Is it possible to generate subdomains on nodejs?

Question

Node.js

Is it possible to generate subdomains on nodejs with content rendering?
Is it possible to implement this structure on nodejs:
1. The user accesses 'subdomian.domian.com';
2. Nodejs takes templated html, inserts data according to the domain;
3. Generates and renders a rendered page to the user.

How difficult is it? And is it worth neglecting this method?

Answer 1

I would use nginx before nodejs.
We listen to domains and all its subdomains and pass an additional header to the node

server {
    listen          *:80;
    server_name     domian.com   *.domian.com;

    set $subdomain "";
    if ($host ~ ^(.*)\.domian\.com$) {
        set $subdomain $1;
    }

    location / {
        proxy_pass          http://127.0.0.1:3000;
        proxy_set_header    X-Subdomain     $subdomain;
    }
}

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

app.get('/', function(req, res) {
    // здесь что-то делаем с этим заголовком
    res.end('Subdomain: ' + req.headers['x-subdomain']);
});

app.listen(3000);