gistfile1.js

// Express
    app.post('/location', checkLocation, function(req, res){
	server.getService('geo', function(geo) {
	    var location= [req.lat,req.lon];
	    geo.delegate(req.key, location, function(data) {
		res.send(data, 200); // ---> data is NOT undefined
	    });
	});
    });

// Superagent
	    var data= {key:'testapikey',lat:5,lon:-74};
	    request
		.post("http://localhost:8080/location")
		.send(data)
		.end(function(call) {
		    var res= call.res;
		    res.statusCode.should.equal(200);

		    console.log(res.body); // --> undefined

		    done();
		});