Oh god, that actually solved it! Thank you very much! I thought I was going crazy :D

Hey, still no answer to my issue. If anyone out there has any idea, I'd be really grateful.

Thanks! :)

I am trying to add a POST route to my express app which is also using Colyseus.
Here is a demo code:

const app = express();

// This should add POST in the Allow request headers
app.use(cors());
app.options('*', cors());

// This is the Colyseus implementation
const gameServer = new Server({
server: createServer(app)
});

app.post('/signup', function (req, res) {
console.log(req.body);
console.log(res);
res.end();
})

When I make a POST request using Postman I receive error 405: Method not allowed
In the headers I see this:
Allow →GET, HEAD, OPTIONS

So it seems that POST does not work... When I remove Colyseus and only use the app, the POST requests work.

Any idea how to fix this, I'd be really grateful.