Adds logs, reviews code alignment and fixes path.exists

static_server.js

var http = require("http");
var url  = require("url");
var path = require("path");
var fs   = require("fs");
var port = process.argv[2] || 8000;
 
http.createServer(function(request, response) {
  console.log(request["method"] + " " + request["url"]);
 
  var uri      = url.parse(request.url).pathname;
  var filename = path.join(process.cwd(), uri);
  
  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;
      }
 
      response.writeHead(200);
      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");