serve

var http = require('http'),
    path = require('path'),
    fs = require('fs'),
    util = require('util');

var extdir = '/extensions';
// create the server

http.createServer(_handleReq).listen(3000);
console.log('Server running, listening on port 3000');




function _handleReq(req, res){
    var root = "..",
    url = "",
    contentType = "text/plain",
    filePath = "";


    if(req.method !== 'GET'){
        res.writeHead(405);
        res.end();
        return;
    }

    //ensure we get a file to serve
    if( '.' + req.url !== './' ){
        filePath = root + extdir + req.url;
        path.exists(filePath, serveFile);
    } else {
        res.writeHead(400);
        res.end("Please resquest a file","utf8");
        return;
    }


    function serveFile(file){
        if(file === false){
            res.writeHead(404);
            res.end();
            return;
        }

        var stream = fs.createReadStream(filePath);

        //put the file in a stream for network transferring
        stream.on('error', function (error) {
            res.writeHead(500);
            res.end();
            return;
        });

        var mimeTypes = {
            '.7z': 'application/x-7z-compressed',
            '.zip': 'application/zip'

        };

        //get the mimeType
        contentType = mimeTypes[path.extname(filePath)];

        res.setHeader('Content-Type', contentType);
        res.writeHead(200);

        util.pump(stream, res, function (error) {
            //error sending the file
            res.end();
            return;
        });

    }

   
}