simple http server

gistfile1.js

#!/usr/bin/env node
var http = require("http"),
    url = require("url"),
    path = require("path"),
    fs = require("fs"),
    port = process.argv[2] || 8888,
    mime;
try {
    mime = require("mime");
}
catch(err){}
http.createServer(function(request, response) {
        var defaultFilename = '/index.htm';
        var uri = url.parse(request.url).pathname
            , filename = path.join(process.cwd(), uri);
        var readFile = function(filename) {
            fs.readFile(filename, "binary", function(err, file) {
                    if(err) {
                        response.writeHead(500, {"Content-Type": "text/plain"});
                        response.write(err + "\n");
                        response.end();
            return;
                    }
                    if(mime) response.setHeader("Content-Type", mime.lookup(filename));
                    response.writeHead(200);
                    response.write(file, "binary");
                    response.end();
        });
    };
        fs.exists(filename, function(exists) {
            if (exists) {
                    if (fs.statSync(filename).isDirectory()) filename += defaultFilename;
                    readFile(filename);
                    return;
                }
                if (filename.slice(-2, -1) == '/' || filename.lastIndexOf('.') == -1) {
                    filename = path.join(process.cwd(), defaultFilename);
                    readFile(filename);
                    return;
                }
                response.writeHead(404, {"Content-Type": "text/plain"});
                response.write("404 Not Found\n");
                response.end();
            });
    }).listen(parseInt(port, 10), '0.0.0.0');
console.log("Static file server running at\n  => http://0.0.0.0:" + port + "/\nCTRL + C to shutdown");