Redirect all requests using Express 3?

express, node.js, node.js-connect

Solution

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')));

Problem

What is the best way to do this? I'd like to redirect all requests from `www.example.com` to `example.com` `*.example.com` to `example.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.

Original source