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nodejs : require lib but remember DO NOT add an extension

I follow some example wrote on somebody's(!@$!@$#@!$) blog and I had such issue :

Error: Cannot find module '/sys'
at loadModule (node.js:492:15)
at require (node.js:618:12)
at Object. (/Users/huge/test:3:11)
at Module._compile (node.js:639:23)
at node.js:667:20
at fs:52:23
at node.js:748:9


var sys = require("/sys.js"), http = require("/http.js");
http.createServer(function (req, res){
        setTimeout(function() {
                res.sendHeader(200, {"Content-Type": "text/plain"});
                res.sendBody("Hello XD");
        }, 2000);

sys.puts("Server running at http://localhost:8000");

This error raised because I try to add extension while requiring a library.
Shortly speaking,
require("sys") is correct
require("sys.js") or require("/sys.js") is incorrect

Time passed and code changed :P, please use example wrote below for your testing

var sys = require("sys"), 
    http = require("http");

http.createServer(function (req, res){
        setTimeout(function() {
                res.writeHead(200, {"Content-Type": "text/plain"});
                res.end("Hello World\n");
        }, 2000);

Thanks for friends from irc node.js channel :)

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huang47 | personal

huang47 | personal