I have some basic authentication in a route that when used is throwing a console error.
Error: Can't set headers after they are sent.
at ServerResponse.OutgoingMessage.setHeader (_http_outgoing.js:356:11)
at ServerResponse.header
It only occurs when the "if" statement is true (the code within the if statement runs). When that doesn't run, I am not getting any error and the "home" view renders without error.
routes.get('/scan', (req, res, next) => {
const orderID = req.query.order;
const token = req.query.token;
if (!hasAccess(token))
res.status(401).send('Unauthorized');
res.render('home', {order});
});
This error is thrown when you try to respond more than one time to your request.
To avoid this kind of error, you should return when sending a response, so the function will not continue.
In your case :
routes.get('/scan', (req, res, next) => {
const orderID = req.query.order;
const token = req.query.token;
if( !hasAccess( token ) )
return res.status(401).send('Unauthorized');
return res.render('home', {order});
});
You should add a return; after your res.status(401).send('Unauthorized'); to avoid sending a duplicate response.