Using app.configure in express

I found some code where they set up Express without using `app.configure` and I was wondering, what's the difference between using `app.configure` without an environment specifier and not using it?

In other words, what's the difference between this:

var app = require(express);

app.configure(function(){
app.set('port', process.env.PORT || config.port);
app.use(express.logger('dev')); /* 'default', 'short', 'tiny', 'dev' */
app.use(express.bodyParser());
app.use(express.static(path.join(__dirname, 'site')));
}

and this:

var app = require(express);

app.set('port', process.env.PORT || config.port);
app.use(express.logger('dev')); /* 'default', 'short', 'tiny', 'dev' */
app.use(express.bodyParser());
app.use(express.static(path.join(__dirname, 'site')));

Thanks.

It is optional and remain for legacy reason, according to the doc.
In your example, the two piece of codes have no difference at all.

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**Update 2015:**

@IlanFrumer points out that app.configure is removed in Express 4.x. If you followed some outdated tutorials and wondering why it didn't work, You should remove `app.configure(function(){ ... }`. Like this:


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

app.use(...);
app.use(...);

app.get('/', function (req, res) {
...
});