chrisveness/app.js

## app.js
var koa        = require('koa');
var session    = require('koa-session');
var flash      = require('koa-flash');
var router     = require('koa-router');
var handlebars = require("koa-handlebars");

var app = koa();

app.keys = ['foo'];
app.use(session({ domain: '.localhost' }, app)); // THIS FAILS
//app.use(session(app)); // THIS WORKS
app.use(flash());

app.use(handlebars({ extension: ['html'], viewsDir: './', partialsDir: './' }));

app.use(router(app));

var handler = {};

handler.get = function*() {
    var context = {};
    if (this.flash) context.flashmsg = this.flash.flashmsg;
    console.log('handler.get flash', this.flash);
    yield this.render('flash', context);
};

handler.post = function*() {
    this.flash = { flashmsg: 'This is a flash' };
    console.log('handler.post flash', this.flash);
    this.redirect(this.url);
};

var routes = function(app) {
    app.get('/flash',  handler.get);
    app.post('/flash', handler.post);
};
routes(app);

app.listen(process.env.PORT||3000);
console.log(process.version+' listening on port '+(process.env.PORT||3000)+' ('+app.env+')');

## flash.html
<!DOCTYPE html>
<html>
<head>
    <meta charset="utf-8">
    <title>Flash test</title>
    <link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/normalize/3.0.2/normalize.min.css">
</head>
<body>

<h1>Flash test</h1>

{{#if flashmsg}}<p>Flash message: {{flashmsg}}</p>{{/if}}

<form method="post">
    <button type="submit">Submit</button>
</form>

</body>
</html>

## package.json
{
  "main": "app.js",
  "scripts": {
    "start": "nodemon --harmony -e js,json,html app.js"
  },
  "dependencies": {
    "koa": "^0.17.0",
    "koa-flash": "^0.1.0",
    "koa-handlebars": "^0.5.0",
    "koa-router": "^3.8.0",
    "koa-session": "^3.1.0"
  }
}
	var koa = require('koa');
	var session = require('koa-session');
	var flash = require('koa-flash');
	var router = require('koa-router');
	var handlebars = require("koa-handlebars");

	var app = koa();

	app.keys = ['foo'];
	app.use(session({ domain: '.localhost' }, app)); // THIS FAILS
	//app.use(session(app)); // THIS WORKS
	app.use(flash());

	app.use(handlebars({ extension: ['html'], viewsDir: './', partialsDir: './' }));

	app.use(router(app));

	var handler = {};

	handler.get = function*() {
	var context = {};
	if (this.flash) context.flashmsg = this.flash.flashmsg;
	console.log('handler.get flash', this.flash);
	yield this.render('flash', context);
	};

	handler.post = function*() {
	this.flash = { flashmsg: 'This is a flash' };
	console.log('handler.post flash', this.flash);
	this.redirect(this.url);
	};

	var routes = function(app) {
	app.get('/flash', handler.get);
	app.post('/flash', handler.post);
	};
	routes(app);

	app.listen(process.env.PORT\|\|3000);
	console.log(process.version+' listening on port '+(process.env.PORT\|\|3000)+' ('+app.env+')');
	<!DOCTYPE html>
	<html>
	<head>
	<meta charset="utf-8">
	<title>Flash test</title>
	<link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/normalize/3.0.2/normalize.min.css">
	</head>
	<body>

	<h1>Flash test</h1>

	{{#if flashmsg}}<p>Flash message: {{flashmsg}}</p>{{/if}}

	<form method="post">
	<button type="submit">Submit</button>
	</form>

	</body>
	</html>
	{
	"main": "app.js",
	"scripts": {
	"start": "nodemon --harmony -e js,json,html app.js"
	},
	"dependencies": {
	"koa": "^0.17.0",
	"koa-flash": "^0.1.0",
	"koa-handlebars": "^0.5.0",
	"koa-router": "^3.8.0",
	"koa-session": "^3.1.0"
	}
	}