text: /**
   * Created by Administrator on 2016/10/12.
   */
  
  var http = require('http');
  var fs = require('fs');
  var path = require('path');
  var mime = require('mime');
  var cache = {};
  
  function send404(response) {
      response.writeHead(404,{'Content-Type':'text/plain'});
      response.write('Error 404: resource not found.');
      response.end();
  }
  
  function sendFile(response, filePath, fileContents) {
      response.writeHead(
          200,
          {"content-type": mime.lookup(path.basename(filePath))}
      );
      response.end(fileContents);
  }
  
  function serveStatic(response, cache, absPath) {
      if(cache[absPath]) {
          sendFile(response, absPath, cache[absPath]);
      } else {
          fs.exists(absPath,function (exists) {
             if(exists){
                 fs.readFile(absPath,function (err, data) {
                     if(err){
                         send404(response);
                     }else{
                         cache[absPath]=data;
                         sendFile(response,absPath,data);
                     }
                 });
             }else{
                 send404(response);
             }
          });
      }
  }
  
  var server = http.createServer(function (request,response) {
      var filePath = false;
  
      if(request.url == '/'){
          filePath='public/index.html';
      }else{
          filePath='public'+request.url;
      }
  
      var absPath='./'+filePath;
      serveStatic(response,cache,absPath);
  });
  
  server.listen(3000,function () {
      console.log("3000");
  });
  
  var chatServer = require('./lib/chat_server');
  chatServer.listen(server);
  
  
  
  
  
  
  
  
  
  
  
  
  