Node.js http create server using configuration file

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

var config = JSON.parse(fs.readFileSync("./files/server_config.json"));
var host = config.host;
var port = config.port;

var server = http.createServer(function(request, response){
  console.log("Received request: " + request.url);
  fs.readFile("./public" + request.url, function(error, data){
    if (error) {/*from  w  w w  .j av a 2  s.  co m*/
      response.writeHead(404, {"Content-type":"text/plain"});
      response.end("Sorry the page was not found");
    } else {
      response.writeHead(200, {"Content-type":"text/html"});
      response.end(data);
    }
  })

  
});

server.listen(port, host, function(){
  console.log("Listening " + host + ":" + port);
});

fs.watchFile("./files/server_config.json", function(){
  config = JSON.parse(fs.readFileSync("./files/server_config.json"));
  host = config.host;
  port = config.port;
  server.close();
  server.listen(port, host, function(){
    console.log("Now listening " + host + ":" + port);
  });  
});