Node - Tell origin of request

Question

Is it possible to tell the difference between a request coming directly from a URL in a browser vs. a resource being called from a remote web page?

For example, I would

Answer 1

I think you are looking for the referer string in the request.header.

So the simple version would look like this:

http.createServer(function (req, res) {
  var ref = req.headers.referer;

  if(ref) {
    // serve special content
  }
  else {
    // serve regular homepage
  }
}).listen(1337, '127.0.0.1');

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edited the answer to reflect the input from anu below - it should be referer