node.js sample server

var http = require("http");
var url = require("url");
var fs = require('fs');

function start(route) {
    function onRequest(request, response) {
        var pathname = url.parse(request.url).pathname; //url directory
        var param = url.parse(request.url).query; //get parameters
        console.log(pathname);
        //route(pathname);
        switch (pathname) {
            case '/css.css':
                fs.readFile('./css.css', function (err, css) {
                    if (err) {
                        throw err;
                    }
                    response.writeHeader(200, { "Content-Type": "text/css" });
                    response.write(css); //send css
                    response.end();
                });
                break;
            case '/' :
                fs.readFile('./index.html', function (err, html) {
                    if (err) {
                        throw err;
                    }
                    response.writeHeader(200, { "Content-Type": "text/html" });
                    response.write(html); //send html
                    response.end();
                });
                break;
       }
    }
    http.createServer(onRequest).listen(8888);
    console.log("Server has started.");
}
function route(pathname) {
}
start(route); //start server