res.send("I don't know what that path");
});

app.listen(8080, () => {
  console.log("Listening on port 8080");
});