Does res.end() not ends the http.createServer() callback function?

Question

I have question about res.end() method available with require("http).createServer(). So the tutorial I was watching the following worked:

require("http").createServer((req, res) => {
  if (req.url === "/") {
    res.end("Here is home Page");
  }
  if (req.url === "/about") {
    res.end("Here is about page");
  }
  res.end("404 Page not found");
}).listen(8080);

But when I try to run the snippet it give the following error:

ERR_STREAM_WRITE_AFTER_END

I know why this is happening. My question is why res.end() is not stopping the createServer() callback. If you know please give some advice.