So basically i have a route in express. If the user is logged in or they are verified redirect me to the dashboard if i am on the login page else stay where i am in the login page.

function checkGuest(req,res,next) {
  let token = req.cookies['session-token'];
  async function verify() {
    const ticket = await client.verifyIdToken({
      idToken: token,
      audience: CLIENT_ID
    })
  }
  verify()
  .then(() => {
    res.redirect('/dashboard') //if the user is logged in go to dashboard
    next();
  })
  .catch(err => {
    next(); //else stay where you are
  }) 
}

<iframe name="sif1" sandbox="allow-forms allow-modals allow-scripts" frameborder="0"></iframe>

And here's how i am using it in my route:

router.get('/',checkGuest,(req,res) => {
    res.render('login',{
        layout: 'login'
    })
})

<iframe name="sif2" sandbox="allow-forms allow-modals allow-scripts" frameborder="0"></iframe>

This is the error Error [ERR_HTTP_HEADERS_SENT] cannot send headers after they are sent back to the client

Hope you understood it.

Your suggestions and quick replies are appreciated

CodePudding user response：

Please return your response. You are not returning the response that's why the header moves to the next line.

function checkGuest(req,res,next) {
  let token = req.cookies['session-token'];
  async function verify() {
    const ticket = await client.verifyIdToken({
      idToken: token,
      audience: CLIENT_ID
    })
  }
  verify()
  .then(() => {
    return res.redirect('/dashboard') //if the user is logged in go to dashboard
  })
  .catch(err => {
    next(); //else stay where you are
  }) 
}

router.get('/',checkGuest,(req,res) => {
    return res.render('login',{
        layout: 'login'
    })
})