Nodejs入门

老大让做一个简单的Http服务器响应的东西，可是服务器端的脚本一点点也不会，ruby到现在也没怎么入门，想起nodejs可以做简单快速的服务器端，就用这个了

    其实需求很简单就是响应URL的参数请求做一些简单的响应，nodejs用的是javascript，方法也不是很复杂，module也不用太多，觉得挺适合的，于是就从0开始了
    下载源码，编译，看sample，就开始写了。
  源码如下

var sys = require("util"), 
    http = require("http"),url = require("url"); 
 
var  fs = require("fs"); 
var querystring = require("querystring"); 
 
http.createServer(function(request, response) { 
    console.log("request version" + request.httpVersion + " request headers " + request.headers["Content-Type"] + "  " + JSON.stringify(request.headers)) ; 
    var pathname = url.parse(request.url).pathname; 
    var search = url.parse(request.url).search; 
    var query = url.parse(request.url).query; 
    if(pathname == '/update.zip'){ 
        fs.readFile("./update.zip", "binary", function(error, file) { 
        if(error) { 
        response.writeHead(500, {"Content-Type": "text/plain"}); 
        response.write(error + "/n"); 
        response.end(); 
        } else { 
        response.writeHead(200, {"Content-Type": "application/zip"}); 
        response.write(file, "binary"); 
        response.end(); 
    } 
      }); 
    }else{ 
        console.log("pathname = " + pathname+"search "+search + " query = "+ query); 
        response.writeHeader(200, {"Content-Type": "text/html"}); 
        var param =  querystring.parse(query); 
        var srcversion =  param["swv"]; 
        console.log(" param = " + param["hw"]); 
//      response.writeHeader(200, {"Content-Type": "text/html"}); 
        response.write('<?xml version="1.0" encoding="UTF-8"?>'); 
        response.write('<OTAPackage><srcVersion>'+srcversion +'</srcVersion>'); 
        response.write('<dstVersion>'+'higher version'+'</dstVersion>'); 
        response.write('<description><![CDATA[OTA_030_042]]></description>'); 
        response.write('<downloadURL>http://192.168.0.154:8080/update.zip</downloadURL>'); 
        response.write('<size>7953346</size>'); 
        response.write('<priority>Optional</priority>'); 
        response.write('<sessionId>007d0d21-64c8-4768-9f91-d1ae5268113f</sessionId>'); 
        response.write('</OTAPackage>'); 
        response.end(); 
    } 
}).listen(8080,"192.168.0.154"); 
sys.puts("Server running at http://www.2cto.com /");
就是这么简单的东西，刚开始的时候response没有写end，结果只能第一次响应正确，后面的全都挂了，http协议也不是太熟悉，具体原因也没搞清楚，有知道的高手请告知一下，谢谢了