Express migrating from 3.x to 4.x

.gitignore

@@ -14,3 +14,4 @@ results
 npm-debug.log
 node_modules
 .c9
+_cache

app.js

@@ -1,53 +1,79 @@
-var express = require('express'),
-    engine = require('ejs-locals'),
-    utils = require('./utils'),
-    app = express();
+/* import middleware and components dependencies */
+var express = require('express');
+var engine = require('ejs-locals');
+var bodyParser = require('body-parser');
+var compress = require('compression');
+var Cache = require("static-cache") //notice first letter capitalized
+var methodOverride = require('method-override');
+var cookieParser = require('cookie-parser');
+var cookieSession = require('cookie-session');
+var errorHandler = require('errorhandler');
 
+var cache = new Cache({path: __dirname+"/_cache", maxAge: 1000*60*60*24}); // maxAge := one day
+var utils = require('./utils');
+var app = express();
+
+/* function exported */
 exports.init = function(port) {
-
-    app.locals({
-        _layoutFile:'layout.ejs',
-        title:"Bootstrap Zero - Free Bootstrap Themes and Templates",
-        /*desc:"Bootstrap Zero is a collection of open source, free Bootstrap themes and templates. Bootstrap designers and developers can use these free templates to kickstart responsive Web development projects.",*/
-        desc:"Bootstrap themes and templates curated in one totally free, high-quality collection. Bootstrap designers and developers can use these free templates and themes to kickstart Responsive Web Design projects.",
-        keywords:"bootstrap, themes, templates, bootstrap templates, twitter bootstrap, free, responsive, open source",
-        path:"",
-        utils:utils
-    });
-
-    app.configure(function(){
-        app.set('views', __dirname + '/views');
-        app.set('view engine', 'ejs');
-
-        app.use(express.compress());
-        app.use(express.staticCache());
-        app.use(express.static(__dirname + '/static', {maxAge: 86400000}));
-
-        app.use(express.bodyParser());
-        app.use(express.methodOverride());
-        app.use(express.cookieParser());
-        app.use(express.cookieSession({cookie:{path:'/',httpOnly:true,maxAge:null},secret:'skeletor'}));
-
-        app.use(app.router);
-    });
-
-    app.engine('ejs', engine);
-
-    app.configure('development', function(){
-        app.use(express.errorHandler({ dumpExceptions: true, showStack: true })); 
-        // app.use(express.logger({ format: ':method :url' }));
-    });
-
-    app.configure('production', function(){
-        app.use(express.errorHandler()); 
-    })
-
-    app.use(function(err, req, res, next){
-        res.render('500.ejs', { locals: { error: err },status: 500 });	
-    });
+
+	/* application scope variables declared here */
+	app.locals._layoutFile = 'layout.ejs';
+	app.locals.title = "Bootstrap Zero - Free Bootstrap Themes and Templates";
+	/*desc:"Bootstrap Zero is a collection of open source, free Bootstrap themes and templates. Bootstrap designers and developers can use these free templates to kickstart responsive Web development projects.",*/
+	app.locals.desc = "Bootstrap themes and templates curated in one totally free, high-quality collection. Bootstrap designers and developers can use these free templates and themes to kickstart Responsive Web Design projects.";
+	app.locals.keywords = "bootstrap, themes, templates, bootstrap templates, twitter bootstrap, free, responsive, open source";
+	app.locals.path = "";
+	app.locals.utils = utils;
+
+	/* If name is one of the application settings,
+	 * it affects the behavior of the application.
+	 */
+	app.set('views', __dirname + '/views');
+	app.set('view engine', 'ejs');
 
-    var server = app.listen(port);
-    console.log("Listening on port %d in %s mode", server.address().port, app.settings.env);
-    return app;
-
+	/* plug into middleware stack */
+	app.use(express.static(__dirname + '/static', { // let express host static resources 
+		maxAge : 86400000
+	}));
+	app.use(compress());
+	app.use(cache.serve);
+	app.use(bodyParser());
+	app.use(methodOverride());
+	app.use(cookieParser());
+	app.use(cookieSession({
+		cookie : {
+			path : '/',
+			httpOnly : true,
+			maxAge : null
+		},
+		secret : 'skeletor'
+	}));
+
+	app.engine('ejs', engine);
+
+	if ('development' == app.get('env')) {
+		app.use(errorHandler({
+			dumpExceptions : true,
+			showStack : true
+		}));
+	}
+
+	if ('production' == app.get('env')) {
+		app.use(errorHandler());
+	}
+
+	app.use(function(err, req, res, next) {
+		res.render('500.ejs', {
+			locals : {
+				error : err
+			},
+			status : 500
+		});
+	});
+
+	var server = app.listen(port);
+	console.log("Listening on port %d in %s mode", server.address().port,
+			app.settings.env);
+	return app;
+
 }