serverkeepalive.js

var port, server, service,
    system = require('system');

if (system.args.length !== 2) {
    console.log('Usage: serverkeepalive.js <portnumber>');
    phantom.exit(1);
} else {
    port = system.args[1];
    server = require('webserver').create();

    service = server.listen(port, { keepAlive: true }, function (request, response) {
        console.log('Request at ' + new Date());
        console.log(JSON.stringify(request, null, 4));

        var body = JSON.stringify(request, null, 4);
        response.statusCode = 200;
        response.headers = {
            'Cache': 'no-cache',
            'Content-Type': 'text/plain',
            'Connection': 'Keep-Alive',
            'Keep-Alive': 'timeout=5, max=100',
            'Content-Length': body.length
        };
        response.write(body);
        response.close();
    });

    if (service) {
        console.log('Web server running on port ' + port);
    } else {
        console.log('Error: Could not create web server listening on port ' + port);
        phantom.exit();
    }
}