"json service" with node.js

gistfile1.js

var 
	sys = require('sys'), 
	http = require('http');

function myservice(){/*return objects*/}
	
http.createServer(function (req, res) {
/* url to call service :
   http://localhost:3000/woman:lara:croft
*/
	var 
		parts = req.url.split("/"),
		params = parts[1].split(":"),
		result = myservice(params);
	
  	res.writeHead(200, {'Content-Type': 'text/plain'});
  	res.end(""+JSON.stringify(result));
}).listen(3000, "127.0.0.1");