Simple server expanding esi:include tags from local html files. Very usefull to test your static pages before uploading to Akamai. Written in node.js.

esi-server.js

/**
 * Simple server expanding esi:include tags from local html files.
 * Very usefull to test your static pages before uploading to Akamai.
 * 
 *     $ npm install express
 * 
 * Now you are ready to run preview server:
 * 
 *     $ node esi-server.js
 * 
 * @author Tomasz Szarstuk <szarsti at gmail>
 * @license MIT
 */

var express = require('express'),
  fs = require('fs'),
	url = require('url'),
	http = require('http'),
	app = express();

function handleEsiFile(req, res) {
  var name = req.params[0];
	fs.readFile(__dirname + '/html/' + name, 'utf-8', function(err, data) {
		if (err) {
			console.log('Error reading file: ', err);
			res.send(500, 'Error reading file: ', err.message);
			return;
		}
		var re = /<esi:include[^>]*src="([^"]*)"[^>]*>/g,
			html = data;
		res.type('html');
		function expand(idx) {
			var m = re.exec(html),
				lastIndex,
				u;
			if (m) {
				lastIndex = re.lastIndex;
				res.write(html.slice(idx, lastIndex - m[0].length));
				u = url.parse(m[1]);
				http.get({
					host: u.host,
					port: u.port || 80,
					path: u.path
				}, function(response) {
					response
						.on('data', function(chunk) {
							res.write(chunk);
						})
						.on('end', function () {
							expand(lastIndex);
						});		
				}).on('error', function (err) {
					console.log('Error expanding esi:include src: ' + err);
				});
			} else {
				res.write(html.slice(idx));
				res.end();
			}
		}
		expand(0);
	});
}

app.configure(function () {
	app.get(/^\/([\w\.-]+\.html)/, handleEsiFile);
	app.use("/static/", express.static(__dirname + '/static/'));
});
app.listen(3001);
console.log('ESI pages preview running on http://localhost:3001/');