Redirect all requests using Express 3? - node.js

Question

What is the best way to do this?
I'd like to redirect all requests from www.mysite.com to mysite.com
*.mysite.com to mysite.com would be ideal
I would think some type of middleware. I still hate this, because it seems so inelegant and slightly wasteful, but I think my only option is to do this server-side.

Answer 1

Since Express 3 doesn't use its own HTTP server (instead you pass your app to http.createServer), it doesn't know what port it's running on unless you tell it. That said, you can do basically what you want to do with the following:
app.use(function(request, response, next) {
var newHost = request.host.replace(/^www\./, '');
if (request.host != newHost) {
// 301 is a "Moved Permanently" redirect.
response.redirect(301, request.protocol + "://" + newHost + request.url);
} else {
next();
}
});
You could export this in a module and wrap it in a generator that takes a port:
// no_www.js
module.exports = function(port) {
app.use(function(request, response, next) {
var newHost = request.host.replace(/^www\./, '');
if (request.host != newHost) {
var portStr = '';
if (request.protocol == 'http' && port != 80) portStr = ':' + port;
if (request.protocol == 'https' && port != 443) portSt r= ':' + port;
// 301 is a "Moved Permanently" redirect.
response.redirect(301, request.protocol + "://" + newHost + portStr + request.url);
} else {
next();
}
});
}
// app.js
var noWww = require('./no_www');
var app = express();
app.configure("development", function() {
app.set("port", 3000);
});
...
app.use(noWww(app.get('port')));