This server is excellent under many circumstances.
But when, as part of the request handling, we need to wait for 'something else' to happen, I see some odd behaviour.

e.g. request arrives and we need to fetch some data before responding:

get('/my-stuff', (res, req) => {   db.query('select * from some_table', (err, reply) => {        res.end(reply)})

or request arrives and we need to call out to an external service in order to satisfy it:

get('/auth/twitter', (res, req) => {   twitterOauth.getRequestToken( (err, token, tokenSecret, results) => {        if (err) {            res.end('oops - we could not fetch a token for you')        } else {             res.end('append this token to your url')       }    })})

At this point the server reports: "Error: Returning from a request handler without responding or attaching an abort handler is forbidden!"

That's pretty interesting. Any ideas how to fix? (nb this may well be 'me' being supremely dopey!)