How do I allow any device, e.g., iPhone, to connect over a WLAN to my Mac&#39;s localhost server?

On my Mac, I&#39;m running a &quot;Hello World&quot; HTTP [Node.js][1] server that serves a page, which Safari opens successfully, at `http://localhost:1337`. And, running `ipconfig getifaddr en1` in Terminal outputs `192.168.1.9`.

But, Safari, on both iPhone &amp; Mac, displays &quot;Safari can&#39;t connect to the server&quot; when it tries to open `http://192.168.1.9:1337`.

I don&#39;t think this should involve [port forwarding][2] because I only want the HTTP server to be available privately, not publicly.

Related:

* https://stackoverflow.com/questions/5666018/accessing-localhost-from-iphone-in-same-network
* https://superuser.com/questions/308451/connect-to-localhost-from-another-computer
* https://superuser.com/questions/400752/can-we-run-local-server-over-local-network-without-internet-access
* https://serverfault.com/questions/254947/accessing-localhost-xampp-from-another-computer-over-lan-network-how-to

  [1]: http://nodejs.org
  [2]: http://en.wikipedia.org/wiki/Port_forwarding

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Connect Device to Mac localhost Server?