Can't set headers after they are sent?

Question

Express.js

Good day!
there is a piece of code

app.post 'auth', (req, res, next) ->
    if app.locals.auth
        res.redirect '/'
        do next

And the combination of res.redirect '/' and do next gives an error
. What can I do?
thanks in advance

Answer 1

If you do a redirect, then next is no longer needed. Middleware chains are worth it, that you need to transfer further only if the request has not yet been processed.