node.jsでシンプルなwebサーバー

カレントディレクトリ以下にあるファイルにアクセスできるだけのシンプルなwebサーバー
(子ディレクト下のファイルも可)
pythonの「SimpleHTTPServer」的なもの

server.js

var http = require("http"),
    url = require("url"),
    path = require("path"),
    fs = require("fs"),
    port = process.argv[2] || 8888;


http.createServer(function(request, response) {

    var Response = {
        "200":function(file, filename){
            var extname = path.extname(filename);
            var header = {
                "Access-Control-Allow-Origin":"*",
                "Pragma": "no-cache",
                "Cache-Control" : "no-cache"       
            }

            response.writeHead(200, header);
            response.write(file, "binary");
            response.end();
        },
        "404":function(){
            response.writeHead(404, {"Content-Type": "text/plain"});
            response.write("404 Not Found\n");
            response.end();

        },
        "500":function(err){
            response.writeHead(500, {"Content-Type": "text/plain"});
            response.write(err + "\n");
            response.end();

        }
    }


    var uri = url.parse(request.url).pathname
    , filename = path.join(process.cwd(), uri);

    fs.exists(filename, function(exists){
        console.log(filename+" "+exists);
        if (!exists) { Response["404"](); return ; }
        if (fs.statSync(filename).isDirectory()) { filename += '/index.html'; }

        fs.readFile(filename, "binary", function(err, file){
        if (err) { Response["500"](err); return ; }
            Response["200"](file, filename);   
        }); 

    });


}).listen(parseInt(port, 10));

console.log("Server running at http://localhost:" + port );

使い方

$ node server.js