server.js

var PORT = 80;
var ROOT = 'src';

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

var mine = {
    "css" : "text/css",
    "gif" : "image/gif",
    "html" : "text/html",
    "ico" : "image/x-icon",
    "jpeg" : "image/jpeg",
    "jpg" : "image/jpeg",
    "js" : "text/javascript",
    "json" : "application/json",
    "pdf" : "application/pdf",
    "png" : "image/png",
    "svg" : "image/svg+xml",
    "swf" : "application/x-shockwave-flash",
    "tiff" : "image/tiff",
    "txt" : "text/plain",
    "wav" : "audio/x-wav",
    "wma" : "audio/x-ms-wma",
    "wmv" : "video/x-ms-wmv",
    "xml" : "text/xml"
};

var server = http.createServer(function(request, response) {
    var pathname = url.parse(request.url).pathname;
    var realPath = path.join(ROOT, pathname);
    var ext = path.extname(realPath);
    ext = ext ? ext.slice(1) : 'unknown';
    fs.exists(realPath, function(exists) {
        if (!exists) {
            response.writeHead(404, {
                'Content-Type' : 'text/plain'
            });

            response.write("This request URL " + pathname + " was not found on this server.");
            response.end();
        }
        else {
            fs.readFile(realPath, "binary", function(err, file) {
                if (err) {
                    response.writeHead(500, {
                        'Content-Type' : 'text/plain'
                    });
                    response.end(err);
                }
                else {
                    var contentType = mine[ext] || "text/plain";
                    response.writeHead(200, {
                        'Content-Type' : contentType
                    });
                    response.write(file, "binary");
                    response.end();
                }
            });
        }
    });
});
server.listen(PORT);
console.log("Server runing at port: " + PORT + ".");