Koa with automatic code reload on every request

application.js

"use strict";

var koa = require('koa');
var app = koa();

var some_random_value_initialized_on_reload = Math.floor(Math.random() * 100);

// ... set up application middleware ...

app.use(function *() {
	this.body = some_random_value_initialized_on_reload;
});

module.exports = app;

my_app

#!/usr/bin/env node --harmony

"use strict";

var server;

if (process.env['KOA_RELOAD']) {
	var http = require('http');

	server = http.createServer(function() {
		for (var k in require.cache) {
			if (require.cache.hasOwnProperty(k)) {
				delete require.cache[k];
			}
		}
		require('./application').callback().apply(this, arguments);
	});
}
else {
	server = require('./application');
}

server.listen(4000);