node.js - The Node Beginner Book TypeError: Cannot call method 'writeHead' of undefined -

i follow the node beginner book on http://www.nodebeginner.org/ while encounder typeerror。 i've searched no 1 can solve error. error shows follows

d:\delbert\nodejs\proj\requesthandlers.js:7     response.writehead(200, {"content-type":"text/plain"});              ^ typeerror: cannot call method 'writehead' of undefined     @ d:\delbert\nodejs\proj\requesthandlers.js:7:14     @ childprocess.exithandler (child_process.js:635:7)     @ childprocess.eventemitter.emit (events.js:98:17)     @ maybeclose (child_process.js:743:16)     @ socket.<anonymous> (child_process.js:956:11)     @ socket.eventemitter.emit (events.js:95:17)     @ pipe.close (net.js:465:12) 

and source code:

//---------//
//server.js//
//---------//

var http = require("http"); var url = require("url");  function start(route, handle) {   function onrequest(request, response) {     var pathname = url.parse(request.url).pathname;     console.log("request " + pathname + " received.");      route(handle, pathname, request, response);   }    http.createserver(onrequest).listen(8888);   console.log("server has started."); }  exports.start = start; 

//--------//
//index.js//
//--------//

var server = require("./server"); var router = require("./route"); var requesthandlers = require("./requesthandlers");  var handle = {} handle["/"] = requesthandlers.start(); handle["/start"] = requesthandlers.start; handle["/upload"] = requesthandlers.upload;  server.start(router.route, handle); 

//--------//
//route.js//
//--------//

function route(handle, pathname, response) {   console.log("about route request " + pathname);   if (typeof handle[pathname] === 'function') {     handle[pathname](response);   } else {     console.log("no request handler found " + pathname);     response.writehead(404, {"content-type": "text/plain"});     response.write("404 not found");     response.end();   } }  exports.route = route; 

//------------------//
//requesthandlers.js//
//------------------//

var exec = require("child_process").exec;  function start(response) {   console.log("request handler 'start' called.");    exec("ls -lah", function (error, stdout, stderr) {     response.writehead(200, {"content-type":"text/plain"});     response.write(stdout);     response.end();   }); }  function upload(response) {   console.log("request handler 'upload' called.");   response.writehead(200, {"content-type": "text/plain"});   response.write("hello upload");   response.end(); }  exports.start = start; exports.upload = upload; 

i don't know how error comes. stuck there paste code book.

i tried typeerror: cannot call method 'writehead' of undefined , http://cnodejs.org/topic/4fbca9123a7ec1d151038ac1 did not work.

would please me?

the book indeed seem have errors then.

here couple of errors spotted right away:

1. server.start() calls route() this: route(handle, pathname, request, response);, route() defined this: function route(handle, pathname, response)

2. (and source of specific error) index.js has handle["/"] = requesthandlers.start(); instead of handle["/"] = requesthandlers.start;