return a 500 error for all requests

app.js

var http = require('http');

var server = http.createServer(function (req, res) {
    console.log(req.url);
    if (req.url !== '/api/presence' && req.url !== '/api/heartbeat') {
        res.statusCode = 500;
        res.end('error');
    } else {
        res.end('works');
    }
});

server.listen(3000);