Node.js

server.js

var http = require("http"),
    url = require("url"),
    path = require("path"),
    fs = require("fs");

http.createServer(function (req, res) {
  var pathname=__dirname+url.parse(req.url).pathname;
  if (path.extname(pathname)=="") {
    pathname+="/";
  }
  if (pathname.charAt(pathname.length-1)=="/"){
    pathname+="index.html";
  }

  fs.exists(pathname,function(exists){
    if(exists){
      switch(path.extname(pathname)){
        case ".html":
          res.writeHead(200, {"Content-Type": "text/html"});
          break;
        case ".js":
          res.writeHead(200, {"Content-Type": "text/javascript"});
          break;
        case ".css":
          res.writeHead(200, {"Content-Type": "text/css"});
          break;
        case ".gif":
          res.writeHead(200, {"Content-Type": "image/gif"});
          break;
        case ".jpg":
          res.writeHead(200, {"Content-Type": "image/jpeg"});
          break;
        case ".png":
          res.writeHead(200, {"Content-Type": "image/png"});
          break;
        default:
          res.writeHead(200, {"Content-Type": "application/octet-stream"});
      }

      fs.readFile(pathname,function (err,data){
        res.end(data);
      });
    }else{
      res.writeHead(404, {"Content-Type": "text/html"});
      res.end("404 Not Found");
    }
  });

}).listen(9001, "127.0.0.1");

console.log("Server running at http://127.0.0.1:9001/");