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I think the simplest thing is to do the following :

• Use Nginx to forward all *.logos.com requests to your Node.js app.
• Then use express.vhost to handle requests appropriately.

Sample Code using Express vHost :

var http = require('http')
var vhost = require('vhost')

// create main app
var app = connect()

app.use(vhost('mail.example.com', function (req, res) {
  // handle req + res belonging to mail.example.com
  res.setHeader('Content-Type', 'text/plain')
  res.end('hello from mail!')
}))

// an external api server in any framework
var httpServer = http.createServer(function (req, res) {
  res.setHeader('Content-Type', 'text/plain')
  res.end('hello from the api!')
})

app.use(vhost('api.example.com', function (req, res) {
  // handle req + res belonging to api.example.com
  // pass the request to a standard Node.js HTTP server
  httpServer.emit('request', req, res)
}))

app.listen(3000);