Node.JS static files host

server.js

var mime = require('mime'), fs = require('fs'), url = require('url'), zlib = require('zlib');
module.exports = function(req, res){
	var fn = url.parse(req.url).pathname;
	if (fn.substr(-1) == '/') fn += 'index.html';
	var file = __dirname + '/static' + fn;
	try {
		var ct = mime.lookup(file);
		if (ct.split('/')[0] == 'text') ct += '; charset=UTF-8';
		var stat = fs.statSync(file),
			gzip = (('accept-encoding' in req.headers) && (req.headers['accept-encoding'].split(',').map(function(e){return e.trim();}).indexOf('gzip') != -1)),
			h = {
				"Content-Type":ct,
				"Connection": "keep-alive",
				"Cache-Control": "max-age=31536000; must-revalidate",
				"Last-Modified": stat['mtime'].toUTCString()
			};
		if (gzip) h['Content-Encoding'] = 'gzip';
		if ('if-modified-since' in req.headers) {
			var cd = new Date(req.headers['if-modified-since']);
			if (stat['mtime'].toUTCString() == cd.toUTCString()) {
				res.writeHead(304,h);
				res.end();
				return;
			}
		}
		res.writeHead(200,h);
		var f = fs.createReadStream(file);
		if (gzip) {
			var gz = zlib.createGzip({level:3});
			f.pipe(gz).pipe(res);
		} else f.pipe(res);
	} catch(e) {
		res.writeHead(404,{
			"Content-Type":"text/html; charset=UTF-8",
			"Connection": "keep-alive",
		});
		res.end('404 not found');
	}
};