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

function start(route,handle){
 function onRequest (request,response){
  var pathname = url.parse(request.url).pathname;
  var content;
  var postdata;

  console.log(pathname);
  response.writeHead(200,{"Content-Type":"text/html"});
  request.setEncoding("utf8");
  request.addListener("data",function(Chunk){
   postdata += postDataChunk;
  });
  request.addListener("end",function(){
   console.log("received post data end");
   content = route(handle,pathname);
  });
  response.write(content);
  response.end();
 }

 http.createServer(onRequest).listen(8080);
}

exports.start = start;

我代码是这样的，报错

throw new TypeError('first argument must be a string or Buffer');

貌似是由于浏览器请求的 /favicon.ico 导致错误，请问怎么解决呀