Node.JS static file web server

quick_server.js

// Node.JS static file web server
// ------------------------------
// Created from https://gist.github.com/ryanflorence/701407


var http = require("http")
  , url = require("url")
  , path = require("path")
  , fs = require("fs")
  , port = process.argv[2] || 8888;

http.createServer(function(request, response) {

  var uri = url.parse(request.url).pathname
    , filename = path.join(process.cwd(), uri);

  if (!fs.existsSync(filename))
    filename += '.html';

  fs.exists(filename, function(exists) {

    if (!exists) {
      response.writeHead(404, { "Content-Type": "text/plain" });
      response.write("404 Not Found\n");
      response.end();
      return;
    }

    if (fs.statSync(filename).isDirectory())
      filename += '/index.html';

    fs.readFile(filename, "binary", function(err, file) {

      if (err) {
        response.writeHead(500, { "Content-Type": "text/plain" });
        response.write(err + "\n");
        response.end();
        return;
      }

      var mimes = {
                    css: "text/css",
                    gif: "image/gif",
                    html: "text/html",
                    ico: "image/x-ico",
                    jpg: "image/jpeg",
                    js: "application/javascript",
                    pdf: "application/pdf",
                    png: "image/png",
                    txt: "text/plain",
                    xml: "application/xml"
                  }
        , extension = filename.replace(/.*[\.\/\\]/, '').toLowerCase()
        , mime = mimes[extension];

      console.log("- " + filename + " (" + mime + ")");

      if (typeof mime === "undefined")
        response.writeHead(200);
      else
        response.writeHead(200, { "Content-Type": mime });

      response.write(file, "binary");
      response.end();
    });
  });
}).listen(parseInt(port, 10));

console.log("Static file server running at\n  => http://localhost:" + port + "/\nCTRL + C to shutdown");