next-session showing "API resolved without sending a response" log message every request

[stokescomp]

I installed next-session
Then I make a file in api/withsession.js

import { withSession } from 'next-session';
 
const handler = (req, res) => {
  req.session.views = req.session.views ? (req.session.views + 1) : 1;
  res.send(`In this session, you have visited this website ${req.session.views} time(s).`)
};
export default withSession(handler);

It shows this message every time I visit this page in the logs.
API resolved without sending a response for /api/withsession, this may result in a stalled requests.

[hoangvvo]

This was due to vercel/next.js#9999.

It is just a harmless warning and should not cause any actual error in production because the way next-session in written. I will soon update the package to avoid this warning.

[hoangvvo]

Refer to README. Feel free to reopen this for discussion.